Accession Number : ADA188158

Title :   High Temperature Oxidation Studies on Alloys Containing Dispersed Phase Particles and Clarification of the Mechanism of Growth of SiO2.

Descriptive Note : Annual rept. no. 2, 15 Aug 86-14 Aug 87,

Corporate Author : PENNSYLVANIA STATE UNIV UNIVERSITY PARK

Personal Author(s) : Munn, B ; Park, S W ; Simkovich, G

PDF Url : ADA188158

Report Date : Sep 1987

Pagination or Media Count : 34

Abstract : In the present investigation, the effects of dispersed SiO2 particles on the high temperature oxidation behavior of and alloys were studied. This study differs from previous investigations in that larger volume percents of SiO2 (5-40 vol%) were incorporated into the alloys. Kinetic studies were done using an automatic recording semi-micro balance under the desired conditions (1 atm O2 and 1273, 1373, 1373K). Surface topographies of oxidized specimens were also prepared and examined optically and by scanning electron microscopy. Standard x ray diffraction techniques were employed to identify the phases present in the scale. Based upon extensive results obtained for the Ni-Cr-SiO2 alloy a model for oxide formation in this system is proposed. The results obtained for the Fe based system will also be presented in this report.

Descriptors :   *OXIDATION, *NICKEL ALLOYS, *BINARY ALLOYS, CHROMIUM ALLOYS, DISPERSIONS, ELECTRON MICROSCOPY, ELECTRONIC SCANNERS, HIGH TEMPERATURE, KINETICS, PARTICLES, SURFACES, IRON ALLOYS, OXIDATION RESISTANCE, SILICON DIOXIDE, NITRIDES, OXIDES, PROTECTIVE COATINGS, MICROSTRUCTURE

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE