Abstract
The microstructure evolution and densification kinetics of Al2O3/Ti(C,N) ceramic tool material during microwave sintering were studied. The density and grain growth significantly increases at the temperatures higher than 1400°C. The calculated kinetics parameter n indicates that volume diffusion is the main densification mechanism when the sintering temperature is below 1300°C, while grain boundary diffusion plays a leading role in the densification process when the sintering temperature is higher than 1300°C. The grain growth activation energy of Al2O3/Ti(C,N) composite is 48.82KJ/mol, which is much lower than those of monolithic Al2O3 in the microwave sintering and conventional sintering. The results suggested that the Al2O3/Ti(C,N) ceramic tool material with nearly full densification and fine grains can be prepared by two-step microwave sintering.
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