Quarterly Progress Report of Research and Development in a Thermal Insulation Study, September - November, 1968

摘要

Results of long-term thermal conductivity tests on copper opacified and nickel opacified multi-layer insulations are up-dated. The 1800F nickel and Refrasil quartz instability problems are discussed in detail. Molybdenum and woven quartz cloth are recommended as alternate materials at this temperature. Apparent thermal conductivity data (flat plate tests) are presented for three nickel multi-foil insulations and the nickel opacified fibrous multi-layer system. Thermal performance is correlated to temperature and compressive load (layer density). The resultant empirical thermal conductivity expressions are presented and applied. Longitudinal thermal conductivity data for aluminum opacified glass multi-layer insulation are given. Experimental technique and sample design are described. Results of the exposed edge effects analytical and experimental program are presented and discussed. Two multi-foil systems -- aluminum-106 glass and nickel-Refrasil --- were evaluated. The vacuum enclosure program has been completed. The Hastelloy-X specimen was analyzed in as-received condition and after 1400F, 10,000-hour exposure. Pertinent results on vacuum integrity and material strength are given. Magnified surface photographs and photomicrographs are presented and discussed.