Wear-resistant and corrosion-resistant laser cladding layer for sliding shoe of coal mining machine and preparation method of wear-resistant and corrosion-resistant laser cladding layer

Abstract

The invention belongs to the technical field of laser cladding. The invention provides a wear-resistant component, a laser cladding layer and a preparation method thereof. The wear-resistant part comprises a base body and a cladding layer located on at least part of the surface of the base body, the cladding layer comprises a C element, an O element, a B element, a Si element, a Cr element, a Fe element and a Ni element, and the base body comprises a coal cutter sliding shoe. The cladding layer has high corrosion resistance and high abrasion resistance, and the abrasion resistance of the abrasion-resistant component can be improved. And the cladding layer and the base body are metallurgically bonded, so that the cladding layer and the base body have good bonding force, and layer sliding is not prone to occurring.

Description

Technical Field

[0001] The present application relates to the technical field of laser cladding, and in particular to a wear-resistant component, a laser cladding layer and a preparation method thereof. Background Art

[0002] The service reliability and life of the shearer's skids seriously affect the efficiency of coal seam mining and the economic benefits of mining companies. In actual production, the underground environment is extremely harsh (high pressure, humidity and a lot of dust). In addition, the shearer itself is very heavy. During operation, the dynamic load borne by its roller will be transmitted to the skids, causing the shearer's skids to be subjected to complex alternating loads, which will cause wear, corrosion and even fracture. In addition, the working space of the skids is small, it is inconvenient to disassemble and assemble, and the replacement cost is high. Once a failure causes a shutdown, it will cause huge economic losses. How to improve the wear and corrosion resistance of the skids and significantly extend their service life has become a major problem faced in coal mining.

[0003] At present, the main protective measures used for coal mining machine sliding shoes are substrate surface quenching, surfacing wear-resistant electrodes and welding wear-resistant plates. The medium-frequency quenching hardened layer is deep, but the hardness distribution is uneven, and quenching cracks are easy to occur; while the high-frequency quenching hardness is high and evenly distributed, but the hardened layer is shallow. The surface of the wear-resistant electrode surfacing is rough and needs to be processed again before use. The processing cycle is long and the actual use does not meet the standards; after the wear-resistant plate is welded, the hardness value drops significantly, resulting in the non-wear resistance of the sliding shoe guide surface. The above technical means cannot meet the requirements of high-power coal mining machines for the wear resistance and corrosion resistance of sliding shoes.

[0004] It should be noted that the above content is not necessarily prior art, nor is it intended to limit the scope of patent protection of this application. Summary of the invention

[0005] The embodiments of the present application provide a wear-resistant component, a laser cladding layer and a preparation method thereof to solve or alleviate one or more of the technical problems raised above.

[0006] A first aspect of an embodiment of the present application provides a wear-resistant component, which includes a substrate and a cladding layer located on at least a portion of the surface of the substrate, the cladding layer includes C elements, O elements, B elements, Si elements, Cr elements, Fe elements and Ni elements, and the substrate includes a coal mining machine shoe.

[0007] The wear-resistant component of the embodiment of the present application includes a substrate and a cladding layer located on at least part of the surface of the substrate, the substrate includes a coal mining machine shoe, and the cladding layer includes C element, O element, B element, Si element, Cr element, Fe element and Ni element. The cladding layer has strong corrosion resistance and high wear resistance, which helps to improve the wear resistance of the wear-resistant component. The cladding layer and the substrate are metallurgically bonded, so that the cladding layer and the substrate have good bonding force and are not easy to slip.

[0008] According to an embodiment of the present application, the cladding layer includes the following components in percentage by mass:

[0009] C: 0.80%~0.90%, O: 0.03%~0.04%, B: 3.20%~3.55%, Si: 3.92%~4.00%, Cr: 15.00%~16.32%, Fe: 7.84%~8.00%, and the balance is Ni.

[0010] According to an embodiment of the present application, the material of the coal mining machine sliding shoe includes at least one of 35CrMo, 35CrMoV, 35CrMnSi, 42CrMo, and 25Cr3Mo.

[0011] According to an embodiment of the present application, the thickness of the cladding layer is 2-6 mm.

[0012] A second aspect of an embodiment of the present application provides a method for preparing a cladding layer of a coal mining machine shoe.

