Oxidation behaviour of HfB2-15vol% TaSi2 at low, intermediate and high temperatures

The thermal stability of a HfB 2-15 vol.% TaSi2 composite was tested by thermogravimetric analysis from 25 to 1500°C, in a bottom-up furnace at 1600°C for 15 min and in an arc-jet facility at temperatures between 2000 and 2500°C. The layered scales resulting from arc-jet and conventional furnace oxidation are very similar. The flexural strength does not change after oxidation at 1600°C. The effect of TaSi2 on the oxidation resistance is investigated