摘要
采用固相合成法制备CaZr4(PO4)6(calcium zirconium phosphate,CZP)陶瓷粉体。研究添加剂对CZP陶瓷烧结特性和热膨胀系数的影响以及CZP陶瓷的抗热冲击性能。通过X射线衍射分析、扫描电镜分析、热膨胀法和Archimedes排水法分别表征CZP陶瓷的晶体结构、微观形貌、热膨胀系数和体积密度。结果表明:CZP陶瓷的最佳烧结温度为1100℃,此时添加质量为2%MgO或ZnO的CZP陶瓷的显气孔率最低,分别为0.38%或0.23%;在室温(25℃)～600℃、热震40次后,CZP陶瓷的抗弯强度仅下降2.66%;随着烧结温度的提高(1 100～1 250℃),CZP陶瓷的平均线热膨胀系数由正值(2.14×10-6℃-1)变化为负值(-1.98×10-6℃-1)。
Calcium zirconium phosphate （CZP） ceramic powder was prepared by solid state reaction. Effect of additives on sinterability and thermal expansion coefficient of CZP ceramic was investigated, and thermal shock resistance of CZP ceramic was also studied. Crystal structure, microstructure, thermal expansion, and bulk density were measured by X-ray diffraction, scanning electron micro- scopy, dilatometry, and Archimedes method, respectively. Results indicate that apparent porosity of the CZP ceramic with mass frac- tion（the same below） of 2% MgO sintered at optimum temperature of 1 100 ℃ reaches the minimum value of 0.38%, and 0.23% for the samples with 2% ZnO added. Flexural strength of the CZP ceramic dropped by 2.66% after thermal shocking 40 times between 25 ℃ （room temperature） and 600 ℃. Average line thermal expansion coefficient of the CZP ceramic changes from a positive value （2.14 ×10–6 ℃ -1 ） to a negative value （–1.98 × 10 –6 ℃ –1 ） with the increase of sintering temperature.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2011年第12期1968-1973,共6页
Journal of The Chinese Ceramic Society
基金
江苏省科技支撑计划(BE2009169)资助项目
关键词
磷酸锆钙
烧结特性
平均线热膨胀系数
添加剂
抗热冲击性
calcium zirconium phosphate
sinterability
average line coefficient of thermal expansion
additive
thermal shock resistance
