Liquid Phase Sintering of Nano Silicon Carbide Prepared from Egyptian Rice Husk Ash waste | ||
| Egyptian Journal of Chemistry | ||
| Article 12, Volume 64, Issue 8, August 2021, Pages 4091-4097 PDF (451.2 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/ejchem.2021.67887.3480 | ||
| Authors | ||
| M. A. Zayed* 1; Mahmoud F. Zawrah2; Mustafa R. K. Ali2 | ||
| 1Cairo University, Faculty of Science, Chemistry Department, Giza, 12613 Cairo, Egypt | ||
| 2National Research Centre, Center of Excellence for Advanced Sciences, Nano Group - Refractories, Ceramics and Building Materials Department, 12622-Dokki, Cairo, Egypt | ||
| Abstract | ||
| Abstract The aim of the present research is to prepare well dense sintered nano-SiC. Two samples of Nano-silicon carbide prepared by pyrolysis of rice-husk ashes as starting materials. The first was fine (hand-ground) rice-husk ash, and the second was prepared by ball milled technology. The firing temperature to obtain well crystalline nano SiC was 1550oC. The effect of pyrolysis under vacuum atmosphere had been tested. Herein the liquid phase sintering is used as a good sintering technique. The oxides sintering additives (3 wt% Y2O3 and 7wt% Al2O3) play very crucial role in decreasing the apparent porosity and increasing the relative density of the sintered body if compared with that prepared without any oxide additives. Different sintering temperature firing range was applied here, and the optimum firing temperature that used to obtain well dense sintered SiC was 1950oC. With decreasing additive content, the consolidation of the materials became increasingly dependent on solid-state sintering. The microstructure underwent a transition from a microcrystalline matrix with nano-crystalline second phase (micro–nano) to a nano-crystalline matrix with nano-crystalline second phase (nano–nano) when the yttria and alumina content was lowered to 3 wt%. | ||
| Keywords | ||
| Key words: Rice husk; Nano SiC; Metal oxides additives; Liquid phase sintering; Sintered nano-SiC | ||
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