The mechanical property of sintered MoSi2 materials has been investigated, based on the detailed examination of their microstructures. The nondestructive technique by an ultrasonic wave was also used for evaluating the damage behaviors of MoSi2 materials suffered from the cyclic thermal shock. MoSi2 materials were sintered at the temperature of 1723 K. The flexural strength of MoSi2 materials gradually decreased with increasing the thermal shock cycle, accompanying the extensive creation of surface cracks. The increase of thermal shock cycles resulted in a great decrease of ultrasonic wave velocity and a linear increase of attenuation coefficient for MoSi2 materials.
This paper dealt with the fabricating process of liquid phase sintered (LPS) SiC ceramics
containing the oxide additives of Al2O3 and Y2O3, in conjunction with the evaluation of their
mechanical properties. LPS-SiC ceramics was sintered at the temperature of 1820 oC under an
applied pressure of 20 MPa and a pressure holding time of 2 hour. A commercial SiC powder with
an average size of about 0.3 μm was used as a starting powder. LPS-SiC ceramics with additive
composition ratios of 1.5 and 2.3 (Al2O3/Y2O3) represented an excellent density of about 3.2 Mg/m3.
LPS-SiC ceramics had a flexural strength of about 800 MPa and a fracture toughness of about 8.0
MPa⋅m0.5 at an additive composition ratio (Al2O3/Y2O3) of 1.5.
The microstructure and the mechanical property of liquid phase sintered (LPS) SiC
materials with oxide secondary phases have been investigated. The strength variation of LPS-SiC
materials exposed at the elevated temperatures has been also examined. LPS-SiC materials were
sintered at the different temperatures using two types of Al2O3/Y2O3 compositional ratio. The
characterization of LPS-SiC materials was investigated by means of SEM with EDS, three point
bending test and indentation test. The LPS-SiC material with a density of about 3.2 Mg/m3
represented a flexural strength of about 800 MPa and a fracture toughness of about 9.0 MPa⋅√m.
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