In-situ Reinforced SiC Ceramics

Abstract

Abstract: SiC ceramics with rod-like grains were obtained by pressureless sintering of β-SiC powders with Y₂O₃and Al₂O₃ as additives. The materials were densified based on liquid phase sintering mechanism. Thephase transformation of 3C→4H in SiC occurred during sintering, which was associated with the formationof rod-like grains. The mechanical properties of the materials depended on the aspect ratio of SiC grains,on the optimum, the maximum values of the flexural strength and fracture toughness reached 620MPa and 6.1MPa.m^1/2 respectively. The trajectory of indentation crack revealed that the crack deflection and grain-bridging sere the main toughening mechanisms due to the weak grain-boundary.

Key words: silicon carbide, rod-like grains, in-situ reinforcement

CHEN Zhongming,TAN Shouhong,JIANG Dongliaug. In-situ Reinforced SiC Ceramics[J]. Journal of Inorganic Materials.

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In-situ Reinforced SiC Ceramics

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