THE OXIDATION KINETICS OF ZIRCONIUM CARBIDE
Journal Article
·
· Trans. AIME
OSTI ID:4724730
The oxidation kinetics of ZrC were studied at 450 to 580 un. Concent 85% C in oxygen pressures from 6.5 x 10/sup -5/ to 1 atm using a thermogravimetric apparatus and sized powder samples. Two parallel rate controlling processes were observed. A surface reaction occurring at the ZrC - ZrO/sub 2/ phase boundary accounted for most of the oxidation and had an activation enthalpy of 46 kcal/mole. The other process, believed to be diffusion of O into the ZrC lattice partially replacing C, had an activation enthalpy of 53 kcal/mole. The enthalpy for chemisorption of O on ZrC was determined to be -13 kcal/ mole. Water vapor in the presence of O accelerated the surface reaction rate. (auth)
- Research Organization:
- Univ. of Utah, Salt Lake City
- NSA Number:
- NSA-17-023368
- OSTI ID:
- 4724730
- Journal Information:
- Trans. AIME, Journal Name: Trans. AIME Vol. Vol: 227
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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OSTI ID:4732429