A stainless steel composite material and its preparation method and application

Abstract

The present invention provides a stainless steel composite material, comprising: a stainless steel substrate; a ZrHfCN coating provided on the surface of the stainless steel substrate. The present invention uses a magnetron sputtering method to deposit a transition metal coating on the surface of the stainless steel before the pipeline is formed. The coating forms a metallurgical bond with the substrate, and the shrinkage ratio is similar. This can avoid gaps caused by different shrinkage ratios during expansion or welding. It can also avoid scaling on the inner wall of the pipeline by regulating the hydrophilicity and hydrophobicity of the inner wall of the pipeline, thereby affecting the normal flow of the fluid and avoiding the occurrence of turbulence. In addition, the inner wall of the pipeline is easily eroded by the fluid and releases impurity ions, which eventually causes corrosion damage to the pipeline and leads to an increase in the impurity content of the normal fluid. The transition metal coating prepared by the present invention can also effectively enhance the wear resistance and corrosion resistance of the stainless steel surface.

Description

Technical Field

[0001] The present invention belongs to the technical field of stainless steel, and in particular relates to a stainless steel composite material and its preparation method and application, specifically relates to the technical field of coatings deposited on the surface of stainless steel, and in particular relates to a coating preparation method for enhancing the surface properties of stainless steel. Background Art

[0002] Currently, stainless steel is primarily used as a corrosion-resistant material for large-scale equipment, including pipes, tanks, and storage tanks subjected to corrosive media. The main methods for connecting stainless steel pipes to equipment include expansion joints, welding, or expansion welding. Surface performance is primarily improved by adding a lining made of rubber, polyethylene, and other materials to separate the corrosive media from the stainless steel and extend its service life. However, in actual operating conditions, pipes lined with rubber or polyethylene are prone to structural problems such as gaps after expansion or welding due to different material properties and shrinkage ratios. This can affect the normal operation of the pipes, and pipes connected by expansion joints, welding, or expansion welding are difficult to disassemble and repair. When used as tanks, stainless steel is primarily subject to corrosion and erosion from the medium, leading to failure. When used as storage tanks, the inner wall of stainless steel is susceptible to turbulent erosion and failure.

[0003] Stainless steel is widely used in engineering due to its excellent performance. However, since stainless steel pipes are typically expanded and welded, making them difficult to disassemble and assemble, corrosion and scaling of the inner wall can lead to leaks or fluid blockage, making them difficult to repair and replace. Furthermore, impurities in the fluid can erode the stainless steel surface and cause ion spalling on the pipe surface, ultimately leading to corrosion damage and increased impurity content in the fluid due to the release of stainless steel ions. Furthermore, viscous fluids tend to stick to the stainless steel surface, hindering flow and causing turbulence, which can accelerate failure.

[0004] Therefore, how to improve the surface properties of stainless steel and avoid its failure has become a hot topic in research in this field. Summary of the Invention

[0005] In view of this, an object of the present invention is to provide a stainless steel composite material and a preparation method and application thereof. The stainless steel composite material provided by the present invention has good wear resistance and corrosion resistance.

[0006] The present invention provides a stainless steel composite material, comprising:

[0007] Stainless steel substrate;

[0008] A ZrHfCN coating is provided on the surface of the stainless steel substrate.

[0009] Preferably, the stainless steel substrate is made of 316L stainless steel.

[0010] Preferably, the composition of the ZrHfCN coating is:

[0011] Zr: 22.23-26.34 wt%;

[0012] Hf: 2.75~7.33wt%;

[0013] C: 35.81-41.83 wt%;

[0014] N: 25.31-26.91 wt%;

[0015] O: 3.12~4.4wt%.

[0016] Preferably, the thickness of the ZrHfCN coating is 1.0-1.3 μm.

[0017] The present invention provides a method for preparing a stainless steel composite material, comprising:

[0018] The ZrHfCN coating was obtained on the surface of the stainless steel substrate by magnetron sputtering.

