Journal ArticleDOI
Mullite for Structural, Electronic, and Optical Applications
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TLDR
Wiederhorn et al. as mentioned in this paper reviewed the current state of mullite-related research at a fundamental level, within the framework of phase equilibria, crystal structure, synthesis, processing, and properties.Abstract:
Mullite (3AI2O3. 2Si02) is becoming increasingly important in electronic, optical, and high-temperature structural applications. This paper reviews the current state of mullite-related research at a fundamental level, within the framework of phase equilibria, crystal structure, synthesis, processing, and properties. Phase equilibria are discussed in terms of the problems associated with the nucleation kinetics of mullite and the large variations observed in the solid-solution range. The incongruent melting behavior of mullite is now widely accepted. Large variations in the solid solubility from 58 to 76 mot% alumina are related to the ordering/disordering of oxygen vacancies and are strongly coupled with the method of synthesis used to form mullite. Similarly, reaction sequences which lead to the formation of mullite upon heating depend on the spatial scale at which the components are mixed. Mixing at the atomic level is useful for lowtemperature (<lOOO"C) synthesis of mullite but not for low-temperature sintering. In contrast, precursors that are segregated are better suited for lowtemperature (1250" to 1500°C) densification through viscous deformation. Flexural strength and creep resistS M Wiederhorn-contributing editorread more
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Porcelain—Raw Materials, Processing, Phase Evolution, and Mechanical Behavior
William M. Carty,Udayan Senapati +1 more
TL;DR: Porcelain represents the foundation of the ceramics discipline and one of the most complex ceramic materials as mentioned in this paper, and there remain significant opportunities for research and study, particularly in the areas of raw material understanding, processing science, and phase and microstructure evolution.
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Transparent ceramics: Processing, materials and applications
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TL;DR: Transparent polycrystalline ceramics have found various applications, such as laser hosts, infrared windows/domes, lamp envelopes and transparent armors, due mainly to their processing flexibility in fabricating items with large sizes and complex shapes and more importantly costeffectiveness as mentioned in this paper.
Journal ArticleDOI
The influence of heating rate on the thermal behaviour and mullite formation from a kaolin raw material
TL;DR: In this article, the thermal behavior of a Bio kaolin raw material (Bio) containing mainly well-crystallised kaolinite and muscovite minerals was studied in relation to heating rate, from 3 to 20°C min −1.
Journal ArticleDOI
Materials development and potential applications of transparent ceramics: A review
Zhuohao Xiao,Shijin Yu,Yueming Li,Shuangchen Ruan,Ling Bing Kong,Qing Huang,Zhengren Huang,Kun Zhou,Haibin Su,Zhengjun Yao,Wenxiu Que,Yin Liu,Tianshu Zhang,Jun Wang,Peng Liu,Deyuan Shen,Mathieu Allix,Jian Zhang,Dingyuan Tang +18 more
TL;DR: Transparent ceramics have various potential applications such as infrared windows/domes, lamp envelopes, opto-electric components/devices, composite armors, and screens for smartphones as discussed by the authors.
Journal ArticleDOI
Mullite: Crystal Structure and Related Properties
TL;DR: In this article, a review of the state of the art on single crystal mullite is presented, focusing on the crystal structure of mullite and its properties, such as elasticity, compressibility, strength, toughness, creep and thermal properties.
References
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Journal ArticleDOI
Microstructural design of toughened ceramics
TL;DR: In this article, the authors discute des mecanismes de renforcement des ceramiques par pontage des fissures a l'aide de trichites and d'autres types de renforcants discontinus.
Journal ArticleDOI
Ceramic and Glass‐Ceramic Packaging in the 1990s
TL;DR: In this paper, a broad overview of packaging involving interconnecting, powering, protecting, and cooling semiconductor chips to meet a variety of computer system needs is presented, both for high-performance and low-performance applications.
Journal ArticleDOI
Stable and Metastable Equilibria in the System SiO2-Al2O3
I. A. Aksaf,Joseph A. Pask +1 more
TL;DR: In this paper, concentration profiles of Al/sub 2/O/sub 3/ in diffusion couples made from sapphire and fused silica were used to determine the stable equilibrium phase diagram of the system.
Journal ArticleDOI
Characterization of the Spinel Phase from SiO2-Al2O3 Xerogels and the Formation Process of Mullite
Kiyoshi Okada,Nozomu Ōtsuka +1 more
TL;DR: Two kinds of xerogels were prepared by slow and rapid hydrolyses of tetraethoxysilane and aluminum nitrate nonahydrate dissolved in ethanol as discussed by the authors.
Journal ArticleDOI
The KaoIinite-Mullite Reaction Series: I, A Survey of Outstanding Problems
G. W. Brindley,M. Nakahira +1 more
TL;DR: A survey of the reaction series of metakaolin can be found in this paper, where the authors provide the necessary historical background for a new approach to their solution, and the present survey brings these problems into sharp focus.