HIGH TEMPERATURE PROTECTIVE COATINGS FOR GRAPHITE
Abstract
The evaporation of iridium in the presence of oxygen and water vapor to temperatures of 1300C; the results of studies involving carbon diffusion through iridium; the permeability of iridium, rhodium, ZRO2, HFO2, and THO2 to oxygen at temperatures of 2000C; the coating of graphite with iridium, including the carbon iridium eutectic temperature determination; the reactions of iridium and rhodium with ZRB2, HFB2, ZRC, HFC, and THC2; the kinetics of the carbothermic reduction of ZRO2, HFO2, and THO2 to temperatures in excess of 2000C; the chemical reactions of graphite with ZRB2 and HFB2; and arc plasma tests of iridium-coated graphite. the diffusivity, permeability, and kinetic data are presented in the form of mathematical expressions. A mechanism for the diffusion of oxygen through the refractory oxides based on ion vacancy transport is presented.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1964
- Accession Number
- AD0608092
Entities
People
- A. W. Smith
- E. P. Schram
- H. F. Volk
- J. M. Criscione
- R. A. Mercuri