Composite material image quality indicator and preparation method and application thereof

Abstract

The invention relates to a composite material image quality indicator and a preparation method and application thereof, and the preparation method of the composite material image quality indicator comprises the following steps: (1) paving a composite material prepreg according to the size requirement of the composite material image quality indicator, and pre-burying a wire type filler to a target depth in the paving process; (2) curing and forming the prepreg with the pre-embedded wire-type filler in the step (1), and sequentially performing first post-treatment and second post-treatment on an obtained formed part to obtain a composite material part with a wire-type cavity; and (3) carrying out drying and edge sealing on the composite material workpiece obtained in the step (2) to obtain the composite material image quality indicator. According to the method, the first post-treatment and the second post-treatment are set, so that the silk-type filler is completely separated out, controllable manufacturing of the micron-sized long and narrow cavity is realized, and the manufacturing precision is high; the preparation method can be used for preparing composite material image quality indicators of different material systems, and is good in universality.

Description

Technical Field

[0001] The present invention relates to the technical field of composite material ray detection, and in particular to a composite material image quality meter and a preparation method and application thereof. Background Art

[0002] Radiographic testing technology is one of the main means of internal quality testing of composite materials. Radiographic testing can effectively detect defects such as pores, inclusions, cracks and cavities inside composite materials. When performing radiographic testing on composite products, an image quality meter is needed to measure, inspect and quantitatively evaluate the quality of radiographic film images and characterize their detection resolution. Only when its detection resolution meets the detection requirements of the minimum defect size of the product can the radiographic test results be used for internal quality evaluation of the product.

[0003] GBT 23901 "Nondestructive Testing Radiographic Test Image Quality" and GJB1038.2A "Fiber-reinforced Composite Material Nondestructive Testing Methods Part 2 X-ray Photographic Test" have made relevant provisions on the drawings and specifications of the image quality meter used, but due to the complexity of the composite material components and the uniqueness of the molding process, the minimum accuracy of 0.1mm has greatly increased the difficulty of processing the composite material image quality meter and cannot meet the actual needs. At present, in the field of domestic aviation technology, the general image quality meter prepared according to the above two standards has an inefficient and cumbersome preparation process and is not widely used on site.

[0004] CN 104407060A discloses a method for manufacturing a composite material porosity comparison test block, comprising the following steps: (1) designing a prepreg ply according to the thickness requirement of the porosity comparison test block, and evenly sprinkling a portion of glass microspheres on each ply; (2) placing the ply-laid workpiece into an autoclave for curing, trimming the cured workpiece to form a comparison test block, and then performing ultrasonic nondestructive testing on the comparison test block to determine the ultrasonic attenuation signal of the comparison test block; (3) preparing a porosity test plate containing real pore defects, using an ultrasonic flaw detector to test the test plate, finding an area in the test plate that has the same ultrasonic attenuation signal as the comparison test block in step (2), and marking it; and (4) performing metallographic microscopic analysis on the area selected in step (3) to determine the value of the porosity. However, the glass microspheres embedded in the porosity comparison test block cannot be eliminated, which affects the ultrasonic attenuation characteristics of the porosity comparison test block, resulting in an essential difference between the ultrasonic attenuation of the embedded material and the ultrasonic attenuation of the actual pores in the composite material, which in turn has a great impact on the evaluation of the porosity in the composite material and reduces the detection accuracy.

[0005] CN 218584690U discloses a digital ray detection double-wire image quality meter, comprising a carrier plate, an image quality meter mark and oblique parallel wire pairs encapsulated in the carrier plate, wherein the oblique parallel wire pairs are 13 in number, and two adjacent oblique parallel wire pairs are parallel and have equal spacing; each oblique parallel wire pair comprises two metal wires of exactly the same shape and structure, and a gap is provided between the two metal wires; the metal wire diameter of each oblique parallel wire pair and the gap between the two metal wires gradually decrease in sequence. However, the manufacturing accuracy of the double-wire image quality meter still needs to be improved.

[0006] In view of the shortcomings of the existing technology, it is urgently necessary to provide a method for preparing a composite material image quality meter with simple molding process, high manufacturing precision and good versatility. Summary of the invention

[0007] The purpose of the present invention is to provide a composite material image quality meter and its preparation method and application. By pre-embedding a wire-type filler during the composite material molding process and forming a narrow and long cavity with controllable size through post-processing, the composite material image quality meter has high accuracy.

