The influence of pyrolysis temperature on Young׳s modulus of carbon-bonded alumina at temperatures up to 1450 °C

A carbon-bonded alumina containing 30 wt% of carbon was heat treated with three different pyrolysis temperatures (700 °C, 1000 °C, and 1400 °C), to evaluate the influence of this pre-treatment on the high temperature Young׳s modulus (E). It was found that E directly correlated with the pyrolysis temperature (TP). The higher the TP the bigger was the difference between the initial and the residual E. The higher the pyrolysis temperature was, the lower was the hysteresis of E(T). Furthermore, a significant increase of E(T) up to the former pyrolysis temperature was found. However, the maximum Young׳s modulus and residual Young׳s modulus were not dependent on the pyrolysis temperature. The results were in accordance with earlier investigations regarding carbon-bonded magnesia. Therefore, a general model proposed earlier could be applied to explain the microstructure of carbon-bonded oxides.