Fabrication of in-situ Ti(C,N) phase toughened Al2O3 based ceramics from natural bauxite

被引：15
|
作者：
Li, Ziyan [1 ]
Fu, Lvping [1 ,2 ,3 ]
Gu, Huazhi [1 ]
Or, Siu Wing [2 ]
Huang, Ao [1 ]
Lv, Renxiang [3 ]
机构：
[1] Wuhan Univ Sci & Technol, State Key Lab Refractories & Met, Wuhan 430081, Peoples R China
[2] Hong Kong Polytech Univ, Dept Elect Engn, Hung Hom, Kowloon, Hong Kong, Peoples R China
[3] Jinan Ludong Refractories Co Ltd, Jinan 250109, Peoples R China
来源：
CERAMICS INTERNATIONAL | 2021年 / 47卷 / 18期
基金：
中国博士后科学基金; 中国国家自然科学基金;
关键词：
Toughening; Bauxite; Mechanical properties; Ti(C; N); Al2O3  based ceramic; MECHANICAL-PROPERTIES; CARBOTHERMAL REDUCTION; MICROSTRUCTURE; TICN; NITRIDATION; COMPOSITE; PRESSURE; GRAPHENE; COATINGS; BEHAVIOR;
D O I：
10.1016/j.ceramint.2021.05.273
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Al2O3-Ti(C,N) ceramics were fabricated via carbothermal reduction nitridation method with high-titania specialgrade bauxite as the raw material. The formation mechanism of in-situ Ti(C,N) phase and its effect on the properties of materials are discussed. After nitrided at 1700 degrees C, Ti(C,N) phase could be formed in-situ with appropriate C/TiO2 molar ratio. Due to the residual stress field formed by Ti(C,N) particles, the path of crack propagation is changed, leading to the crack deflection and pinning. Therefore, the mechanical properties of the materials are improved by forming in-situ Ti(C,N) phase. With a C/TiO2 molar ratio of 2.2 and nitridation temperature of 1700 degrees C, Al2O3-Ti(C,N) ceramic with a hardness of 13.9 GPa, a fracture toughness of 8.28 MPa m1/2 and a flexural strength of 387 MPa could be fabricated.
引用
收藏
页码：25497 / 25504
页数：8
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