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Preparation and High Temperature Oxidation Properties of Micro-crystalline MGH754 ods Alloy coatings

Journal of University of Science and Technology Beijing 2001年第1期8卷 28-34页

作者： Huibub Qi Hongmei Pang Yedong He Deren Wang Wei Gao Material Seience and Engineering School, University of Science and Technology Beijing, Beijing 100083, China Department of Chemical and Material Engineeing, the University of Auckland, New Zealand Material Science/Engineering School Univ. of Science/Technology Beijing Beijing 100083 China

A special coating technique, electro-spark deposition (ESD), was developed to produce micro-crystalline ods MGH754 alloy coatings on a commercial 1Cr18Ni9Ti stainless steel and a cast Ni20Cr alloy substrates. The coatings have a very fine grain structure and metallurgical bonding with the substrates. The isothermal oxidation tests at 1000 degreesC in air showed that the micro-crystalline ods alloy coatings had a much reduced oxidation rate and improved scale spallation resistance compared with the uncoated alloys. The selective oxidation of Cr was greatly promoted to form protective and continuous Cr2O3 scales on the alloy surface. Micro-crystallization and oxide dispersions have synergistic effects on the improvement of oxidation resistance. The beneficial effects were discussed based on the experimental results.

关键词： electro-spark deposition (ESD) ods coating oxidation

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OXIDATION RESISTANCE OF NANOCRYSTAL ods ALUMINIDE coatingS PRODUCED BY PACK ALUMINIZING PROCESS ASSISTED BY BALL PEENING

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Acta Metallurgica Sinica(English Letters) 2006年第3期19卷 215-222页

作者： Z.L. Zhan Y.D. He W. Gao Kunming University of Science and Technology Kunming 650093 China Beijing Key Laboratory for Corrosion Erosion and Surface Technology University of Science and Technology Beijing Beijing 100083 China Engineering School The University of Auckland Auckland 1020 New Zealand

Nanocrystal ods （oxide dispersion strengthening） aluminide coatings were produced on a stainless steel and nickel-based superalloy by the pock aluminizing process assisted by ball peening, Pure Al powders and 1% of ultra-fine Y2O3 powders were mixed by ball milling. The ultra-fine Y2O3 powders were dispersed in Al particles. Ball peening welded the Al particles onto the substrate and accelerated the formation of aluminide coating. Nanocrystal ods aluminide coatings were produced by the outward growth at a much low temperature （below 600℃） in a short treatment time. The effects of the operation temperature and treatment time on the formation of the coatings were analyzed. SEM （scanning electron microscope）, AFM （atomic force microscope）, EDS （energy dispersive X-ray spectroscopy）, XRF （X-ray fluorescence spectrometer） and XRD （X-ray diffraction） methods were applied to investigate the microstructure of the coatings. High-temperature oxidation tests were carried out to evaluate the oxidation resistance of the ods aluminide coatings.

关键词： nano-coating ods coating aluminide coating ball peening high-temperature oxidation

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