[0019] Preferably, the target material used in the magnetron sputtering process is a Zr-Hf-C composite target material, and the Zr-Hf-C composite target material includes:

[0020] Zr target;

[0021] A hafnium sheet and a carbon sheet are arranged on the surface of the Zr target.

[0022] Preferably, the substrate temperature during the magnetron sputtering process is 350-450°C.

[0023] Preferably, the target-substrate distance during the magnetron sputtering process is 50-100 mm.

[0024] Preferably, the sputtering power during the magnetron sputtering process is 100-150W.

[0025] The present invention provides a mechanical component, comprising: the stainless steel composite material described in the above technical solution; or the stainless steel composite material prepared by the method described in the above technical solution;

[0026] The shape of the mechanical parts is selected from plates and / or tubes.

[0027] The present invention uses magnetron sputtering to deposit a transition metal coating on the stainless steel surface before the pipe is formed. The coating forms a metallurgical bond with the substrate, resulting in a similar shrinkage ratio. This prevents gaps caused by different shrinkage ratios during expansion or welding. By regulating the hydrophilicity and hydrophobicity of the pipe's inner wall, scaling can be prevented, which can affect normal fluid flow and prevent turbulence. Furthermore, the inner wall of the pipe is susceptible to fluid erosion, releasing impurity ions, which ultimately causes corrosion damage to the pipe and increases the impurity content of the normal fluid. The transition metal coating prepared by the present invention can also effectively enhance the wear resistance and corrosion resistance of the stainless steel surface.

[0028] Furthermore, the present invention optimizes the ZrHfCN coating by changing the Hf element content in the ZrHfCN coating. Under specific content conditions, by controlling parameters such as substrate temperature, sputtering power, bias voltage, and target-substrate distance, the substrate temperature will affect the microstructure of the ZrHfCN coating, and certain microstructural changes will occur, thereby further improving the mechanical properties of the ZrHfCN coating. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A partial schematic diagram of a stainless steel plate according to an embodiment of the present invention;

[0030] Figure 2 Schematic diagram of the overall structure of the stainless steel pipe in an embodiment of the present invention;

[0031] Figure 3 Schematic diagram of the structure of the composite target in an embodiment of the present invention. DETAILED DESCRIPTION

[0032] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0033] The present invention provides a stainless steel composite material, comprising:

[0034] Stainless steel substrate;

[0035] A ZrHfCN coating is provided on the surface of the stainless steel substrate.

[0036] In the present invention, the composition of the stainless steel substrate is preferably 316L stainless steel (AISI316L austenitic stainless steel), and the standard grade is preferably 022Cr17Ni12Mo2; the composition is preferably:

[0037] Carbon C≤0.030wt%, silicon Si≤1.00wt%, manganese Mn≤2.00wt%, sulfur S≤0.030wt%, phosphorus P≤0.045wt%, chromium Cr: 16.00~18.00wt%, nickel Ni: 10.00~14.00wt%, and the balance is Fe.

[0038] In the present invention, the structure of the stainless steel substrate is preferably a stainless steel pipe.

[0039] In the present invention, the ZrHfCN coating is preferably provided on the inner wall of the stainless steel pipe (stainless steel substrate).

[0040] In the present invention, the composition of the ZrHfCN coating is preferably:

[0041] Zr: 22.23-26.34 wt%;

[0042] Hf: 2.75~7.33wt%;

[0043] C: 35.81-41.83 wt%;

[0044] N: 25.31-26.91 wt%;

[0045] O: 3.12~4.4wt%.

[0046] In the present invention, the mass content of Zr is preferably 23-25%, more preferably 24%; the mass content of Hf is preferably 3-7%, more preferably 4-6%, and most preferably 5%; the mass content of C is preferably 36-40%, more preferably 37-39%, and most preferably 38%; the mass content of N is preferably 25.4-26.5%, more preferably 26%; the mass content of O is preferably 3.5-4%, more preferably 3.6-3.8%.

