| 摘要: |
| 以小长径比Al2O3短纤维为增强体制备增强薄型瓷质陶瓷，研究Al2O3短纤维掺量对其吸水率、素坯和成品弯曲强度、断裂功、物相和显微结构的影响，并对其增强增韧机理进行了分析.结果表明：在增强薄型瓷质陶瓷配合料中，Al2O3短纤维的最佳掺量（质量分数）为15%，其素坯的弯曲强度比基质陶瓷素坯高62%，达到176MPa，烧成后其吸水率（质量分数）为045%，弯曲强度比基质陶瓷高1690%，达到8184MPa，断裂功比基质陶瓷增加358%，达到67022J/m2.在1200℃的烧成过程中，Al2O3短纤维的主晶相由θ Al2O3转变为α Al2O3，促进了基体中二次莫来石的析出，从而使弯曲强度提高.断裂功的增加源于裂纹在Al2O3短纤维与基体界面发生偏转和界面脱黏，也得益于二次莫来石和Al2O3短纤维中大量纳米晶界对裂纹扩展能量的吸收. |
| 关键词: 薄型瓷质陶瓷 Al2O3短纤维 增强 断裂功 |
| DOI：103969/j.issn.1007 9629201801029 |
| 分类号: |
| 基金项目:蒙娜丽莎集团股份有限公司博士后科研工作站资助项目 |
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| Experimental Study of Thin Porcelain Tile Reinforced by Al2O3 Short Fiber |
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ZHANG Dian1, LIU Yijun1, TONG Jifeng2, XUE Qunhu3
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1.Postdoctoral Research Center at Monalisa Group Co., Ltd., Foshan 528211, China;2.Research Institute of Ceramics Science, China Building Materials Academy, Beijing 100024, China;3.College of Materials and Mineral Resources, Xian University of Architecture and Technology, Xian 710055, China
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| Abstract: |
| Thin porcelain was reinforced by using Al2O3 short fibers with low aspect ratio as reinforcement. The influence of addition of Al2O3 short fibers on water absorption, bending strength of green body and sintered body, fracture work, phases and morphologies of the specimens as well as mechanism of reinforcement and toughening were studied. The results show that the optimal Al2O3 short fibers content in the raw powder mixture of porcelain is 15%(by mass), at which the water absorption of sintered body is 045%(by mass) and the bending strength of green body and sintered body is 176MPa and 8184MPa which is 62% and 1690% higher than that of porcelain matrix respectively. Especially, the fracture work of sintered body rises to 67022J/m2, which is 358% higher than that of porcelain matrix. The major phase of fiber turns from θ Al2O3 to α Al2O3 which promotes secondary mullite during sintering at 1200℃, leading to reinforcement effect. The fracture work increases significantly due to crack deflection and debonding of interface between fiber and matrix. Meanwhile, the secondary mullite and large amount of nano grain boundaries in Al2O3 short fibers also attribute to energy consumption for crack propagation. |
| Key words: thin porcelain tile Al2O3 short fiber reinforcement fracture work |
