Method for preparing TiC reinforced titanium-based composite material based on cross-linking modified sintered titanium hydride

Abstract

The invention belongs to the technical field of non-ferrous metal processing, and discloses a method for preparing a TiC reinforced titanium-based composite material based on cross-linking modified sintered titanium hydride and the prepared composite material. Particularly, composite powder is prepared through the cross-linking reaction of hydroxylated titanium hydride and a carbon source, and theTiC reinforced titanium-based composite material is generated in situ through high-temperature sintering. According to the composite material prepared through the method, TiC with the size of 1-50 microns is evenly distributed in a Ti matrix, and the density of a sintered block is larger than or equal to 99%; and the tensile plasticity can reach 8%, the tensile strength can reach 570 MPa, and theabrasion volume is reduced by 19% compared with pure titanium. By means of the method, the problem of poor mechanical properties of a titanium-based composite material prepared by taking titanium hydride as a raw material in the prior art is solved, the preparation cost of the composite material is reduced, and the obtained TiC reinforced titanium-based composite material with excellent properties can be applied to preparation of high-strength wear-resistant structural parts in the fields of aerospace, armored cars, weapons, ships, automobiles and the like.

Description

technical field [0001] The invention belongs to the technical field of non-ferrous metal processing, and in particular relates to a method for preparing TiC-reinforced titanium-based composite materials based on cross-linked modified sintered titanium hydride and the prepared composite material, specifically, hydroxylated titanium hydride and carbon source Composite powders were prepared by cross-linking reaction and sintered at high temperature to generate TiC-reinforced titanium-based composites in situ. Background technique [0002] Titanium has high specific strength, excellent corrosion resistance, excellent biocompatibility, low thermal expansion coefficient and high service temperature. It is an ideal lightweight structural material and is used in high-precision aerospace, military, Biomedical devices and other fields, it also has great application potential in the fields of automobile, energy, chemical industry and daily consumption. [0003] To realize the great ap...

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Problems solved by technology

[0003] To realize the great application of pure titanium in daily consumption and other fields, two problems need to be overcome: 1. The strength of pure titanium is low

The introduction of interstitial atoms to solid solution strengthening of titanium will damage its plasticity, and interstitial atoms are difficult to remove

2. High manufacturing cost

[0006] (1) The preparation of titanium-based composites by melting and casting requires a melting temperature higher than the melting point of titanium (1668°C), which consumes a lot of energy; moreover, the material utilization rate of cast titanium-based composite products is low

[0007] (2) The preparation of titanium-based composites by powder metallurgy uses pure titanium as a raw material combined with mechanical alloying, element mixing and other methods to introduce a reinforcing phase, which has high impurity content and high manufacturing costs.

[0008] (3) The existing titanium matrix composites prepared by sintering titanium hydride powder have high residual porosity and poor mechanical properties

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