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Hierarchically Porous Ceramics from Diatomite Powders by Pulsed Current Processing
Author(s) -
Akhtar Farid,
Vasiliev Petr O.,
Bergström Lennart
Publication year - 2009
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2008.02882.x
Subject(s) - materials science , porosimetry , porosity , sintering , spark plasma sintering , scanning electron microscope , ceramic , composite material , particle (ecology) , chemical engineering , mineralogy , porous medium , chemistry , oceanography , engineering , geology
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° and 850°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°–750°C. Little fusion at the particle contact points occurred at temperatures below 650°C while the powder showed partial melting and collapse of both the interparticle pores and the internal structure at temperatures above 800°C.