Processed member and method for manufacturing the same

Abstract

To provide a workpiece member that can ensure the generation of action by silver provided on the surface of an oxide while reducing the manufacturing cost.SOLUTION: The workpiece member 1 includes a substrate 10 and a plurality of silver particles 30. The substrate 10 contains oxide ceramic. The substrate 10 has a principal surface 21. The plurality of silver particles 30 is provided on the principal surface 21.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to workpieces and the manufacture of workpieces. [Background technology]

[0002] A configuration in which a metal is provided on the surface of an oxide is known. For example, Patent Document 1 discloses a composition in which a metal including silver is formed on the surface of an oxide particle. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2001-038222 A Summary of the Invention [Problem to be solved by the invention]

[0004] The structure in which silver is provided on the surface of an oxide provides various effects. For example, oxides such as titanium oxide are known as photocatalysts, and if silver is provided on the surface of the photocatalyst, antibacterial effects are achieved even when light is not irradiated. In addition, electrons generated by irradiation with ultraviolet light are collected from the photocatalyst to the silver provided on the surface of the photocatalyst, and an oxidation-reduction reaction occurs via the silver, improving the efficiency of the oxidation-reduction reaction.

[0005] Localized surface plasmon resonance may also occur due to silver particles provided on the surface of the oxide. Localized surface plasmon resonance converts light energy into electrical energy. For example, the incidence of visible light on silver particles enhances the movement of electrons. For example, if localized surface plasmon resonance occurs due to silver particles provided on the surface of a photocatalyst, electrons are generated in the photocatalyst, and electrons are also activated in the silver particles in response to the incidence of a wavelength corresponding to localized surface plasmon resonance. This expands the wavelength range that generates the redox reaction, and further improves the generation efficiency of the redox reaction.

[0006] In Patent Document 1, a plurality of compositions are applied to the surface of a plate-shaped member. In each of these compositions, a metal containing silver is formed on the surface of the oxide particles. Therefore, the above-mentioned action such as the oxidation-reduction reaction can occur. However, in the processed member configured in this manner, the composition exposed on the surface of the processed member is only a small part of the plurality of compositions applied. The above-mentioned action is brought about by the composition arranged on the surface of the processed member, and the composition located inside is unlikely to contribute to the above action. Therefore, there is a relatively large amount of silver and oxide that does not contribute to the action. For example, light incident on the surface of the processed member is unlikely to reach the composition located inside, and the composition located inside is unlikely to act as a photocatalyst. For this reason, even if the processed member generates the same level of action, the more compositions located inside, the higher the material cost such as silver. A composition is generated by forming silver on each of the plurality of oxide particles, and then the generated composition is applied to the surface of a separate member, so manufacturing is also time-consuming.

[0007] One aspect of the present invention aims to provide a processed member that can ensure the generation of the effect of silver particles provided on the surface of an oxide while reducing manufacturing costs. Another aspect of the present invention aims to provide a manufacturing method that can produce a processed member that can ensure the generation of the effect of silver particles provided on the surface of an oxide while reducing manufacturing costs. [Means for solving the problem]

[0008] The processed member according to one aspect of the present invention includes a substrate and a plurality of silver particles. The substrate includes an oxide ceramic. The substrate has a main surface. The plurality of silver particles are provided on the main surface.

[0009] In this processed member, a plurality of silver particles are provided on the main surface of a substrate containing oxide ceramics. According to this configuration, the action of the silver particles occurs at each location where the plurality of silver particles are provided, and the number of silver particles that do not contribute to the occurrence of the action is reduced. Therefore, the material cost can be reduced while the occurrence of the action of the plurality of silver particles is ensured. The plurality of silver particles are provided on the main surface of the substrate, and the number of parts is reduced. Therefore, the manufacturing effort can also be reduced. In this way, the occurrence of the action of the silver particles can be ensured while reducing manufacturing costs.

[0010] In the above embodiment, the particle size of each silver particle may be 10 to 1000 nm, in which case various actions such as localized surface plasmon resonance and photocatalytic oxidation-reduction reactions are more likely to occur.

