透辉石-叶腊石-粘土系统陶瓷的相组成和性能

Phase Compositions and Properties of Ceramics Diopside-Pyrophyllite-Clay System

关键词:  透辉石  陶瓷  低热膨胀系数  粘土  叶腊石  物相  晶相组成  实验证明  形貌  产物

Key words:  raw material,flexural strength,coefficient of thermal expansion

摘要:

研究了透辉石-叶腊石-粘土系统陶瓷中，透辉石、叶腊石、石英和粘土含量对烧成后陶瓷的晶相组成、吸水率、收缩率、抗折强度和热性能的影响．用XRD，SEM分析了陶瓷的晶相组成和形貌．根据测定的陶瓷热膨胀曲线，用Excel软件计算了陶瓷的热膨胀系数．实验证明，减少透辉石含量，增加石英含量，可使产物相中顽火辉石量减少，石英和莫来石相增加，从而提高陶瓷强度，降低热膨胀系数；适当调整透辉石和叶腊石的比例，可以增加产物相中微斜长石含量，得到满意的陶瓷热膨胀系数。

Abstract:

In the raw material of diopside-pyrophyllite-clay system, the content variation of diopside, pyrophyllite, clay gives rise to the variation of crystal phases and of ceramics properties, such as the water absorption, the shrinking percentage of green bodies, flexural strength, and the coefficient of thermal expansion. The crystal phases and morphology of the ceramics were analyzed by XRD and SEM. Based on thermal expansion curves, the coefficients of thermal expansion were calculated through Excel software. It is clarified that decreasing of diopside, and at the same time increasing of quarts in the formulation diminish enstatite and enhance the quarts and mullite in the product, which results in higher mechanical strength, but lower thermal expansion. An appropriate proportion of diopside and pyrophyllite in the formulation can result in more feldspar in the product, which induces a satisfying thermal expansion.