Metal surface ceramic particle wear-resistant coating based on ultrasonic peening process and preparation method of metal surface ceramic particle wear-resistant coating

Abstract

The invention provides a method for preparing a ceramic / metal-based wear-resistant coating by adopting an ultrasonic peening process. The method comprises the following steps: carrying out rust removal and oil removal pretreatment on a substrate, and mounting and positioning; carrying out drying treatment on the ceramic powder for 30-40 minutes under the condition of 70-100 DEG C; the step is used for ensuring that the surface of the ceramic powder does not contain moisture; the dried ceramic powder is placed on the surface of a base body, an ultrasonic peening gun head is moved to the position above the surface of the base body, and high-speed ultrasonic peening is conducted on the base body; and after ultrasonic peening processing is finished, residual ceramic powder on the surface of the coating is cleaned with absolute ethyl alcohol, and the wear-resistant coating prepared through the ultrasonic peening process is obtained after cleaning and airing. According to the method, the non-thermal stress of the ultrasonic peening technology is fully utilized, and high-efficiency and high-quality manufacturing of the ceramic / metal-based wear-resistant coating is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of metal material surface treatment, and in particular to a metal surface ceramic particle wear-resistant coating based on an ultrasonic impact process and a preparation method thereof. Background Art

[0002] With the rapid development of industry, higher requirements are put forward for high-end manufacturing, especially for industries with high requirements for wear resistance, such as automobiles, ships, mining and heavy machinery. In the field of high-end manufacturing, the surface performance of parts directly affects the performance and service life of the products. The wear of equipment parts often causes additional time and economic cost losses. In order to improve the surface performance of mechanical parts, surface strengthening treatment and high wear-resistant coating are usually used to improve the surface performance and service life of the material.

[0003] Metal-ceramic composite coatings combine the good toughness of metal materials with the high strength of ceramic materials. Preparing a layer of ceramic composite coating on the surface of parts can play a good protective role.

[0004] However, the research on the preparation of metal-ceramic composite coatings using traditional surface modification technology still has the following problems. (1) Severe tensile stress is generated inside the prepared metal-ceramic composite coating, which makes the working part of the coating prone to cracks. (2) During the preparation of the composite coating, the gas in the liquid melt fails to escape from the solid-liquid surface in time after being generated, and then remains in the cladding layer to form pores. Summary of the invention

[0005] In view of the defects existing in the prior art, the purpose of the present invention is to provide a method for preparing a ceramic / metal-based composite coating by ultrasonic impact. This method directly uses pure ceramic powder as material, controls the thickness of the composite coating by adjusting the ultrasonic impact process parameters, and then prepares a new ceramic / metal-based composite coating on the metal base surface.

[0006] In order to achieve the above object, the present invention provides a method for preparing a ceramic-based composite coating by using a high-speed ultrasonic impact process, comprising the following steps:

[0007] Step 1: pre-treat the substrate by removing rust and oil, and then install and position it;

[0008] Step 2: Dry the ceramic powder at 70-100°C for 30-40 minutes; this step is to ensure that the surface of the ceramic powder is free of moisture;

[0009] Step 3: Place the dried ceramic powder on the surface of the substrate, move the ultrasonic impact gun tip to the surface of the substrate, and perform high-speed ultrasonic impact on the substrate;

[0010] Step 4: After the ultrasonic impact processing is completed, the residual ceramic powder on the surface of the coating is cleaned with anhydrous ethanol, and then dried to obtain a wear-resistant coating prepared by the ultrasonic impact process.

[0011] Among them, the process parameters of ultrasonic impact are: impact frequency 20KHz.

[0012] As mentioned above, the ceramic powder includes TiC and WC.

[0013] As mentioned above, the substrate is a copper-based alloy, an aluminum alloy, and an iron-based alloy.

[0014] The particle size of the TiC ceramic powder is 0-325 mesh, and the particle size of the WC ceramic powder is 270-525 mesh.

[0015] As described above, the rust removal and degreasing process described in step 1 is: polish the substrate with #200, #400, #600, #800 and #1000 sandpaper in turn, and then use acetone ultrasonic cleaning to remove surface oil and impurities for 3 minutes; ultrasonic cleaning in anhydrous ethanol for 3 minutes to remove acetone residue on the surface of the substrate.

[0016] Beneficial effects of the present invention:

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: compared with the existing conventional surface modification technology, the ceramic / metal-based wear-resistant coating prepared by this technology abandons the traditional method of mixing metal and ceramic powder, directly uses pure ceramic powder, and uses the impact force of the ultrasonic impact gun head to combine the ceramic powder with the matrix; the wear resistance of the ceramic / metal-based wear-resistant coating prepared by this technology is significantly improved; there are no pore defects and through-crack defects caused by heat processing in the coating; by adjusting the ultrasonic impact process parameters, the depth of the ceramic powder entering the matrix is ​​controlled to finally form a coating structure. The coating-matrix bonding interface formed presents a perfect combination, and the top of the coating exhibits excellent wear resistance at both room temperature and high temperature. The method has a simple process and simple materials and is easy to implement. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Cross-sectional optical microscopy image of sample 1

[0019] Figure 2 Cross-sectional optical microscopy image of sample 2

[0020] Figure 3 Cross-sectional optical microscopy image of sample 3 DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0022] The embodiments of the present invention are further described in detail below with reference to the accompanying drawings.