[0008] In order to achieve the purpose of the invention, the present invention adopts the following technical solutions:

[0009] In a first aspect, the present invention provides a method for preparing a composite material image quality meter, the method comprising the following steps:

[0010] (1) Laying composite material prepreg according to the size requirements of the composite material image quality meter, and pre-embedding the silk-type filler to the target depth during the laying process;

[0011] (2) curing and molding the composite material prepreg with the pre-embedded wire-type filler described in step (1), and sequentially performing a first post-treatment and a second post-treatment on the obtained molded product to obtain a composite material product having a wire-type cavity;

[0012] (3) Drying and edge-sealing the composite material product obtained in step (2) to obtain the composite material image quality meter.

[0013] The preparation method of the composite material image quality meter provided by the present invention embeds a silk-type filler in the process of paving a composite material prepreg, and then separates the silk-type filler from the composite material prepreg through a first post-processing and a second post-processing to simulate discontinuity. Compared with the traditional preparation method which can only achieve an accuracy of 0.1 mm, the present invention can realize the controllable manufacture of micron-level narrow and long cavities with high manufacturing accuracy; the preparation method can be used for the preparation of composite material image quality meters of different material systems, and has good versatility.

[0014] Preferably, the composite material prepreg in step (1) comprises a fiber-reinforced composite material prepreg.

[0015] Preferably, the material and specification of the wire-type filler in step (1) are selected according to the size requirements, material and target sensitivity of the composite material image quality meter.

[0016] Preferably, the material of the wire-type filler in step (1) includes metal wire or soluble fiber.

[0017] Preferably, the holding time in the curing molding in step (2) is 80-100 min, for example, it can be 80 min, 85 min, 90 min, 95 min or 100 min, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0018] Preferably, the holding temperature in the curing molding in step (2) is 120-130°C, for example, it can be 120°C, 122°C, 125°C, 128°C or 130°C, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0019] Preferably, the heating pressure in the curing molding in step (2) is 300-310 kPa, for example, it can be 300 kPa, 302 kPa, 305 kPa, 308 kPa or 310 kPa, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0020] Preferably, the vacuum degree in the curing molding in step (2) is -80 kPa to -90 kPa, for example, it can be -80 kPa, -82 kPa, -85 kPa, -88 kPa or -90 kPa, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0021] The curing molding is carried out under specific conditions, so that a perfect image quality meter without delamination and pores can be obtained, thereby avoiding defects that affect the judgment of the image quality meter when it is used.

[0022] Preferably, in step (2), the first post-treatment and the second post-treatment independently include chemical treatment and / or physical treatment.

[0023] Compared with a single post-treatment, the molded parts are subjected to the first post-treatment and the second post-treatment in sequence, which can further realize the controllable manufacturing of micron-level narrow and long cavities and significantly improve the manufacturing accuracy of the composite material image quality meter; chemical treatment and / or physical treatment can make the silk-type filler completely precipitate and completely separate from the composite material prepreg body.

[0024] Preferably, the first post-treatment in step (2) is chemical treatment and physical treatment.

[0025] The first post-treatment option combines chemical treatment with physical treatment, which can more quickly and efficiently promote the complete precipitation of the silk-type filler, thereby achieving separation from the composite prepreg body.

[0026] Preferably, the second post-treatment in step (2) is a physical treatment.

[0027] Preferably, the physical treatment includes at least one of a temperature increase treatment, an ultrasonic vibration treatment or a stripping treatment.

[0028] The temperature raising treatment can realize the melting treatment of the silk-type filler, thereby separating it from the composite material prepreg body; the ultrasonic vibration treatment and the stripping treatment can directly separate the silk-type filler from the composite material prepreg body.

[0029] Preferably, the chemical treatment comprises acid etching treatment or alkali etching treatment.

[0030] The acid etching treatment or alkaline etching treatment can achieve dissolution and elimination of the filament-type filler, leaving a micron-level narrow and long cavity, and achieve separation of the filament-type filler from the composite material prepreg body.

[0031] Preferably, step (3) also includes a step of machining the composite material part before the drying and edge sealing.

[0032] The machining is to process the outer edges of the composite material parts.

[0033] Preferably, after the edge sealing in step (3), the step of calibrating the actual width of the wire-shaped cavity is also included.

