Accession Number : ADA004169

Title :   Investigation of High-Temperature Oxidation Reactions.

Descriptive Note : Final rept. 1 Apr 71-31 Oct 73,


Personal Author(s) : Rapp,Robert A. ; Hirth,John P.

Report Date : OCT 1974

Pagination or Media Count : 22

Abstract : In this research, high temperature oxidation reactions were studied, with detailed experimental investigation of two problems: (1) the compatibility of components in multi-phase, high temperature systems as exemplified by displacement reactions in the solid state, and (2) the high temperature oxidation of Ni-Cr-W and Co-Cr-W alloys. From a knowledge of the pertinent thermodynamic exemplified by displacement and (2) the high temperature oxidation of Ni-Cr-W reactions in the solid state, and Co-Cr-W alloys. From a knowledge of the pertinent thermodynamic and transport parameters of the reaction couples (Nickel/Cuprous Oxide, Cobalt/Cuprous Oxide, Iron/Cuprous Oxide, and Iron/Nickel Oxide), the selection of the product morphologies and the resulting kinetics of reaction were predicted and compared with experiment. A detailed theory was presented and tested to interpret the aggregate-lamellar product microstructure of the Iron/Cuprous Oxide couple. The effect of tungsten additions on the oxidation behavior of Nickel-20 Chromium alloys and of Cobalt-30 Chromium alloys was studied by thermogravimetric, electron microprobe, and metallographic methods. For each set of alloys a partitioning of W to the metallic phase was found, and the resulting phase changes were interpreted in terms of the ternary phase diagrams for the alloys.

Descriptors :   *Oxidation, *Nickel alloys, *Chromium alloys, *Tungsten alloys, *Cobalt alloys, Displacement reactions, High temperature, Copper compounds, Nickel compounds, Scale, Compatibility, Reaction kinetics, Transport properties, Phase transformations, Morphology, Electron probes, Tungsten compounds, Chromium compounds

Subject Categories : Physical Chemistry
      Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE