EFFECT OF Si ON HIGH TEMPERATURE OXIDE FILMS IN HEAT-RESISTING ALLOYS (in Japanese)
By use of the transmission-electron diffraction method, the initial oxide films of A.I.S.I. Type 302 B (2.45% Si). 19-9 DL (0.50% Si). Durimet 20 (1.27% Si), and Nichrome (JIS No. 1. 0.5 approximately 1.5% Si) oxidized in air at 700 to 900 deg C were studied. A solution of bromine in methanol (1: 50 by vol.) was satisfactorily used for isolating the oxide films from these ailoys. The electron-diffraction patterns obtained from initiai oxide films (700 to 900 deg C) of the ailoys showed the existence of rhombchedrai-type (mainly Cr/sub 2/O/ sub 3/ or alpha -(Cr,Fe)/sub 2/O/sub 3/) and spinel-type oxides, and no such special oxides as SiO/sub 2/ could be observed in the patterns. However, alpha -cristobalite crystals were detected when the films were heated at 1200 deg C for 1 to 3 hr. This showed that the special heat-resisting films consisting of amorphous SiO/sub 2/ are formed on the surfaces of alloys in the earliest stage of oxidation. (auth)
- Research Organization:
- Originating Research Org. not identified
- NSA Number:
- NSA-15-006428
- OSTI ID:
- 4095339
- Journal Information:
- Nippon Kinzoku Gakkaishi (Japan), Journal Name: Nippon Kinzoku Gakkaishi (Japan) Vol. Vol: 24; ISSN NIKGA
- Country of Publication:
- Country unknown/Code not available
- Language:
- Japanese
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KINETICS OF THE OXIDATION OF CHROMIUM CARBIDES
Related Subjects
ALLOYS
BROMINE
CHROMIUM ALLOYS
CHROMIUM OXIDES
CONFIGURATION
CRISTOBALITE
CRYSTALS
DIFFRACTION
DURIMET
ELECTRONS
FILMS
HEAT RESISTING ALLOYS
HEAT RESISTING METALS
HIGH TEMPERATURE
IRON ALLOYS
LATTICES
METALS, CERAMICS, AND OTHER MATERIALS
METHANOL
MINERALS
NICHROME
NICKEL ALLOYS
OXIDATION
OXIDES
PHASE DIAGRAMS
SILICON
SILICON OXIDES
SOLUTIONS
SPINELS
STAINLESS STEELS
SURFACES