[0011] In the above-mentioned embodiment, the oxide ceramic may be an oxide containing titanium, in which case the oxidation-reduction reaction caused by the photocatalyst is more likely to occur.

[0012] In the above embodiment, the thickness of the substrate may be greater than 3 μm, in which case the oxidation-reduction reaction caused by the photocatalyst is more likely to occur.

[0013] In the above-mentioned embodiment, the main surface of the substrate may include concave portions and convex portions. Silver particles may be provided in the concave portions and the convex portions.

[0014] In the above-mentioned one embodiment, the processed member may further include a metal block containing silver provided on the main surface. The area of ​​the metal block when viewed from a direction perpendicular to the main surface is 0.01 mm 2 It may be more than that.

[0015] A method for manufacturing a processed member in another aspect of the present invention includes a disposing step and a forming step. In the disposing step, a first and a second electrode are disposed on a surface of a substrate. The substrate contains an oxide ceramic. In the forming step, a voltage is applied between the first electrode and the second electrode to form a plurality of silver particles on the surface. The second electrode contains silver. In the forming step, the potential of the second electrode is higher than the potential of the first electrode.

[0016] In the above-mentioned another aspect, an electric field is generated between the first and second electrodes by applying a voltage to the first and second electrodes. As a result, a plurality of silver particles are formed on the surface of the substrate. In this case, the manufacturing process is reduced, and the manufacturing effort is also reduced. Therefore, it is possible to manufacture a processed member in which the action of the silver particles is ensured while reducing the manufacturing cost.

[0017] In the above-mentioned another aspect, the surface of the substrate may include a main surface. In the disposing step, the second electrode may be disposed on the main surface. In this case, a plurality of silver particles are formed on the main surface on which the second electrode is disposed.

[0018] In the above-mentioned another embodiment, in the forming step, an electric field having an electric field strength of 80 V / mm or more may be generated between the first electrode and the second electrode, in which case the forming speed of the plurality of silver particles is improved.

[0019] In the above-mentioned another aspect, the oxide ceramic may be an oxide containing titanium, in which case the rate of formation of the plurality of silver particles is improved. Effect of the Invention

[0020] One aspect of the present invention provides a processed member that can ensure the generation of an effect due to silver particles provided on the surface of an oxide while reducing manufacturing costs. Another aspect of the present invention provides a manufacturing method that can manufacture a processed member that can ensure the generation of an effect due to silver particles provided on the surface of an oxide while reducing manufacturing costs. [Brief description of the drawings]

[0021] [Figure 1] FIG. 2 is a schematic diagram of a processed member in the present embodiment. [Diagram 2] FIG. [Diagram 3] 1 is a flowchart showing a manufacturing method of a processed member. [Figure 4] 1(a) and 1(b) are diagrams illustrating a manufacturing process of a processed member. [Diagram 5] 13(a) and 13(b) are diagrams illustrating a manufacturing process of a processed member according to a modified example of the present embodiment. [Figure 6] 1 is a table showing the ease of forming silver particles depending on the material of the substrate. [Figure 7] 10 is a schematic diagram of a processed member according to a modified example of the embodiment. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same or equivalent elements are designated by the same reference numerals, and duplicated explanations will be omitted.

[0023] First, the configuration of a processed member in this embodiment will be described with reference to Fig. 1 and Fig. 2. Fig. 1 shows a schematic diagram of a processed member in this embodiment. Fig. 2 shows a cross section of the processed member. The processed member 1 includes a base material 10 and a plurality of silver particles 30.

[0024] The substrate 10 includes, on the surface 20, a pair of main surfaces 21 and 22 that face each other in a direction D1. The main surfaces 21 and 22 extend in a direction D2 that intersects with the direction D1. For example, the direction D1 is perpendicular to the direction D2. The direction D1 is the thickness direction of the substrate 10.

[0025] The substrate 10 is, for example, a rectangular substrate when viewed in the direction D1. The length of the substrate 10 in the direction D2 is, for example, greater than the length of the substrate 10 in the direction D1. The area of ​​the main surface 21 is, for example, greater than the cross-sectional area of ​​the substrate 10 in the direction D1. The thickness of the substrate 10 is, for example, greater than 3 μm.

