Composite molded body and method for producing the same

Abstract

To provide a composite molded body with excellent sealing properties and a method for producing the same.SOLUTION: A composite molded body is formed by joining a first member to a second member made of a different material from the first member and covering at least a portion of an outer surface of the first member around the entire circumference. Two or more linear grooves extending in parallel with each other in plan view are formed on at least a portion of a joint between the outer surface of the first member and the second member, and a ratio B / P of a pitch P, which is a distance between centers of adjacent two or more linear grooves, to an unprocessed width B, which is the width between adjacent two or more linear grooves, is 0.33 or greater.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present disclosure relates to a composite compact and a method for producing the same. [Background technology]

[0002] In the manufacture of composite molded products consisting of a first member such as a metal and a second member such as a resin, a technique is known in which the surface of the first member is roughened and then molded integrally with a different material to increase the bonding strength between the first and second members. During molding, the different material penetrates into the voids formed by the roughening, creating an anchor effect that increases the bonding strength. Patent document 1 describes a method for roughening the surface of a metal molded body, in which the surface of the metal molded body is roughened by continuously irradiating the surface with laser light using a continuous wave laser at an irradiation speed of 2000 mm / sec or more. After carrying out the surface roughening method of Patent Document 1, a composite molded body is obtained by bonding it to a resin molded body, and the metal molded body and the resin molded body are bonded with high bonding strength (Patent Document 2). Patent Document 3 describes that in a metal material having a joint with a dissimilar material, in order to increase the degree of joining between the dissimilar materials, the joint is subjected to laser scanning processing in a certain scanning direction, and then laser scanning processing is performed in another scanning direction that intersects the aforementioned scanning direction. Patent Document 4 describes a seal structure for a metal composite joined body in which a metal member and a dissimilar member made of a different material with different physical properties from the metal member are joined together, and the metal member and the dissimilar member have a facing joint interface between the metal member and the dissimilar member. The seal structure for the metal composite joined body is characterized in that a plurality of airtightness-retaining grooves are formed on the surface of the metal member in a direction intersecting the direction in which airtightness is required at the joint interface, and the metal member and the dissimilar member are fusion-joined to provide airtightness at the joint interface. Figure 3(b) of Patent Document 4 shows the surface roughness of an aluminum alloy material 2a after laser processing, showing that the reference surface of the aluminum alloy material 2a has airtightness-retaining grooves with a maximum valley depth Rv of 15 to 20 μm. The arithmetic mean roughness Ra of the line calculated from Figure 3(b) is approximately 6.8 μm. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-142943 [Patent Document 2] Japanese Patent Application Laid-Open No. 2015-142960 [Patent Document 3] International Publication No. 2007 / 072603 [Patent Document 4] Japanese Patent Application Laid-Open No. 2011-240685 Summary of the Invention [Problem to be solved by the invention]

[0004] An object of the present disclosure is to provide a composite molded body with excellent sealing properties and a method for producing the same. [Means for solving the problem]

[0005] The present disclosure encompasses the following aspects. [First embodiment] A composite molded body in which a first member and a second member made of different materials from the first member and covering at least a portion of an outer surface of the first member over the entire periphery are joined together, two or more linear grooves extending parallel to each other in a plan view are formed in at least a part of a joint portion between the outer surface of the first member and the second member, A composite molding, in which the ratio B / P of the pitch P, which is the distance between the centers of adjacent two or more linear grooves, to the unprocessed width B, which is the width between adjacent two or more linear grooves, is 0.33 or more. [Second embodiment] A method for manufacturing a composite molded body in which a first member and a second member made of a different material from the first member and covering at least a portion of an outer surface of the first member over an entire periphery are joined, forming two or more linear grooves extending parallel to each other in a plan view in at least a part of a joint portion between the outer surface of the first member and the second member; A manufacturing method in which the ratio B / P of the pitch P, which is the distance between the centers of adjacent two or more linear grooves, to the unprocessed width B, which is the width between adjacent two or more linear grooves, is 0.33 or more. [Effects of the Invention]

[0006] According to the present disclosure, it is possible to provide a composite molded body with excellent sealing properties and a method for producing the same. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1(a) is a schematic perspective view of a composite molded body of the first embodiment, and FIG. 1(b) is a schematic perspective view of a first member 10 in FIG. 1(a). [Figure 2] 2 is a schematic plan view illustrating two or more linear grooves 40 in the composite molded body of the first embodiment. FIG. [Figure 3]FIG. 3(a) is a diagram showing the process of forming two or more linear grooves 40 by laser light on one surface of the joint in Examples 1 and 2 and Comparative Example 1, and FIG. 3(b) is an explanatory diagram showing the process of rotating the first member in FIG. 3(a) and forming two or more linear grooves 40 by laser light on the joint on another surface of the first member. [Figure 4] 1 is a photograph showing the pitch P and untreated width B at the joint on the outer surface of the first member constituting the composite molded body of Example 1. [Figure 5] 10 is a photograph showing the pitch P and untreated width B at the joint on the outer surface of the first member constituting the composite molded body of Example 2. [Figure 6] 1 is a photograph showing the pitch P and untreated width B at the joint on the outer surface of the first member that constitutes the composite molding of Comparative Example 1. [Figure 7] 1 is an SEM photograph of a cross section in the thickness direction of the composite molded body of Example 1. [Figure 8] 1 is an SEM photograph of a cross section in the thickness direction of a composite molded body of Example 2. [Figure 9] 1 is an SEM photograph of a cross section in the thickness direction of a composite molded body of Comparative Example 1. [Figure 10] 1 is an SEM photograph of a cross section in the thickness direction of a composite molded body of Comparative Example 2. [Figure 11] FIG. 1 is a schematic diagram of a jig for a water immersion test. DETAILED DESCRIPTION OF THE INVENTION

[0008] An embodiment of the present disclosure will be described in detail below. However, the scope of the present disclosure is not limited to the embodiment described herein, and various modifications can be made without departing from the spirit of the present disclosure. Each aspect disclosed in this specification can be combined with any other feature disclosed in this specification. Furthermore, when multiple upper and lower limit values ​​are described for a specific parameter, any of these upper and lower limit values ​​can be combined to form a suitable numerical range. Furthermore, the lower and / or upper limit values ​​of a numerical range described in this disclosure are numerical values ​​within that numerical range and may be replaced with numerical values ​​shown in the examples. The expression "X to Y" indicating a numerical range means "X or more and Y or less." If a specific description described for one embodiment also applies to other embodiments, that description may be omitted in other embodiments. The configurations and combinations thereof in each embodiment are merely examples, and additions, omissions, substitutions, and other modifications of the configurations are possible as appropriate within the scope of the present disclosure. The present disclosure is not limited by the embodiments, but is limited only by the claims. Each feature disclosed herein may be combined with any other feature disclosed herein.

