Preparation method of tungsten carbide coating layer sprayed on surface of aluminum base material through explosion

Abstract

The invention discloses a preparation method of a tungsten carbide coating layer sprayed on a surface of an aluminum base material through explosion. The preparation method comprises the following steps: (1) the surface of an in-situ synthesis TiB2 particle-reinforced aluminum base material is pretreated by adopting an oil removing and shot blasting process; (2) a wear resisting and corrosion resisting WC-10Co4Cr coating layer is prepared on the surface of the in-situ synthesis TiB2 particle-reinforced aluminum base material by adopting a pulse explosion spraying method; and the temperature of the aluminum base material is controlled within 60-120 DEG C; (3) after the spraying is finished, the coating layer is grinded and finished by adopting a diamond grinding wheel; and (4) the coating layer is closed by adopting epoxy resin sealant. The method can prepare the coating layer on the surface of a composite material of a propeller hub plywood of a connecting piece of a helicopter rotor system so as to improve the corrosion resistance of the surface of the TiB2 particle-reinforced aluminum base composite material, and can effectively prevent the invalidation caused by fretting wear and surface scratching so as to prolong the fatigue fracture resisting service life of the material above 3 times.

Description

technical field [0001] The invention relates to a preparation method of a surface coating, in particular to a preparation method of an explosively sprayed tungsten carbide coating which can be used on the surface of an aluminum-based composite material such as a rotor hub splint of a helicopter rotor system and has both wear-resistant and anti-corrosion functions. Background technique [0002] Wear is one of the three main forms of material failure, and equipment failure is often caused by the failure of individual parts. The propeller hub splint of the helicopter rotor system has high requirements on the surface properties of the material, especially under the conditions of high speed and heavy load, the local wear of the surface will cause the failure of the parts and reduce the reliability of the equipment. Introduction of TiB by in situ autogenesis 2 The particle-reinforced phase greatly improves the mechanical properties of aluminum alloy and replaces the powder metall...

AI Technical Summary

Problems solved by technology

The flying speed of the sprayed material particles is low, resulting in insufficient flattening of the particles, the internal porosity of the coating is generally as high as 3-10%, and the coating bonding strength is poor; the high temperature of the spraying process will easily cause the annealing of the substrate to cause a decline in mechanical properties, while the aluminum alloy When the surface temperature exceeds 170°C, the residual compressive stress generated by shot peening will disappear, which will significantly reduce the service life of fatigue fracture resistance of aluminum alloy materials