Development and Oxidation Behavior of Al-Cu-Fe Quasicrystalline Coating on Ti Alloy

Abstract

Abstract: An oxidation resistant Al-Cu-Fe quasicrystalline coating was fabricated on substrate of Ti alloy by low pressure plasma spraying (LPPS) method. As-sprayed Al-Cu-Fe coating has a rapidly solidified lamellar microstructure consisting of quasicrystalline phase and crystalline phase. The formation of quasicrystalline coating is related to the annealing. The results from the oxidation experiments showed that Al-Cu-Fe quasicrystalline coating improved the oxidation resistance of Ti-base alloys. During the oxidation period there is no evident spallation of the coating from the substrate. Oxide formed on the surface of Al-Cu-Fe quasicrystalline coating after oxidation consisted of Al¬2O¬3. Oxidation occurs leading to a change of concentration and phase transformation in the coating surface. Selective oxidation of Al transforms the quasicrystalline phase into the phase.

Key words: Low pressure plasma spray, Ti-base alloy, Al-Cu-Fe quasicrystal, Oxidation, Coating

Fei CAI, Chungen ZHOU, Huibin XU, Shengkai GONG. Development and Oxidation Behavior of Al-Cu-Fe Quasicrystalline Coating on Ti Alloy[J]. J Mater Sci Technol, 2004, 20(06): 713-715.

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Development and Oxidation Behavior of Al-Cu-Fe Quasicrystalline Coating on Ti Alloy

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