Accession Number : ADA297663

Title :   Sodium Sulfate Hot Corrosion of Silicon Carbide Fiber-Reinforced Calcium Aluminosilicate.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s) : Oppici, Maria A.

PDF Url : ADA297663

Report Date : MAR 1995

Pagination or Media Count : 67

Abstract : The effects of sodium sulfate hot corrosion on the microstructure of silicon carbide fiber-reinforced calcium aluminosilicate glass-ceramic matrix composite were investigated using optical microscopy, scanning electron microscopy (SEM) and x-ray diffraction (XRD). Hot corrosion of samples at 900 deg C for 50 hours in both air and argon was investigated. SEM and XRD investigations of the sample exposed in air revealed a complex mixture of wollastonite, nepheline and albite whereas exposure in argon showed pseudowollastonite, nepheline and calcium sulfide. It was observed that the presence of Na2SO4 enhanced the oxidation of the silicon carbide fiber to silica which further reacted to form the products of corrosion. jg p.2

Descriptors :   *CALCIUM, *CORROSION, *FIBER REINFORCED COMPOSITES, *SILICON CARBIDES, *SODIUM SULFATES, SCANNING ELECTRON MICROSCOPES, MICROSTRUCTURE, ALUMINUM COMPOUNDS, AIR, SILICON DIOXIDE, HIGH TEMPERATURE, CERAMIC MATRIX COMPOSITES, X RAY DIFFRACTION, THESES, GLASS, MICROSCOPY, ELECTRON MICROSCOPY, OPTICAL ANALYSIS, OXIDATION, ARGON, SULFIDES, SODIUM SILICATES.

Subject Categories : Inorganic Chemistry
      Ceramics, Refractories and Glass
      Laminates and Composite Materials
      Atomic and Molecular Physics and Spectroscopy
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE