A kind of titanium matrix composite material and preparation method thereof

Abstract

The invention provides a method for preparing a titanium-based composite material. The method includes the following steps: providing Ti powder and SiC powder; mixing the Ti powder and SiC powder to obtain a first mixed powder; performing the first mixed powder under a nitrogen atmosphere. First ball milling to obtain the second mixed powder, wherein the process of the first ball mill is: the rotating speed is 500-600r / min, and the time is 1-2h; the second mixed powder is subjected to the first heat treatment to obtain the third mixed powder; Carry out second ball milling to the third mixed powder under nitrogen atmosphere, obtain the 4th mixed powder, wherein, the process of the second ball milling is: rotating speed is 500-600r / min, time is 3-4h; Carry out the 2nd mixed powder to the 4th mixed powder heat treatment to obtain the fifth mixed powder; and hot pressing and sintering the fifth mixed powder. The hardness, compression strength and bending strength of the titanium-based composite material manufactured by the method of the invention are significantly improved.

Description

technical field [0001] The invention relates to the field of composite materials, in particular to a titanium-based composite material and a preparation method thereof. Background technique [0002] As an emerging metal material, titanium and titanium alloys have many properties that other metals cannot match. First, titanium and titanium alloys have the highest specific strength, ranking first among metals; secondly, titanium and titanium alloys have high melting points, Good high temperature resistance, coupled with a series of excellent properties such as oxidation resistance, corrosion resistance, and light weight, is known as the most promising material in the aerospace field. When the performance of traditional titanium alloys has reached its limit and cannot meet the current increasingly urgent needs, people have proposed a new material - titanium matrix composites. [0003] In order to obtain high-performance titanium-based composite materials, in-situ synthesis is ...

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Problems solved by technology

The method in the prior art has the following defects: 1. In order to ensure that the powder does not agglomerate to ensure the generation of TiN particles, the ball milling speed must be reduced, but after reducing the ball milling speed, although the generation of TiN can be guaranteed, the powder mixing effect is significantly worse, The overall strength of the titanium-based composite material is lower than the theoretical value. At the same time, due to the slow ball milling speed and the low energy of the powder, the formation of TiN is affected; 2. In order to inhibit the abnormal growth of the composite material grain, a lower hot-pressing sintering temperature is designed , shorter hot-pressing sintering time, but this hot-pressing sintering process leads to less dense internal structure and more voids in the composite material, which further causes the overall strength of the titanium-based composite material to be lower than the theoretical value

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