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Oxidation resistance of sintered TiB2-xB4C compo sites (x=0.3, 0.5, 0.7, 1.0) prepared by high pressure sintering was examined in air for 1-50h from room tem perature to 1400•Ž. The sintered composites exhibited comparatively high oxidation resistance in air up to 600•Ž with formation of traces of TiO2 and B2O3. A pro tective film composed of solid TiO2 and liquid B2O3 was formed in the temperature range of 700 to 800•Ž and prevented further oxidation of the bulk composites. In the temperature range of 800 to 1000•Ž, the oxide layer thickness increased with increasing oxidation time and TiB2 content in the composites. Rapid oxidation of the sintered composites occurred at temperatures above 1000•Ž.

Oxidation Resistance of Sintered TiB<sub>2</sub>-B<sub>4</sub>C Composites