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J. Ocean Eng. Technol. 2008;22(4):59-64.    

Properties of Liquid Phase Sintered SiC Materials Containing $Al_2O_3$ and $Y_2O_3$ Particles
Lee Sang-Pill,Lee Moon-Hee,Lee Jin-Kyung
Department of Mechanical Engineering Dong-Eui University,Department of Mechanical Engineering Dong-Eui University,Department of Mechanical Engineering Dong-Eui University
$Al_2O_3$$Y_2O_3$ 입자를 함유한 액상소결 SiC 재료의 특성
이상필,이문희,이진경
동의대학교 기계공학과,동의대학교 기계공학과,동의대학교 기계공학과
© 2008 The Korean Society of Ocean Engineers     Open access / Under a Creative Commons License
Keywords: Liquid phase sintering, Particle size, Test temperature, Mechanical property, Microstructure
핵심용어: SiC 탄화규소, 액상소결, 입자크기, 시험온도, 기계적 특성, 미세구조
Abstract
The mechanical properties of liquid phase sintered (LPS) SiC materials, with the addition of oxide powder, were investigated, in conjunction with a detailed analysis of their microstructures. LPS-SiC materials were fabricated at a temperature of 1820 $^{circ}C$ under an argon atmosphere, using three different starting sizes of SiC particles. The sintering additive for the fabrication of the LPS-SiC materials was an $Al_2O_3-Y_2O_3$ mixture with a constant composition ratio ($Al_2O_3/Y_2O_3$: 1.5). The particle sizes of the commercial SiC powderswere 30 nm, 0.3 $mu$m, and 3.0 $mu$m. The flexural strength of the LPS-SiC materials was also examined at elevated temperatures. A decrease in the starting size of the SiC particles led to an increase in the flexural strength of the LPS-SiC materials, accompanying a highly dense morphology with the creation of a secondary phase. Such a secondary phase was identified as $Y_3Al_2(AlO_4)2$. The flexural strength of the LPS-SiC materials greatly decreased with an increase in the test temperature, due to the creation of a large amount of pores.


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