[0009] [First embodiment: composite molding] A first embodiment of the present disclosure is a composite molded body in which a first member and a second member made of a different material from the first member and covering at least a portion of an outer surface of the first member over the entire periphery are joined together, two or more linear grooves extending parallel to each other in a plan view are formed in at least a part of a joint portion between the outer surface of the first member and the second member, The present invention relates to a composite molded body having a ratio B / P of 0.33 or more between a pitch P, which is the distance between the centers of adjacent two or more linear grooves, and an unprocessed width B, which is the width between adjacent two or more linear grooves. The first embodiment can provide a composite molded body having excellent sealing properties. In this specification, "sealability" means the ability to prevent a sealed liquid and / or gas from leaking to the outside and / or the ability to prevent a liquid and / or gas from flowing into the inside when pressurized from the outside, and has the same meaning as airtightness, watertightness, and liquidtightness. In order to improve the sealing performance of a composite molded body in which a first member and a second member are bonded, the first thing that comes to mind is to further increase the bonding strength by the anchor effect and to bond more firmly. In this case, in order to roughen the surface of the first member by processing, it is known to form grooves in a grid pattern by crossing the scanning direction of the laser scanning process, as described in Patent Document 3, for example. The inventors have conducted extensive research and found that, from the perspective of improving the sealing properties of a composite molded body, rather than roughening the surface of the first member by, for example, forming grooves in a grid pattern, it is possible to provide a composite molded body with superior sealing properties through a simpler process that does not roughen the surface too much, by forming two or more linear grooves that extend parallel to each other in a planar view on at least a portion of the flat or curved surface that is the joint between the outer surface of the first member and the second member, and by making the ratio B / P of the pitch P, which is the distance between the centers of adjacent two or more linear grooves, to the unprocessed width B, which is the width between adjacent two or more linear grooves, 0.33 or more. A non-limiting reason for this effect is thought to be that the width of the flat or curved surface (the convex portion when the groove is a concave portion) between the grooves on the first member and the width of the groove fall within a suitable range in which stress is less likely to concentrate on a portion of the second member formed on the first member, thereby further improving adhesion between the first member and the second member. Because the grooves are shaped as two or more straight lines extending parallel to each other in a planar view on the flat or curved surface that is the joint, it is easy to control the direction in which the grooves extend, making it easy to obtain a composite molded product with excellent sealing properties. Because there is no need to cross the scanning direction of the laser scanning process to process it into a grid pattern, a composite molded product can be produced in a shorter time.

[0010] In this specification, the term "first member" refers to a member made of a material having a certain fixed shape, and there are no restrictions on the shape or thickness. Details will be described later. In this specification, the term "dissimilar material" refers to a material that is different from the first member, and in this case, particularly a material that can be bonded to the first member. For example, it is not limited to materials of different categories, such as copper as the first member and polyethylene as the dissimilar material; for example, copper and aluminum, and polyethylene and polypropylene, which are both metals, are also "dissimilar materials" in this specification. Details will be described later. In this specification, a "second member" is a member that includes the above-mentioned "different material" (preferably, is made of the "different material"), and is joined to a first member, and covers at least a portion of the outer surface of the first member all around, and there are no restrictions on its shape or thickness. In this specification, "over the entire circumference" means going all the way around the object, and includes not only two or more linear grooves going all the way around the object (e.g., Figures 2(b) and (e)), but also an area where two or more linear grooves are formed going all the way around the object (e.g., Figures 2(a), (c), (d), (f)). In this specification, "linear groove" refers to a linear recess in a plan view, for example, a linear groove on the flat or curved surface of a flat or curved joint. A "linear groove" is a line that is not curved and may be partially bent, but from the viewpoint of more easily obtaining a composite molded body with excellent sealing properties by controlling the direction of extension of the groove, it is preferable that the linear groove is linear and extends straight over the entire length. The linear groove may be formed in at least a part of the joint, or may be formed over the entire area. Specific examples of the formation of linear grooves will be described later with reference to FIG. 2.

[0011] <The ratio B / P of the pitch P, which is the distance between the centers of adjacent grooves, to the unprocessed width B, which is the width between two or more adjacent linear grooves> In this embodiment, two or more linear grooves extending parallel to each other are formed on a flat or curved surface that is the joint between the outer surface of the first member and the second member, and the ratio B / P of the pitch P, which is the distance between the centers of adjacent grooves, to the unprocessed width B, which is the width between adjacent two or more linear grooves, is 0.33 or more. In this specification, "parallel to each other" does not only mean completely parallel, but also includes parallelism to the extent that it is recognized as being roughly parallel when a first member having two or more linear grooves formed thereon is visually observed.

[0012] In this specification, "the pitch P, which is the distance between the centers of two or more adjacent linear grooves," refers to the arithmetic mean value of the distance between the centers of adjacent grooves among the two or more linear grooves, or the distance between the right ends or the left ends of each groove, measured at four or more locations (particularly ten locations). The distance between the centers of the grooves and the distance between the right or left ends of each groove usually coincide. The pitch P can be measured using conventionally known image processing software. For example, in a cross-sectional photograph of a composite molding, the pitch is the linear distance between the right side of the opening of a groove and the right side of the opening of the adjacent groove on a reference surface (untreated surface), and the arithmetic average value of measurements at four or more locations (particularly ten locations) can be taken as the pitch P. Generally, when forming two or more linear grooves, processing is performed so that the distance between the centers of adjacent grooves is the desired distance. Therefore, the desired distance set in the laser irradiation device during processing and the pitch P, which is the arithmetic average value of the actual measurements, usually coincide with each other. Therefore, the distance set in the laser irradiation device and the pitch P can be considered to be the same. In this specification, the "unprocessed width B, which is the width between adjacent grooves" refers to the arithmetic mean value of the distance between the opposing ends of adjacent grooves measured at five locations. The unprocessed width B can be measured using conventionally known image processing software. Even if the surface of the first member is subjected to a surface treatment such as plating in addition to the formation of grooves, the pitch P and untreated width B are calculated from the values ​​actually measured as described above after the surface treatment.

[0013] In one embodiment, the ratio B / P of the pitch P, which is the distance between the centers of adjacent grooves, to the unprocessed width B, which is the width between adjacent grooves (i.e., the width of the convex portion between grooves, or the distance between the opposing ends of adjacent grooves), is preferably 0.33 to 0.99, more preferably 0.39 to 0.65, even more preferably 0.43 to 0.56, and particularly preferably 0.46 to 0.51.

[0014] Fig. 1(a) shows an example of a composite molded body according to the first embodiment, and Fig. 1(b) is a diagram showing a first member 10 in Fig. 1(a). As shown in Figure 1(a), the composite molding 1 of the first embodiment is formed by joining a first member 10 shown in Figure 1(b) to a second member 20 made of a different material from the first member and covering at least a portion of the outer surface of the first member 10 around the entire circumference. The area surrounded by the dashed line in Figure 1(b) is the joint 30 on the outer surface of the first member 10 where it joins with the second member 20. In the first member 10 shown in Figure 1(b), two or more linear grooves 40, indicated by dashed lines, are formed at the joint 30 on the outer surface of the first member 10 where it joins with the second member 20, with a B / P ratio of 0.33 or more. 1(b), the two or more linear grooves 40 are formed so as to be parallel to the direction in which the end of the joint 30 (the portion indicated by the dashed dotted line) extends, but the direction on the first member 10 is not limited. The two or more linear grooves 40 are formed, for example, by a mechanical processing method such as cutting, an electrical processing method such as electric discharge machining, a chemical processing method such as etching, or a high-energy processing method such as laser processing.

