Liquid Film Capillary Mechanism for Densification of Ceramic Powders during Flash Sintering

被引：83

作者：

Chaim, Rachman ^{[1
]}

机构：

[1] Technion Israel Inst Technol, Dept Mat Sci & Engn, IL-32000 Haifa, Israel

来源：

MATERIALS | 2016年 / 9卷 / 04期

关键词：

flash sintering; spark plasma sintering; densification; melting; electric field; electric conductivity; ceramics; invasion percolation; THERMAL RUNAWAY; ELECTRIC-FIELD; PLASMA FORMATION; SPARK; ALUMINA; MODEL; TEMPERATURE; SYSTEM; NANOPARTICLES; GROWTH;

D O I：

10.3390/ma9040280

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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.

引用

页数：8

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