Abstract
The conventional calcination–reduction–carburization (CRC) process offers the potential to manufacture commercial WC powders with median SEM grain sizes below 0.5 μm (ultrafine grades). Strict process control and a high degree of automation have led to increased powder uniformity and high lot-to-lot reliability. The high potential and flexibility of the CRC process is shown by the development of tailor-made WC powders with regard to subsequent alloy manufacturing. R&D powders have successfully been processed in full-scale units exhibiting SEM grain sizes of 0.15– 0.20 μm . This paper discusses the powder characteristics of various ultrafine WC powder grades, stemming from the conventional CRC process. Analytical characterization include also field-emission SEM, bright-field TEM, EDX analysis and XRD-line broadening.
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