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Special process of cemented carbide

wallpapers News 2021-01-27
Tungsten carbide powder is obtained by carburizing tungsten powder. The characteristics of tungsten carbide powder (especially its particle size) mainly depend on the particle size of raw tungsten powder and the temperature and time of carburizing. 

Pulverizing technology of cemented carbide tool materials
The processing conditions of the mixed grinding of tungsten carbide powder and metal bond are also crucial process parameters. The two most commonly used grinding techniques are ball milling and superfine grinding. These two processes can make the powder material uniformly mixed and can reduce the particle size. In order to make the post-pressed workpiece have sufficient strength, maintain the working shape, and enable the operator or manipulator to pick up the workpiece for operation, it is usually necessary to add an organic binder during grinding. The chemical composition of this bonding agent can affect the density and strength of the pressed workpiece. In order to facilitate the operation, it is best to add a high-strength bonding agent, but this will result in a lower compaction density and may produce lumps, resulting in defects in the final product.
 
After grinding, the powder is usually spray-dried to produce free-flowing agglomerates held together by the organic binder. By adjusting the composition of the organic binder, the fluidity and charging density of these agglomerates can be customized as required. By screening out coarser or finer particles, the particle size distribution of the agglomerate can be further customized to ensure that it has good fluidity when it is loaded into the mold cavity. When mixing and grinding tungsten carbide powder and metal binder to produce a certain grade of cemented carbide powder, various combinations can be used. The metal bond can be further improved by adding other alloy components. 
Concrete example
Adding ruthenium to WC-Co cemented carbide can significantly improve its toughness without reducing its hardness. Increasing the content of the binder can also improve the toughness of cemented carbide, but it will reduce its hardness. Reducing the size of tungsten carbide particles can increase the hardness of the material. But in the sintering process, the particle size of tungsten carbide must remain unchanged. During sintering, tungsten carbide particles combine and grow through a process of dissolution and precipitation. In the actual sintering process, in order to form a completely dense material, the metal bond must become liquid. 

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