[0013] The following steps are involved:

[0014] Providing a shearer skid shoe as a base;

[0015] The alloy powder is fed into the laser action zone by a synchronous powder feeding method for laser cladding, so that the alloy powder for laser cladding is melted on the surface of the substrate to form a cladding layer.

[0016] The cladding layer includes C element, O element, B element, Si element, Cr element, Fe element and Ni element.

[0017] The laser cladding method is used to form a cladding layer on the surface of the substrate, which can form a close metallurgical bond between the cladding layer and the substrate. Secondly, the cladding layer prepared by the laser cladding method is dense, which helps to improve the wear resistance of the coal mining machine sliding shoe.

[0018] According to an embodiment of the present application, the cladding layer includes the following components, in mass percentage: C: 0.80% to 0.90%, O: 0.03% to 0.04%, B: 3.20% to 3.55%, Si: 3.92% to 4.00%, Cr: 15.00% to 16.32%, Fe: 7.84% to 8.00%, and the balance is Ni.

[0019] According to an embodiment of the present application, the material of the coal mining machine sliding shoe includes at least one of 35CrMo, 35CrMoV, 35CrMnSi, 42CrMo, and 25Cr3Mo.

[0020] According to an embodiment of the present application, when performing the laser cladding, the laser cladding parameters set include laser power LP, scanning speed SS, powder feeding rate PFR, spot diameter BD and overlap rate OR, and the laser cladding parameters are obtained by solving the laser cladding parameter model, and the laser cladding parameter model includes:

[0021]

[0022] Wherein, T is the thickness of the cladding layer; H is the Vickers hardness of the cladding layer.

[0023] According to an embodiment of the present application, based on the laser cladding parameter model, optimized laser cladding parameters are obtained;

[0024] The laser cladding parameters include laser power LP of 1200-1600W, scanning speed SS1000-1600 mm / min, powder feeding speed PFR of 2-7g / min, spot diameter BD of 3-7mm, and overlap rate OR of 0.4-1.6.

[0025] According to an embodiment of the present application, before performing the laser cladding, the method further includes: preheating the shearer shoe, and the preheating temperature is 200-300°C.

[0026] According to an embodiment of the present application, the method further includes: performing a cooling treatment on the product obtained after the laser cladding, wherein the cooling treatment is performed in insulating sand.

[0027] According to an embodiment of the present application, the hardness of the cladding layer is not less than 800 HV. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in the present application and should not be regarded as limiting the scope of the present application.

[0029] Figure 1 is the surface / cross-sectional morphology of the cladding layer of Example 1;

[0030] Figure 2 is the worn surface morphology before and after cladding of test case 1;

[0031] Figure 3 This is the corrosion and wear cross-section morphology of test case 2 before and after cladding;

[0032] Figure 4 The wear surface morphology of test example 3 before and after cladding

[0033] Figure 5These are the worn surfaces before and after cladding of Test Example 4. DETAILED DESCRIPTION

[0034] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings. In the accompanying drawings, for clarity, the sizes of layers, regions, elements and their relative sizes may be exaggerated. Wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limitations on the present application. It should be noted that, in the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0035] It should be understood that when an element or layer is referred to as "on ...", "adjacent to ...", "connected to" or "coupled to" other elements or layers, it can be directly on, adjacent to, connected to or coupled to other elements or layers, or there can be intervening elements or layers. On the contrary, when an element is referred to as "directly on ...", "directly adjacent to ...", "directly connected to" or "directly coupled to" other elements or layers, there is no intervening element or layer. It should be understood that although the terms first, second, third, etc. can be used to describe various elements, components, regions, layers and / or parts, these elements, components, regions, layers and / or parts should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or part from another element, component, region, layer or part. Therefore, without departing from the teachings of the present application, the first element, component, region, layer or part discussed below can be represented as the second element, component, region, layer or part. When the second element, component, region, layer or part is discussed, it does not indicate that the present application necessarily has the first element, component, region, layer or part.

