如果膨胀系数相差较大，在冷热交替的时候就会出现瓷层裂纹或爆瓷现象。
If there is a large difference in the coefficient of expansion, there will be cracks in the ceramic layer or the phenomenon of exploding porcelain in the alternating heat and cold.
经分析与实体零件的宏观与微观组织观察，此现象是因为还原介质渗入，引起合金体积膨胀而产生引力，造成应力裂纹。
Being the reducing medium, the volume expansion of alloy brings gravitation and crack through analysis and observation of accessory's macro-and micro structure.
微裂纹对降低陶瓷材料的平均膨胀系数有一定作用，但同时又降低了材料的机械强度。
The microcracks have certain effects on reducing the average thermal expansion coefficient, nevertheless they decrease the mechanical strength of the ceramics.
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