{"title":"Synthesis of mullite by a freeze-dry process","authors":"T.A. Wheat , E.M.H. Sallam , A.C.D. Chaklader","doi":"10.1016/0390-5519(79)90010-3","DOIUrl":null,"url":null,"abstract":"<div><p>A freeze-drying technique has been developed to synthesize fine-grained stoichiometric mullite (3Al<sub>2</sub>O<sub>3</sub> · 2SiO<sub>2</sub>) by doping a silica sol with an appropriate quantity of a one molar Al<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub> solution followed by spray freezing in liquid N<sub>2</sub> and freeze drying the mixture. The freeze-dried powder when calcined at 1400°C produced a single-phase stoichiometric mullite as determined by X-ray diffraction. The final product was very friable and could be easily broken down to a mean particle size of ∼7 μm (equivalent spherical diameter).</p></div>","PeriodicalId":100227,"journal":{"name":"Ceramurgia International","volume":"5 1","pages":"Pages 42-44"},"PeriodicalIF":0.0000,"publicationDate":"1979-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0390-5519(79)90010-3","citationCount":"12","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Ceramurgia International","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/0390551979900103","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 12
Abstract
A freeze-drying technique has been developed to synthesize fine-grained stoichiometric mullite (3Al2O3 · 2SiO2) by doping a silica sol with an appropriate quantity of a one molar Al2(SO4)3 solution followed by spray freezing in liquid N2 and freeze drying the mixture. The freeze-dried powder when calcined at 1400°C produced a single-phase stoichiometric mullite as determined by X-ray diffraction. The final product was very friable and could be easily broken down to a mean particle size of ∼7 μm (equivalent spherical diameter).
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