[0036] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0037] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0038] In the present application, when it comes to a numerical interval (i.e., a numerical range), unless otherwise specified, the distribution of the optional numerical values ​​in the numerical interval is considered to be continuous, and includes the two numerical endpoints (i.e., the minimum and maximum values) of the numerical interval, and each numerical value between the two numerical endpoints. Unless otherwise specified, when the numerical interval only refers to an integer in the numerical interval, it includes the two endpoint integers of the numerical range, and each integer between the two endpoints, which is equivalent to directly listing each integer. When multiple numerical ranges are provided to describe features or characteristics, these numerical ranges can be merged. In other words, unless otherwise specified, the numerical range disclosed in the present application should be understood to include any and all sub-ranges included therein. The "numerical value" in the numerical interval can be any quantitative value, such as a number, a percentage, a ratio, etc. "Numerical interval" allows for broadly including quantitative intervals such as percentage intervals, ratio intervals, and ratio intervals.

[0039] The embodiment of the present application provides an alloy powder for laser cladding, a laser cladding layer and a preparation method thereof. Based on this, the wear resistance and corrosion resistance of the shearer shoe are improved, as described in detail below.

[0040] A first aspect of an embodiment of the present application provides a wear-resistant component, which includes a cladding layer that is basically located on at least a portion of the surface of a substrate, the cladding layer includes C elements, O elements, B elements, Si elements, Cr elements, Fe elements and Ni elements, and the substrate includes a coal mining machine shoe.

[0041] The wear-resistant component of the embodiment of the present application includes a substrate and a cladding layer located on at least part of the surface of the substrate, the substrate includes a coal mining machine shoe, and the cladding layer includes C element, O element, B element, Si element, Cr element, Fe element and Ni element. The cladding layer has strong corrosion resistance and high wear resistance, which helps to improve the wear resistance of the wear-resistant component. The cladding layer and the substrate are metallurgically bonded, so that the cladding layer and the substrate have good bonding force and are not easy to slip.

[0042] The cladding layer is a protective layer for the substrate. The selection of cladding layer elements is based on the following: Mine water is highly corrosive, so Ni and Cr are selected as the main elements of the cladding layer to ensure its corrosion resistance. In addition, C and Cr elements will form a hard chromium carbide ceramic phase during the cladding process, which will enhance the wear resistance of the cladding layer. The B element can improve the grain boundary structure of the cladding layer, enhance its strength and corrosion resistance. The Si element is beneficial to improving the strength of the cladding layer. The Fe element is beneficial to improving the thermal conductivity of the cladding layer. The O element content is very low, which is caused by the oxidation of elements during the cladding process.

[0043] In some embodiments, the cladding layer includes the following components C: 0.80% to 0.90%, O: 0.03% to 0.04%, B: 3.20% to 3.55%, Si: 3.92% to 4.00%, Cr: 15.00% to 16.32%, Fe: 7.84% to 8.00%, and the balance is Ni, in terms of mass percentage. These component ratios are conducive to the formation of chromium carbide ceramic phases and enhance the wear resistance of the cladding layer.

[0044] The substrate is a shearer shoe, and the material of the shearer shoe includes at least one of 35CrMo, 35CrMoV, 35CrMnSi, 42CrMo, and 25Cr3Mo. The material of the shearer shoe forms a metallurgical bond with the cladding layer, which helps to improve the wear resistance of the shearer shoe.

[0045] Furthermore, the material of the coal mining machine sliding shoe is 25Cr3Mo.

[0046] In some embodiments, a thicker cladding layer is more conducive to enhancing the wear resistance of the substrate, but an excessively thick cladding layer may cause microcracks in the cladding layer, affecting the service performance of the cladding layer. Therefore, it is particularly important that the thickness of the cladding layer is controllable.

[0047] Optionally, the thickness of the cladding layer is 2-6 mm, for example, 2 mm, 4 mm, 5 mm, 6 mm.

[0048] In some embodiments, the hardness of the cladding layer is not less than 800 HV, such as 800, 900, 1200, 1500, etc. This can further improve the wear resistance of the substrate.

[0049] Optionally, the hardness of the cladding layer is 800-1500 HV.

[0050] A second aspect of an embodiment of the present application provides a method for preparing a cladding layer of a coal mining machine shoe.

[0051] In some embodiments, the method for preparing the cladding layer of the coal mining machine shoe comprises the following steps: S1 providing a coal mining machine shoe as a substrate; S2 using a synchronous powder feeding method to feed alloy powder into a laser action zone for laser cladding, so that the alloy powder for laser cladding melts on the surface of the substrate to form a cladding layer, wherein the cladding layer comprises C element, O element, B element, Si element, Cr element, Fe element and Ni element.

