Effect of Rare Earths on Mechanical Properties and Microstructures of Si3N4-based Ceramics
来源期刊：JOURNAL OF RARE EARTHS2000年第1期
论文作者：YOU Xiang-qun LIU Da-wei LIU Bing-yu MU Bai-chun GU Zhi-gang LI Ming
Key words：rare earths; Si3N4; mechanical property; microstructure;
Abstract: The effects of Y2O3, La2O3 and Nd2O3 on the mechanical properties and microstructures of Si3N4-based ceramics were studied. It shows that a significant improvement in mechanical properties can be obtained by adding rare earths oxides in Si3N4. The fracture toughness and the flexural strength of Si3N4 added with both Y2O3 and La2O3 are 7.8 MPa.m1/2 and 962 MPa, respectively. The main reason is that adding rare earths in Si3N4 can improve the microstructure of the material and increase the aspect ratio of β-Si3N4 grain.
YOU Xiang-qun1，LIU Da-wei2，LIU Bing-yu1，MU Bai-chun1，GU Zhi-gang1，LI Ming3
(1.Department of Material Engineering, Liaoning Institute of Technology, Jinzhou 121000, China;
2.Jinzhou Products Quality Testing Institute, Jinzhou 121000, China;
3.Television University of Jinzhou Railway Bureau, Jinzhou 121000, China)
Abstract:The effects of Y2O3, La2O3 and Nd2O3 on the mechanical properties and microstructures of Si3N4-based ceramics were studied. It shows that a significant improvement in mechanical properties can be obtained by adding rare earths oxides in Si3N4. The fracture toughness and the flexural strength of Si3N4 added with both Y2O3 and La2O3 are 7.8 MPa.m1/2 and 962 MPa, respectively. The main reason is that adding rare earths in Si3N4 can improve the microstructure of the material and increase the aspect ratio of β-Si3N4 grain.
Key words:rare earths; Si3N4; mechanical property; microstructure;
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