Preparing method for powder metallurgy titanium alloy

Abstract

The invention relates to a preparing method for a powder metallurgy titanium alloy. The preparing method includes the following steps that TiH2 powder, Ti powder and other alloy elements serve as raw materials and are evenly mixed to be subject to compression molding, wherein the adding amount of TiH2 accounts for 3%-25% of the total mass of the raw materials; the TiH2 is heated in a high-vacuum environment to be decomposed and is sintered in a hydrogen atmosphere; then the temperature is reduced to 750 DEG C to 1000 DEG C, and vacuum pumping is conducted for hydrogen removing; and finally, the powder metallurgy titanium alloy product is obtained after cooling. According to the preparing method, the element H is added into the powder metallurgy titanium alloy in the form of titanium hydride, and the adding amount of the H is controlled by controlling the amount of the titanium hydride; and meanwhile, the organization structure of the sintered titanium alloy is adjusted by controlling the H removing temperature of the hydrogen atmosphere sintered titanium alloy, and the high-performance titanium alloy is obtained. Compared with a method without adding titanium hydride, the density of the alloy obtained in the preparing method is increased, and the tensile strength is increased.

Description

technical field [0001] The invention relates to an alloy preparation method, in particular to a powder metallurgy titanium alloy preparation method. Background technique [0002] Titanium and titanium alloys have been widely used in the manufacture of military products such as aerospace vehicles, ships and weapons due to their low density, high specific strength, corrosion resistance, high temperature mechanical properties, fatigue resistance and creep properties. , also has great application potential in the automotive, chemical and energy industries. In the biomedical field, titanium is non-toxic, light in weight, high in corrosion resistance and strength, and has excellent biocompatibility. It can be used as an implant for the human body. and surgical instruments, etc. [0003] At present, the preparation methods of titanium and titanium alloys are mainly through common plastic processing methods such as casting, and powder metallurgy methods. Because casting is easy to...

AI Technical Summary

Problems solved by technology

The titanium alloy solid-state hydrogenation method refers to the method of placing the titanium alloy sample in a high-temperature hydrogen atmosphere to diffuse hydrogen into the titanium alloy. During the hydrogenation process, the titanium alloy sample is always in a solid state. The main disadvantage of this method is that it is a titanium alloy. It is a solid state, so the hydrogen permeation time is longer for titanium alloy materials with larger thicknesses, and it is difficult to make hydrogen uniform in the interior of the titanium alloy.

However, the above two methods use gaseous hydrogen, which is extremely unsafe to operate.

The effect of hydrogen on the grain refinement of titanium alloys has been studied by many scholars, but its influence on the grain size and structure of sintered titanium alloys is rarely mentioned.

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