Preparation process of wear-resistant stainless steel alloy coating

Abstract

The invention discloses a preparation process of a wear-resistant stainless steel alloy coating. The preparation process comprises the following steps of S1, selection of raw materials, S2, embedmentof polytetrafluoroethylene in alloy powder, S3, preparation and stacking of metal cloth, S4, brazing, and S5, coating of the alloy coating on the stainless steel surface. Tungsten carbide hard alloy powder and NiCrBSi self-fluxing brazing alloy powder are used as a hard phase and subjected to rolling with polytetrafluoroethylene into the cloth, then the cloth adheres to the surface of stainless steel and then brazed into a metallurgical bonding composite coating, and the flexible metal cloth can adhere to the surface of a complex structural part; when brazing, the metal cloth and a substrate are simultaneously heated, the thermal residual stress of the coating is small, the thickness variation range of the coating is wide, and the surface roughness is small, so that the stainless steel surface has high wear resistance and erosion resistance; and the anti-abrasive wear performance of the obtained coating is much higher than the anti-abrasive wear performance of a flame surfacing coating, and the wear resistance and tensile strength of a stainless steel substrate are significantly improved.

Description

technical field [0001] The invention belongs to the technical field of stainless steel alloys, and in particular relates to a preparation process of a wear-resistant stainless steel alloy coating. Background technique [0002] Stainless steel is the abbreviation of stainless acid-resistant steel, and the steel grades that are resistant to weak corrosive media such as air, steam, water, or have stainless properties are called stainless steel; The steel type is called acid-resistant steel. Due to the difference in chemical composition of the two, their corrosion resistance is different. Ordinary stainless steel is generally not resistant to chemical medium corrosion, while acid-resistant steel is generally stainless. Stainless steel alloy coating refers to the protective layer coated on the surface of the workpiece. The protective layer protects the stainless steel and improves the wear resistance and corrosion resistance of the stainless steel. [0003] Tungsten carbide rei...

AI Technical Summary

Problems solved by technology

Due to the large mismatch of thermal expansion coefficient and elastic modulus between tungsten carbide and nickel-based alloys, the coatings prepared by flame spraying and explosive spraying are prone to cracking or even peeling off due to the weak bonding force between the coating and the substrate during use; The residual stress of the coating prepared by surfacing welding technology is large, and the amount of machining is large; when the laser cladding process is used, tungsten carbide particles are easy to deposit on the bottom of the coating, which is difficult to strengthen the surface of the coating. Stress concentration occurs at the bottom, causing defects