Method for preparing high-performance in-situ TIC-reinforced titanium matrix composite workpieces based on cnts and laser additive manufacturing processing technology

Abstract

The invention discloses a method for manufacturing a high-performance in-situ TiC reinforced titanium-based composite workpiece on the basis of CNTs and a laser additive manufacturing and processing technology. The method includes the following steps that (1) the carbon nano tubes are subjected to preliminary ultrasonic dispersion treatment; (2) pure titanium powder with the average particle size of 45-75 microns is mixed with the carbon nano tubes to obtain a mixture, and CNTs / Ti mixed powder is obtained by ball-milling the mixture through a ball mill under the protection of argon; and (3) the ball-milled CNTs / Ti mixed powder is shaped through a laser additive manufacturing and processing method so as to obtain a high-performance in-situ TiC reinforced titanium-based composite body. The method has the advantages that in-situ TiC reinforcement phases are formed on the basis of a CNTs in-situ reaction and evenly distributed in a titanium substrate, and the interface bonding strength is high; grains of a composite are refined remarkably; net forming or near-net forming of a test piece can be achieved; any complex heterogeneous part can be formed.

Description

technical field [0001] The invention belongs to the fields of material science and engineering and mechanical engineering, and especially relates to a method for preparing an in-situ TiC-reinforced Ti-based composite material with high strength, high hardness, and a novel enhanced microstructure based on CNTs and laser additive manufacturing processing technology. Background technique [0002] As a rare metal, titanium has excellent properties such as small specific gravity, high specific strength, good corrosion resistance, high heat resistance, and easy welding. It is a high-quality new structural material, functional material and bioengineering material, and is widely used in aviation. Aerospace, industrial ships, energy power and biomedicine, etc. However, titanium and titanium alloys generally have the characteristics of low hardness, poor wear resistance, and high chemical activity, which limit their further applications. Therefore, further improving the hardness, wea...

AI Technical Summary

Problems solved by technology

[0004] When using traditional methods, such as: casting, powder metallurgy, spraying, etc. to prepare CNTs-reinforced Ti-based composites, due to the difficulty of dispersion of CNTs and the poor wettability of the interface with the metal matrix, the reinforcement effect is significantly weakened, and the process is complicated and the cost is high. ; When the traditional method is used to prepare in-situ TiC-reinforced Ti-based composites, it is easy to generate coarse TiC dendrites, which not only makes the thermal processing of the composites very difficult, but also cannot give full play to the strengthening effect of TiC; For composite materials, the particles of the general reinforcement phase are coarse, there are defects inside, and the interface with the matrix is ​​weak, which cannot meet the requirements of certain environments.

In summary, when using traditional methods to prepare TiC-reinforced Ti-based composites, the process is complicated and thermal processing is difficult, which cannot meet the use in certain environments and the forming requirements of complex-shaped parts.

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