CERAMIC COMPOSITE MATERIAL Russian patent published in 2021 - IPC C04B35/488 

FIELD: composite material.

SUBSTANCE: invention relates to the production of a composite material with a matrix of zirconium dioxide stabilized in a tetragonal form and aluminum oxide. The material can be used for the manufacture of technical and medical products, in particular, as the basis of cutting tools for high-speed machining of various types of steel, cast iron, non-ferrous metals. Ceramic composite material on the basis of the charge, having a chemical composition (wt. %): 67,0≤ZrO₂≤81,0; 6,3≤Yb₂O₃≤8.3; 10≤Al₂O₃≤25; 0.7≤SrO≤1.7, contains tetragonal zirconium dioxide stabilized by ytterbium (Yb)-TZP cations, aluminum oxide (corundum) and the compound SrAl₁₂O₁₉ (strontium hexaaluminate), with the following phase ratio (vol.%): 78÷87 (Yb)-TZP, 3÷7 SrAl₁₂O₁₉, the rest is corundum. The ceramic composite material has a fine-grained microstructure, in which the long-prismatic grains of the SrAl₁₂O₁₉ phase reach sizes of 250×1500 nm, static bending strength up to 900 MPa, crack resistance K_1c up to 11 MPa·m^1/2, micro-hardness HV of 13.0-13.5 GPa.

EFFECT: creation of a ceramic composite material with a matrix of zirconium dioxide, which has a microstructure with grain sizes not exceeding 1500 nm, with high parameters of crack resistance, bending strength and increased micro-hardness.

1 cl, 1 tbl, 3 ex, 5 dwg