[0034] The calibration step can check whether the quality of the composite material image quality meter meets the requirements, thereby improving the success rate of preparation.

[0035] Preferably, the calibration method includes a radiographic method or a metallographic method.

[0036] Preferably, if the calibration result is determined to not meet the quality requirements, step (1), step (2) and step (3) are repeated.

[0037] As a preferred technical solution of the preparation method of the present invention, the preparation method comprises the following steps:

[0038] (1) paving fiber-reinforced composite prepreg according to the size requirements of the composite image quality meter, and pre-embedding a wire-type filler to a target depth during the paving process; the material and specification of the wire-type filler are selected according to the size requirements, material and target sensitivity of the composite image quality meter; the material of the wire-type filler is metal wire or soluble fiber;

[0039] (2) curing and molding the fiber-reinforced composite material prepreg with embedded wire-type fillers in step (1), wherein the holding time in the curing and molding is 80-100 min, the holding temperature is 120-130° C., the heating pressure is 300-310 kPa, and the vacuum degree is -80 kPa to -90 kPa; the obtained molded product is subjected to a first post-treatment and a second post-treatment in sequence to obtain a composite material product with a wire-type cavity; the first post-treatment is a chemical treatment and a physical treatment; the second post-treatment is a physical treatment; the physical treatment includes at least one of a heating treatment, an ultrasonic vibration treatment or a stripping treatment; the chemical treatment includes an acid etching treatment or an alkali etching treatment;

[0040] (3) machining, drying and edge-sealing the composite material product obtained in step (2), and then calibrating the actual width of the wire-shaped cavity using a X-ray method or a metallographic method. When the calibration result is determined to not meet the quality requirements, repeating steps (1), (2) and (3) to obtain the composite material image quality meter.

[0041] In a second aspect, the present invention provides a composite material image quality meter, which is prepared by the preparation method described in the first aspect.

[0042] The preparation method provided by the present invention can accurately and efficiently prepare a composite material image quality meter, and can also realize the controllable manufacturing of micron-level narrow and long cavities, with high manufacturing accuracy and product quality meeting requirements.

[0043] In a third aspect, the present invention provides an application of the composite material image quality meter as described in the second aspect, wherein the composite material image quality meter is used in radiation detection.

[0044] Compared with the prior art, the present invention has the following beneficial effects:

[0045] The preparation method of the composite material image quality meter provided by the present invention embeds a silk-type filler in the process of paving a composite material prepreg, and then separates the silk-type filler from the composite material prepreg through a first post-processing and a second post-processing to simulate discontinuity. Compared with the traditional preparation method which can only achieve an accuracy of 0.1 mm, the present invention can realize the controllable manufacture of micron-level narrow and long cavities with high manufacturing accuracy; the preparation method can be used for the preparation of composite material image quality meters of different material systems, and has good versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 is a schematic structural diagram of a composite material image quality meter provided in Example 1 of the present invention;

[0047] Figure 2 is an optical diagram of the composite material image quality meter provided in Example 1 of the present invention;

[0048] Figure 3 It is a calibration schematic diagram of the composite material image quality meter provided in Example 1 of the present invention. DETAILED DESCRIPTION

[0049] The technical solution of the present invention is further described below by specific implementation methods. It should be understood by those skilled in the art that the embodiments are only to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0050] Example 1

[0051] This embodiment provides a composite material image quality meter. The structural schematic diagram and the optical diagram of the composite material image quality meter are respectively as shown in Figure 1 , Figure 2 As shown, the preparation method of the composite material image quality meter includes the following steps:

[0052] (1) paving fiber reinforced composite material prepreg according to the size requirements of the composite material image quality meter, and pre-embedding a wire-type filler to a target depth during the paving process; the material and specification of the wire-type filler are selected according to the size requirements, material and target sensitivity of the composite material image quality meter; the material of the wire-type filler is metal wire;

[0053] (2) curing the fiber-reinforced composite material prepreg embedded with the wire-shaped filler in step (1), wherein the holding time in the curing process is 90 min, the holding temperature is 125° C., the heating pressure is 305 kPa, and the vacuum degree is −85 kPa; the obtained molded product is subjected to a first post-treatment and a second post-treatment in sequence to obtain a composite material product having a wire-shaped cavity; the first post-treatment is an acid etching treatment and an ultrasonic vibration treatment; and the second post-treatment is an ultrasonic vibration treatment;

[0054] (3) The composite material product obtained in step (2) is machined, dried and edge-sealed, and then the actual width of the wire-shaped cavity is calibrated using a ray method. The calibration diagram is shown in FIG. Figure 3 As shown, the actual width of the wire-shaped cavity is 50 μm, and the composite image quality meter is obtained.