[0052] The laser cladding method is used to form a cladding layer on the surface of the substrate, which can form a close metallurgical bond between the cladding layer and the substrate. Secondly, the cladding layer prepared by the laser cladding method is dense, which helps to improve the wear resistance of the coal mining machine sliding shoe.

[0053] In S1, a shearer shoe is provided as a base.

[0054] In some embodiments, the shearer shoe is preheated; thereby, preheating can prevent cracks from appearing in the cladding layer;

[0055] Optionally, the preheating temperature is 200°C to 300°C, for example, 200°C, 250°C, 300°C, etc.

[0056] Optionally, the material of the coal mining machine sliding shoe includes at least one of 35CrMo, 35CrMoV, 35CrMnSi, 42CrMo, and 25Cr3Mo.

[0057] S2 uses a synchronous powder feeding method to feed alloy powder into the laser action zone for laser cladding, so that the alloy powder for laser cladding melts on the surface of the substrate to form a cladding layer.

[0058] The cladding layer includes C element, O element, B element, Si element, Cr element, Fe element and Ni element, thereby forming a cladding layer with wear resistance and corrosion resistance.

[0059] In some embodiments, in step S2, when performing the laser cladding, the laser cladding parameters set include laser power LP, scanning speed SS, powder feeding rate PFR, spot diameter BD and overlap rate OR, and the laser cladding parameters are obtained by solving a laser cladding parameter model, and the laser cladding parameter model includes:

[0060]

[0061] Wherein, T is the thickness of the cladding layer; H is the Vickers hardness of the cladding layer.

[0062] In some embodiments, a method for preparing a cladding layer of a shearer shoe, the method for establishing the laser cladding parameter model is:

[0063] Different combinations of laser cladding process parameters were selected as experimental variables, and alloy powder cladding experiments were carried out.

[0064] The laser cladding process parameters include laser power, scanning speed, powder feeding rate, overlap rate and spot diameter (input variables).

[0065] A response parameter set of the cladding layer is obtained, wherein the cladding layer response parameters include the cladding layer thickness and the cladding layer hardness (output response).

[0066] The test value pools (continuous parameter ranges) of the laser power, the scanning speed, the powder feeding rate, the overlap rate and the spot diameter are established respectively:

[0067] Wherein, the test value range of the laser power is 1400W~1600W;

[0068] The test value range of the scanning speed is 600 mm / min to 1200 mm / min;

[0069] The test value range of the powder feeding rate is 2g / min to 4g / min;

[0070] The test value range of the overlap ratio is 40% to 60%;

[0071] The experimental numerical range of the light spot diameter is 3mm-5mm.

[0072] Laser cladding process parameter model (model establishment):

[0073] The model design process considers the main effects of each factor and the quadratic interaction effects, where the estimability of the intercept and main effects is set to "necessary" and the estimability of the interaction effect is set to "if possible". This allows the number of experiments to be minimized while estimating as many two-factor interactions as possible.

[0074] The model terms include: main effects (scanning speed, laser power, powder feeding rate, overlap rate, spot diameter), two-factor interaction effects (scanning speed*laser power, scanning speed*powder feeding rate, scanning speed*overlap rate, scanning speed*spot diameter, laser power*powder feeding rate, laser power*overlap rate, laser power*spot diameter, powder feeding rate*overlap rate, powder feeding rate*spot diameter, overlap rate*spot diameter).

[0075] (Test results and model fitting) According to the model, different parameter combination tests were designed. Based on the cladding response parameter set, the model was fitted using the standard least squares method, and insignificant influencing items were eliminated, and finally a laser cladding process parameter model was established.

[0076] The mathematical expression of the fitted model is:

[0077] H=-133.23-1.67*SS+0.52*LP-130.15*PFR+1564.69*OR+537.02*BD-373.2*OR*BD

[0078] +0.07*SS*BD-0.27*LP*BD+0.00066*SS*LP+0.14*SS*PFR

[0079] T=-31.018+0.0208*SS+0.0321*LP+3.21*PFR-25.79*OR+4.71*BD+0.002*SS*BD

[0080] +5.2*OR*BD-0.0062*LP*BD-0.000014*SS*LP-0.0031*SS*PFR

[0081] Fitting results: Hardness-R 2 96.7%, thickness-R 2 It is 98.1%.

