【摘要】 本文阐述了晶体的热膨胀与化学键及晶体结构之间的关系，以及晶体热膨胀的各向异性对多晶陶瓷体热膨胀的影响。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。更多还原

【Abstract】 The relations between thermal expansion and chemical bonds as well as the crystal structures have been revealed.The effect of the thermal expansion anisotropy of crystallites on the bulk expansion of the polycrystalline ceramics are discussed.The microcracks have certain effects on reducing the average thermal expansion coefficient,nevertheless they decrease the mechanical strength of the ceramics.更多还原