Intermediate Si-Al spinel phase formation in phase transformation of diphasic mullite gel

✍ Scribed by A. K. Chakravorty

• Book ID: 104736168
• Publisher: Springer
• Year: 1993
• Tongue: English
• Weight: 576 KB
• Volume: 28
• Category: Article
• ISSN: 0022-2461
• DOI: 10.1007/bf00353188

✦ Synopsis

AI203 Si02 diphasic mullite gel (Si/AI = 1/3) has been synthesized by using AI(NO3)3"9H20 and Ludox in basic conditions. Its phase transformation behaviour has been studied by qualitative and quantitative X-ray diffraction techniques. The results indicate that a noncrystalline alumino-silicate phase forms together with the slow crystallization of Si-AI spinel phase of a mullite-like composition up to 1250 ~ Thereafter, it transforms suddenly to orthorhombic mullite around 1325 ~ Earlier studies, e.g. alkali leaching, and measurement of co-ordination number of aluminium in 1000~ heated diphasic gel, confirm Si-AI spinel formation as an intermediary phase.