Processing of Fine-grained Tungsten Carbide is Immature

In recent years, a variety of new tool materials endless, but tungsten carbide cutting tools will still be widely used in the future for a long period of time, it is necessary to study the development of new materials preparation technology to further improve and increase the tungsten carbide tool material’s cutting performance.

The strength and abrasion resistance of tungsten carbide cutting tools can be improved by refinement of hard phase grain size, increase of hard phase inter-granular surface area and enhancement of inter-granular bonding force. When the WC grain size reduced to sub-microns, the hardness, toughness, strength, wear resistance, etc. can be increased, and the required temperature can be fully densified. General tungsten carbide grain size is 3 - 5μm, fine-grained tungsten carbide grain size is 1--1.5μm (micron), ultra-fine tungsten carbide grain size can be up to 0.5μm (Micron, nanoscale).

As the grain refinement process is still not mature enough, so in the sintering process of tungsten carbide sintering is easy to grow into coarse grains, and grain growth will lead to the general strength of the material decreased, a single coarse WC grains are often Causing an important factor in material fracture.

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