在建立电场活化烧结(field activated sintering, FAS)过程模型基础上, 对FAS工艺制备MoSi2-SiC复合材料的温度场进行了有限元模拟. 结果表明, 在FAS过程中, 模具-试样系统中的温度场特性是电场Joule热、体系化学反应热与模具传热效应的综合结果. 在烧结过程中, 由于Joule热与化学热的叠加作用, 试样中心温度最高, 并沿径向与轴向形成温度梯度, 从而在晶粒尺寸与致密化程度方面影响合成材料的组织均匀性. 此模拟结果为温度梯度的合理控 制提供了理论依据, 有助于获得组织均匀、晶粒细小且致密性高的复合材料.
Field Activated Sintering (FAS) modeling was made and finite element simulation was done by means of computer aided finite element method. The results show that FAS temperature field was determined by an interaction among Joule heating of electric field, heat released by chemical reaction, and heat transferring characteristics of die-specimen system. Due to overlap of heats by Joule effect and chemical reactions, the highest temperature was in the center of the sample and a radius temperature gradient was established. That significantly took effects to uniformity of microstructure and densification degree. Therefore, it is important to control temperature gradient within the sample of FAS to prepare dense and fine grained bulk materials.
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