Cladding layer of valve sealing surface

Abstract

The invention discloses a cladding layer of a valve sealing surface. The alloy powder of the cladding layer comprises iron, chromium, nickel, molybdenum, boron, silicon, carbon, tungsten and vanadiumelements, wherein the iron is used as a main body, the content of the iron is more than 50%, the content of the chromium is more than 15%, the content of the boron is 2.0%, and the content of the silicon is 2.0%; the preparation technological process of the alloy powder comprises the steps of burdening, smelting, atomizing, drying and screening; and the cladding method of the cladding layer adoptsa laser cladding process, cladding lap joint is carried out on the valve sealing surface, and the thickness of the cladding layer is 1000-2000 microns. According to the obtained cladding layer, cobalt-free alloy with iron and chromium as main bodies is utilized, the wear resistance, the impact resistance, the corrosion resistance and the like of the sealing surface of the ball valve are more excellent through a specific alloy powder preparation process and a cladding method of the cladding layer, the quality of the valve sealing surface is improved, and the service life of the valve is prolonged.

Description

technical field [0001] The invention relates to the technical field of surface engineering, in particular to a cladding layer of a valve sealing surface. Background technique [0002] The valve is a control part in the fluid delivery system, and the valve sealing surface refers to the part where the valve seat and the closing member contact each other to form a seal. During the use of the valve, the sealing surface is in the medium for a long time and is eroded and corroded by the medium. It is the most critical working surface of the valve, and its quality is related to the service life of the valve. The surfacing materials of existing valve sealing surfaces are cobalt-containing alloys such as Stellite6 and cobalt-free materials such as 410, 440C, and 616. Due to the high price of cobalt-based alloys and the lack of cobalt resources in my country, cobalt-based alloys are used in valve sealing surface materials. Restricted; 410 cobalt-free materials are not suitable for use...

AI Technical Summary

Problems solved by technology

However, at present, there is almost no special metal powder for laser cladding in the domestic and foreign markets. Although some progress has been made in preparing the powder required for laser cladding by mechanical powder mixing, there are still many problems, which affect the application of laser technology on the sealing surface of valves.

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