Method for improving wear resistance of material based on laser shock peening technology

Abstract

The invention relates to the technical field of laser shock peening surface modification, and discloses a method for improving wear resistance of a material based on a laser shock peening technology. The method for improving the wear resistance of the material based on the laser shock peening technology comprises the following steps that (1) a composite absorption layer material is sprayed to the surface of the material to be strengthened to form an absorption layer, and then water is sprayed to the surface of the absorption layer to form a restraint layer; and (2) after the restraint layer in the step (1) is sprayed, the surface of the to-be-strengthened material is subjected to laser shock strengthening. According to the method for improving the wear resistance of the material based on the laser shock peening technology, excessive thermal damage and deformation can be effectively avoided, and meanwhile the wear resistance of the material can be effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of laser shock intensive surface modification, and in particular to a method for improving the wear resistance of a material based on the laser shock intensive technology. Background Art

[0002] Wear resistance refers to the degree to which a material is continuously reduced under the action of friction, wear and other forces. The wear resistance of a material is one of the important indicators for measuring the quality of a material, and has a vital impact on the service life, performance and quality of various mechanical equipment and industrial products. Therefore, how to improve the wear resistance of a material has become a research hotspot for those skilled in the art. Existing studies have found that appropriate surface treatment of the material surface can effectively improve the wear resistance of the material.

[0003] Laser shock peening technology is an emerging surface treatment technology that uses the plasma shock mechanics effect induced by a high-power density, low-pulse width laser beam to modify the material surface. Compared with traditional surface treatment technologies such as hardening and quenching, laser shock peening technology has almost no thermal effect on the material surface and has significant advantages such as cleanliness, environmental protection, high operating efficiency and strong controllability.

[0004] However, with the practical application of laser strengthening technology, when using laser strengthening technology to modify the material surface to improve the wear resistance of the material, a large amount of energy is required to generate the laser beam, and the energy of the laser beam has a certain spatial non-uniformity, which will cause excessive thermal damage and deformation on the material surface, which is not conducive to improving the wear resistance of the material.

[0005] Therefore, improving the laser strengthening technology and developing a laser strengthening technology solution that can effectively avoid excessive thermal damage and deformation while effectively improving the wear resistance of materials has become a technical problem that needs to be urgently solved by technical personnel in this field. Summary of the invention

[0006] The purpose of the present invention is to provide a method for improving the wear resistance of materials based on laser shock peening technology, which can effectively avoid excessive thermal damage and deformation, and at the same time can effectively improve the wear resistance of materials.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A method for improving the wear resistance of a material based on laser shock peening technology comprises the following steps:

[0009] 1) Spraying a composite absorption layer material onto the surface of the material to be strengthened to form an absorption layer, and then spraying water on the surface of the absorption layer to form a constraint layer;

[0010] 2) After the constrained layer is sprayed in step 1), the surface of the material to be strengthened is subjected to laser shock strengthening.

[0011] Furthermore, in step 1), the preparation method of the composite absorption layer material comprises the following steps: weighing each raw material according to the following parts by mass: 30-50 parts of modified silicon carbide, 5-10 parts of carbon powder, 2-3 parts of tungsten powder and 10-15 parts of binder, and then mixing the weighed raw materials to obtain the composite absorption layer material.

[0012] Furthermore, the method for preparing the modified silicon carbide comprises the following steps: sequentially performing calcination modification and silane coupling agent modification on silicon carbide to obtain the modified silicon carbide.

[0013] Furthermore, the calcination modification is specifically as follows: silicon carbide and silicon dioxide are mixed in a mass ratio of 5:1, and calcined at 400° C. for 30 minutes.

[0014] Furthermore, the modification of the silane coupling agent is specifically as follows: the calcined modified silicon carbide obtained in step 1) is added to vinyl triethoxy silane in a mass ratio of calcined modified silicon carbide to vinyl triethoxy silane of 1:1.2, stirred for reaction at 90°C for 3h, washed with acetone, and dried.

