Surface treating method for improving TiAl base alloy surface property

Abstract

This is a kind of surface handling method which can improve the surface performance of TiAl base alloy. It refers to a kind of method to treat the surface of TiAl base alloy containing large quantity of beta phase stable element. This invention puts this kind of alloy into the pot in which graphite or carbon included material is set as the heat-source material of hot isostatic apparatus, or it puts the alloy into the pot in which non-graphite or no-carbon included material is set as the heat-source material of hot isostatic apparatus. If the latter is chosen, 0.001-20000g graphite powder, carbon powder, carbon-included simple substance or compound should be put into it to make hot isostatic pressing surface treatment. The temperature during the treatment should be between 800-1500deg.C, while the pressure should be 1-300Mpa. It should take 1 minute-20 hours to keep warm during the hot isostatic pressing surface treatment. In a word, this invention uses the essential hot-working method to do the treatment, having the merits of little cost, easy realization and no need to increase additional device.

Description

Technical field: [0001] The invention relates to a surface treatment method of a TiAl-based alloy containing a high-content β-phase stable element. Background technique: [0002] TiAl intermetallic compounds (hereinafter referred to as TiAl-based alloys) have the advantages of low density, high specific strength, high specific stiffness, high elastic modulus, corrosion resistance and high temperature creep resistance, etc. One of the most potential high-temperature structural materials. TiAl-based alloys are especially suitable for the manufacture of parts with high inertia and working under high temperature conditions. Under most working conditions, the parts have high temperature and high speed air flow, foreign body impact or high temperature friction, and are subject to strong oxidation and wear at high temperatures. Therefore, the oxidation resistance and wear resistance of TiAl-based alloys at high temperatures are one of the key factors determining the life of workin...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of poor wear resistance of existing TiAl-based alloys and poor high-temperature oxidation resistance above 700°C, and to provide a surface treatment method for improving the surface properties of TiAl-based alloys. The present invention has the advantages of simple process, low cost, and The high temperature oxidation resistance, hardness and wear resistance of the finished TiAl-based alloy material or component surface have been significantly improved.

Images