[0047] In the present invention, the composition of the ZrHfCN coating is most preferably: Zr: 22.23 wt%; Hf: 7.33 wt%; C: 41.83 wt%; N: 25.49 wt%; O: 3.12 wt%.

[0048] The present invention improves the surface properties of stainless steel by controlling the coating element content through magnetron sputtering technology and regulating the coating properties, so that the fluid medium does not contact the inner wall of the stainless steel, thereby improving the service environment, extending the service life, and reducing equipment downtime caused by stainless steel corrosion problems.

[0049] In the present invention, the thickness of the ZrHfCN coating is preferably 1.0 to 1.3 μm, more preferably 1.15 μm to 1.3 μm, and most preferably 1.28 μm.

[0050] In the present invention, the ZrHfCN coating is preferably a crystalline coating.

[0051] The present invention provides a method for preparing a stainless steel composite material, comprising:

[0052] The ZrHfCN coating was obtained on the surface of the stainless steel substrate by magnetron sputtering.

[0053] In the present invention, the target material used in the magnetron sputtering process is preferably a Zr-Hf-C composite target material, and the Zr-Hf-C composite target material preferably includes:

[0054] Zr target;

[0055] Hf (hafnium) sheets and C (carbon) sheets are arranged on the surface of the Zr target.

[0056] In the present invention, the thickness of the Zr target is preferably 2 to 4 mm, more preferably 3 mm; the zirconium target is preferably circular, and the diameter of the zirconium target is preferably 60 to 65 mm, more preferably 62 to 63 mm. In the present invention, the thickness of the Hf sheet is preferably 0.5 to 2 mm, more preferably 1 to 1.5 mm; the Hf sheet is preferably rectangular or square; the side length of the Hf sheet is preferably 5 to 10 mm, more preferably 6 to 8 mm. In the present invention, the thickness of the C sheet is preferably 0.5 to 2 mm, more preferably 1 to 1.5 mm; the C sheet is preferably rectangular or square; the side length of the C sheet is preferably 5 to 10 mm, more preferably 6 to 8 mm.

[0057] In the present invention, the surface area ratio of the Zr target, C sheet and Hf sheet is preferably (2.3-3.3): (1-1.1): (1-1.9), more preferably (2.5-3.0): 1.05: (1.2-1.7), and most preferably (2.6-2.8): 1.05: (1.4-1.5).

[0058] In the present invention, the C sheet and the Hf sheet are preferably spaced apart on the surface of the zirconium target. The spacing between the C sheet and the Hf sheet is preferably 55 to 65 degrees, more preferably 60 degrees. The present invention has no special restrictions on the number of the C sheet and the Hf sheet. Those skilled in the art can set the number of the C sheet and the Hf sheet according to the component content of each element in the pre-obtained coating. The schematic diagram is shown as follows: Figure 3 shown.

[0059] In the present invention, the method for preparing the Zr-Hf-C composite target preferably includes:

[0060] The C sheet, Hf sheet and Zr target are bonded together to obtain a Zr-Hf-C composite target.

[0061] In the present invention, the laminating method preferably includes:

[0062] The hafnium sheet and the carbon sheet were placed on the surface of the zirconium target at an interval of 60°.

[0063] In the present invention, the ZrHfCN coating is obtained by using transition metals Hf and Zr and magnetron sputtering technology, and using a Zr-Hf-C composite target material with a specific structure as a Zr-Hf-C source to deposit on the surface of a stainless steel substrate. In the present invention, a Zr-Hf-C composite target is formed by laminating a pure carbon (C) sheet, a pure hafnium (Hf) sheet, and a metal Zr target surface. The carbon (C) content and hafnium (Hf) content can be arbitrarily changed by increasing or decreasing the number of hafnium sheets or carbon sheets, thereby improving the mechanical properties and corrosion resistance of 316L stainless steel. By increasing or decreasing the number of hafnium sheets on the surface of the zirconium target, the Hf element content in the ZrHfCN coating is improved, the microstructure, mechanical properties, and electrochemical properties of the ZrHfCN coating are optimized, and the surface hydrophilicity and hydrophobicity of the ZrHfCN coating are optimized. By changing the Hf element content of the ZrHfCN coating, the ZrHfCN coating undergoes lattice distortion and shifts to a high angle, thereby increasing the dislocation density and hindering slip. Changing the Hf element content affects the microstructure of the ZrHfCN coating, and further affects the mechanical properties of the ZrHfCN coating.

