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Improving oxidation resistance of MoSi 2 coating by reinforced with Al 2 O 3 whiskers
Intermetallics ( IF 4.4 ) Pub Date : 2018-03-01 , DOI: 10.1016/j.intermet.2017.12.023
Lu Wang , Qiangang Fu , Fengling Zhao

Abstract To improve the toughness and oxidation resistance of MoSi2 coating, Al2O3 whiskers and Al2O3 particles were introduced respectively. The geometry of Al2O3 significantly influence the toughening effect on suppressing crack extension. After oxidation at 1450 °C for 76 h, MoSi2 coating reinforced with 1% Al2O3 whiskers lost mass of only 0.17% and remained integrity, compared to the particles with 0.70% and destroyed by penetrative cracks, exhibiting favorable oxidation resistance. The improved property resulted from the crack-healing by Al2O3·21SiO2 glass occurred during oxidation and better toughening effect by the whiskers to restrain crack growth. Noticeable, increased Al2O3 content made the coatings porous remarkably, and also decrease the crack resistance during oxidation, led to degradation of the ability to resist accelerated oxidation erosion.

中文翻译:

通过Al 2 O 3 晶须增强提高MoSi 2 涂层的抗氧化性

摘要 为了提高MoSi2涂层的韧性和抗氧化性,分别引入了Al2O3晶须和Al2O3颗粒。Al2O3 的几何形状对抑制裂纹扩展的增韧效果有显着影响。在 1450 °C 氧化 76 h 后,用 1% Al2O3 晶须增强的 MoSi2 涂层仅损失 0.17% 的质量并保持完整性,与 0.70% 的颗粒相比并被穿透裂纹破坏,表现出良好的抗氧化性。Al2O3·21SiO2玻璃在氧化过程中发生裂纹愈合,晶须具有更好的增韧效果,抑制裂纹扩展,从而提高了性能。值得注意的是,Al2O3 含量的增加使涂层显着多孔,同时也降低了氧化过程中的抗裂性,
更新日期:2018-03-01
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