Preparing method for ultra-fine high-purity Ti2AlNb alloy powder

Abstract

The invention provides a preparing method for ultra-fine high-purity Ti2AlNb alloy powder. The preparing method comprises the following steps that 1, components of a Ti2AlNb base alloy are used as ingredients and smelted into a Ti2AlNb alloy bar; 2, finish turning is carried out on the smelted Ti2AlNb alloy bar, the diameter of a processed electrode bar ranges from 10 mm to 100 mm, and the length ranges from 100 mm to 1000 mm; 3, the electrode bar is loaded into a reaction chamber, the reaction chamber is vacuumized, and helium or argon or helium and argon mixed gas is introduced into the reaction chamber; 4, plasma gun powder of PREP powder manufacturing equipment ranges from 100 kW to 300 kW, a plasma torch comprises a tungsten cathode and a copper anode, the electrode bar is not used as an electrode, the end of the electrode bar is heated to be melted uniformly, atomized drops are tossed out from the end of the electrode bar, the drops are cooled fast in an inert gas environment to form spherical particles, and the spherical particles drop into a bottom collector of the reaction chamber; 5, prepared Ti2AlNb alloy powder is screened and packaged in the inert gas protection environment; 6, the Ti2AlNb alloy powder prepared through the method has the advantages of being ultra-fine, high in purity, high in spherical degree and low in oxygen content.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy preparation of light-weight and high-strength titanium-aluminum intermetallic compounds, and in particular relates to an ultrafine high-purity Ti 2 A method for preparing AlNb-based alloy powder. Background technique [0002] Ti 2 AlNb is an intermetallic compound alloy based on an ordered orthorhombic structure O phase, the composition is usually in the range of Ti-(18-30)Al-(12.5-30)Nb, and contains a small amount of alloying elements such as Mo, V and Ta . Because the long-range ordered superlattice structure weakens dislocation movement and high-temperature diffusion, the alloy not only has high specific strength and specific stiffness, but also has high-temperature creep resistance, high fracture toughness, good oxidation resistance, and thermal expansion coefficient. Low-level characteristics, so it has become the most potential new lightweight high-temperature structural materi...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a kind of, can solve traditional process preparation Ti 2 Problems such as segregation, defects, and difficulty in processing in the AlNb alloy process, as well as problems such as poor sphericity and purity of the alloy powder produced by the currently commonly used powder making method, which affect the performance after molding, the invention provides an ultrafine , high purity, high sphericity, low oxygen content Ti 2 The preparation method of AlNb alloy powder ensures the Ti after molding 2 AlNb alloy has uniform composition, fine structure and excellent performance, meeting the application requirements in the aerospace field

Images