[0015] 1(b) has a rectangular shape, the shape of the first member 10 is not limited thereto and may have, for example, one or more shapes selected from a cylindrical shape, a columnar shape, a rectangular tube shape, a prism shape, and a rectangular shape. When the first member 10 is cylindrical or columnar, the joint 30 may have a curved surface. When the first member 10 is rectangular tube shape, a prism shape, or a rectangular shape, the joint 30 may have a flat surface. 1(a), the second member 20 has a rectangular parallelepiped shape having protrusions around its entire periphery for installation on a jig for a water immersion test and a helium leak test, which will be described later, but the shape is not limited as long as it is joined to the first member 10 and covers at least a portion of the outer surface of the first member 10 all around. Through-holes, protrusions, depressions, etc. may be formed by machining in the portions of the first member 10 where the second member 20 is not formed.

[0016] FIG. 2 is a diagram illustrating, without limitation, two or more linear grooves 40 in the composite molded body of the first embodiment, and is a horizontal plan view of the composite molded body 1 of the first embodiment as viewed from directly above. In (a) to (f) of FIG. 2, two or more linear grooves 40 are formed with a B / P ratio of 0.33 or more in at least a portion of the joint 30 (the portion sandwiched between the dashed lines) on the outer surface of the first member 10. In this embodiment, the two or more linear grooves 40 may be formed with a B / P ratio of 0.33 or more, and the direction of the two or more linear grooves 40 relative to the first member 10 is not limited, and they may overlap the end of the joint 30 (the portion indicated by the dashed lines). Furthermore, the two or more linear grooves 40 may be formed in two or more locations, as shown in (a) and (c) of FIG. 2.

[0017] In one embodiment, it is preferable that none of the two or more linear grooves penetrates the joint. By not having any of the two or more linear grooves penetrate the joint, the composite molded body of this embodiment has better sealing properties. As used herein, "not penetrating the joint" means that none of the two or more linear grooves are connected to both ends of the joint. In other words, none of the two or more linear grooves are connected in a continuous manner from one end to the other end of the joint. That is, there is no groove on the outer surface of the first member that extends continuously from one end of the joint to the other end and connects both ends of the joint. In (a) to (f) of FIG. 2, none of the two or more linear grooves are connected to both ends of the joint 30, and therefore none of the two or more linear grooves penetrate the joint. Note that in FIGS. 2(a) and (c), each groove extends beyond the joint, while in FIG. 2(b), some of the two or more linear grooves extend beyond the joint. However, in FIGS. 2(a) to 2(c), none of the grooves connects one end of the joint to the other end (that is, it does not penetrate the joint). 2(g), the linear grooves are connected in a continuous series from one end of the joint to the other end, penetrating the joint. A non-limiting reason why such a configuration enhances sealing performance is that, in a composite molded product in which at least a portion of the outer peripheral surface of the first component is entirely covered with the second component, a path (also referred to herein as a "leak path") through which liquid and / or gas leaks (also referred to herein as a "leak") is likely to occur in a direction away from the outer peripheral surface of the first component where the second component is not formed. However, because none of the two or more linear grooves penetrate the joint, leak paths are less likely to occur, which is thought to result in enhanced sealing performance.

[0018] In Figure 1(a), the long dashed two-dot line X indicates the direction of the shortest leak path when a leak occurs. As described above, in a composite molded product in which a first member and a second member that covers at least a portion of the entire outer surface of the first member are joined, a leak path is structurally likely to occur in a direction that is not covered by the second member. In this specification, "the direction of the shortest leak path when a leak occurs" means the direction of the shortest straight line connecting the approximate center of the joining surface and the end of the second member on the outer surface of the first member. The angle (θ in FIG. 1(b)) at which the two or more linear grooves intersect with the leak path direction (i.e., long dashed two-dot line X) is not limited, but is preferably 45 to 135°, and more preferably 80 to 100°. In one embodiment, the angle at which the two or more linear grooves intersect with the leak path direction may be 90°±10°.

[0019] In one embodiment, it is preferable that at least one of the two or more linear grooves completely encircle the outer surface of the first member. "Completing a complete circle around the outer surface of the first member" may include a groove that is partially interrupted. For example, if the first member is a rectangular tube, a rectangular column, or a rectangular member, the grooves are formed while the first member is rotated, which may result in some deviation in the position of the grooves formed on each surface. In this case, the grooves on adjacent surfaces may not be connected. In one embodiment, each groove may be continuous (unbroken) and go all the way around the first member. At least one of the two or more linear grooves goes around the outer surface of the first member, which makes it more difficult for leak paths to occur in the entire joint, resulting in better sealing properties.

[0020] <Arithmetic mean height Sa of the joint between the outer surface of the first member and the second member> In one embodiment, the arithmetic mean height Sa of the joint between the outer surface of the first member and the second member is preferably 8 to 150 μm or less, more preferably 10 to 100 μm or less, and even more preferably 15 to 50 μm or less. In this specification, "arithmetic mean height Sa" refers to the average absolute value of the difference in height between each point and the average plane of the surface. Generally, the larger the arithmetic mean height Sa, the greater the number of irregularities with large heights, i.e., the greater the degree of roughening. When the arithmetic mean height Sa is within the above range, the anchor effect caused by the penetration of different materials into the voids on the first member increases the bonding strength between the first member and the second member, making it less likely that leak paths will occur and resulting in better sealing properties. Note that the arithmetic mean height Sa is a parameter obtained by extending the arithmetic mean height Ra of a line to a plane, and is a different parameter from the arithmetic mean height Ra. The arithmetic mean height Sa can be measured in accordance with ISO25178. The arithmetic mean height Sa can be set within the above range by forming one or more (preferably multiple) linear grooves on the joining surface. Since voids that create an anchor effect are likely to form, it is preferable to form two or more linear grooves by irradiating the first member with laser light. In order to set the arithmetic mean height Sa within the above range, other methods besides forming two or more linear grooves may be used on the joining surface, such as mechanical machining methods like cutting, electrical machining methods like electric discharge machining, chemical machining methods like etching, or high-energy machining methods like laser machining.

[0021] In one embodiment, the root mean square slope Sq of the outer surface of the first member at the joint with the second member is preferably 10 to 100 μm or less, more preferably 15 to 50 μm or less, and even more preferably 20 to 40 μm or less. In this specification, the "root mean square slope Sq" is a parameter calculated by taking the root mean square of the slope at all points in the measurement area, and is synonymous with the standard deviation of the height distribution. Generally, the larger the "root mean square slope Sq," the greater the variation in height, i.e., the greater the degree of surface roughness. When the root mean square slope Sq is within the above range, the anchor effect caused by the penetration of the different material into the voids on the first member increases the bonding strength between the first member and the second member, making it less likely that a leak path will occur and resulting in better sealing properties. The root mean square slope Sq can be measured in accordance with ISO25178. The root-mean-square slope Sq can be set within the above range by forming one or more (preferably multiple) linear grooves on the joining surface. Because voids that create an anchor effect are likely to form, two or more linear grooves are preferably formed by irradiating the first member with laser light. In order to set the root-mean-square slope Sq within the above range, other methods besides forming two or more linear grooves may be used to apply a mechanical machining method such as cutting to the joining surface, an electrical machining method such as electric discharge machining, a chemical machining method such as etching, or a high-energy machining method such as laser machining.

