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ZrO2-based ceramics were fabricated by the hot pressing sintering technology at 1550℃. Effect of HfN, HfC and HfB2 additives on their phase transformation, microstructure and mechanical properties were investigated. The m-ZrO2 was not discovered in ZrO2-HfC ceramics but discovered in ZrO2-HfN and ZrO2-HfB2 ceramics, which indicated that HfC potentiated the effect of Y2O3 stabilizer on inhibiting phase...
Effects of HfC addition on the microstructures and mechanical properties of TiN-based and TiB2-based ceramic tool materials have been investigated. Their pore number decreased gradually and relative densities increased progressively when the HfC content increased from 15wt% to 25wt%. The achieved high relative densities to some extent derived from the high sintering pressure and the metal phases....
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