Method for preparing ceramic coating on surface of tungsten-based alloy substrate, ceramic coating and tungsten-based alloy with coating

Abstract

The invention discloses a method for preparing a ceramic coating on the surface of a tungsten-based alloy substrate, a ceramic coating and a tungsten-based alloy with the coating. The method comprisesthe following steps of carrying out spray granulation on mixed powder and / or solid solution powder formed by hafnium carbide and tantalum carbide to prepare granulation powder; pre-treating the tungsten-based alloy to prepare the tungsten-based alloy with rough surface and cleanness; and carrying out plasma spraying on the granulation powder to the surface rough and clean tungsten-based alloy toprepare the ceramic coating. Preferably, the mixed powder is subjected to spray granulation by using the solid solution powder formed by the hafnium carbide and the tantalum carbide. According to themethod, the tantalum carbide-hafnium carbide composite ceramic coating is prepared on the tungsten-based alloy through plasma spraying, and the method has the advantages of being high in efficiency, high in pertinency, simple to operate, good in coating quality and the like. The damage to the tungsten-based alloy in the coating process is small, the smooth spraying of the coating is ensured, and the excellent performance of the tungsten-based alloy is kept.

Description

technical field [0001] The invention belongs to the field of coating materials, and in particular relates to a method for preparing a ceramic coating on the surface of a tungsten-based alloy substrate, a ceramic coating and a tungsten-based alloy with the coating. Background technique [0002] Tungsten-based alloy is an alloy formed by adding tungsten as the matrix and adding a part of other metals. The alloy has high density, high melting point, high specific gravity and good electrical and thermal conductivity, so it is widely used in aerospace, electronics, weapon manufacturing and other industries. It is often used to make gyroscope rotors, armor-piercing bullet cores, heat shields, electrodes, etc. With the continuous development of industry, the performance of tungsten-based alloys is also facing higher requirements. One of the main problems faced by tungsten-based alloys is the oxidation of tungsten and tungsten-based alloys caused by extreme environments. The oxidat...

AI Technical Summary

Problems solved by technology

Among them, the temperature required for the preparation of tantalum carbide-hafnium carbide composite ceramic coatings by the chemical vapor deposition process is too high, and the preparation temperature needs to be above 1300 ° C. This method is not applicable when the metal is the substrate; although the magnetron sputtering process can reduce coating preparation. temperature, but slow deposition rate, low efficiency and high cost

It has been reported that the plasma spraying process is mainly concentrated on single-phase hafnium carbide or tantalum carbide, and carbon fiber composite material is used as the substrate. The large difference in thermal expansion coefficient, the use of plasma spraying to prepare single-phase hafnium carbide or tantalum carbide on carbon composites will lead to cracking of the coating, which is not practical

Images