FINITE ELEMENT MODELING OF TEMPERATURE DISTRIBUTION IN FIELD ACTIVATED SINTERING OF MoSi2-SiC COMPOSITE
FINITE ELEMENT MODELING OF TEMPERATURE DISTRIBUTION IN FIELD ACTIVATED SINTERING OF MoSi2-SiC COMPOSITE
复制标题
MoSi2-SiC 复合材料场激活烧结温度分布的有限元建模
作者：
在场激烧结MoSi2-SiC复合材料有限元模拟的基础上，对其温度分布进行了有限元模拟。结果表明，场激烧结MoSi2-SiC复合材料的温度分布是由电场焦耳热、化学反应放热和模具-试件系统内的换热共同决定的。由于焦耳效应和化学反应产生的热量重叠，样品的中心温度最高，形成了径向和轴向的温度梯度，显著影响了颗粒尺寸和致密化的微观结构的均匀性。模拟结果为温度梯度的控制提供了理论依据。这有助于制备致密和细晶的块状材料。
Finite element modeling of temperature distribution in field activated sintered(FAS) MoSi_2-SiC composite was made on the basis of modeling for FAS process.The results show that FAS temperature field is determined by a combined effect of Joule heat of electric field,heat released by chemical reaction,and transferring heat in die-specimen system.Due to overlap of heats produced by Joule effect and chemical reactions,the center temperature is the highest in the sample,a radius and axial temperature gradients are formed,which significantly affect the uniformity of mierostructure in the sizes and densifications of grains.The simulation results provide a theoretical support on temperature gradient controlling,which help to prepare dense and fine grained bulk materials.