[0022] In one embodiment, the depth of the two or more linear grooves is preferably 50 to 800 μm, more preferably 100 to 700 μm, even more preferably 150 to 600 μm, and particularly preferably 200 to 500 μm. When the depth of the two or more linear grooves is within the above range, the anchor effect caused by the second member made of a different material penetrating into the voids on the first member is enhanced, the bonding strength between the first member and the second member is enhanced, leak paths are less likely to occur, and sealing properties are improved.

[0023] In one embodiment, the first member and the second member are preferably directly bonded to each other. Since the composite molded body has the above-described sealing property without the need to infiltrate an adhesive, an impregnating agent, or the like into the interface between the first member and the second member of the composite molded body to improve bonding, the composite molded body can be manufactured with fewer processes and with a smaller environmental impact.

[0024] <Submersion test> In one embodiment, after the composite molded article according to the first embodiment is subjected to the heat cycle described below, it is preferable that no air leakage is confirmed in a water immersion test using compressed air at a pressure of 100 kPa, more preferably at a pressure of 300 kPa, and even more preferably at a pressure of 400 kPa. The method for the water immersion test using compressed air is not limited as long as it can confirm the presence or absence of air leakage after applying a desired pressure using compressed air. For example, the water immersion test can be performed using a water immersion test jig as shown in FIG. 11. The water immersion test jig shown in FIG. 11 has a lid and a pressure member that are screwed together. The composite molded article 1 according to the first embodiment is fixed by sandwiching it between the lid and pressure member, and water is poured above the lid. The pressure member is then pressurized with air. The presence or absence of air leakage can be confirmed by observing the water above the lid for a certain period of time and determining whether or not air bubbles are observed. Since no air leakage was confirmed in the above-mentioned submersion test, the composite molded body in one embodiment has excellent sealing properties.

[0025] <Helium leak test after heat cycle> In one embodiment, the composite molded body according to the first embodiment is subjected to the following heat cycle, and then the leakage amount in a helium leak test under a condition of 100 kPa according to JIS Z 2331 is 5×10 -7 Pa·m 3 / s or less, and the leakage amount in a helium leak test under the condition of 300 kPa according to JIS Z 2331 is 5 × 10 -7 Pa·m 3 / s or less, and the leakage amount in a helium leak test under 500 kPa conditions according to JIS Z 2331 is 5 x 10 -7 Pa·m 3 / s or less is even more preferred. (heat cycle) The composite molded body is heated at 150° C. for 30 minutes, then cooled at −40° C. for 30 minutes, and then returned to room temperature (25° C.), and this cycle is repeated 500 times. Helium gas has a small molecular diameter, so it easily penetrates into leak paths. The helium leak test is a test that can detect minute leaks, so the leak amount in the helium leak test is 5 × 10 -7 Pa·m 3 / s or less means that the seal has very high sealing performance. Even after the above heat cycle, the leakage was 5×10 in the helium leak test. -7 Pa·m 3 It is surprising that the rate is less than / s. After the above heat cycle, the leakage amount in the helium leak test was 5×10 -7 Pa·m 3 / s or less, the sealing performance is excellent even when used for a long period of time in an environment with large temperature changes. Furthermore, as mentioned above, the helium leak test is a test that can detect minute leaks, so the leakage amount in the helium leak test after the heat cycle is 5 × 10 -7 Pa·m 3 / s or less, it is highly likely that no air leakage will be detected even if a water immersion test is carried out under pressure of 400 kPa using compressed air after a heat cycle.

[0026] <First component> In the first embodiment, the "first member" may be anything that has a certain fixed shape. The shape of the first member is not particularly limited and can be appropriately selected depending on the application. In one embodiment, the first member preferably has one or more shapes selected from a cylindrical shape, a columnar shape, a rectangular tube shape, a prism shape, and a rectangular shape. By having the first member have one or more shapes selected from a cylindrical shape, a columnar shape, a rectangular tube shape, a prism shape, and a rectangular shape, the first member can be more suitably used as a member having a first member of a desired shape. In one embodiment, the first member preferably has a bent portion at least in part. By having a bent portion at least in part of the first member, it can be used as a first member having a desired shape. In one embodiment, at least a portion of the outer surface of the first member is preferably plated, which can impart desired properties to the first member, such as reduced contact resistance.

[0027] The material of the first member is not particularly limited, and can be appropriately selected from known materials depending on the application. In one embodiment, the first member may be a conductor. When the first member is a conductor, it can be suitably used in applications where electrical conductivity is required. In one embodiment, when the first member is a conductor, it is preferably a bus bar. Because the composite molded product according to the first embodiment has excellent sealing properties, it can be more suitably used as a bus bar in various devices and equipment that require sealing properties.

[0028] In one embodiment, the first member may be a thermal conductor. When the first member is a thermal conductor, it can be suitably used in applications where thermal conductivity is required. In one embodiment, when the first member is a thermal conductor, it is preferably a heat sink. The composite molded product according to the first embodiment has excellent sealing properties and can therefore be suitably used as a heat sink in various devices and equipment that require sealing properties.

[0029] In one embodiment, the first member may be an insulator. When the first member is an insulator, it can be suitably used in applications where insulation is required. In one embodiment, when the first member is an insulator, the first member is preferably made of ceramics, which may be selected from oxide-based ceramics, nitride-based ceramics, carbide-based ceramics, and the like.

[0030] In one embodiment, the ceramic is preferably a ceramic containing an oxide-based ceramic such as alumina, zirconia, magnesia, silica, titanium oxide, cerium oxide, zinc oxide, tin oxide, uranium oxide, β-alumina, mullite, YAG, forsterite (2MgO·SiO2), barium titanate (BaTiO3), steatite (MgO·SiO2), cordierite (2MgO·2Al2O3·5SiO2), or lead zirconate titanate, and more preferably a ceramic containing alumina or zirconia.

[0031] The alumina may be made of only alumina, or may be made of a composite of alumina with other ceramics or metals.

[0032] The zirconia may be made of zirconia alone or may be made of a composite of zirconia with other ceramics or metals.

[0033] In one embodiment, the ceramic preferably includes a nitride-based ceramic such as aluminum nitride, silicon nitride, titanium nitride, sialon (SiAlON), or titanium carbonitride, and more preferably includes aluminum nitride, silicon nitride, or titanium carbonitride. Aluminum nitride, silicon nitride, and titanium carbonitride may each be formed alone or in a composite of aluminum nitride, silicon nitride, or titanium carbonitride with other nonmagnetic ceramics, metals (e.g., aluminum, copper, magnesium, brass), or semimetals (e.g., silicon). In the case of a composite, the content of the nitride-based ceramic is preferably 50% by mass or more, more preferably 60% by mass or more, and even more preferably 70% by mass or more.