[0023] Material:

[0024] 1. TiC ceramic powder was purchased from Shenyang Rare Metal Research Institute, with a particle size of 0-325 μm.

[0025] 2. The ultrasonic impact equipment (equipped with an impact gun head) was purchased from Hangzhou Supersonic Electromechanical Technology Co., Ltd. The equipment model of the ultrasonic impact equipment is: CYS-C20.

[0026] Example 1 Preparation of TiC / Tin Bronze Composite Coating

[0027] 1. Use sandpaper to polish the surface of the 100×100×5mm tin bronze plate to be impacted, and then perform rust and oil removal pretreatment: specifically: use #200, #400, #600, #800 and #1000 sandpaper to polish the substrate in turn until there are no major scratches, and then use acetone ultrasonic cleaning to remove surface oil and impurities for 3 minutes; put it in anhydrous ethanol for ultrasonic cleaning for 3 minutes to remove acetone residue on the surface of the tin bronze plate.

[0028] 2. Place the tin bronze plate into the fixture for positioning and clamping.

[0029] 3. Dry the TiC ceramic powder with a particle size of 0-325 mesh at 90° C. for 30 minutes to ensure that the surface of the TiC ceramic powder is free of moisture.

[0030] 4. Pour the TiC ceramic powder onto the tin bronze substrate clamped in the fixture.

[0031] 5. Move the ultrasonic impact gun tip onto the TiC powder, turn on the ultrasonic impact equipment, and perform the ultrasonic impact process; and prepare sample 1.

[0032] Example 2 Preparation of WC / Tin Bronze Composite Coating

[0033] 1. Use sandpaper to polish the surface of the 100×100×5mm tin bronze plate to be impacted, and then perform rust and oil removal pretreatment: specifically: use #200, #400, #600, #800 and #1000 sandpaper to polish the substrate in turn until there are no major scratches, and then use acetone ultrasonic cleaning to remove surface oil and impurities for 3 minutes; put it in anhydrous ethanol for ultrasonic cleaning for 3 minutes to remove acetone residue on the surface of the tin bronze plate.

[0034] 2. Place the tin bronze plate into the fixture for positioning and clamping.

[0035] 3. Dry the WC ceramic powder with a particle size of 270-525 mesh at 90°C for 30 minutes to ensure that the surface of the WC ceramic powder is free of moisture.

[0036] 4. Pour the WC ceramic powder onto the tin bronze substrate clamped in the fixture.

[0037] 5. Move the ultrasonic impact gun tip onto the WC powder, turn on the ultrasonic impact equipment, and perform the ultrasonic impact process; produce sample 2.

[0038] Example 3 Preparation of TiC / Aluminum Alloy Composite Coating

[0039] 1. Use sandpaper to polish the surface of the 100×100×5mm aluminum alloy plate to be impacted, and then perform rust and oil removal pretreatment: specifically: use #200, #400, #600, #800 and #1000 sandpaper to polish the substrate in turn until there are no major scratches, and then use acetone ultrasonic cleaning to remove surface oil and impurities for 3 minutes; put it in anhydrous ethanol for ultrasonic cleaning for 3 minutes to remove acetone residue on the surface of the aluminum alloy plate.

[0040] 2. Place the aluminum alloy plate into the fixture for positioning and clamping.

[0041] 3. Dry the TiC ceramic powder with a particle size of 0-325 mesh at 90° C. for 30 minutes to ensure that the surface of the TiC ceramic powder is free of moisture.

[0042] 4. Pour the TiC ceramic powder onto the aluminum alloy substrate clamped in the fixture.

[0043] 5. Move the ultrasonic impact gun tip onto the TiC powder, turn on the ultrasonic impact equipment, and perform the ultrasonic impact process; and prepare sample 3.

[0044] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0045] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A method for preparing a ceramic / metal-based wear-resistant coating using an ultrasonic impact process, characterized in that: The ceramic / metal-based wear-resistant coating is prepared by ultrasonic impact cold working, which specifically includes the following steps: Step 1: pre-treat the substrate by removing rust and oil, and then install and position it; Step 2, drying the ceramic powder at 70-100° C. for 30-40 minutes; This step is used to ensure that the surface of the ceramic powder is free of moisture; Step 3: Place the dried ceramic powder on the surface of the substrate, move the ultrasonic impact gun tip to the surface of the substrate, and perform high-speed ultrasonic impact on the substrate; Step 4: After the ultrasonic impact processing is completed, the residual ceramic powder on the surface of the coating is cleaned with anhydrous ethanol, and then dried to obtain a wear-resistant coating prepared by the ultrasonic impact process.

2. The method for preparing a ceramic / metal-based wear-resistant coating by ultrasonic impact technology according to claim 1, characterized in that The ceramic powder includes TiC and WC.

3. The method for preparing a ceramic / metal-based wear-resistant coating by ultrasonic impact technology according to claim 1, characterized in that The matrix is ​​a copper-based alloy, an aluminum alloy and an iron-based alloy.

4. The TiC ceramic powder according to claim 2 has a particle size of 0-325 mesh, and the WC ceramic powder has a particle size of 270-525 mesh.

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