欠陥抵抗性が高い二重表面層をもつセラミックス複合材料(オーガナイズドセッション,超塑性と材料および造形法)

概要

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The 5-layer composite, Al_2O_3 (300 or 500μm)/NiAl-Al_2O_3(200μm)/Al_2O_3(2.5mm)/NiAl-Al_2O_3(200μm)/Al_2O_3(300 or 500μm), has been fabricated by a powder stacking method. The strength and fracture toughness are 654MPa and 5-7MPa・m^<1/2>, respectively, which are quite higher than 623MPa and 3.43・m^<1/2> for a monolithic alumina. The surface alumina layer has the microstructure adequate to the high wear-resistance. Then, the higher defect-tolerancy can be realized without degrading the excellent corrosion- and wear-resistance of ceramic materials. Additionally, a possibility of improving the reliability by the oxidation of NiAl forming NiAl_2O_4 providing compressive stress is suggested.
一般社団法人日本機械学会の論文
2004-09-23