Effect of boric acid on the porosity of clay and diatomite monoliths

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• 作者：Maja Kokune&scaron ; oski^a ; ¹ ; ^{majako@vinca.rs" class="auth_mail" title="E-mail the corresponding author} ; Aleksandra &Scaron ; aponjić^a ; ¹ ; Miroslav Stanković^b ; Jelena Majstorović^c ; Adela Egelja^a ; Svetlana Ilić^a ; Branko Matović^a
• 关键词：A. Sintering ; B. Porosity ; D. Clays ; Diatomite ; Boric acid
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：42
• 期：5
• 页码：6383-6390
• 全文大小：1822 K

文摘

Porous silica ceramics were obtained at low forming pressure (40–80 MPa) and low sintering temperature (850–1300 °C) for 4 h in air. Boric acid was used as a low-cost additive, in the amount of 2 wt%. Relatively high porosities of nearly 40% and 65% are obtained for the samples of clay and diatomite pressed at 40 MPa, and sintered at 1000 °C, respectively. The samples sintered at 1150 °C and 1300 °C have the average pore size diameters in the range of macroporous for clay 0.2–10 μm and for diatomite 0.2–5 μm. X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, and mercury porosimetry measurements were employed to characterize of the obtained samples. Measurements of densities and open porosities by immersion technique were used, according to the Archimedes principle. The relations between mechanical characteristics of the samples formed by using different pressures and sintered at different temperature, were discussed.