Thermal Shock Resistance of Fe_3Al(p)/Al_2O_3 Composite

Fe3Al(p)l/Al2O3 composites were prepared by hot-press sintering. The thermal shock resistance of the composite was predicted by analyzing the relation between the R-curve and thermal stress intensity factor curve. The results show that the predicting values consist well with the experimentally measured values obtained by the quench- strength method. The thermal shock resistance of the composite is improved by adding Fe3Al particles, the △Tc increasing from 200℃(Al203) to 400℃(composite). The higher fracture toughness, higher thermal conductivity and lower Young's module and f(β) are the main reasons for the improvement of thermal shock resistance.