OXIDATION OF BORON CARBIDE BY AIR, WATER, AND AIR-WATER MIXTURES AT ELEVATED TEMPERATURES

Journal Article · Thu Aug 01 04:00:00 EDT 1963 · Journal of the Electrochemical Society (U.S.) Absorbed Electrochem. Technol.

DOI:https://doi.org/10.1149/1.2425901· OSTI ID:4670221

Litz, L M; Mercuri, R A

A study of the oxidation of boron carbide powder showed measurable reactions at temperatures as low as 250 deg C with H/sub 2/O vapor and 450 deg C in dry air. Removal of the B/sub 2/O/sub 3/ oxidation product by H/sub 2/O vapor occurs at a rate in excess of the oxidation rate below 550 to 600 deg C. The presence of B/sub 2/O/sub 3/ on the B/sub 4/C surface was found to inhibit the oxidation by H/sub 2/O but not by air. Linear dependence of rate on the partial pressure of H/sub 2/O was observed. The activation energy for the H/sub 2/O--B/ sub 4/C reaction was 11 kcal/mole/ deg C while that for the air--B/sub 4/C reaction was 45 kcal/mole. Oxidation by dry air occurs at a lower rate than with H/sub 2/O vapor until approximately 700 deg C (for 235 mm H/sub 2/O partial pressure). (auth)

• Research Organization: Union Carbide Corp., Parma, Ohio
• Sponsoring Organization: USDOE
• NSA Number: NSA-17-032523
• OSTI ID: 4670221
• Journal Information: Journal of the Electrochemical Society (U.S.) Absorbed Electrochem. Technol., Journal Name: Journal of the Electrochemical Society (U.S.) Absorbed Electrochem. Technol. Vol. Vol: 110; ISSN JESOA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

AIR
BORON CARBIDES
BORON OXIDES
HIGH TEMPERATURE
METALS, CERAMICS, AND OTHER MATERIALS
MIXING
OXIDATION
PRESSURE
REACTION KINETICS
THERMODYNAMICS
WATER