摘要
采用ＸＲＤ法研究了摩尔分数为２．０％，２．７５％，３．０％Ｙ２Ｏ３稳定ＺｒＯ２陶瓷经不同的微波加热工艺下相变行为，研究结果表明控制处理温度和时间，可使材料获得较高的可相变四方相量及其断裂强度，最佳处理温度和保温时间分别为１０００～１２００℃和１０ｍｉｎ，研究分析表明可相变四方相含量改善并导致材料强度的提高的微观机理在于微波电磁场对瓷体内部Ｙ３＋置换Ｚｒ４＋后形成电荷不平衡而发生作用，重新对稳定剂的非均匀分布进行调整，强化富钇壳层而对ｔ－ＺｒＯ２施加了附加约束力。
The behaviour of phase transformation determined by XRD method in zirconia ceramic stabilized with Y2O3 of mole fraction of 2.0%, 2.75%, 3.0% under conditions of different process of microwave heating is investigated. The results indicate that the amount of transformable tetragonal phase and fracture strength of YTZP ceramic have greatly increased with the parameter control of temperature and time under microwave heating, and two optimal parameters of temperature and time are obtained to be 1000~1200℃ and 10min respectively. Furthermore, The causes of the improvement in transformable phase, which enhance the mechanical properties of ceramic, are analyzed, and it is interpreted that the interaction between electric magnetic field of microwave and electricity being out of balance with the substitution of Y3+ for Zr4+ in ceramic, revises the original microstrctural distribution of stabilizer ion, and reinforces the rich yttrium layer, which exerts an extra constraint on tZrO2.
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
1998年第6期90-92,共3页
Journal of Tsinghua University(Science and Technology)
基金
国家自然科学基金
关键词
相变
增韧
陶瓷
Y-TZP陶瓷
微波处理
interaction of microwave field
transformation toughened ceramic
transformable tetragonal phase
stabilizer