[0064] In the present invention, the magnetron sputtering preferably further comprises:

[0065] The stainless steel substrate is pretreated.

[0066] In the present invention, the pretreatment method preferably includes:

[0067] Electrolytic polishing and ultrasonic cleaning.

[0068] In the present invention, the magnetron sputtering method preferably includes:

[0069] After the equipment is evacuated, Ar is introduced to generate an ionosphere-glow discharge-coating pre-sputtering (to remove oxides on the substrate surface), and then formal sputtering is carried out (adjust parameters to the required values ​​according to process requirements). After sputtering is completed, sputtering is stopped and the temperature is lowered, and then normal pressure is restored, the sample is taken out, and characterization is carried out.

[0070] In the present invention, the vacuum degree of the vacuum pumping is preferably 10 -5 Pa.

[0071] In the present invention, during the coating pre-sputtering process, a baffle is preferably used to shield the stainless steel substrate and the Zr-Hf-C composite target.

[0072] In the present invention, the sputtering power in the pre-sputtering process is preferably 110-130 W, more preferably 115-125 W, and most preferably 120 W; the substrate temperature is preferably 350-450°C, more preferably 390-410°C, and most preferably 400°C; the target-substrate distance is preferably 60-80 mm, more preferably 65-75 mm, and most preferably 70 mm; the substrate bias is preferably -80--120 V, more preferably -90--110 V, and most preferably -100 V.

[0073] In the present invention, the substrate temperature during the magnetron sputtering process is preferably 350-450°C, more preferably 380-420°C, and most preferably 400°C.

[0074] In the present invention, the substrate temperature during the formal sputtering process is preferably 350-450°C, more preferably 370-430°C, and most preferably 390-410°C; the target-substrate distance is preferably 50-100mm, more preferably 60-90mm, and most preferably 70-80mm; the sputtering power is preferably 100-150W, more preferably 110-140W, and most preferably 115-125W; the substrate bias is preferably -50--150V, more preferably -80--120V, and most preferably -100V.

[0075] The present invention provides a mechanical component, comprising: the stainless steel composite material described in the above technical solution, or the stainless steel composite material prepared by the method described in the above technical solution.

[0076] In the present invention, the mechanical parts can be in the shape of plates or tubes, preferably tubes.

[0077] In an embodiment of the present invention, the structural diagram of the stainless steel composite material is as follows: Figure 1 and Figure 2 As shown, (1) is 316L stainless steel, (2) is ZrHfCN coating, and (3) is a schematic diagram of the overall structure of the 316L stainless steel plate with ZrHfCN coating deposited on the surface after being bent into a tube. Figure 1 In the present study, 316L stainless steel plates were pretreated and placed in a magnetron sputtering chamber equipped with a Zr-Hf-C target. The microstructure of the ZrHfCN coating was regulated by controlling the Hf element content in the ZrHfCN coating (substrate temperature 350-450°C, target-substrate distance 50-100mm, sputtering power 100-150W, substrate bias -50--150V). The mechanical properties and corrosion resistance of the ZrHfCN coating were further regulated. The ZrHfCN coating prepared using the above parameters had good bonding ability with the substrate and did not fall off from the substrate. Figure 2In the process, a ZrHfCN coating is deposited on the surface of 316L stainless steel by magnetron sputtering technology, and then the 316L stainless steel with the ZrHfCN coating deposited on the surface is rolled into a tube using a plate rolling machine to obtain a 316L stainless steel round tube with the ZrHfCN coating deposited on the inner wall.

