A kind of preparation method of TIC reinforced ultra-fine grain β titanium niobium matrix composite material

Abstract

The invention discloses a preparation method for a TiC reinforced ultra-fine grain beta titanium and niobium based composite material. According to the preparation method, pure Ti powder and pure Nb powder serve as raw materials, a carbon and hydrogen containing process control agent serves as a carbon source for in-situ synthetic TiC and a process control agent, alloy powder is obtained through ball milling, the alloy powder is subjected to vacuum pre-sintering to remove gas and stress, then, the alloy powder is prepared into green bodies, units are subjected to assembling and sintering, and finally the TiC reinforced ultra-fine grain beta titanium and niobium based composite material is obtained through high-temperature ultrahigh pressure sintering. According to the preparation method, the process control agent serves as the carbon source for in-situ synthetic TiC, powder agglomeration and ball sticking and wall sticking situations in the ball-milling process are effectively relieved, the process control agent plays a role in refining the powder and increasing the powder yield, meanwhile TiC generated through low-temperature pre-burning is combined with high-temperature ultrahigh pressure sintering, the growth of grains is effectively restrained, the prepared TiC reinforced ultra-fine grain beta titanium and niobium based composite material is uniform in reinforcement body, fine in grain and high in density and meanwhile has the beneficial effects of being high in strength and plasticity and resistant to abrasion.

Description

technical field [0001] The invention belongs to the technical field of metal-based composite materials, and in particular relates to a method for preparing TiC-reinforced ultrafine-grained β-titanium-niobium-based composite materials. Background technique [0002] Titanium and titanium alloys have excellent properties of low density, high specific strength, corrosion resistance, high and low temperature resistance, and non-toxicity, and are widely used in aerospace, machinery, medical and other fields. Among them, β-titanium alloy has been widely studied because of its good plasticity, outstanding cold formability, and excellent corrosion resistance. Further improving the properties of titanium and titanium alloys, such as strength and wear resistance, will not only greatly promote their application, but also greatly reduce the weight of aircraft and automobiles and reduce energy consumption in the context of increasingly energy-constrained. Nanocrystalline / ultrafine-crysta...

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Problems solved by technology

The TiC reinforced titanium-based composite material prepared by this method has fine grains and high density. However, it is difficult to uniformly disperse nano-scale carbon nanotubes in tens of microns of titanium powder by ball milling. Therefore, the prepared TiC is very easy. There is an uneven distribution

The patent of Chen Yuyong et al. (CN201010178675.7) uses graphite powder as the carbon source of in-situ self-generated TiC, simply mixes graphite powder with titanium powder and other metal powders, and then cold-presses and induces smelting. In order to make the reinforcement evenly distributed, Two homogenization treatments, two forgings, one hot rolling, and two annealing treatments are also required. The process is complicated and the cost is high

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