Tungsten Carbide Nozzle Grain Growth Suppression V

Rare earth usually contains one or two kinds of Y, La, Ce, Pr, Gd, Nd, etc. And the main form of adding is rare earth metal, oxide or mixed rare earth. There are some improvements of rare earth: One is due to rare earth lively properties and easily combined with Oxygen nitrogen carbon and sulfur, tungsten carbide impurities will come into being rare earth compounds and distribute in the grain boundary, which prevent liquid Co phase from dissolving and moving grain boundary. Therefore, the region growth of WC grain has been suppressed and refines the particle.

The other one is due to the spherical compound and impurity elements combine to form a rare earth element, it played on the binder phase dispersion strengthening effect, which remove impurities further and purified grain boundaries. In addition, rare earth element can also reduce the sintering temperature of tungsten carbide nozzle, to reconcile the contradiction between grain growth and sintering density and remarkably improve the toughness and bending strength of tungsten carbide.

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