Near-zero sintering shrinkage in pottery with wollastonite addition |
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| Affiliation: | 1. Ceramic Research Centre of Saga University, 2441–1 Oono-otsu, Arita-cho, Nishimatsuura-gun, Saga 844–0013, Japan;2. Faculty of Art and Regional Design, Saga University, 1 Honjo-cho, Saga 840–8502, Japan;3. Saga Ceramics Research Laboratory, 3037–7 Hei Kuromuta Arita-Cho, Nishimatsuura-gun, Saga 844–0022, Japan;4. Centre of Advanced Instrumental Analysis, Kyushu University, Fukuoka 816–8580, Japan;1. Department of Research and Development, SHOFU INC., Higashiyama-ku, Kyoto, Japan;2. Department of Chemistry and Materials Technology, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto, Japan;3. Department of Mechanical Engineering, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto, Japan;4. Ceramic Physics Laboratory, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto, Japan |
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| Abstract: | The precise control of the geometry of pottery is a challenge owing to the undesirable shrinkage and deformation observed after firing. In this study, near-zero sintering shrinkage pottery (NZS) with the sintering shrinkage (SS) of < 2.0% and pyroplastic deformation index (PI) of < 1.5 × 10?6 mm?1 was developed with varying amounts of added alumina and wollastonite. Wollastonite promotes anorthite crystallisation, thereby preventing sintering shrinkage at ～1200 °C. The mechanism for the suppressed liquid-phase sintering of the pottery was also analysed. Moreover, NZS were obtained after firing at 1300 °C with a specific phase composition for suppressing the pyroplastic deformation. Thus, NZS was successfully prepared through liquid sintering from natural minerals. Therefore, this study provides a guide for the fabrication of earthenware, stoneware, unglazed porcelain and ceramic tiles with precise dimension and geometry. Additionally, it is also important for reducing the production loss in huge pottery and large-scale production by countering the sintering shrinkage. |
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| Keywords: | Near-zero sintering shrinkage Alumina-strengthened pottery Wollastonite Anorthite crystallisation Liquid-phase sintering |
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