放电等离子烧结过程温度场及原子扩散

Temperature Field and Atom Diffusion in Spark Plasma Sintering

对放电等离子烧结不同材料过程中的温度场进行了理论分析和实验研究,发现在一定条件下样品内出现较大的温差,控制工艺参数可以降低温差。对放电等离子烧结过程中材料界面和颈部的原子扩散过程进行了研究,并与相同工艺条件下辐射加热烧结进行比较,表明放电等离子烧结过程促进了原子的扩散。

Temperature distribution in the sample and the die during the process of Spark Plasma Sintering （SPS） were studled both theoretically and experimentally. The temperature difference is inevitable in the samples in SPS. Under certain conditions, the difference may reach a few hundreds of degrees of centigrade. Controlling of processing parameters can decrease the temperature difference. The atom diffusion at the interfaces and necks of specimen under SPS was also investigated and compared with Hot Pressing （HP）. It was found that the atom diffusion in SPS is faster than that in HP, which indicates that SPS is more efficient.