[0015] Furthermore, in step 1), the thickness of the absorption layer is 10 to 40 μm.

[0016] Furthermore, in step 1), the thickness of the constrained layer is 3 mm to 5 mm.

[0017] Furthermore, in step 2), the parameters of the laser shock peening are: laser wavelength 1078nm, pulse width 17ns, laser energy density 9.8GW / cm 2 , spot diameter 2mm, spot 50% overlap.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The present invention provides a method for improving the wear resistance of materials based on laser shock peening technology. By adopting a special composite absorption layer material to form an absorption layer and selecting a specific absorption layer thickness, excessive thermal damage and deformation during the shock peening process are effectively avoided, thereby effectively improving the wear resistance of the material. DETAILED DESCRIPTION

[0020] Now, various exemplary embodiments of the present invention are described in detail, and this detailed description should not be considered as a limitation of the present invention, but should be understood as a more detailed description of certain aspects, characteristics and embodiments of the present invention. It should be understood that the terms described in the present invention are only for describing specific embodiments and are not used to limit the present invention.

[0021] In addition, for the numerical range in the present invention, it is understood that each intermediate value between the upper and lower limits of the range is also specifically disclosed. Each smaller range between the intermediate value in any stated value or stated range and any other stated value or intermediate value in the range is also included in the present invention. The upper and lower limits of these smaller ranges can be independently included or excluded in the scope.

[0022] Unless otherwise indicated, all technical and scientific terms used herein have the same meanings as those generally understood by those skilled in the art. Although the present invention describes only preferred methods and materials, any methods and materials similar or equivalent to those described herein may also be used in the implementation or testing of the present invention. All documents mentioned in this specification are incorporated by reference to disclose and describe the methods and / or materials associated with the documents. In the event of a conflict with any incorporated document, the content of this specification shall prevail.

[0023] It will be apparent to those skilled in the art that various modifications and variations may be made to the specific embodiments of the present invention description without departing from the scope or spirit of the present invention. Other embodiments derived from the present invention description will be apparent to the skilled artisan. The present invention description and examples are exemplary only.

[0024] The words “include,” “including,” “have,” “contain,” etc. used in this document are open-ended terms, meaning including but not limited to.

[0025] In the following examples, the adhesive is purchased from GPM888 fast-drying epoxy polythiol adhesive produced by Guangzhou Green New Materials Co., Ltd.

[0026] In the following embodiment, a method for improving the wear resistance of a material based on laser shock peening technology comprises the following steps:

[0027] 1) mixing silicon carbide and silicon dioxide in a mass ratio of 5:1, calcining and modifying at 400° C. for 30 min to obtain calcined modified silicon carbide;

[0028] 2) adding the calcined modified silicon carbide obtained in step 1) into vinyl triethoxy silane in a mass ratio of calcined modified silicon carbide to vinyl triethoxy silane of 1:1.2, stirring and reacting at 90° C. for 3 h, washing with acetone, and drying to obtain modified silicon carbide;

[0029] 3) Weigh each raw material according to the following mass parts:

[0030] 30-50 parts of modified silicon carbide, 5-10 parts of carbon powder, 2-3 parts of tungsten powder and 10-15 parts of binder;

[0031] 4) mixing the raw materials weighed in step 3) to obtain a composite absorption layer material;

[0032] 5) spraying the composite absorption layer material obtained in step 4) onto the surface of the material to be strengthened to form an absorption layer with a thickness of 10 to 40 μm, and then spraying water on the surface of the absorption layer to form a constraint layer with a thickness of 3 to 5 mm;

[0033] 6) After the constrained layer is sprayed in step 5), laser shock strengthening is performed on the surface of the material to be strengthened;

[0034] The parameters of the laser shock peening are: laser wavelength 1078nm, pulse width 17ns, laser energy density 9.8GW / cm 2 , spot diameter 2mm, spot 50% overlap.

