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Properties of Liquid Phase Sintered SiC Materials Containing $Al_2O_3$ and $Y_2O_3$ Particles  

Lee, Sang-Pill (Department of Mechanical Engineering, Dong-Eui University)
Lee, Moon-Hee (Department of Mechanical Engineering, Dong-Eui University)
Lee, Jin-Kyung (Department of Mechanical Engineering, Dong-Eui University)
Publication Information
Journal of Ocean Engineering and Technology / v.22, no.4, 2008 , pp. 59-64 More about this Journal
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.
Keywords
Liquid phase sintering; Particle size; Test temperature; Mechanical property; Microstructure;
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Times Cited By KSCI : 2  (Citation Analysis)
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