【摘要】 根据微波加热的特点,采用二维稳态导热数值分析法,建立了导热相复合陶瓷微波烧结的传热模式.研究了导热相的浓度、导热相弥散分布状况、基质类型以及保温方式对复合陶瓷内部二维稳态温度场分布的影响,并设计了导热相SiC晶须复合TZP陶瓷的微波烧结致密化实验,对建立的复合陶瓷的微波烧结传热模式进行了验证.结果表明:导热相复合陶瓷设计时宜选取具有高导热系数的基体,保持导热相有较高的浓度,使导热相均匀分布于基体中,且微波烧结传热宜采用合适的保温设施.更多还原

【Abstract】 Based on the characteristic of microwave heating,the numerical heat-transfer model of two-dimensional stable-state heat conduction of microwave sintering for ceramics composites with heat conduction phases was built up and validated by the experiment of microwave sintering densification for SiCw/TZP ceramics. The prediction of the newly-established model is in accord with experimental results of composite ceramics such as SiCw/TZP ceramics. The influencing factors about two-dimensional stable-state temperature field distribution such as concentration and distribution of heat conduction phases,category of matrix and mode of thermal insulation are analyzed. The results indicate that matrix with high coefficient of thermal conductivity,heat conduction phases with high concentration,uniform distribution of heat conduction phases in matrix and appropriate thermal insulation equipment should be considered in the design of composite ceramics with heat conduction phases.更多还原