[0035] In the following embodiments, titanium alloy TC4 is used as an example for laser shock strengthening. Those skilled in the art can refer to the method described in the present invention to perform laser shock strengthening on any material to be strengthened.

[0036] Embodiments 1 to 5

[0037] A method for improving material wear resistance based on laser shock peening technology

[0038] 1) mixing silicon carbide and silicon dioxide in a mass ratio of 5:1, calcining and modifying at 400° C. for 30 min to obtain calcined modified silicon carbide;

[0039] 2) adding the calcined modified silicon carbide obtained in step 1) into vinyl triethoxy silane in a mass ratio of calcined modified silicon carbide to vinyl triethoxy silane of 1:1.2, stirring and reacting at 90° C. for 3 h, washing with acetone, and drying to obtain modified silicon carbide;

[0040] 3) Weigh each raw material according to the mass parts recorded in Table 1;

[0041] Table 1 Raw material ratio (parts)

[0042]

[0043]

[0044] 4) mixing the raw materials weighed in step 3) to obtain a composite absorption layer material;

[0045] 5) spraying the composite absorption layer material obtained in step 4) onto the surface of the titanium alloy TC4 to form an absorption layer with a thickness of 10 μm, and then spraying water on the surface of the absorption layer to form a constraint layer with a thickness of 3 mm;

[0046] 6) After the constrained layer spraying in step 5) is completed, the surface of the titanium alloy TC4 is laser shock strengthened;

[0047] The parameters of the laser shock peening are: laser wavelength 1078nm, pulse width 17ns, laser energy density 9.8GW / cm 2 , spot diameter 2mm, spot 50% overlap.

[0048] The wear resistance test of titanium alloy TC4 after laser shock strengthening in Examples 1 to 5 was carried out, and the wear resistance test results are shown in Table 2;

[0049] Table 2 Wear resistance test results

[0050]

[0051] It can be seen from the data in Table 2 that changing the amount of modified silicon carbide added in the composite absorption layer material will affect the wear resistance of titanium alloy TC4. Within the test range of 30 to 50 parts, the specific wear rate of titanium alloy TC4 shows a trend of first decreasing and then increasing, which indicates that the wear resistance of titanium alloy TC4 first increases and then decreases, and reaches the optimal wear resistance at 40 parts.

[0052] Embodiments 6 to 10

[0053] A method for improving material wear resistance based on laser shock peening technology

[0054] 1) mixing silicon carbide and silicon dioxide in a mass ratio of 5:1, calcining and modifying at 400° C. for 30 min to obtain calcined modified silicon carbide;

[0055] 2) adding the calcined modified silicon carbide obtained in step 1) into vinyl triethoxy silane in a mass ratio of calcined modified silicon carbide to vinyl triethoxy silane of 1:1.2, stirring and reacting at 90° C. for 3 h, washing with acetone, and drying to obtain modified silicon carbide;

[0056] 3) Weigh each raw material according to the mass parts recorded in Table 3;

[0057] Table 3 Raw material ratio (parts)

[0058]

[0059] 4) mixing the raw materials weighed in step 3) to obtain a composite absorption layer material;

[0060] 5) spraying the composite absorption layer material obtained in step 4) onto the surface of the titanium alloy TC4 to form an absorption layer with a thickness of 10 μm, and then spraying water on the surface of the absorption layer to form a constraint layer with a thickness of 3 mm;

[0061] 6) After the constrained layer spraying in step 5) is completed, the surface of the titanium alloy TC4 is laser shock strengthened;

[0062] The parameters of the laser shock peening are: laser wavelength 1078nm, pulse width 17ns, laser energy density 9.8GW / cm 2 , spot diameter 2mm, spot 50% overlap.