[0055] The manufacturing accuracy of the obtained composite material image quality meter can reach 1μm and can be used in radiation detection technology.

[0056] Example 2

[0057] This embodiment provides a composite material image quality meter, and the preparation method of the composite material image quality meter includes the following steps:

[0058] (1) paving fiber reinforced composite material prepreg according to the size requirements of the composite material image quality meter, and pre-embedding a wire-type filler to a target depth during the paving process; the material and specification of the wire-type filler are selected according to the size requirements, material and target sensitivity of the composite material image quality meter; the material of the wire-type filler is metal wire;

[0059] (2) curing the fiber-reinforced composite material prepreg embedded with the wire-shaped filler in step (1), wherein the holding time in the curing process is 80 min, the holding temperature is 130° C., the heating pressure is 300 kPa, and the vacuum degree is −80 kPa; the obtained molded product is subjected to a first post-treatment and a second post-treatment in sequence to obtain a composite material product having a wire-shaped cavity; the first post-treatment is an alkali etching treatment and a heating treatment; the second post-treatment is an ultrasonic vibration treatment;

[0060] (3) machining, drying and edge-sealing the composite material product obtained in step (2), and then calibrating the actual width of the wire-shaped cavity using a X-ray method to obtain the composite material image quality meter.

[0061] The manufacturing accuracy of the obtained composite material image quality meter can reach 2μm and can be used in radiation detection technology.

[0062] Example 3

[0063] This embodiment provides a composite material image quality meter, and the preparation method of the composite material image quality meter includes the following steps:

[0064] (1) paving fiber-reinforced composite prepreg according to the size requirements of the composite image quality meter, and pre-embedding a silk-type filler to a target depth during the paving process; the material and specification of the silk-type filler are selected according to the size requirements, material and target sensitivity of the composite image quality meter; the material of the silk-type filler is soluble fiber;

[0065] (2) curing the fiber-reinforced composite material prepreg embedded with the wire-shaped filler in step (1), wherein the holding time in the curing process is 100 min, the holding temperature is 120° C., the heating pressure is 310 kPa, and the vacuum degree is −90 kPa; the obtained molded product is subjected to a first post-treatment and a second post-treatment in sequence to obtain a composite material product having a wire-shaped cavity; the first post-treatment is an acid etching treatment and a stripping treatment; and the second post-treatment is an ultrasonic vibration treatment;

[0066] (3) machining, drying and edge-sealing the composite material product obtained in step (2), and then calibrating the actual width of the wire-shaped cavity using a X-ray method to obtain the composite material image quality meter.

[0067] The manufacturing accuracy of the obtained composite material image quality meter can reach 4μm and can be used in radiation detection technology.

[0068] Example 4

[0069] This embodiment provides a composite material image quality meter, which differs from Embodiment 1 in that the holding time in the curing molding in step (2) is adjusted to 70 minutes, the holding temperature is adjusted to 140° C., the heating pressure is adjusted to 290 kPa, and the vacuum degree is adjusted to −75 kPa. The rest is the same as Embodiment 1.

[0070] Since the curing and molding conditions exceed the limited range, the obtained composite material image quality meter has a small amount of pores and a delamination phenomenon.

[0071] Example 5

[0072] This embodiment provides a composite material image quality meter, which differs from Embodiment 1 in that the holding time in the curing molding in step (2) is adjusted to 110 min, the holding temperature is adjusted to 110° C., the heating pressure is adjusted to 320 kPa, and the vacuum degree is adjusted to −95 kPa. The rest is the same as Embodiment 1.

[0073] Since the curing conditions exceed the limited range, the obtained composite material image quality meter has a small amount of pores and a delamination phenomenon.

[0074] Example 6

[0075] This embodiment provides a composite material image quality meter, which differs from Embodiment 1 in that the first post-treatment in step (2) is adjusted to a single acid etching treatment, and the rest is the same as Embodiment 1.

