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.
湿膨胀系数用于预报谷物堆密度和研究谷粒应力裂纹产生原因等研究。
The hydroscopic expansion coefficient of grains is an important physical parameter for prediction of bulk densities and study of internal stresses of grain kernel during adsorption and desorption.
热冲击是由于炉管在某些部位温度变化大，炉管和结焦物的热膨胀系数不同，而产生较大的温差应力，使炉管产生裂纹。
Because of large temperature differences in some local tubes and different expansion coefficients, large stresses of temperature difference are produced and brings about cracking in tubes.
热冲击是由于炉管在某些部位温度变化大，炉管和结焦物的热膨胀系数不同，而产生较大的温差应力，使炉管产生裂纹。
Because of large temperature differences in some local tubes and different expansion coefficients, large stresses of temperature difference are produced and brings about cracking in tubes.
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