Effects of Processing Technology on Property and Microstructure of Rare Earth Containing Ceramic Composite
来源期刊：JOURNAL OF RARE EARTHS2004年增刊第3期
论文作者：XU Chonghai
Key words：rare earths; ceramic composite; processing technology; property; microstructure;
Abstract: Effects of processing technology on the properties such as relative density, flexural strength, fracture toughness, hardness, etc. and the microstructure of rare earth yttrium containing Al2O3/(W, Ti)C ceramic composite were experimentally investigated. It suggests that different processing parameters can undoubtedly result in different microstructures and different mechanical properties of the material. Under the experimental conditions, the suitable hot pressing temperature is 1720 ～ 1780 ℃, the time duration is 10 ～ 30 min and the hot pressing pressure is 30 ～ 35 MPa. The corresponding relative density can even be higher than 98 %. With SEM and TEM observation, each phases in the ceramic material is found to be in fine grains and distribute homogeneously. Typical fracture feature of the material is the mixture of both intergranular and introgranular fracture. Additionally, the existence of rare earth yttrium containing nanometer or sub-micron meter sized ceramic grains, dislocations and spontaneous microcracks can also contribute to the further improvement of the mechanical properties of the ceramic composite.
XU Chonghai1
(1.School of Mechanical & Electronic Engineering, Shandong Institute of Light Industry, Jinan 250100, China)
Abstract:Effects of processing technology on the properties such as relative density, flexural strength, fracture toughness, hardness, etc. and the microstructure of rare earth yttrium containing Al2O3/(W, Ti)C ceramic composite were experimentally investigated. It suggests that different processing parameters can undoubtedly result in different microstructures and different mechanical properties of the material. Under the experimental conditions, the suitable hot pressing temperature is 1720 ～ 1780 ℃, the time duration is 10 ～ 30 min and the hot pressing pressure is 30 ～ 35 MPa. The corresponding relative density can even be higher than 98 %. With SEM and TEM observation, each phases in the ceramic material is found to be in fine grains and distribute homogeneously. Typical fracture feature of the material is the mixture of both intergranular and introgranular fracture. Additionally, the existence of rare earth yttrium containing nanometer or sub-micron meter sized ceramic grains, dislocations and spontaneous microcracks can also contribute to the further improvement of the mechanical properties of the ceramic composite.
Key words:rare earths; ceramic composite; processing technology; property; microstructure;
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