[0076] The first post-treatment reduces the precipitation effect of the filament-type filler, and the filament-type filler cannot be completely separated from the composite material prepreg body, which has an adverse effect on the subsequently formed filament-type cavity.

[0077] Comparative Example 1

[0078] This comparative example provides a composite material image quality meter, which differs from Example 1 in that there is no first post-processing in step (2), and the rest is the same as Example 1.

[0079] If the first post-treatment is not provided, the precipitation effect of the filament filler will be significantly reduced, and it will not be able to be completely separated from the composite material prepreg body, which will have an adverse effect on the subsequently formed filament cavity, thereby affecting the quality of the composite material image quality meter.

[0080] Comparative Example 2

[0081] This comparative example provides a composite material image quality meter, which is different from Example 1 in that there is no second post-processing in step (2), and the rest is the same as Example 1.

[0082] If the second post-treatment is not provided, the precipitation effect of the filament filler will be significantly reduced, and it will not be able to be completely separated from the composite material prepreg body, which will have an adverse effect on the subsequently formed filament cavity, thereby affecting the quality of the composite material image quality meter.

[0083] In summary, the preparation method of the composite material image quality meter provided by the present invention pre-embeds the silk-type filler during the process of paving the composite material prepreg, and then separates the silk-type filler from the composite material prepreg through the first post-treatment and the second post-treatment to simulate discontinuity. Compared with the traditional preparation method that can only achieve an accuracy of 0.1 mm, the present invention can achieve controllable manufacturing of micron-level narrow and long cavities with high manufacturing accuracy; the preparation method can be used for the preparation of composite material image quality meters of different material systems, and has good versatility.

[0084] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention are within the protection scope and disclosure scope of the present invention.

Claims

1. A method for preparing a composite material image quality meter, characterized in that: The preparation method comprises the following steps: (1) Laying composite material prepreg according to the size requirements of the composite material image quality meter, and pre-embedding the silk-type filler to the target depth during the laying process; (2) curing and molding the composite material prepreg with the pre-embedded wire-shaped filler described in step (1), and sequentially performing a first post-treatment and a second post-treatment on the obtained molded product to obtain a composite material product having a wire-shaped cavity; (3) Drying and edge-sealing the composite material product obtained in step (2) to obtain the composite material image quality meter.

2. The preparation method according to claim 1, characterized in that: The composite material prepreg in step (1) includes a fiber-reinforced composite material prepreg.

3. The preparation method according to claim 1 or 2, characterized in that: The material and specification of the wire-type filler in step (1) are selected according to the size requirements, material and target sensitivity of the composite material image quality meter.

4. The preparation method according to claim 3, characterized in that: The material of the wire-type filler in step (1) includes metal wire or soluble fiber.

5. The preparation method according to any one of claims 1 to 4, characterized in that: The holding time in the curing molding of step (2) is 80-100 minutes; Preferably, the holding temperature in the curing molding in step (2) is 120-130°C; Preferably, the heating pressure in the curing molding in step (2) is 300-310 kPa; Preferably, the vacuum degree in the curing molding in step (2) is -80 kPa to -90 kPa.

6. The preparation method according to any one of claims 1 to 5, characterized in that: Step (2) The first post-treatment and the second post-treatment independently include chemical treatment and / or physical treatment.

7. The preparation method according to claim 6, characterized in that: Step (2) the first post-treatment is chemical treatment and physical treatment; Preferably, the second post-treatment in step (2) is a physical treatment; Preferably, the physical treatment includes at least one of a heating treatment, an ultrasonic vibration treatment or a stripping treatment; Preferably, the chemical treatment comprises acid etching treatment or alkali etching treatment.

8. The preparation method according to any one of claims 1 to 7, characterized in that: Step (3) also includes the step of machining the composite material part before the drying and edge sealing; Preferably, after the edge sealing in step (3), the step of calibrating the actual width of the wire cavity is also included; Preferably, the calibration method includes radiographic method or metallographic method; Preferably, if the calibration result is determined to not meet the quality requirements, step (1), step (2) and step (3) are repeated.

9. A composite material image quality meter, characterized in that: The composite material image quality meter is prepared by the preparation method according to any one of claims 1 to 8.

10. An application of the composite material image quality meter as claimed in claim 9, characterized in that: The composite material image quality meter is used in radiation detection.

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