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      • KCI등재

        Physico-mechanical behaviour of alkali and alkaline earth metal-containing mica glass–ceramics: a comparative evaluation

        Amit Mallik 한국세라믹학회 2020 한국세라믹학회지 Vol.57 No.5

        Mica glass–ceramics are known for their superior mechanical strength, fracture toughness and machinability. Crystallization, microstructure and mechanical behaviour of alkali and alkaline earth metal-containing mica glasses based on K 2 O/SrO/ BaO·4MgO·Al 2 O 3 ·6SiO 2 ·2MgF 2 composition were investigated by diff erential thermal analysis, X-ray diff raction, scanning electron microscopy and microhardness indenter. A distinct crystallization exotherm was observed in the diff erential thermal analysis curve.The crystallization peak corresponded to the formation of K-fl uorphlogopite for K-glass, Sr-fl uorphlogopite for Sr-glass, and Ba-fl uorphlogopite for Ba-glass. XRD results revealed that the above-mentioned formations were the major phases, while alpha hexacelsian, enstatite, and mullite were the minor phases in K-, Sr-, and Ba-glass–ceramics. SEM results indicated that the “house of cards” microstructure appeared in Sr-glass–ceramics at lower crystallization temperature than in the K- and Ba-glass–ceramics. The physico-mechanical properties of Ba- and Sr-glass–ceramics were compared with K-glass ceramics, and it was found that Ba-glass–ceramics possessed superior crystallization, microstructure and mechanical strength than the other two glass ceramics.

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