[0082] Furthermore, based on the laser cladding parameter model, optimized laser cladding parameters are obtained;

[0083] The laser cladding parameters include a laser power of 1440W, a scanning speed of 1200mm / min, a powder feeding speed of 3.8g / min, a spot diameter of 5mm, and an overlap rate of 0.4. Thus, a cladding layer with moderate thickness and appropriate hardness can be obtained. Cladding response parameter cladding layer hardness: predicted value 936.4HV, experimental value 924.5HV, predicted deviation 1.27%; cladding response parameter cladding layer thickness: predicted value 5.03mm, experimental value 4.63mm, predicted deviation 7.95%.

[0084] In some embodiments, a thicker cladding layer is more conducive to enhancing the wear resistance of the substrate, but an excessively thick cladding layer may cause microcracks in the cladding layer, affecting the service performance of the cladding layer. Therefore, it is particularly important that the thickness of the cladding layer is controllable.

[0085] Optionally, the thickness of the cladding layer is 2-6 mm.

[0086] In some embodiments, the hardness of the cladding layer is not less than 800 HV, such as 800, 900, 1200, 1500, etc. This can further improve the wear resistance of the substrate.

[0087] Optionally, the hardness of the cladding layer is 800-1500 HV.

[0088] In some embodiments, the method further includes S3 of cooling the product obtained after the laser cladding, wherein the cooling is performed in insulating sand.

[0089] The following will conduct performance tests on the method for manufacturing the cladding layer of the coal mining machine sliding shoe provided in the embodiment of the present application and related comparative examples.

[0090] [Example 1]

[0091] The preparation method of the cladding layer of the coal mining machine sliding shoe, the specific preparation process is:

[0092] Step 1: providing a shearer sliding shoe (made of 25Cr3Mo) as a substrate, and preheating the shearer sliding shoe at 200° C.;

[0093] (2) The alloy powder for laser cladding is fed into the laser action zone for laser cladding by a synchronous powder feeding method, so that the alloy powder for laser cladding is melted on the surface of the substrate to form a cladding layer.

[0094] The alloy powder for laser cladding in step (2) comprises the following components by mass percentage: C: 0.90%, O: 0.03%, B: 3.55%, Si: 3.92%, Cr: 16.32%, Fe: 7.84%, and the remainder is Ni; the laser cladding parameters are obtained by optimizing the following laser cladding parameter model: laser power is 1440 W, scanning speed is 1200 mm / min, powder feeding speed is 3.8 g / min, spot diameter is 5 mm, and overlap rate is 0.4.

[0095]

[0096] Using the optimized process parameters, the model predicted values ​​are: hardness 936.4HV, cladding layer thickness 5.03mm. The experimental verification values ​​are: hardness 924.5HV, cladding layer thickness 4.63mm. The predicted deviations are hardness 1.27% and cladding layer thickness 7.95%.

[0097] [Comparative Example 1]

[0098] The other parameters are the same as those in Example 1, except that the laser cladding parameters in step (2) are not obtained by using the following laser cladding parameter model: laser power is 1600 W, scanning speed is 600 mm / min, powder feeding speed is 2 g / min, spot diameter is 5 mm, and overlap rate is 0.4. After cladding, the hardness of the cladding layer is 824.7 HV, and the thickness of the cladding layer is 2.15 mm.

[0099] [Comparative Example 2]

[0100] The other parameters are the same as those in Example 1, except that the laser cladding parameters in step (2) are not obtained by using the following laser cladding parameter model: laser power is 1600 W, scanning speed is 600 mm / min, powder feeding speed is 4 g / min, spot diameter is 3 mm, and overlap rate is 0.6. After cladding, the hardness of the cladding layer is 753.1 HV, and the thickness of the cladding layer is 8.93 mm.

[0101] [Comparative Example 3]

[0102] The other parameters are the same as those in Example 1, except that the laser cladding parameters in step (2) are not obtained by using the following laser cladding parameter model: laser power is 1500 W, scanning speed is 900 mm / min, powder feeding speed is 3 g / min, spot diameter is 4 mm, and overlap rate is 0.5. After cladding, the hardness of the cladding layer is 805.0 HV, and the thickness of the cladding layer is 3.69 mm.

[0103] [Comparative Example 4]

[0104] The other parameters are the same as those in Example 1, except that the laser cladding parameters in step (2) are not obtained by using the following laser cladding parameter model: laser power is 1600 W, scanning speed is 1200 mm / min, powder feeding speed is 4 g / min, spot diameter is 5 mm, and overlap rate is 0.6. After cladding, the hardness of the cladding layer is 882.4 HV, and the thickness of the cladding layer is 2.62 mm.

