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Fundamental studies on the nature and properties of ceramic fiber insulationSilica and mullite fibers used to fabricate reusable surface insulation (RSI) for the space shuttle orbiter may devitrify/recrystallize within the temperature range anticipated upon reentry. This is shown to be dependent upon impurity level, temperature, and time at temperature. It is determined that the effects of the material improvement and optimization program are positive. The degree of crystallinity is shown to have a predominant effect upon the strength of fabricated RSI tile, and limits are determined. Models are developed to predict tensile strengths and shrinkage rates of silica tile based upon readily measurable parameters. Thermal cycling which simulates reentry results in an increase in the crystallinity and in the porosity of tile coatings.
Document ID
19760007183
Document Type
Contractor Report (CR)
Authors
Mueller, J. I. (Washington Univ. Seattle, WA, United States)
Whittemore, O. J., Jr. (Washington Univ. Seattle, WA, United States)
Scott, W. D. (Washington Univ. Seattle, WA, United States)
Miller, A. D. (Washington Univ. Seattle, WA, United States)
Smiser, L. W. (Washington Univ. Seattle, WA, United States)
Leiser, D. B. (Washington Univ. Seattle, WA, United States)
Date Acquired
September 3, 2013
Publication Date
January 1, 1975
Subject Category
NONMETALLIC MATERIALS
Report/Patent Number
NASA-CR-137793
Funding Number(s)
CONTRACT_GRANT: NAS2-6541
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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