[0078] The present invention controls the content of metallic Hf elements by adjusting the number of Hf flakes during the coating preparation process to prepare ZrHfCN coatings with different coating contents. The Hf element in the coating is gradually increased from 2.75% to 7.33% to obtain a ZrHfCN coating with excellent performance. The performance of the coating gradually improves with the increase of the Hf element content. The prepared ZrHfCN coating has good bonding ability with the substrate and is not easy to fall off, thus avoiding the problems existing in conventional linings. The ZrHfCN coating is prepared using magnetron sputtering technology, and a Zr-Hf-C composite target is used as a Zr-Hf-C source to obtain a coating on the inner wall of a stainless steel pipe. The target material is directly rolled into a tube, and the number of carbon sheets and hafnium sheets bonded to the surface is adjusted to have variable C and Hf contents. The present invention takes into account the influence of the inner wall's hydrophilicity and hydrophobicity on the structure of the fluid medium, and optimizes the Hf element content to achieve regulation of the surface hydrophilicity and hydrophobicity of the ZrHfCN coating, thereby making the stainless steel more widely applicable and having a longer service life. The present invention adopts metallurgically bonded 316L stainless steel and ZrHfCN coating, and directly forms the target material in one go without the need for an additional lining. For example, when used in pipeline transportation conditions, this can avoid the formation of gaps due to the different contractions of the lining and the metal tube after expansion or welding, which can lead to failure of the stainless steel tube.

[0079] The stainless steel substrate used in the following embodiments of the present invention is an AISI 316L austenitic stainless steel product provided by Shandong Yongshang Metal Technology Co., Ltd., with a standard grade of 022Cr17Ni12Mo2.

[0080] The preparation method of the Zr-Hf-C composite target material used in the following embodiments of the present invention is:

[0081] The hafnium sheet and the carbon sheet were placed on the surface of the zirconium target at an interval of 60°.

[0082] Example 1

[0083] ZrHfCN coating was prepared on the surface of stainless steel substrate by magnetron sputtering technology. The parameters in the magnetron sputtering process were: target material C:Hf:Zr area ratio of 1:1:4, target-substrate distance of 70mm, bias voltage of -100V, substrate temperature of 400℃, sputtering power of 120W, and sputtering time of 150min. ZrHfCN coating with a thickness of 1.18μm was successfully prepared on the surface of 316L stainless steel substrate.

[0084] The composition of the ZrHfCN coating prepared in Example 1 was detected by X-ray photoelectron spectroscopy, and the test results were as follows:

[0085] The coating consists of Hf, Zr, N, C and O, wherein the Hf element content is 2.75wt.%, the Zr element content is 26.34wt.%, the N element content is 26.91wt.%, the C element content is 39.84wt.%, and O is an impurity element with a content of 4.17wt.%.

[0086] The hardness and elastic modulus of the coating prepared in Example 1 were tested using an NHT in-situ nanoindenter produced by CSM, Switzerland, with an indentation depth of 1000 nm and an indenter displacement rate of 10 nm / s. The corrosion resistance of the coating prepared in Example 1 was tested using a CHI660E electrochemical workstation produced by Chenhua, China, using a three-electrode system. Phase analysis of the coating prepared in Example 1 was performed using an X'Pert Pro multifunctional X-ray diffractometer produced by PANalytical, the Netherlands, using a θ-2θ linkage scanning mode and a scanning range of 20° to 90°.

[0087] The test results show that the coating prepared by the process parameters of Example 1 is a crystalline ZrHfCN coating with a nanohardness of 34.05 GPa, an elastic modulus of 366.72 GPa, and a self-corrosion current density of 2.26×10 -8 A.cm -2 , better than 316L stainless steel substrate.

