添加剂对NZP族低热膨胀陶瓷热学性质的影响

以NZP族低热膨胀陶瓷Ca1-xBaxZr4(PO4)6(0≤x≤1)系列中的零膨胀组成Ca0.85Ba0.15Zr4P6O24为例,着重研究了不同添加剂对该零膨胀陶瓷的热膨胀异向性、平均热膨胀系数和导热性能的影响规律。实验结果表明,在烧结过程中添加质量分数1%SiO2或3%SiC均能够降低Ca0.85Ba0.15Zr4P6O24的热膨胀异向性,但与此同时,第二相的加入使Ca0.85Ba0.15Zr4P6O24的热膨胀系数有所上升。质量分数为1%～7%SiC晶须的加入反而导致NZP族陶瓷导热性能进一步降低,原因是SiC抑制了晶粒生长。

The Influences of Additives on the Thermal Properties of Low Thermal Expansion NZP Family Ceramic

The influences of additives on the thermal properties including anisotropy of the axial thermal expansion and average thermal coefficients as well as thermal conductivity of near-zero thermal expansion ceramic Ca0.85Ba0.15Zr4(PO4)6 belonging to NZP family were studied.The results indicate that the anisotropy of the axial thermal expansion of Ca0.85Ba0.15Zr4(PO4)6 can decrease by adding to 1%SiO2 or 3%SiC,therefore the thermal shock resistance can increase.However,the thermal expansion coefficient also increase with adding 1%-7%SiC additive,and this results in the poorer thermal conductivity of NZP ceramics because the grain size growth is limited during ceramic sintered.