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A kind of method for preparing coarse molybdenum powder

A molybdenum powder and powder technology, which is applied in the field of pre-compressed granulation to produce coarse molybdenum powder, can solve the problems of complex process, high production cost, and poor performance of molybdenum powder, and achieve simplified preparation process, improved strength, and reduced preparation cost. effect of difficulty

Active Publication Date: 2011-12-28
CHENGDU HONGBO INDAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0022] The purpose of the present invention is to provide a method for preparing coarse molybdenum powder in view of the problems of high production cost, complex process and poor performance of molybdenum powder in the prior art.

Method used

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  • A kind of method for preparing coarse molybdenum powder
  • A kind of method for preparing coarse molybdenum powder

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Embodiment 1: as figure 1 Shown, a kind of method for preparing coarse particle molybdenum powder comprises the steps:

[0040] A. Common molybdenum powder: MoO 3 After the powder is mixed in a weight ratio of 1.5:1, spray deionized water into the mixed powder according to the ratio of 4ml deionized water / 100g mixed powder, stir well and then mix for 60 minutes;

[0041] B, the mixture of step A is pressed into a billet by isostatic pressing, the pressure value of isostatic pressing is 100MPa, and the holding time is 100s;

[0042] C. Screen the pressed compact obtained in step B to obtain (-20 mesh, +180 mesh) prefabricated powder after crushing; after screening, return the oversize of +20 mesh to continue crushing, and return the undersize of -180 mesh to isostatic pressing suppress.

[0043] D. The prefabricated powder obtained in step C is subjected to hydrogen reduction, the reduction temperature is 750°C; the reduction time is 12h, and the hydrogen flow rate is 2...

Embodiment 2

[0045] Embodiment 2: as figure 1 Shown, a kind of method for preparing coarse particle molybdenum powder comprises the steps:

[0046] A. Combine ordinary molybdenum powder with MoO 2 After the powder is mixed at a weight ratio of 4:1, spray deionized water into the mixed powder according to the ratio of 8ml deionized water / 100g mixed powder, stir well and then mix for 30 minutes;

[0047] B, the mixture of step A is pressed into a billet by isostatic pressing, the pressure value of isostatic pressing is 100MPa, and the holding time is 114s;

[0048] C. Screen the pressed compact obtained in step B to obtain (-20 mesh, +180 mesh) prefabricated powder after crushing; after screening, return the oversize of +20 mesh to continue crushing, and return the undersize of -180 mesh to isostatic pressing suppress.

[0049] D. The prefabricated powder obtained in step C is subjected to hydrogen reduction, the reduction temperature is 970°C; the reduction time is 10h, and the hydrogen ...

Embodiment 3

[0051] Embodiment 3: a kind of method for preparing coarse particle molybdenum powder, comprises the steps:

[0052] A. Common molybdenum powder: MoO 3 After the powder is mixed in a weight ratio of 4:1, spray deionized water into the mixed powder according to the ratio of 8ml deionized water / 100g mixed powder, stir well and then mix for 30 minutes;

[0053] B, the mixture of step A is pressed into a billet by isostatic pressing, the pressure value of isostatic pressing is 100MPa, and the holding time is 114s;

[0054] C. Screen the pressed compact obtained in step B to obtain (-20 mesh, +180 mesh) prefabricated powder after crushing; after screening, return the oversize of +20 mesh to continue crushing, and return the undersize of -180 mesh to isostatic pressing suppress.

[0055] D. The prefabricated powder obtained in step C is subjected to hydrogen reduction, the reduction temperature is 970°C; the reduction time is 12h, and the hydrogen flow rate is 20L / h;

[0056] E, ...

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Abstract

The invention discloses a method for preparing coarse molybdenum powder. After mixing molybdenum powder:molybdenum oxide powder in a weight ratio of (4-0.67):1, the mixed powder is mixed according to the ratio of (4ml-8ml) / 100g mixed powder. Spray deionized water on the mixed powder, mix well and then mix for 30-60 minutes; press the mixture into a billet by isostatic pressing; the pressed billet is crushed and screened to obtain a prefabricated powder (-20 mesh, +180 mesh); the prefabricated powder is subjected to hydrogen Reduction, the reduction temperature is 750°C~970°C; the reduction time is 10h~12h, the hydrogen flow rate: 20L / h-30L / h; according to the ball-to-material volume ratio of 1.1~2.0, after ball milling the prepared molybdenum powder for 30min~60min, Sieve to get the desired product. The method of the invention has low production cost and simple process, and the prepared molybdenum powder has good performance.

Description

technical field [0001] The invention relates to a method for preparing molybdenum powder, in particular to a method for preparing coarse molybdenum powder by pre-compression granulation. Background technique [0002] As we all know, except for a few precious metals, metal materials will undergo chemical and electrochemical reactions with the surrounding medium and suffer from corrosion. In addition, the wear and tear caused by various mechanical actions on the metal surface is also extremely serious. Therefore, the development of metal surface protection and strengthening technology is a major issue of general concern to all countries. Molybdenum is widely used in the modern automobile industry for its excellent wear resistance, corrosion resistance and strain resistance. The direct use of molybdenum to manufacture such parts is expensive, and the preparation of molybdenum-based coatings on the surface of engineering materials not only meets the performance requirements, b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/22B22F1/00
Inventor 何庆春温宁兵
Owner CHENGDU HONGBO INDAL
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