Near-zero sintering shrinkage in pottery with wollastonite addition. Issue 2 (February 2023)

• Record Type: Journal Article
• Authors: Hao, Dong; Akatsu, Takashi; Kamochi, Nobuaki; Inada, Miki; Shiraishi, Atsunori
• Is Part Of: Journal of the European Ceramic Society. Volume 43:Issue 2(2023)
• Page Start: 700
• Page End: 707
• Publication Date: 2023-02
• Subjects: NZS near-zero sintering shrinkage pottery -- PI pyroplastic deformation index -- SS sintering shrinkage -- XRD X-ray diffraction -- EDX energy-dispersive X-ray spectrometer; Near-zero sintering shrinkage -- Alumina-strengthened pottery -- Wollastonite -- Anorthite crystallisation -- Liquid-phase sintering; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2022.10.037
• Languages: English
• ISSNs: 0955-2219

Abstract

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.