Method for preparing Ti-Al-Sn bulk material from heat pressing self-propagating reaction product

Abstract

The invention provides a method for preparing a Ti-Al-Sn bulk material by carrying out hot pressing and self-propagating on a reaction product. With Ti powder, Al powder and Sn powder as initial raw materials and alcohol as medium, full ball milling and mixing are carried out in a ball mill; the mixed powder is placed in a drying cabinet and then in a different drying cabinet and is dried for 24 hours at a temperature of 60 DEG C; the dried powder is placed in a steel mould for self-propagating so as to generate a Ti-Al-Sn powder material after the reaction; and finally the obtained Ti-Al-Sn powder is placed in a graphite mould for hot pressed sintering so as to prepare the Ti-Al-Sn bulk material. The bulk material prepared according to the method can ensure the stoichiometric proportion,and volatilization of Al and Sn can be controlled during the heating process, so the method has stable performance; and the method is a novel preparing technique reducing the production cost and controlling the reaction product.

Description

1. Technical field [0001] The invention relates to a material preparation method, in particular to a method for preparing Ti-Al-Sn block material by hot pressing and sintering self-propagating reaction product Ti-Al-Sn powder material. 2. Background technology [0002] With the development of marine technology and aerospace industry, Ti-Al-Sn alloy, as a representative low-temperature alloy, has attracted more and more attention due to its excellent low-temperature performance. The low-temperature titanium alloy TA7 (Ti-5Al-2.5Sn) has a HCP crystal structure, and its strength increases with the decrease of temperature, but its plasticity does not change much. It can still maintain good ductility and toughness at low temperatures, avoiding the cold brittleness of metals, and is an ideal material for low-temperature containers, storage tanks and other equipment. Mainly used in aero-engines, aerospace pressure vessels, engine casings, etc. [0003] At present, this kind of al...

AI Technical Summary

Problems solved by technology

[0003] At present, the method of preparing this kind of alloy material is mainly to use water-cooled copper crucible vacuum induction melting (ISM), but this method has great defects, which seriously affects the properties of the prepared alloy.

Since the melting points of Ti-Al and Ti-Sn differ greatly, and the vacuum degree of the vacuum melting chamber is above 1.0 Pa, the heating temperature during melting is very high, so that there is a serious volatilization loss of alloy elements during the melting process. phenomenon, thereby destroying the stoichiometric composition of alloying elements, which in turn has a significant impact on the properties of the alloy