放电等离子烧结试样中温度分布的计算及应用  

Calculation and application the temperature distribution of sample during SPS

作　　者：刘雪梅[1] 宋晓艳[1] 张久兴[1] 赵世贤[1] 魏君[1] 

机构地区：[1]北京工业大学材料学院,新型功能材料教育部重点实验室,北京100022

出　　处：《功能材料》2007年第A10期4137-4139,共3页Journal of Functional Materials

基　　金：国家自然科学基金资助项目（50401001;50671001）

摘　　要：在电流分配模型的基础上，建立了用于计算SPS过程中试样、模具和压头温度升高比例的计算模型，并将其用于WC—Co硬质合金烧结过程的计算。模拟结果表明WC—Co的SPS过程中除了当试样电阻率较大，相对密度较小时在试样上分配的电流小于模具之外，试样上分配的电流大于模具；试样的温度升高大于模具，小于压头，因此能量由压头和试样向模具传递。实验证明了模具测定温度低于试样温度的理论预测结果。Based on the calculation of current distribution, a model has been developed to simulate the temperature increasing of sample, die and punch during SPS process. The model is used to predict the temperature increasing when WC-Co sample sintered. The simulation results show that most of the current passed through the WC-Co sample except the sample has high electric resistivity and low relative density; there is a higher temperature increasing in sample than in die and lower than in punches, so the heat transfer from the WC-Co sample and punches to die. By the modeling and experimental studies, the measured temperature of the center of die is lower than the sample＇s.

关 键 词：放电等离子烧结 电流分配 温度升高 WC—Co 

分 类 号：TB383[一般工业技术—材料科学与工程]