A Study of Oxidation Kinetics of Nickel Metal in Flowing Air and Oxygen-Nitrogen Mixtures
Abstract
A study was mad he oxidation kinetics of nickel metal sheet in flowing air and in oxygen-nitrogen mixtures of varying composition. The study covered the temperatures l500F, l750 F, 2000 F, 2250 F, and 2500 F and covered flow conditions of natural convection and 0.065, 0.130, 0.205, and 0.280 standard ft3/min for the air study and 0.130 and 0.280 standard ft5/min for the oxygen-nitrogen mixture study. The oxygen partial pressures of the gas mixtures used were 380, 76, 38, and 7.6 mm mercury. A thermogravimetric technique was used to obtain the rate data. The data showed the reaction in the thick-film region to follow a parabolic-rate-law characteristic of a mechanism in which diffusion through a crystalline solid is rate controlling. The reaction-rate constants and energy of activation obtained agree reasonably well with most other experiments in the literature in which there was no forced flow of gas. This study showed no effect of flow on the reaction-rate constants for air but did show a slight decrease in reaction-rate constants for an approximately doubled flow rate for the oxygen-nitrogen gas mixtures. Examinations of the nickel and the oxide by X-ray diffraction and optical microscopy were performed.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1964
- Accession Number
- ADA397258
Entities
People
- B. W. Lewis
- D. J. Progar
Organizations
- National Aeronautics and Space Administration