Tungsten Carbide Nozzle Grain Growth

The grain growth problem, which is an inevitable problem during WC-Co cemented carbide nozzles liquid phase sintering process. While there are two main patterns of the grain growth, one is WC particles growing uniformly, approach the growth is constant. The other one is some WC grains is growing in advance. However, these two patterns of the grain growth is not independent, and they can be existing and occurring in the same time.

Generally, to control the constant growth of grains and avoid the regional growth, which is able to ensure the density of the material. During the sintering process, the regional WC grain growth and become thick, which is the source of tungsten carbide nozzle cracks appearing. Therefore, adds appropriate amount of the WC powder grain growth inhibitors, which can be beneficial for suppressing the growth of grain and improving the lifespan.

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