| 摘要: |
| 按照陶瓷板制备对收缩率、吸水率和断裂模数的目标要求，针对大型化陶瓷板生产中存在的强度低、吸水率偏高等问题，分别利用蓝晶石、焦宝石和针状硅灰石原料取代原配方中的煅烧铝矾土原料，改变生产配方中的化学组成和矿物组成，建立制备工艺条件与二次莫来石化反应过程的关系模型，以对比不同试样的性能，分析其吸水率偏高的形成机理.结果表明：在陶瓷板配方中引入煅烧铝矾土，可以减小烧成收缩，起到以莫来石相增强的作用，未完成的二次莫来石化反应是造成陶瓷板吸水率偏高、强度下降的主要原因；采用蓝晶石取代煅烧铝矾土后，因蓝晶石的莫来石化反应完成温度与陶瓷板烧成温度接近，从而使陶瓷板的断裂模数提升了183%，吸水率降低了562%，烧成线收缩率减小了92%. |
| 关键词: 二次莫来石化反应 陶瓷板 吸水率 |
| DOI：103969/j.issn1007 9629201806012 |
| 分类号: |
| 基金项目:蒙娜丽莎徐德龙院士工作站资助研究项目（ww20160023） |
|
| Effect of Secondary Mullitization Reaction on the Properties of Ceramic Plates |
|
XIAO Libiao1, XUE Qunhu1, LIU Yijun2, PAN Limin2, TONG Jifeng3
|
|
1.College of Materials and Mineral Resources, Xian University of Architecture and Technology, Xian 710055, China;2.MONALISA Group Co., Ltd., Guangzhou 528211, China;3.Academician Xu Delong Workstation of MONALISA Group, Guangzhou 528211, China
|
| Abstract: |
| Based on the target requirements of shrinkage, water absorption and rupture modulus of ceramic plates, the calcined bauxite in raw materials were replaced by the kyanite, flint clay and aciform wollastonite to solve the problem of high water absorption rate and low strength. The relationship model between preparation process conditions and secondary mullitization reaction process were established through the changes of chemical and mineral composition in production formula. The formation mechanism of low strength and high water absorption rate of large scale ceramic plates were analyzed through the performance comparison of the original ceramic plates and the new ceramic plates in which calcined bauxite in raw materials were replaced by the kyanite, flint clay and aciform wollastonite. Results show that the introduction of calcined bauxite into the ceramic plates can reduce the sintering shrinkage and cause the enhance effect of mullite phase, the incomplete secondary mullite reaction is the main cause of high water absorption rate and low strength. The temperature of secondary mullitization reaction is close to the sintering temperature of the ceramic plates after kyanite is used to replace calcined bauxite. The fracture modulus of the ceramic plates increases by 183%, the water absorption rate decreases by 562%, and the shrinkage rate of sintering line decreases by 92%. |
| Key words: secondary mullitization reaction ceramic plate water absorption |