[0026] The main surface 21 includes a plurality of recesses 21a and a plurality of protrusions 21b as shown in FIG. 2. The depth of the recesses 21a is, for example, 10 to 1000 nm in the direction D1. The "depth of the recess" refers to the length of the recesses 21a in the direction D1. The height of the protrusions 21b is, for example, 10 to 1000 nm in the direction D1. The "height of the protrusions" refers to the length of the protrusions 21b in the direction D1. The width of the recesses 21a and the width of the protrusions 21b are, for example, 10 to 1000 nm. The "width of the recess" refers to the length of the recesses 21a in the direction D2. The "width of the protrusions" refers to the length of the protrusions 21b in the direction D2. For example, the depth of the recesses 21a, the height of the protrusions 21b, the width of the recesses 21a, and the width of the protrusions 21b are each equivalent to the diameter of one of the silver particles 30.

[0027] The substrate 10 includes a sintered body. The substrate 10 is formed by firing. The sintered body includes an oxide ceramic. The oxide ceramic includes at least one selected from, for example, an oxide containing titanium and an oxide containing zircon. The oxide containing titanium includes at least one selected from, for example, calcium titanate, barium titanate, strontium titanate, and titanium oxide. The oxide containing zircon includes at least one selected from, for example, calcium zirconate, and barium zirconate. In this embodiment, the substrate 10 is made of titanium oxide and does not include a peroxo group. The substrate 10 may be various photocatalytic materials.

[0028] The plurality of silver particles 30 are provided on the main surface 21 of the substrate 10. Each silver particle 30 is in contact only with the main surface 21 of the substrate 10 or with other silver particles 30 among the plurality of silver particles 30. The particle size of each silver particle is, for example, 10 to 1000 nm. As shown in FIG. 2, the plurality of silver particles 30 are provided in the recesses 21a and protrusions 21b. The plurality of silver particles 30 are provided along the irregularities of the main surface 21. The area of ​​the region on the main surface 21 where the plurality of silver particles 30 are provided is, for example, 1 mm 2 That's all.

[0029] Next, a method for manufacturing the processed member 1 will be described with reference to Fig. 3 to Fig. 5. Fig. 3 is a flow chart showing the method for manufacturing the processed member. Fig. 4(a), Fig. 4(b), Fig. 5(a), and Fig. 5(b) are diagrams showing the manufacturing process of the processed member. Fig. 6 is a table showing the easiness of forming silver particles depending on the material of the base material.

[0030] First, the substrate 10 is prepared (step S1). The surface 20 of the substrate 10 includes a main surface 21 extending in a direction D2 intersecting with the thickness direction D1.

[0031] Next, the metal lump 40 and the negative electrode 50 are arranged (step S2). For example, FIG. 4(a) is a view of the state in which the metal lump 40 and the negative electrode 50 are arranged on the substrate 10, as viewed from a direction D3 perpendicular to the directions D1 and D2. FIG. 4(b) is a view of the state in which the metal lump 40 and the negative electrode 50 are arranged on the substrate 10, as viewed from a direction D2. As shown in FIG. 4(a) and FIG. 4(b), the metal lump 40 and the negative electrode 50 are arranged on the main surface 21. The metal lump 40 and the negative electrode 50 face each other in the direction D2. The metal lump 40 and the negative electrode 50 are spaced apart from each other. A region α defined by the edge 41 of the metal lump 40 and the edge 51 of the negative electrode 50 is formed on the main surface 21. In the region α, the main surface 21 of the substrate 10 is exposed. The edge 41 of the metal lump 40 and the edge 51 of the negative electrode 50 extend parallel to each other.

