Effect of Rare Earths on Mechanical Properties and Microstructure of TiCN/Al2O3 Ceramics
来源期刊：JOURNAL OF RARE EARTHS2004年增刊第3期
论文作者：Sun Xundong Li Xikun Xiu Zhimeng
Key words：rare earths; TiCN/Al2O3; mechanical property; microstructure; cracks extension; mechanics of enforcement of toughness;
Abstract: The effects of Y on mechanical properties and microstructure of TiCN/Al2O3 ceramics were studied in details. The experimental results show that the mechanical properties and microstructure can be improved by adding rare earth in TiCN/Al2 O3 ceramics, flexural strength and fracture toughness of the composites increased when Y is doped by 18.99% and 18.58% than those of the matrix, respectively. Microstructure of cracks extension was observed through SEM and TEM. The mechanics of particles bridge, cracks branch and cracks deflection are enforced obviously during the processes of cracks extension because strong interfaces and weak interfaces coexist, so manifold mechanics of enforcement of toughness act upon together to increase fracture toughness of TiCN/Al2 O3 doped with Y.
Sun Xundong1，Li Xikun2，Xiu Zhimeng1
(1.School of Materials and Metallurgy, Northeastern University, Shenyang 110004,China;
2.School of Materials, Shenyang University of Science and Technology, Shenyang 110168, China)
Abstract:The effects of Y on mechanical properties and microstructure of TiCN/Al2O3 ceramics were studied in details. The experimental results show that the mechanical properties and microstructure can be improved by adding rare earth in TiCN/Al2 O3 ceramics, flexural strength and fracture toughness of the composites increased when Y is doped by 18.99% and 18.58% than those of the matrix, respectively. Microstructure of cracks extension was observed through SEM and TEM. The mechanics of particles bridge, cracks branch and cracks deflection are enforced obviously during the processes of cracks extension because strong interfaces and weak interfaces coexist, so manifold mechanics of enforcement of toughness act upon together to increase fracture toughness of TiCN/Al2 O3 doped with Y.
Key words:rare earths; TiCN/Al2O3; mechanical property; microstructure; cracks extension; mechanics of enforcement of toughness;
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