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A novel way has been reported to fabricate porous silica ceramics, which is based on the in-situ foaming process of densely packed silica poly-hollow microspheres (SPHMs) at elevated temperature and inert atmosphere. The results show that sintering atmosphere and temperature have great effects on the formation and evolution of the porous structure. The original holes inside or between SPHMs could...
Porous Si3N4-based ceramics with different pore morphologies were prepared choosing Si3N4 and Al2O3 poly-hollow microspheres (PHMs) as pore-forming agents. The phase compositions, morphologies and mechanical properties of the samples were investigated. The SEM results show that the intact Si3N4 and Al2O3 PHMs distribute uniformly in the green body. However, after the sintering process, the basal body...
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