Al2O3와 Y2O3 입자를 함유한 액상소결 SiC 재료의 특성
Properties of Liquid Phase Sintered SiC Materials Containing Al2O3 and Y2O3 Particles
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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℃ 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 Al2O3-Y2O3 mixture with a constant composition ratio (Al2O3/Y2O3: 1.5). The particle sizes of the commercial SiC powderswere 30 nm, 0.3 μm, and 3.0 μm. 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 Y3Al2(AlO4)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.
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℃ 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 Al2O3-Y2O3 mixture with a constant composition ratio (Al2O3/Y2O3: 1.5). The particle sizes of the commercial SiC powderswere 30 nm, 0.3 μm, and 3.0 μm. 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 Y3Al2(AlO4)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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