[0034] In one embodiment, the ceramic preferably includes a carbide-based ceramic such as silicon carbide, titanium carbide, tungsten carbide, or boron carbide, and more preferably includes silicon carbide. The silicon carbide may be composed solely of silicon carbide, or may be a composite of silicon carbide with other nonmagnetic ceramics, metals, or metalloids. The composite of silicon carbide and a metal is obtained by impregnating the pores of a porous silicon carbide compact with a metal (e.g., aluminum) or a metalloid (e.g., silicon), and the silicon carbide content is preferably 50% by mass or more. In one embodiment, the first member is preferably a ceramic semiconductor substrate or a ceramic heat sink. Because the composite molded body according to the first embodiment has excellent sealing properties, it can be suitably used as a ceramic-containing member, particularly a ceramic semiconductor substrate or a ceramic heat sink, in various devices and equipment that require sealing properties.

[0035] In one embodiment, the first member preferably includes one or more materials selected from ceramics, copper, copper alloys, aluminum, aluminum alloys, and alloys thereof. By including one or more materials selected from ceramics, copper, copper alloys, aluminum, aluminum alloys, and alloys thereof, the first member has superior electrical conductivity. The above materials may be subjected to a surface treatment such as anodizing or plating. In one embodiment, the first member preferably includes one or more materials selected from ceramics, metals, graphite, and conductive polymers, and the first member has better electrical conductivity by including one or more materials selected from ceramics, metals, graphite, and conductive polymers.

[0036] <Second component> In the first embodiment, the "dissimilar material" is not particularly limited as long as it is a material different from the material constituting the first member and can be bonded to the first member, and can be appropriately selected from known materials bondable to the first member depending on the application. For example, when the second member is made of a thermoplastic resin, examples of the thermoplastic resin include polyamide resins (aliphatic polyamides such as PA6 and PA66, aromatic polyamides), polystyrene, copolymers containing styrene units such as ABS resin and AS resin, polyethylene, copolymers containing ethylene units, polypropylene, copolymers containing propylene units, other polyolefins, polyvinyl chloride, polyvinylidene chloride, polycarbonate resins, acrylic resins, methacrylic resins, polyester resins, polyacetal resins, polyphenylene sulfide resins, PPS (polyphenylene sulfide) resins, polybutylene terephthalate resins, polyimide resins, polyether ether ketone resins, and fluororesins.

[0037] When the second member is made of a thermosetting resin, examples of the thermosetting resin include urea resin, melamine resin, phenol resin, resorcinol resin, epoxy resin, polyurethane, and vinyl urethane.

[0038] When the second component is made of a thermoplastic elastomer, examples of the thermoplastic elastomer include styrene-based elastomers, vinyl chloride-based elastomers, olefin-based elastomers, urethane-based elastomers, polyester-based elastomers, nitrile-based elastomers, and polyamide-based elastomers.

[0039] The above-mentioned thermoplastic resins, thermosetting resins, and thermoplastic elastomers may be blended with known fibrous fillers, such as carbon fibers, inorganic fibers, metal fibers, and organic fibers. Carbon fibers are well known, and PAN-, pitch-, rayon-, and lignin-based fibers can be used. Inorganic fibers include glass fibers, basalt fibers, silica fibers, silica-alumina fibers, zirconia fibers, boron nitride fibers, and silicon nitride fibers. Metal fibers include fibers made of stainless steel, aluminum, and copper. Organic fibers include synthetic fibers such as polyamide fibers (fully aromatic polyamide fibers, semi-aromatic polyamide fibers in which either the diamine or the dicarboxylic acid is an aromatic compound, and aliphatic polyamide fibers), polyvinyl alcohol fibers, acrylic fibers, polyolefin fibers, polyoxymethylene fibers, polytetrafluoroethylene fibers, polyester fibers (including fully aromatic polyester fibers), polyphenylene sulfide fibers, polyimide fibers, and liquid crystal polyester fibers, as well as natural fibers (e.g., cellulose-based fibers) and regenerated cellulose (rayon) fibers. In one embodiment, the second member preferably includes one or more materials selected from a thermoplastic resin, a thermosetting resin, a rubber, and an elastomer. The second member covers at least a portion of the entire outer peripheral surface of the first member, and its shape and thickness are not limited. For example, the thickness of the second member may be 0.1 to 50 mm, or 2 to 25 mm. In one embodiment, when the first member has a rectangular shape, the second member may cover a part or the entire outer peripheral surface extending in the longitudinal direction of the first member. In one embodiment, the second member may cover only a portion of the outer circumferential surface of the first member over the entire periphery, in which case the first member has an area that is completely covered by the second member and an area that is not covered by the second member.

[0040] <Method of manufacturing composite molded body> The method for producing the composite molded body according to the first embodiment is not particularly limited, and it can be prepared by a conventionally known method. The method for forming two or more linear grooves at the joint between the outer surface of the first member and the second member is not particularly limited, and can be, for example, a mechanical processing method such as cutting, an electrical processing method such as electric discharge processing, a chemical processing method such as etching, or a high-energy processing method such as laser processing. The method for joining the first member and a different material to create the composite molded body according to the first embodiment is not particularly limited, and can be carried out by molding methods such as injection molding, extrusion molding, hot press molding, compression molding, transfer molding, laser welding molding, reaction injection molding (RIM molding), rim molding (LIM molding), and thermal spray molding. In one embodiment, the composite molded product according to this embodiment is preferably produced by a method for producing a resin composition according to an embodiment described below.

[0041] [Second embodiment: manufacturing method of composite molded body] A second embodiment of the present disclosure is A method for manufacturing a composite molded body in which a first member and a second member made of a different material from the first member and covering at least a portion of an outer surface of the first member over an entire periphery are joined, forming two or more linear grooves extending parallel to each other in a plan view in at least a part of a joint portion between the outer surface of the first member and the second member; The manufacturing method relates to a method in which the ratio B / P of the pitch P, which is the distance between the centers of the two or more adjacent linear grooves, to the unprocessed width B, which is the width between the two or more adjacent linear grooves, is 0.33 or more. The manufacturing method of the second embodiment can provide a composite molded body with superior sealing properties. The manufacturing method of the composite molded body of the second embodiment can suitably manufacture the composite molded body of the first embodiment. The first member and the second member are as described in the first embodiment. The ratio B / P of the pitch P, which is the distance between the centers of the two or more adjacent linear grooves, to the unprocessed width B, which is the width between the two or more adjacent linear grooves, is as described in the first embodiment.

[0042] As described above, the method for forming two or more linear grooves at the joint between the outer surface of the first member and the second member is not particularly limited, and can be performed by, for example, a mechanical processing method such as cutting, an electrical processing method such as electric discharge processing, a chemical processing method such as etching, or a high-energy processing method such as laser processing.