[0032] As a modification of this embodiment, as shown in FIG. 5(a) and FIG. 5(b), the metal lump 40 may be disposed on the main surface 21, and the negative electrode 50 may be disposed on the main surface 22. FIG. 5(a) is a view of the state in which the metal lump 40 and the negative electrode 50 are disposed on the substrate 10, as viewed from the direction D3. FIG. 5(b) is a view of the state in which the metal lump 40 and the negative electrode 50 are disposed on the substrate 10, as viewed from the direction D2. In this case, the metal lump 40 and the negative electrode 50 face each other in a direction inclined to the direction D1 and the direction D2. The metal lump 40 and the negative electrode 50 are spaced apart from each other. When viewed from the direction D1, the negative electrode 50 includes a region β that does not overlap with the metal lump 40. The region β is defined by the edge 41 of the metal lump 40. When viewed from a direction perpendicular to the main surface 21, the region β is located between the edge 41 of the metal lump 40 and the edge 51 of the negative electrode 50. In the region β, the main surface 21 of the substrate 10 is exposed.

[0033] In step S2, the metal lump 40 is placed on a portion of the main surface 21. The metal lump 40 contains silver. The metal lump 40 consists, for example, of only silver. The metal lump 40 may contain components other than silver. The metal lump 40 may be, for example, an alloy containing silver. The metal lump 40 is, for example, a resin electrode, a conductive paste, or a thin film formed by sputtering. The metal lump 40 is, for example, a mixed solid of epoxy resin and silver. The metal lump 40 is a positive electrode.

[0034] The negative electrode 50 is formed of a conductive material. The negative electrode 50 includes at least one selected from nickel, silver, copper, gold, tin, and the like. The negative electrode 50 is, for example, a resin electrode, a conductive paste, a thin film formed by sputtering, or an electrode plate. For example, the metal lump 40 corresponds to the second electrode, and the negative electrode 50 corresponds to the first electrode.

[0035] Next, a voltage is applied between the metal lump 40 and the negative electrode 50 (step S3). The metal lump 40 is the anode, and the negative electrode 50 is the cathode. A voltage is applied so that the metal lump 40 and the negative electrode 50 have different potentials. In step S3, the potential at the metal lump 40 is higher than the potential at the negative electrode 50. For example, different potentials are applied to the metal lump 40 and the negative electrode 50. The potential applied to the metal lump 40 is higher than the potential applied to the negative electrode 50. The potential applied to either the metal lump 40 or the negative electrode 50 may be zero. Either the metal lump 40 or the negative electrode 50 may be grounded.

[0036] In step S3, an electric field E is generated from the metal lump 40 toward the negative electrode 50. The electric field E forms a plurality of silver particles 30 on the main surface 21 of the substrate 10. In the configuration shown in FIG. 4(a) and FIG. 4(b), the electric field E is generated along the main surface 21. As a result, a plurality of silver particles 30 are formed in a region α of the main surface 21 located between the metal lump 40 and the negative electrode 50. In the configuration shown in FIG. 5(a) and FIG. 5(b), an electric field E1 having a component of the direction D2 of the electric field E is generated along the main surface 21. As a result, a plurality of silver particles 30 are formed in a region β of the main surface 21. At this time, the plurality of silver particles 30 are formed in the direction D2 from the metal lump 40 side with the passage of time.

[0037] The environmental temperature in step S3 is 100° C. or higher, and more preferably 125° C. or higher. The electric field strength generated between metal lump 40 and negative electrode 50 depends on, for example, the voltage applied between metal lump 40 and negative electrode 50. The electric field strength of the electric field generated between metal lump 40 and negative electrode 50 is 80 V / mm or higher.

[0038] Next, it is determined whether a predetermined time has elapsed (step S4). The voltage application in step S3 continues even during step S4. If it is determined that the predetermined time has elapsed, the voltage application is stopped and the process proceeds to step S5. If it is determined that the predetermined time has not elapsed, step S4 is repeated. The predetermined time in step S4 is the time required to form a plurality of silver particles 30, and is changed depending on the material of the substrate 10, the area of ​​the region where the plurality of silver particles 30 are formed, the environmental temperature, and the electric field strength between the metal lump 40 and the negative electrode 50, etc.

