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Method for preparing special type molybdenum powder

A technology of special molybdenum powder and molybdenum powder, which is applied in the field of preparation of special molybdenum powder for thermal spraying, mechanical processing industry and precision device pressing. It can solve the problems of fluidity, loose ratio, and particle size that are difficult to meet the requirements, and achieve easy control of the production process. , reduce sintering energy consumption, and improve the effect of microscopic appearance

Inactive Publication Date: 2009-01-28
JINDUICHENG MOLYBDENUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the molybdenum powder prepared by the spray granulation process, due to the limitations of the process itself, its fluidity, loose ratio, and particle size are difficult to meet the requirements

Method used

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  • Method for preparing special type molybdenum powder
  • Method for preparing special type molybdenum powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Take 2kg of MP-1 molybdenum powder that meets the Q / JDC013-2002 standard for use, its average Fischer particle size is 3.20μm, and its bulk density is 1.04g / cm 3 ;Sinter and granulate the weighed molybdenum powder in a muffle furnace under the protection of hydrogen, the sintering temperature is 980°C, and the time is 5hr; the molybdenum powder after sintering and granulation is sieved and classified, and the molybdenum powder with similar particle size is sintered in DH-1080 Plasma equipment is used for high temperature spheroidization treatment. The working current of the plasma spheroidization equipment is 350 amperes and the working voltage is 70 volts; the spheroidized molybdenum powder is reduced under the protection of hydrogen in the muffle furnace at a temperature of 800 ° C for 6 hours; the reduced molybdenum powder The special molybdenum powder of the present invention is obtained by sieving and classifying.

[0030] The detection index of special molybdenum ...

Embodiment 2

[0033] Take 5kg of MP-1 molybdenum powder that meets the Q / JDC013-2002 standard for use, its average Fischer particle size is 3.60μm, and its bulk density is 1.10g / cm 3 ; Sinter and granulate the weighed molybdenum powder in a muffle furnace under the protection of hydrogen. The sintering temperature is 1100°C and the time is 6hr; Plasma equipment for high temperature spheroidization treatment, plasma spheroidization equipment working current 400 amperes, working voltage 80 volts; spheroidized molybdenum powder is reduced under the protection of hydrogen in the muffle furnace, the temperature is 850 ° C, and the time is 8 hours; the reduced molybdenum powder The special molybdenum powder of the present invention is obtained by sieving and classifying.

[0034] The detection index of special molybdenum powder is as follows:

[0035]

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Abstract

A method for preparing a special molybdenum powder relates to a method for preparing the molybdenum powder specially used for the industries of thermal spraying and machining as well as pressing fine apparatuses. The powder is characterized in that the preparing process includes the steps as follows: (1) sintering normal molybdenum powder for increasing the granularity; (2) grading the molybdenum powder, the granularity of which is increased; carrying out spheroidisation on the molybdenum powder with approximate granularity by a plasma device, then cooling and collecting the molybdenum powder; (3) reducing the molybdenum powder after being spheroidized, screening, grading and then obtaining the special molybdenum powder. The molybdenum powder prepared by the method of the invention has the advantages of good fluidity, simple technique, high finished product rate and relates to a technique for preparing the special molybdenum powder used in the fields of thermal spraying and pressing fine apparatuses.

Description

technical field [0001] A method for preparing special molybdenum powder relates to a method for preparing special molybdenum powder for thermal spraying, machining industry and precision device pressing. Background technique [0002] Metal powders are widely used in thermal spraying and welding, precision device pressing and other fields. The particle size and fluidity of the powder are crucial to its use effect. If the particle size is too large, it will affect the surface quality of the coating and the pressing density of the device; if the particle size is too small, the spraying efficiency will be low and the filling performance of the molybdenum powder will be poor. The fluidity of molybdenum powder has a great influence on its spraying effect and pressing performance, and the powder fluidity is closely related to its sphericity. Good sphericity means good fluidity, otherwise, poor fluidity. Therefore, in order to achieve good spraying effect and good pressing performa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/22B22F1/00
Inventor 陈强张常乐冯鹏发
Owner JINDUICHENG MOLYBDENUM CO LTD
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