The microcracks have certain effects on reducing the average thermal expansion coefficient, nevertheless they decrease the mechanical strength of the ceramics.
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 difference of the value of the real thermal expansion coefficient and the average thermal expansion coefficient, and the difference of thermal expansion among the given steel grades were analyzed.
分析了瞬时线膨胀系数与平均线膨胀系数的差异以及不同钢种间热膨胀的差异性。
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