[0039] FIG. 6 shows an index indicating the ease of forming a plurality of silver particles 30 for each material of the base material 10. FIG. 6 shows the ratio of the length in the direction D2 of the region in which a plurality of silver particles 30 are formed when the same electric field strength exists between the metal lump 40 and the negative electrode 50 and the same time has elapsed. The data shown in FIG. 6 is data obtained in the configuration shown in FIG. 4(a) and FIG. 4(b). The data in FIG. 6 is based on the length in the direction D2 of the region in which a plurality of silver particles 30 are formed when 140 hours have elapsed in the state in which the electric field strength exists. The data in FIG. 6 shows the ratio with respect to each material, with the case in which the material of the base material 10 is titanium oxide being set as "1.00".

[0040] 6, when the material of the substrate 10 contains an oxide containing titanium, a value of "0.5" or more is shown. Therefore, it was confirmed that when the material of the substrate 10 contains an oxide containing titanium, a plurality of silver particles 30 are easily formed. In other words, it was confirmed that the formation rate of a plurality of silver particles 30 is improved by using an oxide containing titanium as the material of the substrate 10.

[0041] When it is determined in step S4 that a predetermined time has elapsed, the metal lump 40 and the negative electrode 50 are removed (step S5). For example, the metal lump 40 and the negative electrode 50 are removed from the substrate 10 while the plurality of silver particles 30 formed in steps S3 to S4 are left on the main surface 21 of the substrate 10.

[0042] As described above, the processed member 1 is manufactured by steps S1 to S5. The manufacturing method of the processed member 1 in steps S1 to S5 described above is an example, and the order of the steps is not limited to this. As a modification of this embodiment, step S5 may be omitted. Therefore, the metal lump 40 and the negative electrode 50 may be left on the substrate 10. In step S5, only the negative electrode 50 arranged on the main surface 22 may be removed from the substrate 10.

[0043] 7 shows a processed member 1A in a modified example of this embodiment. This modified example is generally similar to or the same as the embodiment described above. This modified example differs from the embodiment described above in that only the negative electrode 50 arranged on the main surface 22 is removed from the substrate 10, and the metal lump 40 remains. Below, the differences between the embodiment described above and the modified example will be mainly described.

[0044] The processed member 1A includes a base material 10, a plurality of silver particles 30, and a metal lump 40. The metal lump 40 is provided on the main surface 21 of the base material 10. In other words, the metal lump 40 is provided on the same side as the plurality of silver particles 30. The metal lump 40 contains silver as described above. The metal lump 40 may contain components other than silver. For example, the area of ​​the metal lump 40 when viewed from a direction perpendicular to the main surface 21 is larger than the area of ​​each silver particle 30 when viewed from a direction perpendicular to the main surface 21. The area of ​​the region on the main surface 21 where the metal lump 40 is provided is larger than the area of ​​the region on the main surface 21 where the plurality of silver particles 30 are provided. The area of ​​the metal lump 40 when viewed from a direction perpendicular to the main surface 21 is, for example, 0.01 mm 2 That is all. The weight of the metal lump 40 is greater than the total weight of the plurality of silver particles 30. The metal lump 40 in the processed member 1 also contains, for example, a resin. The metal lump 40 in the processed member 1 is, for example, a mixed solid of epoxy resin and silver.

[0045] Next, the effects of the processed member and the manufacturing method of the processed member in the present embodiment and the modified example will be described. As described above, in the processed member 1, 1A, a plurality of silver particles 30 are provided on the main surface 21 of the base material 10 containing oxide ceramics. According to this configuration, the action of the silver particles 30 occurs at each location where the plurality of silver particles 30 are provided, and the silver particles that do not contribute to the generation of the action are reduced. Therefore, the material cost can be reduced while the generation of the action by the plurality of silver particles 30 is ensured. A plurality of silver particles 30 are provided on the main surface 21 of the base material 10, and oxide particles and the like are not used. Therefore, the number of components is reduced, and the manufacturing effort can also be reduced. In this way, the generation of the action by the silver particles provided on the surface of the oxide can be ensured while reducing the manufacturing cost.

[0046] The particle size of each silver particle 30 is, for example, 10 to 1000 nm. In this case, various actions such as localized surface plasmon resonance and photocatalytic oxidation-reduction reactions are more likely to occur.

