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Special molybdenum powder used for automatic forming and preparation method thereof

An automatic forming, molybdenum powder technology, applied in the field of special molybdenum powder, can solve the problems of reduced sintering power, no fluidity, low production efficiency, etc., and achieves the effect of appropriate particle size distribution, high bulk density and high production efficiency

Inactive Publication Date: 2012-07-04
XIAMEN HONGLU TUNGSTEN MOLYBDENUM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional reduced molybdenum powder has irregular particle shape, small powder particle size, usually less than 10μ, has no fluidity, and cannot be automatically pressed
However, the preparation of large-scale reduced molybdenum powder is more difficult, and will greatly reduce the sintering power, which is not conducive to the compact process of sintering products and energy saving and emission reduction.
In previous studies, the multi-step method is usually adopted, that is, after the initial molybdenum powder is sintered at a certain temperature, the molybdenum powder with high bulk density and fluidity is prepared by crushing ball milling or plasma spheroidization. The steps of these methods It is cumbersome, low production efficiency, and high equipment cost. If it is used in automatic compression molding, other means must be used to improve the lubrication performance of the powder

Method used

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  • Special molybdenum powder used for automatic forming and preparation method thereof
  • Special molybdenum powder used for automatic forming and preparation method thereof
  • Special molybdenum powder used for automatic forming and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 200 parts of pure water, 5 parts of polyvinyl alcohol, and 1 part of polyethylene glycol were stirred at 80-90° C. for 2 hours to prepare a forming agent solution. According to the requirements of MP-1 in the Q / JDC013-2002 standard, take 1000 parts of raw molybdenum powder, and mix the 1000 parts of raw molybdenum powder, 3000 parts of hard alloy balls, and the prepared forming agent equivalent to 20.6% of the weight of the raw material molybdenum powder Put 206 parts of the solution into a roller mill for wet grinding and mixing for 18 hours to prepare a molybdenum powder slurry. Turn on the induced draft fan, blower fan and heating system of the spray drying tower in sequence, and use pure water for pre-spraying. Set the air inlet temperature of the spray drying tower to 260°C and the air outlet temperature to 130°C, and set it up for later use. The molybdenum powder slurry is pumped into the spray drying tower through a diaphragm pump and a spray gun for drying and ...

Embodiment 2

[0035] 300 parts of pure water, 13 parts of polyvinyl alcohol, and 2 parts of polyethylene glycol were stirred at 80-90° C. for 2 hours to prepare a forming agent solution. Take 1000 parts of raw material molybdenum powder according to the requirements of MP-1 in the Q / JDC013-2002 standard, combine these 1000 parts of raw material molybdenum powder, 3000 parts of stainless steel balls, and the forming agent solution 315% of the prepared material equivalent to 31.5% of the weight of the raw material molybdenum powder One part was put into a roller ball mill for wet grinding and mixed for 36 hours to prepare molybdenum powder slurry. Turn on the induced draft fan, blower fan and heating system of the spray drying tower in sequence, and use pure water for pre-spraying. Set the air inlet temperature of the spray drying tower to 265°C, and the air outlet temperature to 130°C, and set it up for later use. The molybdenum powder slurry is pumped into the spray drying tower through a ...

Embodiment 3

[0037] 500 parts of pure water, 25 parts of polyvinyl alcohol, and 4 parts of polyethylene glycol were stirred at 80-90° C. for 2 hours to prepare a forming agent solution. Take 1000 parts of raw material molybdenum powder according to the MP-1 requirement in the Q / JDC013-2002 standard, combine these 1000 parts of raw material molybdenum powder, 2000 parts of molybdenum balls, and the forming agent solution 529 of the prepared 52.9% of the weight of the raw material molybdenum powder One part was put into a roller mill for wet grinding and mixed for 10 hours to prepare molybdenum powder slurry. Turn on the induced draft fan, blower fan and heating system of the spray drying tower in sequence, and use pure water for pre-spraying. Set the air inlet temperature of the spray drying tower to 200°C and the air outlet temperature to 100°C, and set it up for later use. The molybdenum powder slurry is pumped into the centrifugal atomizing disc at the top of the spray drying tower thro...

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Abstract

The invention discloses a special molybdenum powder which is directly used for the automatic forming of precision devices of the machinery industry and the electronic industry. The invention is characterized in that the molybdenum powder comprises the following materials according to the parts by mass: 96.6-99.5 parts of primary molybdenum powder, 0.5-2.4 parts of polyvinyl alcohol, 0-0.4 part ofpolyethylene glycol, 0-0.5 part of metallic stearate and 0-0.15 part of ammonium polyacrylate. The molybdenum powder has good flowability, high apparent density and appropriate particle size distribution and has the self-lubricating action in the process of the automatic forming. The invention also discloses a preparation method of the special molybdenum powder, which comprises the processes: (1)forming agent solution is prepared by the polyvinyl alcohol, the polyethylene glycol, water and other additives; (2) wet grinding is carried out on the primary molybdenum powder, metallic balls and the forming agent solution by proportion in a ball milling tank to prepare molybdenum powder slurry; (3) spray drying is carried out on the prepared molybdenum powder slurry for granulation; (4) the prepared molybdenum powder is collected by a vibrating screen arranged at the discharge hole of a spray drying tower. The preparation method has the greatest advantages of the special molybdenum powder used for the automatic forming can be prepared by one step, the efficiency is high, the cost is low, and the industrialization and no pollution can be realized.

Description

technical field [0001] A special molybdenum powder prepared by a one-step method relates to a special molybdenum powder for automatic molding of precision devices in the machinery and electronic industries and a preparation method thereof. Background technique [0002] Powder metallurgy is an effective method for the production of precision metal devices in the machinery and electronics industries. Its advantages lie in the wear resistance, durability, high precision and low noise of the produced devices. It is suitable for various parts with complex shapes and difficult machining. At the same time, it can also save metal materials, reduce the amount of cutting processing, improve labor productivity, save production costs, reduce production costs, and improve production competitiveness. Fully automatic compression molding is a typical forming method of powder metallurgy. This method has high requirements on the particle size, fluidity and particle size distribution of the po...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/00B22F9/04
Inventor 陈昭军石涛赖亚洲于洋庄志刚
Owner XIAMEN HONGLU TUNGSTEN MOLYBDENUM IND CO LTD
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