Powder metallurgy method is the preparation
of conventional coagulation conditions is difficult to obtain the structure of
the materials, functional materials and composite materials. Compared with the
melting method, powder metallurgy method can guarantee the stability of alloy
has a uniform organization and performance. It can reduce the work even without
cutting.
Usually can use smelting production of
products, also can use the method of powder metallurgy production. Although the
artificial environment of high temperature enough to make any high melting
point metal (W and Mo) melt, but from point of view, the cost of production and
efficiency are difficult to replace powder metallurgy technology.
At present, the mainstream of pure Molybdenumand Molybdenum alloy products forming method for powder metallurgy. Mo powder
metallurgy process including basic pulverizing, forming and sintering process.
Each working procedure for the final Mo has direct influence to the sintering
products and its subsequent processing. In powder source is selected, forming
and sintering will be decided and the key factor affecting the quality of
sintered products.
In the aspect of forming, the main
influence factors are pressing pressure, forming agent, one forming or more
forming and injection molding, forming soft mode, different forming methods
such as steel. So far, the Mo powder compacting process also study is less.
In the production of powder metallurgy,
compact density of sintering exhaust, complicated and will have a direct effect
on the densification process. According to different Mo powder, ideal compact
density is obtained by controlling the size of the suppression of pressure.
With the increase of pressing pressure, compact density also increases
accordingly, but Mo powder in cold isostatic pressing down the mathematical
relationship between the thrust pressure and density of the billet is not
clear. This gives Mo powder compacting pressure in the process of enterprise
production bring certain difficulty choices.
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