Preparation method of fine particle size and low oxygen spherical titanium and titanium alloy powder

Abstract

The invention provides a preparation method of fine particle size and low oxygen spherical titanium and titanium alloy powder. The preparation method comprises the following steps: forming molten titanium and titanium alloy liquid drops by adopting arc melting wires, then crushing the metal liquid drops into superfine fog drops by using supersonic speed airflows, and condensing the metal fog drops into the spherical titanium and titanium alloy powder under the surface tension effect of the fog drops. By adopting the arc melting wires, the spherical titanium and titanium alloy powder is prepared in a high-purity argon or helium spray atomization technology, so that the preparation method is short in technological process and low in energy consumption; moreover, the powder preparation process of melting and atomizing raw materials is carried out under the protection of an inert atmosphere, so that the high-activity titanium and titanium alloy powder can be effectively prevented from being polluted, and low oxygen and high purity of the prepared powder are guaranteed; in addition, the molten titanium and titanium alloy liquid drops are sufficiently atomized through three paths of supersonic speed airflows, so that the prepared powder is fine in particle size and higher in yield and has a higher practical value.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy preparation, and in particular relates to a preparation method of fine-grained low-oxygen spherical titanium and titanium alloy powder. Background technique [0002] Powder metallurgy is a near-net-shaping technology that directly forms powders to produce complex-shaped parts. Powder metallurgy technology has the advantages of short process flow, high material utilization rate, fine and uniform structure, and isotropy. It is an ideal process for preparing high-performance, low-cost titanium and titanium alloys. In recent years, the further development and development of emerging manufacturing and processing technologies such as injection molding and additive manufacturing of titanium and titanium alloys have also promoted the further expansion of the application fields of powder metallurgy titanium and titanium alloys. Among them, high-quality low-oxygen spherical titanium and titanium ...

AI Technical Summary

Problems solved by technology

Since the rotation speed of the current bar is generally within 20,000 rpm, it cannot provide a higher centrifugal force for the dispersion and atomization of metal droplets. Therefore, most of the titanium and titanium alloy powders prepared by this technology now have a particle size of They are all between 100-250μm, and there are almost no powders ≤45μm

For the inert gas atomization technology, because titanium and titanium alloys are extremely active during the high-temperature melting process, most of the raw materials for melting titanium and titanium alloys are melted in a vacuum or inert atmosphere, using the induction melting method of water-cooled copper crucible, or using metal rods The direct induction melting of raw materials, the current pulverizing process of melting and then gas atomization has high energy consumption and high cost, and the yield of spherical titanium and titanium alloys with fine particle size (≤45μm) is low.

The above defects restrict the further development and wide application of powder metallurgy titanium and titanium alloy technology, so it is necessary to propose improvements

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