OXIDATION OF RENE 41 AND THORIATED NICKEL WIRES BETWEEN 1600 F AND 2000 F
Abstract
Oxidation rates of 10 and 20 mil nickel-base superalloy wires, Rene 41 and Thoriated Nickel, were measured over the range 1600 F to 2000 F for up to 1000 minutes using gravimetric methods. Rene 41 wire oxidation was characterized by the rapid growth of A1203 caused by a high concentration gradient of aluminum. Formation of this protective A1203 scale resulted in much slower oxidation of chromium from the normal parabolic rates observed for 50 mil Rene 41 sheet. A theoretical analysis based on diffusion theory for cylindrical shapes was presented to explain the measured oxidation rates. TD Nickel oxidation exhibited a parabolic rate of reaction, controlled by the growth of NiO. Both alloys suffered increases in oxidation rates with increases in temperature. Oxidation of Rene 41 wire increased with the application of stress, while TD Nickel oxidation was insensitive to stress. Internal oxidation (A1203) of Rene 41 occurred, whereas the high density surface scale of TD Nickel and lack of alloys within its matrix prevented internal oxidation. Neither alloy appeared sensitive to a decrease in 02 partial pressure.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1964
- Accession Number
- AD0610241
Entities
People
- Robert A. Rosenberg
Organizations
- Air Force Institute of Technology