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Internal Oxidation of Some Pd-40Ag-1RE Alloys

Rare Metals 1990年第1期10卷 30-33页

作者： Ning, Yuantao Li, Yongnian Dai, Hong Inst of Precious Metals China

The internal oxidation behavior of Pd-40Ag-1RE (RE = Sm, Eu, Gd, Y) alloy wires has been studied in air at 800 °C 1200°C. The dependence of internal oxidation depth ξ on reaction time t can be expressed as ξ = Ktn, the reaction index n = 0.50 approximately 0.75. The higher the oxidation temperature is, the larger the n value is. It means that the internal oxidation of wire sampls at high temperature deviates from parabola rule observed on plate sample. The activation energies of the studied alloys range over 120 approximately 160 kJ/mol. The internal oxidation process is controlled by the bulk diffusion of oxygen.

关键词： Metallography Phase Transitions Oxygen Diffusion Palladium and Alloys high temperature effects Rare Earth Elements Internal Oxidation

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DOUBLE GLOW PLASMA SURFACE ALLOYING OF Ti6A14V AND TiAl

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Acta Metallurgica Sinica(English Letters) 2002年第2期15卷 172-176页

作者： Z.Xu, L. Qin, B. Tang and Z. Y. He Research Institute of Surface Engineering, Taiyuan University of Technology, Taiyuan 030024, China X.S. Xie and C.L. Zheng School of Materials Science and Engineering, University of Science and Technology Beijing, Beiji

In order to improve the wear resistance of titanium alloy Ti6Al4V and high temperature oxidation resistance of intermetallic compound TiAl, the Double Glow Plasma Surface Alloying Technique (DG technique) was applied to modify the surface properties of these materials. Mo, Nb, Cr, Ni were diffused into the substrate materials to form alloyed layers with different properties. This paper shows the microstructure, microhardnesses, distributions of the alloy elements on the alloyed layers. Wear and high temperature oxidation tests were carried out. Test results indicate that the wear resistance of Ti6Al4V and the high temperature oxidation resistance of TiAl were improved significantly.

关键词： high temperature effects Oxidation resistance Surface treatment Titanium alloys Wear resistance

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high temperature Oxidation Behavior of NiCrAlY Coating by Arc Ion Plating

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Chinese Journal of Aeronautics 2001年第2期14卷 106-111页

作者：王冰汪爱英孙超黄荣芳闻立时 Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China

A NiCrAlY coating was prepared on the cast Ni-base superalloy K17 using arc ion plating. The coating was uniform, dense and well adhesive to the substrate. The oxidation kinetic curves of the alloy K17 and the coating were obtained. The results indicated that the oxidation resistance of the alloy K17 was evidently improved with NiCrAlY coatings at 900∼1100°C. As oxidation temperature rising, the interdiffusion between the coatings and substrates was enhanced. Ti atoms diffused from the substrate to the surface of coating to form the oxide, which was one of the reasons for the decrement of oxidation resistance. The oxidation resistance of NiCrAlY coating was decreased due to the spalling of pieces of oxide.

关键词： high temperature effects Interdiffusion (solids) Nickel alloys Oxidation Plating Substrates Titanium

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