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Method for preparing nanocrystalline Nb-W-Mo-Zr alloy powder

A technology of nb-w-mo-zr and alloy powder, which is applied in the field of preparation of nanocrystalline Nb-W-Mo-Zr alloy powder, can solve the problems of long ball milling time, etc., and achieves lower sintering temperature, uniform and fine particle size Effect

Active Publication Date: 2015-06-17
UNIV OF SCI & TECH BEIJING
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  • Summary
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Problems solved by technology

However, when using this method to produce niobium alloy powder, the ball milling time is longer, usually more than 40h

Method used

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  • Method for preparing nanocrystalline Nb-W-Mo-Zr alloy powder

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Experimental program
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Embodiment 1

[0020] Embodiment 1: Prepare nanocrystalline Nb-5wt%W-2 wt%Mo-1wt%Zr alloy powder with low temperature ball milling process

[0021] The first step is to use Nb powder with a purity of >99.8% and a particle size of -325 mesh; W powder with a purity of >99.9% and a particle size of 3 to 5 μm; Mo powder with a purity of >99.9% and a particle size of 1 to 2 μm; a purity of >99.5 %, Zr powder with a particle size of 4-8 μm is used as raw material.

[0022] In the second step, 4 pre-alloyed powders with a mass of 100 g were prepared according to the composition ratio of Nb-5wt%W-2wt%Mo-1wt%Zr.

[0023] The third step is to place the configured powder in 4 ball milling tanks made of heat-treated stainless steel, and put 20 hard alloy balls with diameters of 10mm, 8mm, and 6mm in each tank, and grind the tanks. Seal, repeat vacuuming and filling with high-purity argon 4 times.

[0024] The 4th step, ball mill jar is placed on the cryogenic ball mill that fills liquid nitrogen, ba...

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Abstract

The invention belongs to the field of powder material, and relates to a method for preparing nanocrystalline Nb-W-Mo-Zr alloy powder. The method performs high-speed ball milling in low-temperature environment of liquid nitrogen, powder easily obtains high-density dislocation, the alloying process is accelerated, thus the ball milling time can be greatly shortened, and the alloy powder with finer particle size than grain and powder is obtained. The average particle size of the Nb-5wt%W-2wt%Mo-1wt%Zr alloy powder prepared by the technology is 500nm, the average grain size is 9nm, and the alloying degree is 100%. The method provided by the invention has the advantages that the particle size of the prepared niobium alloy powder is uniform and fine, the alloy powder has a nanocrystalline structure, activated sintering in the powder metallurgy process can be realized, and the sintering temperature is lowered.

Description

technical field [0001] The invention belongs to the field of powder materials, and relates to a preparation method of Nb-W-Mo-Zr alloy powder, in particular to a preparation method of nanocrystalline Nb-W-Mo-Zr alloy powder. Background technique [0002] Niobium-based alloys are the lightest refractory metals with high melting point, strong corrosion resistance, and small thermal neutron interception surface. They can be used to manufacture key components of rocket engines, aircraft nozzles, satellites, and nuclear reactors. They are widely used in In the fields of aerospace, atomic energy, medical treatment and nuclear industry, etc., it is considered to be the most promising next-generation high-temperature structural material. [0003] At present, niobium-based superalloys are mainly manufactured by the traditional process of ingot casting-press processing-mechanical processing, which has disadvantages such as complex process, low material utilization rate, high cost, coa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/04
Inventor 曲选辉张德智秦明礼何新波刘烨章林贾宝瑞陈鹏起李睿
Owner UNIV OF SCI & TECH BEIJING