Investigation of Aluminosilicate Crystallization behavior in SiO2-Al2O3 System

مهندسی متالورژی و مواد

Article 11, Volume 31, Issue 1 - Serial Number 21, March 2020, Pages 122-134   

Document Type: Original Articles

DOI: 10.22067/ma.v31i1.65481

Authors

maedeh nooriha; sara shoorvasi; sahar mollazadeh beidokhti^* ; alireza Kianirashid

Ferdowsi University of Mashhad

Abstract

The aim of this study is to achieve a monophasic mullite (3????????2????3.2????????????2), with stoichiometric ratio of (3:2) and non-stoichiometric ratios of (2: 1) and (3: 4) by sol-gel method. Tetraethylorthosilicate (TEOS) and aluminum nitrate nonahydrate (ANN) were used as main ingredients. After gelation process, all the samples were aged at ambient temperature for 17 days and then dried at two different temperatures. All prepared samples were heat treated at temperatures ranging from 600-1550 °C and cooled in the furnace. Heat treated samples were characterized with XRD analysis to identify the crystalline phases. SEM and FTIR analysis were also performed to evaluate the morphology and chemical configuration of crystalline phases, respectively. In stoichiometric samples and non-stoichiometric specimens with higher alumina content, the needle morphology of mullite were observed.

Keywords

Aluminosilicate Compounds; Stoichiometric and Non-Stoichiometric Ratio; Sol-gel

Supplementary Files

11-molazade - Revised.pdf

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