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Microstructure and high temperature oxidation resistance of Si-Y co-deposition coatings prepared on TiAl alloy by pack cementation process

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Transactions of Nonferrous Metals Society of China 2015年第3期25卷 803-810页

作者：李涌泉谢发勤吴向清北方民族大学材料科学与工程学院银川750021 西北工业大学航空学院西安710072

In order to improve the high temperature oxidation resistance of TiAl alloy, Y modified silicide coatings were prepared by pack cementation process at 1030, 1080 and 1130 °C, respectively, for 5 h. The microstructures, phase constitutions and oxidation behavior of these coatings were studied. The results show that the coating prepared by co-depositing Si?Y at 1080 °C for 5 h has a multiple layer structure: a superficial zone consisting of Al-rich (Ti,Nb)5Si4 and (Ti,Nb)5Si3, an out layer consisting of (Ti,Nb)Si2, a middle layer consisting of (Ti,Nb)5Si4 and (Ti,Nb)5Si3, and aγ-TiAl inner layer. Co-deposition temperature imposes strong influences on the coating structure. The coating prepared by Si?Y co-depositing at 1080 °C for 5 h shows relatively good oxidation resistance at 1000 °C in air, and the oxidation rate constant of the coating is about two orders of magnitude lower than that of the bare TiAl alloy.

关键词： TiAl alloy Si-Y co-deposition coating microstructure high temperature oxidation resistance pack cementation process

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Surface modification of Ti-45Al-8.5 Nb alloys by microarc oxidation to improve high-temperature oxidation resistance

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Progress in Natural Science:Materials International 2018年第3期28卷 386-390页

作者： Fang Cheng Shasha Li Wanyuan Gui Junpin Lin State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing

Microarc oxidation（MAO）electrolysis plasma deposition was used to prepare Al2O3coatings on Ti-45Al-8.5 Nb alloys to improve high temperature oxidation *** surface and cross-section morphologies before and after high-temperature oxidation,the chemical composition,and the phase identification of the coatings were investigated by scanning electron microscopy（SEM）,electron probe microanalyses（EPMA）,and X-ray diffraction（XRD）.The results show that Al2O3coatings with a thickness of approximately 8μm can be obtained on the Ti-45Al-8.5 Nb alloys by MAO for 600 *** samples with the Al2O3coatings exhibited better high-temperature oxidation resistance.A minimal weight gain of only 0.396 g/m2after 100 h oxidation at 900°C was observed for the coatings formed with a deposition voltage of 400 V and using a duty cycle of 3%.The deposition mechanism of the Al2O3coatings and the effect of the MAO parameters are also described.

关键词： Cathode electrolytic plasma Microarc oxidation high temperature oxidation resistance high Nb-Ti Al alloys Coating

Microstructure and corrosion resistance of sputtered TiN coatings on surface of Zr-4 alloy

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Journal of Chongqing University 2018年第1期17卷 17-26页

作者： LIAO Bang-liang MA Jian-guang ZHU Wei-hua ZHU Hong-mei YANG Kai LIU Yan-hong LI Huai-lin WANG Xiao-jing WANG Xin-lin school of mechanical engineering university of south chinaHengyang 421001P.R China school of electrical engineering university of south chinaHengyang 421001P.R China state power investment corporation science and technology research institute Beijing 102209PR.China

To improve the oxidation resistance and corrosion resistance of Zr-4 alloy, titanium nitride （TIN） coatings were prepared on the Zr-4 alloy with a TiN ceramic target with different ratios of N2. Microstructure and high-temperature properties of the TiN coated samples were studied by scanning electron microscopy （SEM）, energy dispersive spectrometer （EDS）, X-ray diffraction meter （XRD）, X-ray photoelectron spectroscopy （XPS）, heat treatment furnace and autoclaves, respectively. The x value of the TiN coatings （TiN） ranges from 0.96 to 1.33. After the introduction of N2, TiN coating exhibits a weak （200） plane and a preferred （111） orientation. The coating prepared with an N2 flow ratio of 15% shows an optimal oxidation resistance in the atmospheric environment at 800 ℃. In either 1 200 ℃ steam environment for one hour, or deionized water at 360 ℃ and a pressure of 18.6 Mpa for 16 d, the opitimized TiN coated samples have no delamination or spallation; and the gains in the masses of samples are much smaller than Zr-4 alloy. These results demonstrate the effectiveness of the optimized TiN coating as the protective coating on the Zr-4 alloy under extreme conditons.

关键词： Zr-4 alloy magnetron sputtering TiN coating high temperature oxidation resistance corrosion resistance

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Al-Si-Mg-Cu Heat Storage Alloys and Their Heat Storage Properties

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Al-Si-Mg-Cu Heat Storage Alloys and Their Heat Storage Prope...