Ultra-fast densification of boron carbide by flash spark plasma sintering
Ultra-fast densification of boron carbide by flash spark plasma sintering
复制标题
通过闪光放电等离子烧结实现碳化硼的超快速致密化
DOI：
10.1016/j.scriptamat.2016.02.012
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发表时间：
2016-04-15
影响因子：
6
通讯作者：
Fu, Zhengyi
中科院分区：
文献类型：
--
作者：
Niu, Bo;Zhang, Fan;Fu, Zhengyi
采用快速放电等离子烧结（FSPS）技术，结合快速烧结和电场辅助烧结技术，制备了致密化B4C陶瓷。B4C粉末在15.3MPa的施加压力下在1931 ° C下在1分钟内致密化至99.2%，具有有限的晶粒尺寸增加。TEM分析所得陶瓷的晶粒结构表明，焦耳加热和火花引发的脉冲电流是高度本地化的颗粒界面，并有助于显着的致密化的字符。我们发现，在高电流和低压力下的塑性变形是占主导地位的致密化机制。(C)2016爱思唯尔有限公司版权所有
A novel method, Flash Spark Plasma Sintering (FSPS), combining flash sintering and electric field assisted sintering was used to densify B4C ceramics. B4C powder was densified up to 99.2% in 1 min with limited grain size increase at 1931 degrees C under an applied pressure of 15.3 MPa. TEM analysis of the grain structure of the resulting ceramics suggests that the Joule heating and sparking initiated by the pulsed current are highly localized to particle interfaces and contribute significantly to the character of densification. We show that plastic deformation under high current and low pressure is the dominant densification mechanism. (C) 2016 Elsevier Ltd. All rights reserved.