Kinetics of Mullitization from Polysilsesquioxane and Boehmite Precursors

IF 1.5 4区材料科学 Q3 MATERIALS SCIENCE, CERAMICS

Transactions of the Indian Ceramic Society Pub Date : 2021-01-02 DOI:10.1080/0371750X.2020.1869101

R. Anand, Anshuman Mohanty, S. Behera

引用次数: 0

Abstract

Mullite ceramics was synthesized using boehmite (-AlOOH) as alumina source and polymethysilsesquioxanes (PMS), a novel class of preceramic polymer, as silica source. Quantitative mullitization was calculated from the X-ray diffractograms of powder samples of appropriate stoichiometry of the precursors calcined for various holding times between 1200o and 1300oC, using Rietveld analysis, and the kinetics of phase formation was studied. The rate constant and activation energy of mullitization was calculated by the Johnson-Mehl-Avrami equation. This approach holds great potential for the commercial use of polymeric silica precursor for the fabrication of highly pure mullite and other silicate systems for various application such as thermal and environmental barrier coatings. GRAPHICAL ABSTRACT

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倍半硅氧烷和Boehmite前驱体的莫来石化动力学

以薄水铝石(-AlOOH)为氧化铝源，以新型预陶瓷聚合物聚甲基硅氧烷(PMS)为硅源，合成莫来石陶瓷。采用Rietveld分析方法，从不同化学计量的前驱体在1200 ~ 1300℃范围内煅烧不同保温时间的粉末样品的x射线衍射图中计算出定量的多来化反应，并研究了相形成动力学。用Johnson-Mehl-Avrami方程计算了反应的速率常数和活化能。这种方法具有巨大的商业潜力，用于制造高纯度莫来石和其他硅酸盐体系，用于各种应用，如热和环境屏障涂层。图形抽象

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来源期刊

Transactions of the Indian Ceramic Society 工程技术-材料科学：硅酸盐

CiteScore

2.40

自引率

8.30%

发文量

审稿时长

2.3 months

期刊介绍： Transactions of the Indian Ceramic Society is a quarterly Journal devoted to current scientific research, technology and industry-related news on glass and ceramics. The Journal covers subjects such as the chemical, mechanical, optical, electronic and spectroscopic properties of glass and ceramics, and characterization of materials belonging to this family. The Editor invites original research papers, topical reviews, opinions and achievements, as well as industry profiles for publication. The contributions should be accompanied by abstracts, keywords and other details, as outlined in the Instructions for Authors section. News, views and other comments on activities of specific industries and organizations, and also analyses of industrial scenarios are also welcome.

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