[0063] The wear resistance test of titanium alloy TC4 after laser shock strengthening in Examples 6 to 10 was carried out, and the wear resistance test results are shown in Table 4;

[0064] Table 4 Wear resistance test results

[0065]

[0066] It can be seen from the data in Table 4 that changing the amount of carbon powder added in the composite absorption layer material will affect the wear resistance of titanium alloy TC4. In the test range of 5 to 10 parts, the specific wear rate of titanium alloy TC4 shows a trend of first decreasing and then increasing, which indicates that the wear resistance of titanium alloy TC4 first increases and then decreases, and reaches the optimal wear resistance at 7 parts.

[0067] Examples 11-12

[0068] A method for improving material wear resistance based on laser shock peening technology

[0069] 1) mixing silicon carbide and silicon dioxide in a mass ratio of 5:1, calcining and modifying at 400° C. for 30 min to obtain calcined modified silicon carbide;

[0070] 2) adding the calcined modified silicon carbide obtained in step 1) into vinyl triethoxy silane in a mass ratio of calcined modified silicon carbide to vinyl triethoxy silane of 1:1.2, stirring and reacting at 90° C. for 3 h, washing with acetone, and drying to obtain modified silicon carbide;

[0071] 3) Weigh each raw material according to the mass parts recorded in Table 5;

[0072] Table 5 Raw material ratio (parts)

[0073]

[0074] 4) mixing the raw materials weighed in step 3) to obtain a composite absorption layer material;

[0075] 5) spraying the composite absorption layer material obtained in step 4) onto the surface of the titanium alloy TC4 to form an absorption layer with a thickness of 10 μm, and then spraying water on the surface of the absorption layer to form a constraint layer with a thickness of 3 mm;

[0076] 6) After the constrained layer spraying in step 5) is completed, the surface of the titanium alloy TC4 is laser shock strengthened;

[0077] The parameters of the laser shock peening are: laser wavelength 1078nm, pulse width 17ns, laser energy density 9.8GW / cm 2 , spot diameter 2mm, spot 50% overlap.

[0078] The wear resistance test of titanium alloy TC4 after laser shock strengthening in Examples 11 to 12 was performed, and the wear resistance test results are shown in Table 6;

[0079] Table 6 Wear resistance test results

[0080]

[0081] It can be seen from the data in Table 6 that changing the amount of tungsten powder added in the composite absorption layer material will affect the wear resistance of titanium alloy TC4. Within the test range of 2 to 3 parts, the specific wear rate of titanium alloy TC4 shows a trend of first decreasing and then increasing, which indicates that the wear resistance of titanium alloy TC4 first increases and then decreases, and reaches the optimal wear resistance at 2.5 parts.

[0082] Embodiments 13-14

[0083] A method for improving material wear resistance based on laser shock peening technology

[0084] 1) mixing silicon carbide and silicon dioxide in a mass ratio of 5:1, calcining and modifying at 400° C. for 30 min to obtain calcined modified silicon carbide;

[0085] 2) adding the calcined modified silicon carbide obtained in step 1) into vinyl triethoxy silane in a mass ratio of calcined modified silicon carbide to vinyl triethoxy silane of 1:1.2, stirring and reacting at 90° C. for 3 h, washing with acetone, and drying to obtain modified silicon carbide;

[0086] 3) Weigh each raw material according to the mass parts recorded in Table 7;

[0087] Table 7 Raw material ratio (parts)

[0088]

[0089] 4) mixing the raw materials weighed in step 3) to obtain a composite absorption layer material;

[0090] 5) spraying the composite absorption layer material obtained in step 4) onto the surface of the titanium alloy TC4 to form an absorption layer with a thickness of 10 μm, and then spraying water on the surface of the absorption layer to form a constraint layer with a thickness of 3 mm;

[0091] 6) After the constrained layer spraying in step 5) is completed, the surface of the titanium alloy TC4 is laser shock strengthened;

[0092] The parameters of the laser shock peening are: laser wavelength 1078nm, pulse width 17ns, laser energy density 9.8GW / cm 2 , spot diameter 2mm, spot 50% overlap.

