Hierarchically Porous Ceramics from Diatomite Powders by Pulsed Current Processing
Hierarchically Porous Ceramics from Diatomite Powders by Pulsed Current Processing
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DOI：
10.1111/j.1551-2916.2008.02882.x
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发表时间：
2009-02-01
影响因子：
3.9
通讯作者：
Bergstrom, Lennart
中科院分区：
文献类型：
--
作者：
Akhtar, Farid;Vasiliev, Petr O.;Bergstrom, Lennart
采用脉冲电流法（PCP）制备了分级多孔陶瓷块体。在PCP或放电等离子体烧结期间，在600 ° C和850 ° C之间的温度下评价多孔陶瓷粉末的部分烧结行为。扫描电子显微镜和压汞法测量结果表明，PCP方法能够在700摄氏度至750摄氏度的温度范围内将氧化铝粉末粘合在一起，形成相对坚固的整体，而不会显著破坏氧化铝粉末的内部孔隙。在低于650 ℃的温度下，颗粒接触点处几乎没有发生熔融，而在高于800 ℃的温度下，粉末显示出颗粒间孔和内部结构的部分熔融和塌陷。
Hierarchically porous ceramic monoliths have been fabricated by pulsed current processing (PCP) of diatomite powders. The partial sintering behavior of the porous diatomite powders during PCP or spark plasma sintering was evaluated at temperatures between 600 degrees and 850 degrees C. Scanning electron microscopy and mercury porosimetry measurements showed that the PCP method was able to bond the diatomite powder together into relatively strong monoliths without significantly destroying the internal pores of the diatomite powder at a temperature range of 700 degrees-750 degrees C. Little fusion at the particle contact points occurred at temperatures below 650 degrees C while the powder showed partial melting and collapse of both the interparticle pores and the internal structure at temperatures above 800 degrees C.