[0043] Fig. 3(a) illustrates a method for manufacturing a composite molded product according to the second embodiment. As shown in Fig. 3(a), a single linear groove is formed by irradiating a first member 10 with laser light 50. After forming a single linear groove, the laser light 50 is again irradiated in the laser scanning direction from another location along the processing width, thereby forming another linear groove. By repeating this process, two or more linear grooves 40 are formed. 3(b) illustrates a method of machining one surface of the first member 10 shown in FIG. 3(a), and then rotating the first member 10 to machine another surface. In this way, by machining one surface, rotating the first member 10, and machining the other surface, it is possible to machine the first member 10 so that at least one of the two or more linear grooves 40 goes all the way around the outer surface of the first member 10. 3 has a rectangular shape, the shape of the first member 10 is not limited thereto and may have one or more shapes selected from, for example, a cylindrical shape, a columnar shape, a rectangular tube shape, a rectangular pillar shape, and a rectangular shape. For example, in the case of a cylindrical or columnar shape, one linear groove can be formed by irradiating the first member 10 with laser light 50 while moving and rotating the first member 10 without moving the laser light in the scanning direction, and this can be repeated as necessary to form two or more linear grooves 40. After forming the desired two or more linear grooves 40, the first member and a different material can be joined by a molding method such as injection molding, extrusion molding, hot press molding, compression molding, transfer molding, laser welding molding, reaction injection molding (RIM molding), rim molding (LIM molding), or thermal spray molding, to produce the composite molded body of the first embodiment illustrated in Figure 1(a).

[0044] In one embodiment, it is preferable that none of the two or more linear grooves penetrate the joint. By not having any of the two or more linear grooves penetrate the joint, a composite molded body with excellent sealing properties can be obtained by the manufacturing method of this embodiment.

[0045] In one embodiment, forming two or more linear grooves preferably includes irradiating the first member with laser light. By including laser light irradiation, two or more linear grooves can be formed at a faster processing speed than groove formation. In addition, finer voids can be generated in the grooves, making it easier to achieve an anchor effect and more likely to improve sealing properties.

[0046] In one embodiment, the laser light is preferably a continuous wave laser light or a pulse wave laser light. The laser light irradiation can be performed by either a first laser light irradiation method in which two or more linear grooves are formed by irradiating a continuous wave laser light, or a second laser light irradiation method in which two or more linear grooves are formed by irradiating a pulse wave laser light.

[0047] The first laser beam irradiation method can be carried out by continuously irradiating the joining surface of the first member with laser beam using a continuous wave laser so as to form linear or curved grooves. By continuously irradiating the laser beam, linear grooves can be formed in a short time. The first laser light irradiation method can also be carried out in such a way that laser light irradiated portions and non-irradiated portions are alternately generated.

[0048] Laser light energy density (MW / cm 2 ) is the relationship between the laser output (W) and the laser irradiation spot area (π × [spot diameter / 2] 2 ) can be obtained from In one embodiment, the energy density during laser light irradiation is 1 MW / cm 2 Preferably, it is 2 to 1000 MW / cm or more. 2More preferably, it is 10 to 800 MW / cm 2 It is even more preferable that the 2 It is particularly preferred that: In one embodiment, the irradiation speed of the laser light is preferably 2000 mm / sec or more, more preferably 2000 to 20000 mm / sec, even more preferably 2000 to 18000 mm / sec, and particularly preferably 3000 to 15000 mm / sec. In one embodiment, the output of the laser beam is preferably 4 to 4000 W, more preferably 50 to 2500 W, and even more preferably 150 to 2000 W. If other laser beam irradiation conditions are the same, the greater the output, the deeper the grooves will be, and the smaller the output, the shallower the grooves will be. In one embodiment, the wavelength is preferably 500 to 11,000 nm. In one embodiment, the beam diameter (spot diameter) is preferably 5 to 80 μm. In one embodiment, the defocus distance is preferably -5 to +5 mm, more preferably -1 to +1 mm, and even more preferably -0.5 to +0.1 mm. In one embodiment, the laser may be irradiated with a constant defocus distance setting, or the laser may be irradiated while varying the defocus distance. For example, the defocus distance may be gradually decreased during laser irradiation, or may be periodically increased or decreased. If the defocus distance is an appropriate negative (negative) value, the groove depth will be deeper. The depth of the groove can also be adjusted by adjusting the number of repetitions when irradiating with laser light. In one embodiment, the number of repetitions (total number of laser light irradiations to form one groove) is preferably 1 to 30, and more preferably 5 to 20. Under the same laser irradiation conditions, the more the number of repetitions, the deeper the groove, and the fewer the number of repetitions, the shallower the groove.

[0049] The second laser light irradiation method can be carried out by repeatedly irradiating the joining surface of the first member with laser light using a pulsed laser to form linear or curved grooves. By adjusting the pulse width of the pulsed laser, the material of the first member and the width and depth of the grooves can be adjusted.

[0050] A non-limiting list of exemplary embodiments and combinations of exemplary embodiments of the present disclosure are disclosed below. [1] A composite molding in which a first member and a second member made of different materials from the first member and covering at least a portion of the outer surface of the first member over the entire periphery are joined together, two or more linear grooves extending parallel to each other in a plan view are formed in at least a part of a joint portion between the outer surface of the first member and the second member, A composite molding, in which the ratio B / P of the pitch P, which is the distance between the centers of adjacent two or more linear grooves, to the unprocessed width B, which is the width between adjacent two or more linear grooves, is 0.33 or more. [2] The composite molding according to [1], wherein none of the two or more linear grooves penetrates the joint. [3] The composite molding according to [1] or [2], wherein at least one of the two or more linear grooves extends around the outer surface of the first member. [4] The composite molding according to any one of [1] to [3], wherein the arithmetic mean height Sa of the outer surface of the first member at the joint with the second member is 8 to 150 μm. [5] The composite molding according to any one of [1] to [4], wherein the first member and the second member are directly bonded to each other. [6] A composite molding according to any one of [1] to [5], in which no air leakage is confirmed in a water immersion test under a pressure of 400 kPa using compressed air after undergoing the following heat cycle. (heat cycle) The composite molded body is heated at 150° C. for 30 minutes and then cooled at −40° C. for 30 minutes, and this cycle is repeated 500 times. [7] After the following heat cycle, the leakage amount in the helium leak test under the condition of 100 kPa according to JIS Z 2331 is 5 x 10 -7 Pa·m 3 / s or less. (heat cycle) The composite molded body is heated at 150° C. for 30 minutes and then cooled at −40° C. for 30 minutes, and this cycle is repeated 500 times. [8] The composite molding according to any one of [1] to [7], wherein the first member has one or more shapes selected from a cylindrical shape, a columnar shape, a rectangular tube shape, a prismatic shape, and a rectangular shape. [9] The composite molding according to any one of [1] to [8], wherein the first member has a bent portion at least in part.

[10] The composite molding according to any one of [1] to [9], wherein at least a portion of the outer surface of the first member is plated.

[11] The composite molding according to any one of [1] to

[10] , wherein the first member is a conductor.

[12] The composite molding according to any one of [1] to

[11] , wherein the first member is a bus bar.

[13] The composite molding according to any one of [1] to

[12] , wherein the first member is a thermal conductor.

[14] The composite molding according to any one of [1] to

[13] , wherein the first member is a heat sink.

[15] The composite molding according to any one of [1] to

[14] , wherein the first member is an insulator.

[16] The composite molding according to any one of [1] to

[15] , wherein the first member is made of ceramics.

