采用水淬法对以Na2O-B2O3-SiO2体系玻璃焊料连接的常压烧结碳化硅试条的抗热震性能进行了研究.对不同温度下淬火后接口以及断面处微观结构进行了比较与分析,并对比了不同淬火温度以及固定淬火温度为150℃时多次热循环后连接试条的残余弯曲强度.结果表明,对于单次淬火,当淬火温度为150℃时,由于热应力引起中间层内部微裂纹扩展,导致残余弯曲强度迅速降低到(152±28) MPa.淬火温度在150℃～320℃时,中间层内部裂纹保持在亚临界状态,相应弯曲强度基本保持在140 MPa.继续升高淬火温度至420℃时,裂纹进一步扩展,试条残余弯曲强度迅速降低至(32±8) MPa.对于多次热循环,当淬火温度固定在150℃时,经多次热循环,残余弯曲强度与热循环次数变化不明显,基本保持在120MPa左右,这说明在150℃以下淬火,连接试条具有较好的抗热循环冲击性能.
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