COMPOSITE CERAMIC MATERIAL AND METHOD FOR PRODUCTION THEREOF Russian patent published in 2015 - IPC C04B35/117 C04B35/626 B82Y40/00 

FIELD: chemistry.

SUBSTANCE: composite ceramic material based on synthesized nanopowders contains corundum, tetragonal zirconium dioxide and calcium-cerium hexaaluminate [CeCa]Al₁₂O₁₉, with the following ratio of components, vol %: 63-66 - Al₂O₁₃ (corundum), 6-8 - [CeCa]Al₁₂O₁₉ (calcium-cerium hexaaluminate), the balance - tetragonal ZrO₂ (Ce-TZP). The method of producing the material includes simultaneous reverse deposition, from a mixture of 1M solutions of zirconium oxychloride, cerium, aluminium and calcium nitrates with ammonia solution in the presence of isobutanol, of nanopowder precursors having the chemical composition (mol %) Al₂O₃ 61-65%, ZrO₂ 28-34%, CeO₂ - 4-5%; CaO 1-2%, heat treatment at 1050-1100°C, deagglomeration, compacting samples and sintering at final temperature of 1600-1630°C, during which a dispersion-strengthening phase of calcium-cerium hexaaluminate ([CeCa]Al₁₂O₁₉) is formed in situ in the form of long prismatic grains. The material has the following properties: density 4.58-4.62 g/cm³, cross-breaking strength σ=900-1000 MPa, crack resistance k1s=10.5-11.5 MPa·m^1/2, microhardness H=12-12.5 GPa and modulus of elasticity E=322-324 GPa.

EFFECT: producing a composite ceramic material with high resistance to brittle fracture.

2 cl, 2 tbl, 3 ex, 4 dwg