日本金属学会誌

J. Japan Inst. Metals, Vol. 43, No. 12 (1979),
pp. 1144-1150

Initial Oxidation Process of Ni-Nb Alloys at High Temperature ---Application of High Energy Ion Backscattering Analysis for Oxidation at PO_2=40 Pa---

Toshiaki Yoneoka1, Michio Yamawaki2 and Masayoshi Kanno1

1Faculty of Engineering, The University of Tokyo, Tokyo
2Research Center for Nuclear Science and Technology, The University of Tokyo, Tokyo

Abstract:

The oxidation behavior of 95Ni-5Nb and 90Ni-10Nb alloys was investigated at PO_2=40 Pa and 1023 K by using the 16O ion backscattering analysis and they were compared with the preceding study of those obtained at the low pressure of PO_2=6×10-2 Pa. The surface of each alloy was covered by either a thin smooth NiO layer or rough nodular NiO oxides. The thickness of the smooth oxide layer was measured by means of 16O ion backscattering. The formation of an internal oxidation zone was identified by the backscattering method and the X-ray diffraction analysis, etc. The thickness of this zone and the size of the internal oxide particle were determined and a considerable part of the weight gain was attributed to the internal oxidation. The internal oxide particles were identified to be mainly T-Nb2O5.


(Received 1979/04/19)

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