THERMAL-SHOCK RESISTANCE OF A CERAMIC COMPRISINGn60 PERCENT BORON CARBIDE AND 40 PERCENT TITANIUM DIBORIDE

摘要

An investigation was conducted to evaluate the thermal-shock resistance of a ceramic comprising 60 percent (by volume) boron carbide and 40 percent (by volume) titanium diborane. Two types of quench apparatus were employed, one for drastically quenching the periphery of small disks, the other for simulating altitude blow-out conditions in a turbojet engine.nOn the basis of these evaluations, the ceramic compared favorably with National Bureau of Standards body 4811C and with zirconia, but was inferior to beryllia, alumina, and titanium-carbide ceramals.