The pyroplastic deformation (PD) of porcelain is a key issue for reducing production loss. In this study, material design to realize both a low water absorption (WA) and low PD in alumina‐strengthened porcelain, which have a trade‐off relationship, was proposed. In this porcelain material design, a rigid microstructure composed of entangled needle‐like mullite crystals is formed by the addition of Gairome clay, which has the positive effect of suppressing PD but negatively affects densification. This was balanced by the controlling the amount and viscosity of the liquid phase in the porcelain fired at elevated temperatures with optimized quantities of added petalite and Gairome clay to obtain a low WA and low PD. As a result, a WA below 0.5% and PD index below 1.5 × 10⁻⁶ mm⁻¹ in a wide firing temperature range from 1194 to 1384°C were obtained for porcelain containing Amakusa clay at 37.8 mass%, Gairome clay at 17.0 mass%, petalite at 13.7 mass%, and alumina at 31.5 mass%.

中文翻译：

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瓣石和Gairome粘土的氧化铝增强瓷的低吸水率和热塑性变形

瓷的热塑性变形（PD）是减少生产损失的关键问题。在这项研究中，提出了在兼顾了折衷关系的氧化铝强化瓷中实现低吸水率（WA）和低PD的材料设计。在这种瓷器材料设计中，通过添加Gairome粘土形成了由纠缠的针状莫来石晶体组成的刚性微结构，这具有抑制PD的积极作用，但对致密化却有不利影响。通过控制在高温下烧制的瓷器中液相的数量和粘度，并添加优化数量的花瓣石和Gairome粘土，以获得低WA和低PD，可以达到平衡。结果，WA低于0.5％，PD指数低于1.5×10 ^-6  mm ^-1 对于包含37.8质量％的天草粘土，17.0质量％的Gairome粘土，13.7质量％的蓬松土和31.5质量％的氧化铝的瓷，在1194〜1384℃的较宽的烧成温度范围内得到了陶瓷。