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Densification Kinetics and Mechanism of β-SiC Pressureless Sintering

Yang Xi Jiang Dongltang Tan Shouhong Guo Jingkun (Shanghai Institute of Ceramics,Academia Sinica)  
Three kinds of β-SiC powders with different oxygen contents were used tostudy β-SiC pressureless sintering behavior.with additives of B_4C and C,respectively(Ⅰ)the exponent,n,exhibited 1/3 and 2/5 at the initial stage and 1/1.6 at theintermediate stage;(Ⅱ)the sintering activation energy exhibited 543—669kJ/mol,due to the oxygen contents.Grain growth obstructed the shrinkage after initialstage.A mechanism was suggested to explain β-SiC sintering process.
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