High-alumina porcelain with the addition of a Li2O-bearing fluxing agent |
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| Authors: | M. Oberžan J. Holc M. Buh D. Kuščer I. Lavrač M. Kosec |
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| Affiliation: | 1. Laboratoire de Chimie de la Matière Condensée de Paris (UMR CNRS 7574), Chimie-ParisTech, 11 rue Pierre et Marie Curie, 75005 Paris, France;2. Saint-Gobain Recherche, 39 quai Lucien Lefranc, 93303 Aubervilliers, France;3. Eurokera, 1 bis avenue du Général-de-Gaulle, Chierry, 02400 Château-Thierry, France;1. College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, China;2. School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu, China;3. State Key Laboratory of Electronic Thin Films and Integrated Devices, Chengdu, China;4. National Engineering Research Center of Electromagnetic Radiation Control Materials, Chengdu, China;1. State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China;2. School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China;3. Center for Materials Research and Analysis, Wuhan University of Technology, Wuhan 430070, China |
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| Abstract: | We have studied the influence of increasing the amount of β-spodumene (LiAlSi2O6), as a Li2O-containing flux, on the phase composition, the microstructure evolution and the physical properties of high-alumina porcelain. Quartz reacts with β-spodumene in the temperature range 1150–1250 °C, forming lithium aluminium silicates with a larger amount of SiO2. The presence of lithium minerals contributes to a lower CTE for the fired bodies. At 1300 °C an improved flexural strength is achieved with compositions containing 1.0 or 1.2 wt.% of Li2O, as a result of a more uniform microstructure. With increasing amounts of Li2O the overfiring effect is greatly enhanced. The most favourable characteristics from an industrial perspective with regard to flexural strength and deformation during firing were attained by using a high-alumina porcelain composition containing 1.0 wt.% Li2O. |
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