A method for preparing titanium-based composite materials by sintering pre-dispersed graphite composite titanium hydride

Abstract

The invention belongs to the technical field of non-ferrous metal processing, and discloses a method for preparing a titanium-based composite material by sintering pre-dispersed graphite compounded with titanium hydride and the prepared composite material. Specifically, titanium hydride powder and graphite powder are used as raw materials and formed by powder metallurgy TiC reinforced titanium matrix composites. The method of the invention firstly uses polyvinylpyrrolidone to pre-disperse graphite powder, and then attaches it to the surface of titanium hydride for sintering to form, so as to solve the problems of powder agglomeration, poor alloy performance and the like existing in the direct physical mixing of titanium hydride and graphite powder. The tensile strength of the obtained TiC-reinforced titanium-based composite material can be 535MPa, the elongation after fracture can be 10%, and the wear volume after optimization is reduced by 15% compared with pure titanium. It can be used in the preparation of high-strength parts or wear-resistant structural parts in the fields of aerospace, armored vehicles, weapons, ships and automobiles.

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 a titanium-based composite material by sintering pre-dispersed graphite composite titanium hydride and the prepared composite material, specifically using titanium hydride powder and graphite powder as raw materials and adopting powder metallurgy forming TiC reinforced titanium matrix composites. Background technique [0002] As a non-ferrous metal material with abundant reserves, titanium has high mechanical strength, low density, excellent biocompatibility and excellent corrosion resistance. It is widely used in aerospace industry, military weapons, energy, chemical industry, shipbuilding and other fields. In order to meet the high requirements of modern industry for titanium, it must reduce production costs while continuously improving its mechanical properties and service temperature. [0003] The preparation of titaniu...

AI Technical Summary

Problems solved by technology

However, the composite materials prepared by sintering titanium hydride face the following problems: 1. The intrinsic brittleness of titanium hydride makes it easy to break into nano-powders during the process of mechanical alloying to prepare composite powders, and a large amount of impurities are introduced, resulting in extremely poor alloy properties; 2. 1. There are problems such as agglomeration of the reinforced phase, excessive size and low density after sintering when the raw material powder of the reinforced phase is mixed directly with titanium hydride; therefore, the prepared composite material has poor reinforcement effect and poor comprehensive performance

[0005] (1) High cost: high melting temperature (>1668°C) is required to consume a lot of energy when preparing titanium matrix composites by casting method; moreover, the material utilization rate of cast titanium materials is low

Most of the titanium-based composites prepared by powder metallurgy use pure titanium powder as raw material combined with mechanical alloying and high energy consumption pressure-assisted sintering (hot isostatic pressing, etc.) to prepare composite materials with small size and uniform distribution of reinforcement phase; The cost of raw materials and processing costs of titanium matrix composites are relatively high

[0006] (2) Poor mechanical properties: using titanium hydride powder as raw material to prepare titanium-based composite materials can reduce costs

However, the plasticity of titanium-based composites prepared by alloying titanium hydride and reinforcing phase particles or fibers by mechanical alloying and then pressing and sintering is extremely low; Titanium matrix composites also have problems such as high residual porosity and low tensile plasticity.

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