How are Tungsten Carbide Parts Made

Before a finished tool or component can be made, typically a blank needs to be made.  This is performed through a powder metallurgy and sintering process.
• Firstly a mould of the macro shape of the blank desired is made. This is made intentionally at a calculated larger size to accommodate the volumetric shrinkage (which can approach up to 50%) that will occur later in the sintering process.
• Powders are then prepared with an involved process of mixing and milling, paying attention to particle size and consistency, purity, quantity etc. This step has a significant effect on the “quality” of the overall blank produced.
• The prepared powders are then compacted into a solid “green” state blank with the use of high pressure press.  The green blank can then be handled and to some degree additional processes such as turning, drilling and milling can be performed on the item before it is sintered.
• The green parts are then put through a process of pre-sintering, sintering and Hot Isostatic Pressing (if specified) to remove the binder waxes, liquefy the binder and fully densify the cemented carbide. Shrinkage occurs during this process.
• The fully dense tungsten carbide blank may then be further finished by grinding, EDM wire cutting, or diamond polishing. For the most demanding high volume and hardest working production tools, tungsten carbide is a superior base material.
 

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