景德镇与潮州中温日用瓷坯热稳定性的研究

Thermal Stability Comparative Study on Medium Temperature Daily-use Porcelain Bodies from Jingdezhen and Chaozhou Areas

用XRF、热膨胀、TG-DTA、XRD、SEM和EDS等分析技术,对景德镇和潮州两个主要产瓷区代表性的两种中温日用瓷坯进行了研究,从组成、结构、性能等方面阐释了两种瓷坯热稳定性差别的原因。结果表明:景德镇中温瓷坯属于高硅低铝系统,热膨胀系数较高,而潮州中温瓷坯属于高铝低硅系统,热膨胀系数较低;潮州中温瓷坯的热稳定性远高于景德镇中温瓷坯的热稳定性,原因是由于潮州中温瓷坯的主晶相为晶形发育良好、相互交错呈人字形的纳米短柱状一次莫来石晶体,其在瓷坯中连续分布,起到增强增韧的作用,赋予潮州瓷坯优良的热稳定性。与之相比,景德镇中温瓷坯中主晶相为发育较差的鳞片状一次莫来石和大量残余石英,热稳定性较差。

XRF, dilatometry, XRD, SEM, EDS and TG-DTA were employed to investigate the two representative medium temperature daily-use porcelain bodies from Jingdezhen and Chaozhou. The great difference in thermal stability of the two porcelain bodies was analyzed from the points of view of compositions, microstructures and performances. The results show that Jingdezhen porcelain bodies are of high coefficient of thermal expansion due to their low aluminum and high silicon content; On the contrary, Chaozhou porcelain bodies with high aluminum and low silicon content have low coefficient of thermal expansion. The thermal stability of Chaozhou porcelain bodies is much higher than that of Jingdezhen porcelain bodies. The main crystalline phase of Chaozhou porcelain bodies was well- developed, crossed, and slender nano-rod-like primary mullite crystals, which were interweaved in the bodies. The continuous and interweaved mullite crystals strengthened and toughened the products, and gave Chaozhou porcelain bodies excellent thermal stability. However, the crystalline phases of Jingdezhen porcelain bodies were mainly poorly-developed scale-like primary mullite and a considerable amount of residual quartz, which gave Jingdezhen porcelain bodies poor thermal stability.