Enhanced thermal capacity aerogels summary report for FY 1993

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Description

In a continuation of work done previously, the authors have fabricated a set of silica aerogels and then chemically modified their internal surfaces for the purpose of inhibiting the effects of sintering at high temperatures. They performed surface nitridation of silica aerogels, i.e., the replacement of surface oxygen atoms with nitrogen atoms, by reacting ammonia gas with the silica surfaces at elevated temperatures. After pre-oxidizing the aerogels, they exposed three sets of samples to anhydrous ammonia gas under different processing conditions. Each set contained silica aerogels of three different densities, 0.07 g/cc, 0.16 g/cc, and 0.29 g/cc. The treated samples, ... continued below

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13 p.

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Hrubesh, L.W.; Coronado, P.R. & Poco, J.F. December 1, 1993.

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Description

In a continuation of work done previously, the authors have fabricated a set of silica aerogels and then chemically modified their internal surfaces for the purpose of inhibiting the effects of sintering at high temperatures. They performed surface nitridation of silica aerogels, i.e., the replacement of surface oxygen atoms with nitrogen atoms, by reacting ammonia gas with the silica surfaces at elevated temperatures. After pre-oxidizing the aerogels, they exposed three sets of samples to anhydrous ammonia gas under different processing conditions. Each set contained silica aerogels of three different densities, 0.07 g/cc, 0.16 g/cc, and 0.29 g/cc. The treated samples, together with companion untreated reference samples, were sent to NASA Ames Research Laboratory for high temperature testing. They also fabricated two carbon aerogel cylinders, 7 cm diameter x 1.5 cm thick. These samples were also delivered to NASA Ames Research Laboratory for high temperature tests.

Physical Description

13 p.

Notes

OSTI as DE94008888

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  • Other Information: PBD: Dec 1993

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  • Other: DE94008888
  • Report No.: UCRL-CR--115799-Summ.
  • Grant Number: W-7405-ENG-48
  • DOI: 10.2172/142544 | External Link
  • Office of Scientific & Technical Information Report Number: 142544
  • Archival Resource Key: ark:/67531/metadc621290

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  • December 1, 1993

Added to The UNT Digital Library

  • June 16, 2015, 7:43 a.m.

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  • Feb. 23, 2016, 6:43 p.m.

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Hrubesh, L.W.; Coronado, P.R. & Poco, J.F. Enhanced thermal capacity aerogels summary report for FY 1993, report, December 1, 1993; California. (digital.library.unt.edu/ark:/67531/metadc621290/: accessed December 10, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.