Isothermal oxidation behavior of Mo-Si-B intermetallics at 1450 C

Journal Article · Tue Oct 01 04:00:00 EDT 1996 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/j.1151-2916.1996.tb09046.x· OSTI ID:413327

Meyer, M K; Akinc, M ^[1]

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1. Ames Lab., IA (United States)

Five Mo-Si-B multiphase intermetallic compositions were synthesized and oxidized isothermally at 1,450 C in flowing air. Average mass change rates were strongly dependent on sample composition, particularly boron content. An Mo{sub 5}Si{sub 3} matrix material containing 1.6 wt% boron exhibited parabolic mass gain with a rate of 5.3 {times} 10{sup {minus}4} mg{sup 2}/(cm{sup 4}{center_dot}h), while a similar material with 0.14 wt% boron oxidized rapidly in a linear manner at a rate of {minus}3.3 mg/(cm{sup 2}{center_dot}h). Oxidation rates of the Mo-Si-B intermetallics were compared to that of MoSi{sub 2} oxidized at 1,450 C under identical conditions.

• Sponsoring Organization: USDOE
• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 413327
• Journal Information: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 10 Vol. 79; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AIR
BORON ALLOYS
CHEMICAL COMPOSITION
HOT PRESSING
INTERMETALLIC COMPOUNDS
MELTING
MICROSTRUCTURE
MOLYBDENUM ALLOYS
OXIDATION
POWDERS
SCANNING ELECTRON MICROSCOPY
SILICON ALLOYS
SYNTHESIS
THERMAL GRAVIMETRIC ANALYSIS
X-RAY DIFFRACTION
X-RAY SPECTROSCOPY