Tungsten Cobalt Alloy Production Using Tungsten Powder Coating

During production of tungsten cobalt alloy, to prevent sticking, aluminum oxide with ethanol is brushed to the boat. However, aluminum oxide will penetrate into alloy under high temperature will results in the uneven of bottom to enlarge the finish machining cost. At the same time, the service life of vacuum pump is shorter with absorption of aluminum oxide particle. This article introduces a tungsten cobalt alloy production using tungsten powder preparing method, it will realize the completely separation of tungsten cobalt alloy and graphite boat and will not affect quality of alloy.

Tungsten cobalt alloy production using tungsten powder coating manufacturing method:
A.Submicron tungsten powder preparation:
1.Disolve tungstic acid in distilled water, adding ammonium solution and heating, ammonium tungstate solution is obtained.
2. Quick freeze ammonium tungstate solution under 45~-50°C.
3. Transit ammonium tungstate into ultra freezing drying machine. After freezing out its appearance is like white cellular piece.
4. Smash the piece obtained from step 3.
5. Tungsten powder is obtained under 250~500°C by hydrogen reduction for 4~6 hours.

B. Preparing materials below:
PEG6000 10~20 parts.
Tween 80 5~10 parts.
Graphite glue 10~20 parts.
Anti-brasive carbon black 10~20 parts.
Submicron tungsten powder from step A 5~10 parts.
Water 30~50 parts.

C. Mixing tungsten powder and PEG6000.
D. Dissolve material in step C with distilled water.
E. Adding the rest material into solution of step D and stirring it evenly.

Advantages: This kind of tungsten cobalt alloy production using tungsten powder coating manufacturing method, use freezing tungsten powder to replace metal oxide powder, it has high purity, small grain size. Besides that, submicron tungsten powder produced by vacuum freezing drying method can absorbing other components when blended with coating due to its porosity inside. 

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