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无机材料学报

无机材料学报

• 研究论文 • 上一篇    下一篇

含碳添加剂Al2O3基陶瓷复合材料的增韧机理

许崇海1; 黄传真2; 李兆前3; 艾兴2   

  1. 1. 山东轻工业学院机电工程系, 济南 250100; 2. 山东大学机械工程学院, 济南 250061; 3. 山东省经济贸易委员会, 济南 250011
  • 收稿日期:2000-03-24 修回日期:2000-05-26 出版日期:2001-03-20 网络出版日期:2001-03-20

Toughening Mechanisms of Al2O3/TiC Ceramic Composite with Carbon Additive

XU Chong-Hai1; HUANG Chuan-Zhen2; LI Zhao-Qian3; Al Xing2   

  1. 1. Shandong Institute of Light Industry; Jinan 250100; China; 2. Shandong University; Jinan 250061, China; 3. Shandong Economy and trade Committee; Jinan 250011; China
  • Received:2000-03-24 Revised:2000-05-26 Published:2001-03-20 Online:2001-03-20

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摘要： 以碳为添加剂，利用热压工艺制得的 Ａ１２Ｏ３／ＴｉＣ新型陶瓷复合材料，其断裂韧性比相应不合碳的Ａｌ２Ｏ３／ＴｉＣ陶瓷材料提高约２０％.理论与实验分析表明：弱界面是获得高韧性陶瓷复合材料的一个有效途径．以石墨形态存在的碳在材料中不但能导致自发微裂纹的产生，而且还能形成弱界面，并在强弱界面的共同作用下以裂纹桥联、裂纹分支与裂纹偏转等多种增韧机制及其协同作用共同提高Ａ１２Ｏ３／ＴｉＣ陶瓷材料的断裂韧性．

关键词: 陶瓷材料, 氧化铝, 碳, 添加剂, 增韧机理

Abstract: With carbon as an additive, the fracture toughness of Al2O3/TiC ceramic material fabricated by hot pressing technology is increased by 20% than that of
Al2O3/TiC composite without any carbon added. The results of theoretical and experimental analyses show that the existing of weak interfaces in the ceramic
material is one of the effective approaches to achieve higher fracture toughness. The added carbon, existing as a form of graphite, can result in not only the
formation of spontaneous microcracks but also the formation of weak interfaces. As a result of the comprehensive integration and synergism of varieties of single
toughening mechanisms such as crack bridging, crack branching and crack defection etc., the fracture toughness of Al2O3/TiC ceramic material can be enhanced obviously.

Key words: ceramic material, alumina, carbon, additive, toughening mechanism

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