Microwave Ball Milling Nano Tungsten Powder
Tungsten powder is the main raw material for the processing of powder metallurgy tungsten products and tungsten alloys. With the rapid development of the microelectronics industry, energy, aviation, machinery industry and other fields, the demand of ultrafine tungsten powder is increasing day by day.
At present, the main process methods of nano tungsten powder include hydrogen reduction, sol-gel, high energy ball milling, freeze-drying, molten salt electrolysis, self propagating high temperature reduction and spray drying fluidized bed. In order to solve the problem of preparing ultrafine tungsten powder, scholars have provided a processing technology for nanometer tungsten powder.
(1) Ceramic ball mill can be put into a microwave oven by placing a metal powder, a 10-20 micron blue tungsten or yellow tungsten powder, a ceramic ball with a particle size of 0.5 millimeters and the ratio of deionized water to a ceramic ball mill in a proportion of 1:5.
(2) The motor and microwave oven that start the ceramic ball can make tungsten trioxide reduce to tungsten oxide at 500~700°C.
(3) At 700~900°C, tungsten oxide is reduced to tungsten powder. Reduction is often carried out in tubular electric furnace or rotary furnace.
(4) The tungsten based alloy oxide mixed powder was reduced and the tungsten carbon reduction method was used. The reduction temperature was higher than 1050°C, the atmosphere was hydrogen atmosphere and hydrogen, and the ultrafine tungsten based alloy powder less than 0.05μm was obtained.
The tungsten based alloy oxide was prepared by microwave mechanical ball milling, and then the tungsten based alloy oxide was reduced. The nanometer superfine tungsten based alloy powder was obtained. It not only greatly reduced the high temperature of nano oxide powder, but also successfully solved the serious pollution in dry ball milling and the easy agglomeration of the powder.
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