Tungsten Carbide Ball Processing

The tungsten carbide powder and powdered cobalt metal are mechanically mixed to form a uniform combination. To this combination is added a polymer or wax that acts as a mechanical binder in the pre-sintered stage. A carefully measured volume of this combined powder is compressed by a double acting press to form the tungsten carbide ball blank, or pre-form. The binder is removed by placing the preformed parts in a vacuum chamber and raising the temperature. The binder out gasses and is trapped down stream as a liquid.

Next, the combined tungsten carbide and cobalt pre-forms are sintered or fused into a solid mass by heating them to a high temperature in a vacuum or hydrogen atmosphere furnace.

Some tungsten carbide ball sizes are Hot Isocratic Pressed or hipped. The newest procedure is to Sinter-HIP the parts in a single operation. Using micro size diamond dust, they are then finished lapped and polished to final size and microinch roundness with a sub-microinch surface finish.


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