Method for preparing molybdenum alloy material from molybdenum oxide surface modified modified metal powder

A molybdenum oxide and surface modification technology, which is applied in the field of alloy material preparation, can solve problems such as unsuitable dispersion, molybdenum powder agglomeration, serious powder cake sintering, etc., and achieve ideal diffusion speed and diffusion effect

Inactive Publication Date: 2013-11-27
SHANGHAI TRUER IND DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a method for preparing molybdenum alloy material by surface-modified metal powder of molybdenum oxide, which overcomes the defects that the powder cake is seriously sintered and the molybdenum powder is agglomerated and unsuitable for dispersion in the original method.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Preparation of alloy materials of molybdenum and copper

[0026] Raw materials: basic powder is iron, molybdenum oxide is molybdenum dioxide (particle diameter is 300 microns)

[0027] (1) Raw material premixing: uniformly mix the basic powder iron and molybdenum dioxide powder at a mass ratio of 3:1;

[0028] (2) Evaporation deposition: Place the mixed raw materials (loosely tiled or compacted blocks) on the carrier container (material boat, steel belt or other container), under the reducing atmosphere of hydrogen and nitrogen (volume 0.5:1) Heating up, the temperature is controlled within the range of 400-500°C, and kept for 2-6 hours to complete the evaporation deposition of molybdenum oxide, and the treated powder is crushed and heated again, and the operation is repeated twice;

[0029] (3) Reduction and diffusion: heat the evaporatively deposited powder to the range of 600-800°C in a reducing atmosphere of hydrogen, and keep it for 3-8 hours to realize the reduct...

Embodiment 2

[0031] Preparation of alloy materials of molybdenum and chromium

[0032] Raw materials: basic powder is chromium, molybdenum oxide is molybdenum trioxide (particle diameter is 150 microns)

[0033] (1) Raw material premixing: uniformly mix the basic powder chromium and molybdenum trioxide powder at a mass ratio of 1:1;

[0034] (2) Evaporative deposition: Place the mixed raw materials (loosely tiled or compacted blocks) on the carrier container (material boat, steel belt or other container), heat up in the reducing atmosphere of hydrogen, and control the temperature at 800-1000 In the range of ℃, keep it for 2-6 hours to complete the evaporation deposition of molybdenum oxide, and heat the treated powder again after crushing, so repeat the operation 3 times;

[0035] (3) Reduction diffusion: Heat the evaporated and deposited powder under a reducing atmosphere of hydrogen and nitrogen (volume 1:1) to a range of 900-1100°C and keep it for 3-8 hours to achieve the reduction of ...

Embodiment 3

[0037] Preparation of alloy materials of molybdenum, thulium and titanium

[0038] Raw materials: basic powder is thulium and titanium, molybdenum oxide is molybdenum dioxide (particle diameter is 100 microns)

[0039] (1) Raw material premixing: uniformly mix the basic powder thulium, titanium and molybdenum dioxide powder according to the mass ratio of 2:1:1;

[0040] (2) Evaporative deposition: Place the mixed raw materials (loosely tiled or compacted blocks) on the carrier container (material boat, steel belt or other container), under the reducing atmosphere of hydrogen and nitrogen (volume 1:0.5) Raise the temperature, control the temperature within the range of 500-700°C, keep it for 2-6 hours, complete the evaporation deposition of molybdenum oxide, heat the treated powder again after crushing, and repeat the operation twice;

[0041] (3) Reduction and diffusion: heat the evaporatively deposited powder to the range of 600-800°C in a reducing atmosphere of hydrogen, an...

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Abstract

The invention relates to a method for preparing a molybdenum alloy material from molybdenum oxide surface modified metal powder. The method comprises the following steps: evenly mixing the metal powder with molybdenum oxide powder, heating to 300-1100 DEG C under protection of a reducing atmosphere, finishing evaporation deposition of the molybdenum oxide; and heating the powder (subjected to evaporation deposition) to 600-1100 DEG C under protection of the reducing atmosphere, so as to realize reducing and diffuse pre-alloying of the molybdenum oxide. The molybdenum oxide is taken as a molybdenum source; based on the low-temperature gasification principle, the molybdenum oxide is condensed and deposited on basic powder particles after being evaporated under protection of the reducing atmosphere; the sediment of the oxide is reduced to form molybdenum; and diffuse alloying of the molybdenum is achieved by virtue of temperature control. The method is simple, wide in material source, and free of special requirements on equipment, and has a good industrial application prospect.

Description

technical field [0001] The invention belongs to the field of preparation of alloy materials, and in particular relates to a method for preparing molybdenum alloy materials by using molybdenum oxide surface modified metal powder. Background technique [0002] Powder metallurgy parts have been widely used due to their advantages of large quantities, high precision and low cost. Its application has penetrated into the manufacturing field of key auto parts. [0003] The production of powder is an important basis for the development of powder metallurgy industry. Usually powder metallurgy uses copper, nickel, molybdenum and chromium as metal alloying elements. The alloying methods of metal alloying elements are generally divided into two types: melting complete pre-alloying and diffusion partial pre-alloying. A homogeneous melt is formed, and then sprayed to achieve alloy powder with uniform composition; while the pre-alloying of the diffusion part is achieved by diffusion of s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/04C22C27/04
Inventor 肖爽怀
Owner SHANGHAI TRUER IND DEV
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