Preparation method of high-temperature spherical molybdenum alloy powder

Abstract

The invention provides a preparation method of high-temperature spherical molybdenum alloy powder. The preparation method comprises the following steps: screening molybdenum, silicon, boron, zirconium and titanium powder particles without impurities on the surfaces according to the proportion of 86.9%-89.1% of Mo powder, 1.3%-1.6% of Si powder, 0.99%-1.1% of B powder, 2.8%-3.8% of Zr powder and 5.81%-6.6% of Ti powder, mixing materials in a solid-solid mixing manner, preparing pre-alloyed powder with uniform particles by utilizing mechanical ball milling or high-energy ball milling, performing hot isostatic pressing sintering on the ball-milled powder to obtain a molybdenum alloy blank, and then obtaining the spherical molybdenum alloy powder resistant to high-temperature oxidation with a plasma rotary atomization powder preparation process. The prepared molybdenum alloy powder has good toughness, crack generation can be inhibited, high-temperature oxidation resistance is achieved, and compared with a traditional powder preparation process, the molybdenum alloy powder has better fluidity and sphericity degree, thereby having wide application prospects and popularization value.

Description

technical field [0001] The invention relates to the field of powder metallurgy, and relates to a process method for preparing high-temperature molybdenum alloy spherical powder suitable for 3D printing. Background technique [0002] Molybdenum alloy is a refractory material with high melting point, high temperature strength and high hardness, and has very important application prospects in high temperature fields. However, due to its high melting point and high hardness, subsequent machining is difficult, and traditional processes can only realize simple configurations such as plates and bars, which limits the application of molybdenum alloys. [0003] 3D printing adopts the discrete + stacking method to increase the degree of freedom in manufacturing, especially for special-shaped, curved surfaces, and complex components. The input end of 3D printing is a spherical powder. At present, there are three molding processes in the preparation of spherical powders, mechanical gra...

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Problems solved by technology

When applied to refractory materials such as molybdenum alloys, mechanical granulation and gas atomization methods have their own shortcomings: the powder in the mechanical granulation method is physically bonded, and metallurgical bonding has not been achieved. It is obviously difficult to form high-quality molybdenum alloy parts in medium splashing; because argon gas is used to impinge on the rotating droplets in the gas atomization process, the powder is often covered with pores, resulting in too much hollow powder, and the particle size of the powder is larger than that of plasma rotating The atomization is much larger, not suitable for 3D printing

[0004] However, the plasma rotary atomization method has different process parameter requirements for different materials. At present, there is no plasma rotary atomization method for molybdenum alloys, especially molybdenum-silicon-boron-zirconium-titanium alloys.

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