采用热压烧结制备了Fe3Al(p)／Al2O3复合材料,通过分析R曲线与热应力强度因 子K曲线的相关性,对Fe3Al(p)／Al2O3复合材料抗热震性能进行分析预测.结果表明,理论 预测与采用淬冷强度法得到的实验结果吻合较好,Fe3Al的加入使复合材料的抗热震性能明 显改善, △Tc由单相的200℃提高至复合材料的400℃,复合材料较单相Al2O3高的断裂韧 性、导热率、及低的弹性模量和f(β)是导致其抗热震性能提高的主要原因.
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.
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