[0105] [Test Example 1]

[0106] The test method of the hardness of the cladding layer is as follows: the pressure load on the wear-resistant part with the cladding layer is 4.9N, and the holding time is 10s. Each sample is measured at 10 points, and the average value is taken as the final hardness value.

[0107] The microstructure of the cladding layer of the coal mining machine shoe of Example 1 is shown in Figure 1 ,Depend on Figure 1 a It can be seen that there are no obvious shrinkage holes and cracks on the surface of the cladding layer, and carbides of various shapes are dispersed on the surface of the matrix phase of the cladding layer; the cross-sectional micromorphology of the cladding layer of the coal mining machine shoe of Example 1 is shown in Figure 1 b, by Figure 1 b It can be seen that there are no cracks or shrinkage holes at the connection between the cladding layer and the substrate, and the bonding is good.

[0108] The substrate and the cladding layer of Example 1 before cladding were subjected to friction and wear tests under dry friction service conditions. The final wear rate was determined by the profile method: the substrate before cladding was 3.11×10 -5 mm 3 / (N·m), cladding layer 2.35×10 -6 mm3 / (N·m); the wear morphology obtained is shown in Figure 2 , Figure 2 a is the mass before cladding, Figure 2 b is the cladding layer after cladding. It can be seen that there is no obvious peeling mark on the cladding layer after wear, indicating that the cladding layer prepared by the present invention exhibits good wear resistance under dry friction conditions.

[0109] [Test Example 2]

[0110] The other parts are the same as those in Test Example 1, except that the substrate and the cladding layer before cladding in Example 1 were placed in acidic mine water (pH = 5.5) to simulate the service conditions for friction and wear tests. The final wear rate was measured by the profile method: 3.97×10 -6 mm 3 / (N·m), cladding layer 1.04×10 -6 mm 3 / (N·m); the corrosion wear cross-section morphology obtained is shown in Figure 3 , Figure 3 a is the mass before cladding, Figure 3 b is the cladding layer after cladding. It can be seen that after wear, there is no obvious sign of corrosion microcracks extending to the inner layer of the cladding layer, indicating that the cladding layer prepared by the present invention exhibits good resistance to acid mine water corrosion.

[0111] [Test Example 3]

[0112] The other aspects are the same as those of Test Example 1, except that the substrate and the cladding layer of Example 1 before cladding were subjected to friction and wear tests in neutral mine water (pH = 7.0) to simulate the service conditions. The final wear rate was determined by the profile method as follows: 6.05×10 -6 mm 3 / (N·m), cladding layer 7.29×10 -7 mm 3 / (N·m); the wear surface morphology obtained is shown in Figure 4 , Figure 4 a is the mass before cladding, Figure 4 b is the cladding layer after cladding. It can be seen that after wear, obvious peeling marks appear on the surface of the substrate before cladding, while the worn surface of the cladding layer is relatively smooth, indicating that the cladding layer prepared by the present invention exhibits good wear resistance in a neutral mine water environment.

[0113] [Test Example 4]

[0114] The other parts are the same as those in Test Example 1, except that the substrate and the cladding layer before cladding in Example 1 were placed in alkaline mine water (pH = 9.5) to simulate the service conditions for friction and wear tests. The final wear rate was measured by the profile method: 3.06×10-6 mm 3 / (N·m), cladding layer 8.50×10 -7 mm 3 / (N·m); the wear surface morphology obtained is shown in Figure 5 , Figure 5 a is the mass before cladding, Figure 5 b is the cladding layer after cladding. It can be seen that the substrate before cladding presents obvious wear contour after wear and a large amount of wear debris is accumulated on the surface, while the worn surface of the cladding layer only shows slight scratches, indicating that the cladding layer prepared by the present invention has good wear resistance in alkaline mine water environment.

[0115] The Vickers hardness and thickness of the cladding alloy layer of the embodiment and the comparative example were tested respectively, and the obtained data are shown in Table 1.

[0116] Table 1: Vickers hardness and thickness of cladding alloy layer of embodiment and comparative example

[0117]

[0118]

[0119] It can be seen from Table 1 above that the cladding layer of the present application is metallurgically bonded to the substrate, has strong corrosion resistance and high wear resistance, and is helpful to improve the wear resistance of the wear-resistant parts.