[17] The composite molding according to any one of [1] to

[16] , wherein the first member comprises one or more materials selected from ceramics, copper, copper alloys, aluminum, aluminum alloys, and alloys thereof.

[18] A composite molding according to any one of [1] to

[17] , wherein the first member comprises one or more materials selected from ceramics, metals, graphite, and conductive polymers, and the second member comprises one or more materials selected from thermoplastic resins, thermosetting resins, rubbers, and elastomers.

[19] A method for manufacturing a composite molded body in which a first member and a second member made of different materials from the first member and covering at least a portion of an outer surface of the first member over the entire periphery are joined, forming two or more linear grooves extending parallel to each other in a plan view in at least a part of a joint portion between the outer surface of the first member and the second member; A manufacturing method in which the ratio B / P of the pitch P, which is the distance between the centers of adjacent two or more linear grooves, to the unprocessed width B, which is the width between adjacent two or more linear grooves, is 0.33 or more.

[20] The manufacturing method described in

[19] , wherein none of the two or more linear grooves penetrates the joint.

[21] The manufacturing method according to

[19] or

[20] , wherein forming the two or more linear grooves includes irradiating the first member with laser light.

[22] The manufacturing method according to

[21] , wherein the laser light is a continuous wave laser light or a pulse wave laser light. [Example]

[0051] The present invention will be explained in more detail below by showing examples, but interpretation of the present disclosure is not limited to these examples.

[0052] [Examples 1 and 2, Comparative Examples 1 and 2] As the first member, a rectangular copper plate (C1100) (length 88 mm×width 20 mm×thickness 1.6 mm) having the shape shown in FIG. 1(b) was prepared. In Examples 1 and 2 and Comparative Example 1, the outer surface of the first member at the joint where the second member is to be joined was irradiated with a continuous wave laser beam under the conditions shown below to form two or more linear grooves parallel to the width direction of the first member at the set pitch P shown in Table 1, as shown in Figure 1(b), and three first members were prepared for each example. Each groove extended in a direction intersecting (perpendicular to) the direction of the shortest leak path in the event of a leak (the long two-dot chain line in Figure 1(a)). In the examples, none of the grooves penetrated the joint with the second member. <Conditions for continuous wave laser beam> Processing width: 5mm ·Irradiation speed: 6000mm / sec Energy density: 126MW / cm 2 ·Irradiation form: Bidirectional Spot diameter: 28.4 μm The number of grooves formed in the first member in Examples 1 and 2 and Comparative Example 1 was determined by the ratio of the set pitch (hereinafter also referred to as set pitch P) to the processing width, as follows: Example 1: 5mm / 300μm ≒ 17 pieces Example 2: 5mm / 400μm ≒ 13 pieces Comparative example 1: 5mm / 200μm=25 pieces In the first members of Examples 1 and 2 and Comparative Example 1, as shown in the transition from Fig. 3(a) to Fig. 3(b), each time a linear groove with pitch P was formed in the joint portion of a certain surface, the first member was rotated by 90° to form linear grooves with pitch P in the same manner on all surfaces, thereby forming linear grooves with pitch P in the joint portion of all surfaces of the first member. Note that some positional deviation occurred when each surface was rotated, and some of the linear grooves on each surface were continuously connected to the grooves on the adjacent surface, some were not connected to the grooves on the adjacent surface, and some were connected only to part of the grooves on the adjacent surface.

[0053] Next, a photograph was taken of the joint after irradiation with the continuous wave laser beam. Figures 4 to 6 are photographs of the joining surfaces of the composite molded bodies of Examples 1 and 2 and Comparative Example 1, respectively. The relatively white areas are the untreated portions of the first member, and the relatively black areas are the grooves. Note that some of the untreated portions have fine scratches that existed before processing and scratches caused by the laser light when forming the grooves. The photographs were imported into image processing software (ImageJ), and the untreated width B, which is the distance between the opposing ends of adjacent grooves, was measured at five locations on each image. The average untreated width (untreated width B) was calculated, and the ratio B / P of the untreated width B to the set pitch P was calculated. Furthermore, in SEM photographs (Figures 7 to 9) of the joining surfaces of the composite molded bodies of Examples 1 and 2 and Comparative Example 1 taken in the thickness direction, the pitch was defined as the linear distance between the right side of the opening of one groove and the right side of the opening of the adjacent groove on the reference surface (untreated surface), and the arithmetic mean value of the pitch P measured at these four locations was calculated. The results are shown in Table 1.

[0054] [Arithmetic mean height Sa] The arithmetic mean height Sa and root mean square slope Sq of the joint of each first member of Examples 1 and 2 and Comparative Example 1 were measured using a one-shot 3D shape measuring machine (manufactured by Keyence Corporation). The results are shown in Table 1.

[0055] Three first members of each of the examples and comparative examples were injection molded using the method described below to produce three composite molded bodies each of the examples and comparative examples, each having the same shape as FIG. 1(a), a thickness of 2.1 mm, and a straight resin member having a protrusion around its entire circumference for installation on a jig for the water immersion test and helium leak test, which covered a portion of the longitudinal direction of the first member over the entire circumference. <Injection molding> Resin: Polyphenylene sulfide (PPS) resin containing 35% glass fiber (DURAFIDE 1135MF1, manufactured by Polyplastics Co., Ltd.). Molding machine: Sodick Co., Ltd.: TR100EH Cylinder temperature: 320℃-320℃-320℃-320℃-310℃ Mold temperature (MT): 140℃ Injection delay: 0 seconds - Holding pressure: 50MPa Pressure retention time: 10 seconds ·Cooling time: 25 seconds ·Injection speed: 70mm / s

[0056] 6 to 9 are SEM photographs of the joining surfaces of the composite molded bodies of Examples 1 and 2 and Comparative Examples 1 and 2 in the thickness direction, respectively. The relatively white parts are the copper plates, and the relatively black parts are the resin molded bodies. 6 to 8, grooves were formed in the thickness direction in the composite molded bodies of Examples 1 and 2 and Comparative Example 1. The inside of the grooves appeared black, confirming that resin had penetrated therein.

[0057] The composite molded articles of the examples and comparative examples were evaluated by the following water immersion test, helium leak test, and water immersion test and helium leak test after heat cycle. The results are shown in Table 1. [Submersion test] Three composite molded articles from each of the examples and comparative examples were subjected to a submersion test using the submersion test jig shown in Figure 11. The submersion test jig shown in Figure 11 has a lid and a pressure member that are screwed together, and the composite molded article can be fixed by sandwiching it between the lid and pressure member. After fixing, water was poured above the lid, and the pressure member was pressurized to 200 kPa with air over 10 seconds. After reaching 200 kPa, the water above the lid was observed for 60 seconds, and the presence or absence of air leakage was evaluated based on whether air bubbles were observed in the water. In Table 1, a score of 1 indicates no air leakage, and a score of 2 indicates leakage.

