氮气是惰性气体，膨胀系数低，不轻易随环境温度上升而上升，可较长时间维持正常胎压，大大降低爆胎几率。
Nitrogen is the inert gases, low expansion coefficient, not easily with the environmental temperature rise for a long time, can maintain normal tire pressure, greatly reduce the flat tire.
在本研究中，还试图通过添加外加剂来降低堇青石的热膨胀系数。
During the study we tried to lower the thermal expansion coefficient of cordierite by adding additives.
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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