Special material for stainless steel-based composite coating for thin valve plate and preparation method thereof

Abstract

The invention relates to the field of material-surface modification, particularly to a special material for stainless steel substrates composite coating for a thin valve plate and a preparation method of the special material. According to the special material for the stainless steel substrate composite coating for the thin valve plate, stainless steel metal powder is used as a composite coating bonding phase, and the wear resistance is improved through the introduction of hard-phase particles, wherein the stainless steel metal powder is 316L stainless steel powder, the hard-phase particles are WC, and the composite coating comprises the following elements in percentage by weight: 8-9% of Cr, 5-6% of Ni, 1-2% of Mo, 42-43% of W, 2-3% of C, and the balance of Fe. The wear-resistant corrosion-resistant stainless steel substrate composite coating which is disclosed by the invention, is prepared by a method based on cold spraying, the characteristic of low-temperature deposition of the cold spraying is kept, so that undesirable phenomena, such as decomposition, oxidation, phase transition, crystal grain growth and the like, of the coating material, which are caused by high-temperature deposition techniques, such as laser cladding, hot spraying and the like, are avoided.

Description

【Technical field】 [0001] The invention relates to the field of material surface modification, in particular to a special stainless steel-based composite coating material for thin valve plates and a preparation method thereof. 【Background technique】 [0002] Valves are one of the important components of the equipment manufacturing industry and the main control components in fluid delivery systems, widely used in chemical, petrochemical, petroleum, papermaking, mining, electric power, food, pharmaceuticals, water supply and drainage, mechanical equipment, electronics , urban construction and other fields, including ball valves, butterfly valves, gate valves, globe valves, regulating valves and other types. [0003] The sealing performance of the valve is the most important technical performance index of the valve. The sealing part of the valve (such as the contact between the opening and closing parts and the two sealing surfaces of the valve seat, the joint between the packin...

AI Technical Summary

Problems solved by technology

[0009] The present invention aims at the above-mentioned deficiencies existing in the existing valve surface modification coating and its preparation technology, and provides a stainless steel substrate for surface modification of thin valve plates, which uses stainless steel as the bonding phase and hard phase particles as the reinforcing phase. The special material for wear-resistant and corrosion-resistant composite coating and its efficient preparation method solve the problems of oxidative decomposition of coating material, workpiece deformation, thin coating thickness and poor coating adhesion in the existing preparation technology

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