The ultrafine-grained β-Sialon ceramics were fabricated by spark plasma sintering at different temperatures with inorganic Al 2 O 3 -Y 2 O 3 and Ti-22Al-25Nb intermetallic powder as composite additives. The research showed that β-Sialon ceramics achieve two-stage sintering densification. Al 2 O 3 -Y 2 O 3 inorganic additives promoted the synthesis and densification of β-Sialon ceramics at 1125-1215 • C. Ti-22Al-25Nb intermetallic powder diffused Ti and Nb elements at 1240-1425 • C, thereby improving the fracture toughness of β-Sialon ceramics. The maximum fracture toughness (∼9.69 MPa m 1/2 ) under 19.6 N was obtained for β-Sialon ceramics sintered at 1600 • C.
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