[0058] [Helium leak test] Under the following conditions, a helium leak test was carried out on three composite molded articles each from Examples 1 and 2 and Comparative Example 1. Note that, for the composite molded article from Comparative Example 1, air leakage occurred in the water immersion test, so the helium leak test and the helium leak test after the heat cycle described below were not carried out. Testing equipment: Helium leak tester G-FINE (Cosmo Instruments Co., Ltd.) Detection method: Atmospheric pressure method Detection range: Lower limit 5×10-7 Pa·m 3 / s Set pressure: 100kPa → 300kPa → 500kPa Evaluation: For all three composite moldings, the leakage amount after applying pressure for 30 seconds at each of the above set pressures was 5 x 10 -7 Pa·m 3 / s or less is set as 1, and 5 x 10 -7 Pa·m 3 If it exceeds / s, it is set to 2.

[0059] [Water immersion test after heat cycle, helium leak test] Three composite molded articles from each example were placed in an air-phase thermal shock tester (NT550A, manufactured by Kusumoto Chemicals Co., Ltd.) and subjected to 500 cycles (hereinafter referred to as heat cycles) consisting of a 30-minute hold at -40°C, a 30-minute hold at -40°C to 150°C, and a 30-minute hold at -40°C. After the heat cycles, each composite molded article from each example was evaluated using the same criteria as in the water immersion test and helium leak test described above. Since the composite molded article from Comparative Example 1 received a leakage rating of 2 in the helium leak test described above, the water immersion test and helium leak test were not performed after the heat cycles.

[0060] [Table 1] In Table 1, "-" indicates that the measurement was not performed.

[0061] 4 to 6, it was confirmed that linear grooves were formed in the first members of Examples 1 and 2 and Comparative Example 1 at a pitch P shown in Table 1. Furthermore, the unprocessed width, which is the distance between the opposing ends of adjacent grooves, was measured using image processing software, and the ratio B / P could be calculated from the average unprocessed width (unprocessed width B) and the set pitch P. 7 to 9, it was confirmed that grooves were formed in the thickness direction of the first member 10 in the first members of Examples 1 and 2 and Comparative Example 1, and that resin had certainly penetrated into the grooves. The set pitch P and the arithmetic mean value of the pitch P were almost the same. As shown in Table 1, the composite moldings of the examples had no leakage at least in the submersion test and were excellent in sealing properties. Not only did the composite moldings of the examples have no leakage in the submersion test, but also the leakage amount was 5×10 in the helium leak test. -7 Pa·m 3 / s or less. Furthermore, the composite molding of the example showed a helium leak test after heat cycle and a pressure of 500 kPa. -7 Pa·m 3 / s or less. Therefore, it can be seen that the composite moldings of the examples have superior sealing properties and higher reliability even when used in more severe environments. Based on the results of the helium leak test after the heat cycle described above for the examples, it can be said that there is an extremely high probability that no air leakage will be observed even if a water immersion test under a pressure of 400 kPa using compressed air is carried out after the heat cycle.

[0062] The composite moldings of the examples achieve the above-mentioned effects through simpler processing that does not result in excessive roughening, compared to, for example, crossing the scanning direction of laser scanning processing and processing into a grid pattern, and therefore the time required for surface processing in the production of composite moldings can be further reduced. [Explanation of symbols]

[0063] 1 Composite molded body 10 First member 20 Second member 30 Joint 40 2 or more straight grooves 50 Laser Light 60 Fixture for water immersion test X Long dashed line indicating the direction of the leak path Y first end Z Second end θ is the angle at which a straight groove of 2 or more intersects with the leak path direction (long dashed two-dot line X).

Claims

1. A composite molded body in which a first member and a second member made of different materials from the first member and covering at least a portion of an outer surface of the first member over the entire periphery are joined together, two or more linear grooves extending parallel to each other in a plan view are formed in at least a part of a joint portion of an outer surface of the first member with the second member, A composite molding, wherein the ratio B / P of the pitch P, which is the distance between the centers of adjacent two or more linear grooves, to the unprocessed width B, which is the width between adjacent two or more linear grooves, is 0.33 or more.

2. The composite compact of claim 1 , wherein none of the two or more linear grooves penetrates the joint.

3. 3. The composite compact according to claim 1, wherein at least one of the two or more linear grooves circumferentially surrounds the outer surface of the first member.

4. 3. The composite molded product according to claim 1, wherein the arithmetic mean height Sa of the outer surface of the first member at the joint with the second member is 8 to 150 μm.

5. The composite molded product according to claim 1 or 2, wherein the first member and the second member are directly bonded to each other.

6. 3. The composite molding according to claim 1, wherein after the following heat cycle, no air leakage is confirmed in a water immersion test using compressed air at a pressure of 400 kPa. (heat cycle) The composite molded body is heated at 150° C. for 30 minutes and then cooled at −40° C. for 30 minutes, and this cycle is repeated 500 times.

7. After the following heat cycle, the leakage amount in the helium leak test under the condition of 100 kPa according to JIS Z 2331 was 5 × 10 －７ P.A.M. ３ The composite molding according to claim 1 or 2, wherein the viscosity is 1 / s or less. (heat cycle) The composite molded body is heated at 150° C. for 30 minutes and then cooled at −40° C. for 30 minutes, and this cycle is repeated 500 times.

8. The composite molding according to claim 1 or 2, wherein the first member has one or more shapes selected from the group consisting of a cylindrical shape, a columnar shape, a rectangular tube shape, a prismatic shape, and a rectangular shape.

9. The composite molded product according to claim 1 or 2, wherein the first member has at least a bent portion.

10. 3. The composite molded product according to claim 1, wherein at least a portion of the outer surface of said first member is plated.

11. The composite compact according to claim 1 or 2, wherein the first member is a conductor.

12. The composite molded product according to claim 1 or 2, wherein the first member is a bus bar.

13. The composite compact according to claim 1 or 2, wherein the first member is a thermal conductor.

14. The composite compact according to claim 1 or 2, wherein the first component is a heat sink.

15. The composite compact according to claim 1 or 2, wherein the first member is an insulator.

16. 3. The composite compact according to claim 1, wherein the first member is made of ceramics.

17. The composite compact according to claim 1 or 2, wherein the first member comprises one or more materials selected from ceramics, copper, copper alloys, aluminum, aluminum alloys, and alloys thereof.

18. 3. The composite molded body according to claim 1, wherein the first member comprises one or more materials selected from ceramics, metals, graphite, and conductive polymers, and the second member comprises one or more materials selected from thermoplastic resins, thermosetting resins, rubbers, and elastomers.

19. A method for manufacturing a composite molded body in which a first member and a second member made of a different material from the first member and covering at least a portion of an outer surface of the first member over an entire periphery, comprising: forming two or more linear grooves extending parallel to each other in a plan view in at least a part of a joint portion between the outer surface of the first member and the second member; A manufacturing method in which the ratio B / P of the pitch P, which is the distance between the centers of adjacent two or more linear grooves, to the untreated width B, which is the width between adjacent two or more linear grooves, is 0.33 or more.

20. The method of claim 19 , wherein none of the two or more linear grooves penetrates the joint.

21. The manufacturing method according to claim 19 or 20, wherein forming the two or more linear grooves includes irradiating the first member with laser light.

22. The method according to claim 21 , wherein the laser light is a continuous wave laser light or a pulsed wave laser light.

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