Temperature distribution for electrically conductive and non-conductive materials during Field Assisted Sintering (FAST)
Temperature distribution for electrically conductive and non-conductive materials during Field Assisted Sintering (FAST)
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DOI：
10.1016/j.jeurceramsoc.2008.09.015
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发表时间：
2009-05
影响因子：
5.7
通讯作者：
J. Räthel;M. Herrmann;W. Beckert
中科院分区：
文献类型：
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作者：
J. Räthel;M. Herrmann;W. Beckert
在现场辅助烧结技术(FAST)过程中，使用内部和外部两个高温计对两个不同位置的温差进行了研究。两种物质，一种导电的(碳化钨)和一种不导电的材料(96wt.%的氮化硅和2wt.%的氧化铝和氧化钇)被用来通过改变模具几何形状和加热速度来监测这两种高温计在加热、烧结收缩和保持时间期间的温差。结果表明，材料的导电性以及工具的设计和设置对温度分布有很大的影响。分析了氮化硅的α-β转变，预测了样品内部的径向温度分布。为了便于比较和可视化，引入了一个包含活塞运动的动态有限元模型来模拟烧结收缩。有了这一点，就可以模拟完全依赖于时间的快速运行。模拟的温度分布差异与实际温度测量和相分析结果吻合较好。
During Field Assisted Sintering Technology (FAST) the temperature differences at two different positions were investigated using two pyrometers, an internal and an external one. Two substances, an electrically conductive (tungsten carbide) and a non-conductive material (96wt.% silicon nitride with 2wt.% alumina and yttria) were used to monitor the temperature differences between both pyrometers during heating, sintering shrinkage and dwell time by varying die geometry and heating rate. It was shown that the temperature distribution is strongly influenced by the electrical conductivity of the material as well as by tool design and setup. The alpha–beta transformation of silicon nitride was analyzed to predict the radial temperature distribution within the sample. For comparison and for visualization a dynamical FE model including piston movement for simulating sintering shrinkage was introduced. With this, a complete time dependent FAST run could be simulated. The modeled differences in temperature distribution are in good agreement with real temperature measurements as well as phase analyses.