The Role of Molybdenum in the Oxidation of TiC–Ni–Mo Alloys

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  • The Role of Molybdenum in the Oxidation of TiC–Ni–Mo Alloys

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To investigate the oxidation behavior of TiC-base alloys containing molybdenum, TiC-10% Ni and TiC-10% Ni-(2.5∼18.57)% Mo alloys were prepared by sintering. These alloys were exposed in still air at 600°∼1300°C. The oxidation process and the effect of molybdenum on oxidation were studied by the weight gain, surface recession, X-ray diffraction and microstructure observations of scales. The following results were obtained.<BR>(1) Addition of molybdenum to TiC-10% Ni alloy increased the weight gain due to oxidation below 1100°C, which was most effective at 700°∼800°C. This effect was, however, decreased at higher temperatures and at 1300°C molybdenum increased the oxidation resistance reversely.<BR>(2) From the X-ray diffraction data, it appeared that at higher temperatures the oxidation of molybdenum was suppressed to cause the appearance of metallic molybdenum in the scales and NiO·TiO2 was also increased, while at lower temperatures NiO was combined preferentially with NiO·MoO3 and decreased the NiO·TiO2 content in the surface layer of scales.<BR>(3) From measurements of the surface recession, it was found that the progress of oxidation of all the alloys at 1000°C was parabolic and the parabolic rate constant increased in proportion to the molybdenum content. But at 1300°C, the surface layer of scales became porous and no parabolic relation was found in all the alloys.

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