[0093] The wear resistance test of titanium alloy TC4 after laser shock strengthening in Examples 13 to 14 was performed, and the wear resistance test results are shown in Table 8;

[0094] Table 8 Wear resistance test results

[0095]

[0096] It can be seen from the data in Table 8 that changing the amount of binder added in the composite absorption layer material will not affect the wear resistance of titanium alloy TC4.

[0097] Comparative Example 1

[0098] A method for improving material wear resistance based on laser shock peening technology

[0099] 1) mixing silicon carbide and silicon dioxide in a mass ratio of 5:1, calcining and modifying at 400° C. for 30 min to obtain modified silicon carbide;

[0100] 2) Weigh each raw material according to the following mass parts:

[0101] 40 parts of modified silicon carbide, 7 parts of carbon powder, 2.5 parts of tungsten powder and 10 parts of binder;

[0102] 3) mixing the raw materials weighed in step 2) to obtain a composite absorption layer material;

[0103] 4) spraying the composite absorption layer material obtained in step 3) onto the surface of the titanium alloy TC4 to form an absorption layer with a thickness of 10 μm, and then spraying water on the surface of the absorption layer to form a constraint layer with a thickness of 3 mm;

[0104] 5) After the constrained layer spraying in step 4) is completed, the surface of the titanium alloy TC4 is laser-shock-hardened;

[0105] The parameters of the laser shock peening are: laser wavelength 1078nm, pulse width 17ns, laser energy density 9.8GW / cm 2 , spot diameter 2mm, spot 50% overlap.

[0106] The wear resistance of the titanium alloy TC4 after laser shock strengthening in Example 1 was tested. The specific wear rate of the titanium alloy TC4 after laser shock strengthening in Example 1 was 2.9×10 -4 mm 3 ·N -1 ·m -1 .

[0107] Comparative Example 2

[0108] A method for improving material wear resistance based on laser shock peening technology

[0109] 1) adding silicon carbide to vinyl triethoxy silane in a mass ratio of 1:1.2, stirring and reacting at 90°C for 3 hours, washing with acetone, and drying to obtain modified silicon carbide;

[0110] 2) Weigh each raw material according to the following mass parts:

[0111] 40 parts of modified silicon carbide, 7 parts of carbon powder, 2.5 parts of tungsten powder and 10 parts of binder;

[0112] 3) mixing the raw materials weighed in step 2) to obtain a composite absorption layer material;

[0113] 4) spraying the composite absorption layer material obtained in step 3) onto the surface of the titanium alloy TC4 to form an absorption layer with a thickness of 10 μm, and then spraying water on the surface of the absorption layer to form a constraint layer with a thickness of 3 mm;

[0114] 5) After the constrained layer spraying in step 4) is completed, the surface of the titanium alloy TC4 is laser shock strengthened;

[0115] The parameters of the laser shock peening are: laser wavelength 1078nm, pulse width 17ns, laser energy density 9.8GW / cm 2 , spot diameter 2mm, spot 50% overlap.

[0116] The wear resistance of the titanium alloy TC4 after laser shock strengthening in Example 2 was tested. The specific wear rate of the titanium alloy TC4 after laser shock strengthening in Example 2 was 3.1×10 -4 mm 3 ·N -1 ·m -1 .

[0117] Embodiments 15 to 19

[0118] 1) mixing silicon carbide and silicon dioxide in a mass ratio of 5:1, calcining and modifying at 400° C. for 30 min to obtain calcined modified silicon carbide;

[0119] 2) adding the calcined modified silicon carbide obtained in step 1) into vinyl triethoxy silane in a mass ratio of calcined modified silicon carbide to vinyl triethoxy silane of 1:1.2, stirring and reacting at 90° C. for 3 h, washing with acetone, and drying to obtain modified silicon carbide;

[0120] 3) Weigh each raw material according to the following mass parts:

