NDLI: Durability of silica-protected ceramics in combustion atmospheres

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Durability of silica-protected ceramics in combustion atmospheres

Content Provider	NASA Technical Reports Server (NTRS)
Author	Fox, Dennis S. Jacobson, Nathan S. Opila, Elizabeth J. Smialek, James L.
Copyright Year	1995
Description	This overview of oxidation and corrosion effects on silica-protected ceramics and composites is divided into two parts: (1) External effects and (2) Internal effects. In regard to the first part, the literature indicates silica the best of the common protective oxides in pure oxygen. However in actual applications, there are four major degradation routes which must be considered: (1) Formation of SiO(g); (2) water vapor enhancement of oxidation rate of Si(OH)4 volatiles; (3) low level metal cation enhancement of oxidation rate; and (4) molten salt and slag corrosion. Several protective coating concepts have been discussed, which may minimize these effects. Internal effects deal with a microcrack providing a path for oxygen ingress to the oxygen sensitive fiber and fiber coating. This is a critical area of study for theses materials. Possible solutions involve a fluid glass to fill the cracks and/or oxygen getting along the walls of the crack.
File Size	6607960
Page Count	14
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19970003418
Archival Resource Key	ark:/13960/t3tt9jk00
Language	English
Publisher Date	1995-01-01
Access Restriction	Open
Subject Keyword	Nonmetallic Materials Microcracks Ceramic Fibers Molten Salts Silicon Carbides Water Vapor Silicon Dioxide Thin Films Degradation Corrosion Impurities Molybdenum Compounds Reinforcing Fibers Silicon Nitrides Oxidation Protective Coatings Matrix Materials Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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