The title ceramics are prepared by milling tin-al2o3-aln mixtures in kerosine for 30 min, separating, washing, drying, and screening the mixture, preparing preforms by isostatic pressing at 40,000 psi using a latex sheath, and firing the preforms in nitrogen at 1,850 deg c for 2 h. The resulting composite material consists of ti-rich tialon particles dispersed in a spinel matrix and may replace chromium and cobalt high-strength alloys. A 40-30-30 (wt) tin-al2o3- aln composite ceramic had a vickers hardness (dph) 1,005, modulus of rupture 229 mpa, and fracture toughness 1.63 Mpa.M0.5, Versus 741, 130, and 0.61 For reaction-sintered si3n4.
Chem. Abstr. 112:163,891M, Aug. 27, 1991 U.S. Pat. 5,043,119