[0088] Example 2

[0089] ZrHfCN coating was prepared on the surface of stainless steel substrate by magnetron sputtering technology. The parameters in the magnetron sputtering process were: target material C:Hf:Zr area ratio of 1:2:3, target-substrate distance of 70mm, bias voltage of -100V, substrate temperature of 400℃, sputtering power of 120W, and sputtering time of 150min. ZrHfCN coating with a thickness of 1.21μm was successfully prepared on the surface of 316L stainless steel substrate.

[0090] The coating components prepared in Example 2 were tested according to the method of Example 1, and the test results were as follows:

[0091] The coating consists of Hf, Zr, N, C and O, wherein the Hf element content is 4.79wt.%, the Zr element content is 23.67wt.%, the N element content is 26.43wt.%, the C element content is 41.24wt.%, and O is an impurity element with a content of 3.88wt.%.

[0092] The coating prepared in Example 2 of the present invention was tested according to the method of Example 1. The test results showed that the coating prepared by the process parameters of Example 2 was a crystalline ZrHfCN coating with a nanohardness of 36.82 GPa, an elastic modulus of 370.09 GPa, and a self-corrosion current density of 7.74×10 -9 A.cm -2 , which is better than the 316L stainless steel substrate and the ZrHfCN coating prepared in Example 1.

[0093] Example 3

[0094] ZrHfCN coating was prepared on the surface of stainless steel substrate by magnetron sputtering technology. The parameters in the magnetron sputtering process were: target material C:Hf:Zr area ratio of 1:3:2, target-substrate distance of 70mm, bias voltage of -100V, substrate temperature of 400℃, sputtering power of 120W, and sputtering time of 150min. ZrHfCN coating with a thickness of 1.28μm was successfully prepared on the surface of 316L stainless steel substrate.

[0095] The coating components prepared in Example 3 were tested according to the method of Example 1, and the test results were as follows:

[0096] The coating consists of Hf, Zr, N, C and O, wherein the Hf element content is 7.33wt.%, the Zr element content is 22.23wt.%, the N element content is 25.49wt.%, the C element content is 41.83wt.%, and O is an impurity element with a content of 3.12wt.%.

[0097] The coating prepared in Example 3 of the present invention was tested according to the method of Example 1. The test results showed that the coating prepared by the process parameters of Example 3 was a crystalline ZrHfCN coating with a nanohardness of 41.94 GPa, an elastic modulus of 381.28 GPa, and a self-corrosion current density of 6.54×10 -9 A.cm -2 , which is better than the 316L stainless steel substrate and the ZrHfCN coating in Example 2 and Example 3.

[0098] When used as an industrial corrosion-resistant material, stainless steel is susceptible to corrosion and erosion, leading to component failure. To extend the service life of stainless steel components, existing technologies generally employ inner wall linings to improve their surface properties. However, when used as pipes, the different properties of the stainless steel and lining materials result in different shrinkage ratios after expansion or welding, which can easily lead to structural problems such as gaps, hindering the normal use of stainless steel pipes. The present invention deposits a ZrHfCN coating on the inner wall of the stainless steel using a magnetron sputtering method. The coating is metallurgically bonded to the substrate, achieving a similar shrinkage ratio during subsequent expansion and welding processes. This improves the uneven shrinkage ratios found in existing stainless steel pipe manufacturing processes, thereby extending the actual service life of the stainless steel pipes, improving the corrosion resistance and wear resistance of stainless steel components, avoiding component failure due to lining failure, and extending the service life of stainless steel components.

[0099] The present invention optimizes the microstructure, mechanical properties (nanohardness 31GPa-41GPa, elastic modulus 359GPa-381GPa) and electrochemical properties (self-corrosion current density 1.72×10 -8 A.cm -2 ~6.54×10 -9 A.cm -2 ), which are significantly better than the base 316L stainless steel (nanohardness 6.1GPa, elastic modulus 210GPa, self-corrosion current density 4.19×10 -6 A.cm -2 ), and the metal coating with optimized process parameters has good bonding strength with the substrate, does not have the problem of falling off, and can exist stably.

