A TiN-Al2O3 composite powder was synthesized by the floating-type fluidized-bed CVD. Al2O3 particles were floated in an N2/NH3 gas mixture, and TiCl4 was fed to deposit TiN. The composite powders obtained and the ceramics were examined by an electron probe microanalyzer (EPMA). The TiN content in the composite powder was controlled by the flow rate of carrier gas of TiCl4. It was deduced that the composite powder was formed by deposition of fine TiN particles onto Al2O3 particle surfaces, aggregating to about 3ƒÊm. Ceramic from the composite powder containing 12.5wt% TiN was conduc tive. Its microstructure suggested that TiN was uniformly dispersed as compared with mechanical mixing.
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