Densification behavior, microstructural evolution, and mechanical properties of hot-pressed specimens using

-SiC and

-SiC powder with Al2O3 additive were studied. Beta-SiC powder was fully densified as 205

, but

-SiC powder was at 210

. The maximum flexural strength and the fracture toughness of the specimen hot-pressed using

-SiC powder were 681 MPa and 6.7 MPa{{{{ SQRT {m } }}, and thosevalues of specimen hot-pressed using

-SiC powder were 452 MPa and 4.7 MPa{{{{ SQRT {m } }}, respectively. The strength superiority of specimen hot-pressed using

-SiC powder was due to the finer grain size, and higher density. The higher toughness of specimen hot-pressed using

-SiC powder than

-SiC powder than

-SiC powder was due to the crack deflection mechanism arised from the difference of thermal expansion coefficient between

and

-SiC phases which were co-existed in the sintered body.