Chaim Rachman
Department of Materials Science and Engineering, Technion-Israel Institute of Technology, Haifa 32000, Israel.
Materials (Basel). 2016 Apr 11;9(4):280. doi: 10.3390/ma9040280.
Recently, local melting of the particle surfaces confirmed the formation of spark and plasma during spark plasma sintering, which explains the rapid densification mechanism via liquid. A model for rapid densification of flash sintered ceramics by liquid film capillary was presented, where liquid film forms by local melting at the particle contacts, due to Joule heating followed by thermal runaway. Local densification is by particle rearrangement led by spreading of the liquid, due to local attractive capillary forces. Electrowetting may assist this process. The asymmetric nature of the powder compact represents an invasive percolating system.
最近，颗粒表面的局部熔化证实了放电等离子烧结过程中火花和等离子体的形成，这解释了通过液相实现快速致密化的机制。提出了一种通过液膜毛细管作用实现快速烧结陶瓷快速致密化的模型，其中液膜是由于焦耳热随后的热失控在颗粒接触处局部熔化而形成的。由于局部吸引毛细管力，局部致密化是由液体扩散导致的颗粒重排引起的。电润湿可能有助于这一过程。粉末压坯的不对称性质代表了一个侵入性渗流系统。
