Method for preparing molybdenum alloy powder containing nano rare-earth oxides

A rare earth oxide and nano-rare earth technology, applied in the field of powder metallurgy, can solve the problems of large size, low strength and toughness of molybdenum alloys, and achieve the effects of small grain size, avoiding the introduction of impurity elements, and low production cost

Inactive Publication Date: 2011-06-01
临沂明华管业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a kind of preparation method that contains the molybdenum alloy powder of nano-rare earth oxide, to solve because the rare earth oxide and molybdenum grain size in the traditional rare earth oxide doped molybdenum alloy powder are big, cause adopting this powder The technical problem of low strength and toughness of the prepared molybdenum alloy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Weigh 1000 grams of rare earth ammonium dimolybdate powder containing 0.2wt% lanthanum oxide, and roast it at 360° C. for 1.5 hours. During the roasting process, protect it with hydrogen gas. The pressure of the hydrogen gas is 0.3 Pa, and the flow rate is 0.5m 3 / h, ball mill and sieve the roasted material, the particle size of the powder is required to be less than 5μm, and then firstly reduce at 450°C for 1h, then at 950°C for 1.5h, and pass through the reduction process The pressure of hydrogen is 0.3Pa, and the flow rate is 0.5m 3 / h. The molybdenum alloy powder containing lanthanum oxide particles with an average size of 36nm and molybdenum crystal grains with a Fischer grain size of 2.3 μm can be obtained.

Embodiment 2

[0022] Weigh 1000 grams of rare earth ammonium dimolybdate powder containing 0.9wt% lanthanum oxide, and roast it at 370° C. for 1.5 hours. During the roasting process, hydrogen protection is carried out. The pressure of the hydrogen gas is 0.3 Pa, and the flow rate is 0.6m 3 / h, ball mill and sieve the baked material, the particle size of the powder is required to be less than 45μm, and then reduce at 480°C for 1.1h, then at 1050°C for 1.4h, the reduction process The pressure of hydrogen flow is 0.4Pa, and the flow rate is 0.6m 3 / h. Molybdenum alloy powder containing lanthanum oxide particles with an average size of 54nm and a molybdenum crystal grain Fisherman's particle size of 1.3 μm can be obtained.

Embodiment 3

[0024] Weigh 1000 grams of rare earth ammonium dimolybdate powder containing 1.2wt% lanthanum oxide and 1.2wt% cerium oxide, and roast it at 390° C. for 1.5 hours. During the roasting process, hydrogen protection is applied, and the pressure of the hydrogen gas is 0.3Pa, the flow rate is 0.8m 3 / h, ball mill and sieve the roasted material, the particle size of the powder is required to be less than 60μm, and then firstly reduce at 500°C for 1.2h, then at 1000°C for 1.3h, the reduction process The pressure of hydrogen flow is 0.4Pa, the flow rate is 0.8m 3 / h. Molybdenum alloy powder containing lanthanum oxide particles with an average size of 63nm and a molybdenum grain size of 3.0 μm in Fisherman's grain size can be obtained.

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Abstract

The invention discloses a preparation method of molybdenum alloy powder containing nanometer rare earth oxides. The method uses rare earth ammonium dimolybdate crystals as the material, and adopts the methods of roasting and hydrogen reduction to produce powder mixture containing nanoscale rare earth oxides and molybdenum metal, wherein, the scale range of the rare earth oxides in the molybdenum alloy powder is from 30 to 80 nanometers, and the rare earth oxides are all evenly dispersed on molybdenum powder matrix; the molybdenum granules are very fine, wherein, the Fisher particle size of the crystals is 1.0 to 4.0 um. The invention to prepare molybdenum alloy powder containing nanometer rare earth oxides has the characteristics of simple structure, low cost, small particle size and evendistribution of the rare earth oxides, etc, and ensures the high strength and high flexibility of the molybdenum alloy material prepared in the method.

Description

technical field [0001] The invention belongs to the field of powder metallurgy, in particular to a method for preparing molybdenum alloy powder containing nano rare earth oxides. Background technique [0002] At present, the research and development focus and development direction of the strengthening and toughening of molybdenum alloys are mostly based on the dispersion strengthening of doped second phase particles, especially the research on the addition of rare earth oxides is a hot field. Among them, oxide-doped molybdenum alloy is the most widely used molybdenum alloy. The preparation of this kind of doped molybdenum alloy is simpler and more convenient than the preparation of ASK doped molybdenum alloy, and the effect is more obvious. The existing research results show that the molybdenum wire doped with rare earth oxide has higher recrystallization temperature and room temperature strength than pure molybdenum wire, and has better high temperature anti-sag performanc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/22
Inventor 孙军张国君孙院军刘刚江峰丁向东
Owner 临沂明华管业有限公司
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