Process for hot spraying of rotating parts

Abstract

A hot spray method for the rotating workpiece includes such steps as applying a prestress to the surface of workpiece, washing for removing oil, roughtening the surface, spraying NiAl, NiCr or FeCrAl to form a basic layer, spraying Mo, 3Cr13 or 2Cr13 to form a working layer, and high-speed electric arc spray. It can improve the fatigue strength.

Description

Technical field [0001] The invention relates to the technical field of surface treatment, in particular to a spraying process for thermal spraying of rotating parts. Background technique [0002] As an important part of surface technology, thermal spraying technology has its unique advantages and is receiving more and more attention. The bonding strength, wear resistance and corrosion resistance of the coating, but in addition to the above performance requirements for some rotating and bending parts, the fatigue performance must also be considered. That is, how and how to improve the influence of thermal spray coating on the fatigue strength of the substrate. [0003] The existing thermal spraying method for rotating parts is basically: the pretreatment adopts sandblasting, combined with cleaning such as degreasing, and then spraying. Due to the sandblasting pretreatment, the bonding interface between the coating and the substrate is a rough surface, which is also a place where s...

AI Technical Summary

Problems solved by technology

The existence of residual tensile stress also accelerates the expansion of fatigue cracks, resulting in a rapid decrease in the fatigue strength of the coating matrix.