THERMAL SHOCK RESISTANCE OF ZIRCONIA /IRON-ALUMINIDE COMPOSITES EVALUATED BY INDENTATION-QUENCH TECHNIQUES
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摘要: 采用压痕-淬冷技术研究了单相 ZrO2(3Y)及ZrO2(3Y)/Fe3Al复合材料的抗热震性能。研究表明: 单相ZrO2(3Y)及ZrO2(3Y)/Fe3Al复合材料的压痕裂纹在热震作用下具有相似的扩展模式: 当△T<△TU时, 裂纹扩展量较低, 且进行稳态扩展; 当△T>△T</em>U时, 裂纹发生失稳扩展。 复合材料的△TU明显高于单相ZrO2(3Y)。ZrO2(3Y)/Fe3Al复合材料较高的断裂韧性和导热率、 较低的弹性模量和泊松比是导致△TU升高的主要原因。Abstract: The thermal shock resistance of ZrO2(3Y) and ZrO2(3Y)/Fe3Al composite was studied using indentation-quench technique. The results show that the pattern of crack growth is similar for the two materials. Low crack growth in a stable manner happened when ΔT<ΔTU, and cracks grew unstably when ΔT>ΔTU. The ΔTU of ZrO2(3Y)/Fe3Al composite is higher than that of ZrO2(3Y), indicating the improved thermal shock resistance. The higher fracture toughness and thermal conductivity and lower elastic modulus and Poisson's ratio of ZrO2(3Y)/Fe3Al composite compared with monolith ZrO2 are the main reasons for the elevated ΔTU value of ZrO2(3Y)/Fe3Al composites.
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Key words:
- indentation /
- thermal shock resistance /
- composites
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