Ceramic composite in Al₂O₃-B₄C-TiC system

Ceramic composites of high mechanical properties were obtained on the basis of aluminum oxide, boron carbide and titanium carbide, in the presence of small admixes of MgO, Y₂O₃ - and C-fiber. Composite was obtained under hot compression at the 16000 ℃ temperature at 30 mPa. X-ray diffraction and electron microscopic analyses proved the assumption that titanium carbide at the interaction with boron carbide contributes to the formation of titanium diboride and the final composite consists of the corundum, titanium diboride and residual boron carbide phases. Mechanical characteristics of the composite are as follows: limit of hardness at compaction and at bending, correspondingly 1900 MPa and 390 MPa; HRA - 93; impact strength - 30 kJ/m² at the specific density 0,96. (author)