Tungsten Carbide Nozzle Grain Growth Suppression

At present, the main way to inhibit grain growth Carbide nozzle WC powder is to add in an amount of grain growth inhibitor for controlling continuous and discontinuous situation WC grains growth. There are three methods of adding grain growth inhibitor: One is that adds in WC, Co and the inhibitor three kinds of powders at the same time during the powder wet grinding. Secondly, adds the inhibitor before W carbonizing. And the last one is to add grain growth inhibitor before WO2.90(WO3)reduction, which mix the inhibitor with the salt solution.

The first method is convenient and easily to achieve, which is suitable for industrial applications, but the inhibitory effect is worse than the other two methods. The second method, Cr element is sufficient on the WC subkingdom found in the carbonization process, and leads to the decomposition of WC particles, which can prevent WC grains from growing.
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