[0120] It should be noted that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. The orientation words "inside" and "outside" refer to the inside and outside relative to the outline of each component itself. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Therefore, the exemplary term "above..." can include both "above..." and "below..." orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used here are interpreted accordingly.

[0121] It should also be noted that "one embodiment", "another embodiment", "embodiment", etc. mentioned in this application refer to the specific features, structures or characteristics described in conjunction with the embodiment included in at least one embodiment generally described in this application. The same expression appearing in multiple places in the specification does not necessarily refer to the same embodiment. Further, when describing a specific feature, structure or characteristic in conjunction with any embodiment, it is claimed that the realization of such feature, structure or characteristic in conjunction with other embodiments also falls within the scope of this application.

[0122] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0123] It should also be noted that the above are only preferred embodiments of the present application, and the patent protection scope of the present application is not limited thereto. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A wear-resistant component, characterized in that: The wear-resistant component comprises a substrate and a cladding layer located on at least a portion of the surface of the substrate. The cladding layer includes C element, O element, B element, Si element, Cr element, Fe element and Ni element. The base body includes a shearer shoe.

2. The wear-resistant component according to claim 1, characterized in that: In terms of mass percentage, the cladding layer comprises the following components: C: 0.80% ~ 0.90%, O: 0.03% ~ 0.04%, B: 3.20% ~ 3.55%, Si: 3.92% ~ 4.00%, Cr: 15.00% ~ 16.32%, Fe: 7.84% ~ 8.00%, the balance is Ni; And / or, the material of the coal mining machine sliding shoe includes at least one of 35CrMo, 35CrMoV, 35CrMnSi, 42CrMo, and 25Cr3Mo.

3. The wear-resistant component according to claim 1, characterized in that: The thickness of the cladding layer is 2-6 mm.

4. A method for preparing a cladding layer of a coal mining machine shoe, characterized in that: The following steps are involved: Providing a shearer skid shoe as a base; The alloy powder is fed into the laser action zone by a synchronous powder feeding method for laser cladding, so that the alloy powder for laser cladding is melted on the surface of the substrate to form a cladding layer. The cladding layer includes C element, O element, B element, Si element, Cr element, Fe element and Ni element.

5. The method for preparing the cladding layer of the coal mining machine shoe according to claim 4, characterized in that: In terms of mass percentage, the cladding layer includes the following components: C: 0.80% to 0.90%, O: 0.03% to 0.04%, B: 3.20% to 3.55%, Si: 3.92% to 4.00%, Cr: 15.00% to 16.32%, Fe: 7.84% to 8.00%, and the balance is Ni; And / or, the material of the coal mining machine sliding shoe includes at least one of 35CrMo, 35CrMoV, 35CrMnSi, 42CrMo, and 25Cr3Mo.

6. The method for preparing the cladding layer of the coal mining machine shoe according to claim 4, characterized in that: When performing the laser cladding, the laser cladding parameters set include laser power LP, scanning speed SS, powder feeding rate PFR, spot diameter BD and overlap rate OR. The laser cladding parameters are obtained by solving the laser cladding parameter model. The laser cladding parameter model includes: Wherein, T is the thickness of the cladding layer; H is the Vickers hardness of the cladding layer.

7. The method for preparing the cladding layer of the shearer shoe according to claim 6, characterized in that: Based on the laser cladding parameter model, obtaining laser cladding parameters; The laser cladding parameters include laser power LP of 1200-1600W, scanning speed SS1000-1600 mm / min, powder feeding speed PFR of 2-7g / min, spot diameter BD of 3-7mm, and overlap rate OR of 0.4-1.

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8. The method for preparing the cladding layer of the shearer shoe according to claim 4, characterized in that: Before performing the laser cladding, the method further includes: Preheating the shearer sliding shoe, The preheating temperature is 200-300°C.

9. The method for preparing the cladding layer of the coal mining machine shoe according to claim 4, characterized in that: Also includes: The laser cladding product is subjected to a cooling process, wherein the cooling process is performed in insulating sand.

10. The method for preparing the cladding layer of the shearer sliding shoe according to any one of claims 4 to 9, characterized in that: The hardness of the cladding layer is not less than 800 HV.

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