[0047] The substrate 10 may contain an oxide containing titanium. In this case, the oxidation-reduction reaction caused by the photocatalyst occurs more easily. The rate at which the multiple silver particles are formed is improved.

[0048] The thickness of the substrate 10 may be greater than 3 μm. In this case, the oxidation-reduction reaction caused by the photocatalyst occurs more easily.

[0049] The main surface 21 of the substrate 10 includes recesses 21a and protrusions 21b. Silver particles 30 are provided in the recesses 21a and the protrusions 21b. In this case, the silver particles 30 can be arranged at a higher density. Therefore, the effect of the silver particles 30 is more likely to occur.

[0050] The processed member 1A further includes a metal lump 40 that is provided on the main surface 21 and contains silver. In this case, since a step of removing the metal lump 40 that functions as an anode during manufacturing is not required, the processed member 1A can be manufactured at even lower cost. The area of ​​the metal lump 40 when viewed from a direction perpendicular to the main surface 21 is 0.01 mm2. 2As described above, it is different from the silver particles 30.

[0051] In the above processing method, application of a voltage between the metal lump 40 and the negative electrode 50 generates an electric field between the metal lump 40 and the negative electrode 50. As a result, a plurality of silver particles 30 are formed on the surface 20 of the substrate 10. In this case, the manufacturing process is reduced, and the manufacturing effort is also reduced. Therefore, it is possible to manufacture the processed member 1, 1A in which the generation of the effect of the silver particles 30 is ensured while reducing the manufacturing cost.

[0052] In the disposing step, the metal lump 40 is disposed on the main surface 21. In this case, a plurality of silver particles 30 are formed on the main surface 21 on which the metal lump 40 is disposed.

[0053] In the formation process, an electric field with an electric field strength of 80 V / mm or more is generated between the metal lump 40 and the negative electrode 50. In this case, the formation speed of the plurality of silver particles is improved.

[0054] Although the embodiments and modifications of the present invention have been described above, the present invention is not necessarily limited to the above-described embodiments, and various modifications are possible without departing from the spirit of the present invention.

[0055] For example, the substrate 10 is not limited to a configuration having a pair of opposing main surfaces 21 and 22. The substrate 10 may include one or three or more main surfaces.

[0056] Each silver particle 30 may contain other impurities as long as the main component is silver. For example, each silver particle 30 may contain chlorine, bromine, sulfur, or the like as impurities. [Explanation of symbols]

[0057] Reference Signs List 1,1A...workpiece, 10...substrate, 20...surface, 21,22...main surface, 21a...concave portion, 21b...convex portion, 30...silver particle, 40...metal lump, 50...negative electrode, D1...direction, E,E1...electric field.

Claims

1. a substrate including an oxide ceramic and having a major surface; a plurality of silver particles provided on the main surface, The particle size of each of the silver particles is 10 to 1000 nm; The oxide ceramic contains an oxide containing titanium, the main surface of the substrate includes concave and convex portions having a width equivalent to the particle diameter of each of the silver particles, The silver particles are provided on the concave and convex portions.

2. The workpiece of claim 1 , wherein the substrate has a thickness greater than 3 μm.

3. A metal mass including silver is provided on the main surface, 3. The processed member according to claim 1, wherein an area of ​​the metal block when viewed from a direction perpendicular to the main surface is 0.01 mm2 or more.

4. A method for producing a processed member according to any one of claims 1 to 3, a step of disposing a first electrode and a second electrode on a surface of the substrate; and applying a voltage between the first electrode and the second electrode to form a plurality of the silver particles on the surface, the second electrode comprises silver; In the forming step, a potential of the second electrode is higher than a potential of the first electrode.

5. The surface of the substrate includes a main surface, The method for manufacturing a processed member according to claim 4 , wherein in the disposing step, the second electrode is disposed on the main surface.

6. The method for manufacturing a processed member according to claim 4 or 5, wherein in the forming step, an electric field having an electric field strength of 80 V / mm or more is generated between the first electrode and the second electrode.

7. The method for producing a processed member according to claim 4 , wherein the oxide ceramic contains an oxide containing titanium.

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