[0100] The present invention provides a new coating preparation method for enhancing the surface performance of stainless steel. Compared with the prior art, the coating preparation method used in the present invention can effectively avoid structural problems such as gaps caused by different shrinkage ratios during expansion tube connection, can effectively extend the service life of stainless steel pipes, can improve the comprehensive performance of the 316L stainless steel surface, including mechanical properties, wear resistance and corrosion resistance, and can effectively inhibit the formation of turbulence in the pipeline, which is beneficial to engineering applications; through the deposited ZrHfCN coating, the degree of impurity scaling on the surface of 316L stainless steel can be improved, and the phenomenon of fluid deterioration in the pipeline due to ion release from 316L stainless steel can be inhibited, so that the performance of 316L stainless steel as a pipeline material is improved, and the service life of 316L stainless steel as a pipeline material is extended. The coating deposited on the entire stainless steel surface has a simple structure, is easy to operate, and has better use effect.

[0101] Although the present invention has been described and illustrated with reference to specific embodiments of the present invention, these descriptions and illustrations do not limit the present invention. It will be clearly understood by those skilled in the art that, without departing from the true spirit and scope of the present invention as defined by the appended claims, various changes may be made to make specific circumstances, materials, compositions of matter, substances, methods or processes suitable for the object, spirit and scope of the present application. All such modifications are intended to be within the scope of the appended claims. Although the methods disclosed herein have been described with reference to specific operations performed in a specific order, it will be understood that these operations may be combined, subdivided or reordered to form equivalent methods without departing from the teachings of the present invention. Therefore, unless otherwise indicated herein, the order and grouping of operations are not limitations of the present application.

Claims

1. A stainless steel composite material comprising: Stainless steel substrate; A ZrHfCN coating provided on the surface of the stainless steel substrate; The composition of the ZrHfCN coating is: Zr: 22.23wt%; Hf: 7.33wt%; C: 41.83wt%; N: 25.49wt%; O: 3.12wt%; The preparation method of the stainless steel composite material comprises: ZrHfCN coating was obtained on the surface of stainless steel substrate by magnetron sputtering method; The target material used in the magnetron sputtering process is a Zr-Hf-C composite target material, and the Zr-Hf-C composite target material includes: Zr target; A hafnium sheet and a carbon sheet are provided on the surface of the zirconium target; the carbon sheet and the hafnium sheet are provided on the surface of the zirconium target at intervals of 55 to 65 degrees; The target material C:Hf:Zr area ratio of the Zr-Hf-C composite target is 1:3:2, and the target-substrate distance is 70 mm; During the magnetron sputtering process, the bias voltage was -100 V, the substrate temperature was 400° C., the sputtering power was 120 W, and the sputtering time was 150 min.

2. The stainless steel composite material according to claim 1, characterized in that The stainless steel substrate is composed of 316L stainless steel.

3. The stainless steel composite material according to claim 1, characterized in that The thickness of the ZrHfCN coating is 1.0-1.3 μm.

4. A method for preparing a stainless steel composite material, comprising: ZrHfCN coating was obtained on the surface of stainless steel substrate by magnetron sputtering method; The target material used in the magnetron sputtering process is a Zr-Hf-C composite target material, and the Zr-Hf-C composite target material includes: Zr target; A hafnium sheet and a carbon sheet are provided on the surface of the zirconium target; the carbon sheet and the hafnium sheet are provided on the surface of the zirconium target at intervals of 55 to 65 degrees; The target material C:Hf:Zr area ratio of the Zr-Hf-C composite target is 1:3:2, and the target-substrate distance is 70 mm; During the magnetron sputtering process, the bias voltage was -100 V, the substrate temperature was 400° C., the sputtering power was 120 W, and the sputtering time was 150 min.

5. A mechanical component comprising: The stainless steel composite material according to claim 1; Or the stainless steel composite material prepared by the method according to claim 4; The shape of the mechanical parts is selected from plates and / or tubes.

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