[0121] 40 parts of modified silicon carbide, 7 parts of carbon powder, 2.5 parts of tungsten powder and 10 parts of binder;

[0122] 4) mixing the raw materials weighed in step 3) to obtain a composite absorption layer material;

[0123] 5) spraying the composite absorption layer material obtained in step 4) onto the surface of the titanium alloy TC4 to form an absorption layer, and then spraying water on the surface of the absorption layer to form a constraint layer;

[0124] Among them, the thickness of the absorption layer and the constraint layer are shown in Table 9;

[0125] 6) After the constrained layer spraying in step 5) is completed, the surface of the titanium alloy TC4 is laser shock strengthened;

[0126] The parameters of the laser shock peening are: laser wavelength 1078nm, pulse width 17ns, laser energy density 9.8GW / cm 2 , spot diameter 2mm, spot 50% overlap.

[0127] Table 9 Thickness of the absorbing layer and the constraining layer

[0128]

[0129] The wear resistance test of titanium alloy TC4 after laser shock strengthening in Examples 15 to 19 was carried out, and the wear resistance test results are shown in Table 10;

[0130] Table 10 Wear resistance test results

[0131]

[0132] It can be seen from the data in Table 10 that the thickness of the absorption layer will affect the wear resistance of titanium alloy TC4. In the test range of 10 to 40 μm, the specific wear rate of titanium alloy TC4 shows a trend of first decreasing and then increasing, which indicates that the wear resistance of titanium alloy TC4 first increases and then decreases, reaching the optimal wear resistance at 30 μm; while the thickness of the constraint layer will not affect the wear resistance of titanium alloy TC4.

[0133] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for improving the wear resistance of materials based on laser shock peening technology, characterized in that: The following steps are involved: 1) Spraying a composite absorption layer material onto the surface of the material to be strengthened to form an absorption layer, and then spraying water on the surface of the absorption layer to form a constraint layer; 2) After the constrained layer is sprayed in step 1), the surface of the material to be strengthened is subjected to laser shock strengthening.

2. The method for improving material wear resistance based on laser shock peening technology according to claim 1, characterized in that: In step 1), the preparation method of the composite absorption layer material comprises the following steps: weighing each raw material according to the following mass parts: 30-50 parts of modified silicon carbide, 5-10 parts of carbon powder, 2-3 parts of tungsten powder and 10-15 parts of binder, and then mixing the weighed raw materials to obtain the composite absorption layer material.

3. The method for improving material wear resistance based on laser shock peening technology according to claim 2, characterized in that: The method for preparing the modified silicon carbide comprises the following steps: sequentially performing calcination modification and silane coupling agent modification on silicon carbide to obtain the modified silicon carbide.

4. The method for improving material wear resistance based on laser shock peening technology according to claim 3 is characterized in that: The calcination modification specifically includes: mixing silicon carbide and silicon dioxide at a mass ratio of 5:1, and calcining and modifying at 400° C. for 30 minutes.

5. The method for improving material wear resistance based on laser shock peening technology according to claim 3, characterized in that: The silane coupling agent modification is specifically as follows: the calcined modified silicon carbide obtained in step 1) is added to vinyl triethoxy silane in a mass ratio of calcined modified silicon carbide to vinyl triethoxy silane of 1:1.2, stirred for reaction at 90°C for 3h, washed with acetone, and dried.

6. The method for improving material wear resistance based on laser shock peening technology according to claim 1, characterized in that: In step 1), the thickness of the absorption layer is 10 to 40 μm.

7. The method for improving material wear resistance based on laser shock peening technology according to claim 1, characterized in that: In step 1), the thickness of the constrained layer is 3 mm to 5 mm.

8. The method for improving material wear resistance based on laser shock peening technology according to claim 1, characterized in that: In step 2), the parameters of the laser shock peening are: laser wavelength 1078nm, pulse width 17ns, laser energy density 9.8GW / cm 2 , spot diameter 2mm, spot 50% overlap.

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