Air plasma spraying repair process of flow-passing component surface of slag slurry pump

Abstract

The invention discloses an air plasma spraying repair process of a flow-passing component surface of a slag slurry pump. The air plasma spraying repair process comprises the following steps that (1) the flow-passing component surface waiting to be repaired is subjected to sand-blasting and coarsening; (2) the flow-passing component surface after the sand-blasting and the coarsening is subjected to washing with acetone and ethyl alcohol and drying; (3) air plasma spraying equipment is adopted, and then the dry flow-passing component surface waiting to be repaired is subjected to plasma spraying with NiCrAl transition layer, and the thickness of the transition layer is 0.1-0.3 mm; and (4) air plasma spraying is adopted to spray WC-NiCrAl mixed powder on the transition layer, then a WC-NiCrAl gradient composite abrasion resistance coating is obtained, and the thickness of the gradient composite abrasion resistance coating is 0.2-0.6 mm. According to the air plasma spraying repair process, by means of choosing specific abrasion resistance and corrosion resistance materials and through the air plasma spraying repair process, the flow-passing component surface is repaired, the whole flow-passing component surface is subjected to strengthening, so that the abrasion resistance and corrosion resistance performance of the whole flow-passing component surface is increased.

Description

technical field [0001] The invention relates to the field of material technology, in particular to an atmospheric plasma spraying repair process on the surface of a slurry pump flow-through component. Background technique [0002] Abrasive wear and corrosive abrasion of centrifugal slurry pump Most of the flow parts of centrifugal slurry pump are made of tough materials, and its hydrodynamic abrasive wear is a composite wear composed of micro-cutting wear and deformation wear. During the normal operation of the centrifugal slurry pump, the flow state of the two-phase slurry flowing through the flow parts is turbulent, and the shape of the solid particles (coal, gangue, magnetite powder) in the slurry is in a random state. orientation. [0003] When the solid particles impact the surface of the flow-passing part at a small angle, when they contact the surface at a sharp angle, a high impact pressure will be generated on a small area of ​​the contact point. The vertical compo...

AI Technical Summary

Problems solved by technology

The deposits at the edge of the impact pit will be re-extruded, deformed and displaced to peel off the surface of the material, causing a certain amount of micro-volume material loss, resulting in deformation and wear of the wetted parts

[0005] At the same time, since the fluid processed by the slurry pump contains various corrosive liquids, it will cause dents, corrosion surfaces, etc.