RCG Coating

Name: RCG Coating
Database: NASA Ames Thermal Protection Materials
Category: Coatings
Composition: 2.5% SiB4, 97.5% (94.25% B2O3, 5.75% SiO2)
Manufacturer: Boeing, United Space Alliance (USA)
Technical Readiness Level: 9
Last Modified: 2001-10-01

Description:

  • Reaction Cured Glass (RCG) is an amorphous, low expansion coefficient, high emissivity coating capable of application to high silica insulation substrates with temperature capability to about 2800 ¡F.

Point of Contact:

  • Daniel Leiser
  • NASA Ames Research Center
  • dleiser@mail.arc.nasa.gov

Pictures:

Properties at Standard Conditions
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Property Value Units Uncertainty Source STP Reference Last Modified Additional Data
Density 1.04e+02 lbm/ft^3 5.20e+00 measured assumed/assumed 3 2006-01-05
Thermal Conductivity (Isotropic)1 1.35e-04 Btu/ft-s-R 6.76e-06 measured TRUE 3 2006-01-05
Specific Heat 1.90e-01 Btu/lbm-R 9.51e-03 measured TRUE 3 2006-01-05
Emissivity2 8.73e-01 - 4.37e-02 measured TRUE 1 2006-01-05
Multiple Use Temperature Limit3 2.96e+03 R 1.48e+02 predicted assumed/assumed 3 2006-01-05
Single Use Temperature Limit4 3.36e+03 R 1.68e+02 predicted assumed/assumed 3 2006-01-05
Tensile Strength (Isotropic) 5.76e+05 psf 2.88e+04 measured assumed/assumed 4 2006-01-05
Tensile Modulus (Isotropic) 5.76e+08 psf 2.88e+07 measured assumed/assumed 4 2006-01-05
Compressive Strength (Isotropic) 1.44e+06 psf 7.21e+04 measured assumed/assumed 4 2006-01-05
Coefficient of Thermal Expansion (Isotropic)5 5.70e-07 1/R 2.85e-08 measured TRUE 4 2006-01-05
Oxygen Recombination Coefficient6 1.32e-03 - 6.59e-05 interpolated TRUE 2 2006-01-05
Nitrogen Recombination Coefficient7 5.00e-04 - 2.50e-05 interpolated TRUE 2 2006-01-05
Air Recombination Coefficient8 4.23e-03 - 2.12e-04 interpolated nonstp 2 2006-01-05

Notes:

  • 1. Dynamic values for transient environments. Thermal Conductivity calculated using experimentally measured temperatures values.
  • 2. Room temperature value is measured. The higher temperature values are extrapolated
  • 3. Predicted based on arcjet and or flight test data. Temperature limit can vary depending on substrate material. Refer to Reference #23, Appendix A: Material Properties
  • 4. Predicted based on arcjet and or flight test data. Temperature limit can vary depending on substrate material. Refer to Reference #23, Appendix A: Material Properties
  • 5. Values based on 0.014in-thick coating on reusable ceramic tile.
  • 6. Values based on Arrhenius curve fits [K exp(B/T)] of experimental data. T<502K: K=5E-3, B=-400; 502K<T<978K: K=1.6E-4, B=1326; 978K<T<1617K: K=5.2, B=-8835; T>1617K: K=39E-9, B=21410
  • 7. Values based on Arrhenius curve fits [K exp(B/T)] of experimental data. T<465K: K=5E-4, B=0; 465K<T<905K: K=2E-5, B=1500; 905K<T<1575K: K=10, B=-10360; T>1575K: K=6.2E-6, B=12100
  • 8. Values based on Arrhenius curve fits [K exp(B/T)] of experimental data. 1210K<T<1653K: K=3.2, B=-8285; T>1653K: K=1.5e-5, B=12000

Property References:

  • 1. J. Ridge, J. Marschall: Estimation of Temperature Dependent Emissivities from Room Temperature Spectral Reflectance Measurements on Coated and Uncoated TPS Tiles:ELORET/Thermosciences Institute Report TSI-STM01-96-01:Sep. 1996:TPSX Ref. #10.
  • 2. D.A. Stewart: Surface Catalysis and Characterization of Proposed Candidate TPS for Access-to-Space Vehicles:NASA TM-112206:Jul. 1997:TPSX Ref. #19.
  • 3. anon: Space Shuttle Program Thermodynamic Design Data Book. Penetrations.:SD73-SH-0226:Rockwell International, Downey, CA:Jan. 1981:TPSX Ref. #23.
  • 4. anon: FRCI-12: Fibrous Refractory Composite Insulation Material:Lockheed Missiles & Space Co. Data Sheet:Jan. 1987:TPSX Ref. #115.

General References:

  • 1. S. Amanda Chiu, William C. Pitts: Reusable Surface Insulations for Reentry Spacecraft:AIAA Paper 91-0695:Jan. 1991:TPSX Ref. #3.
  • 2. J. Ridge, J. Marschall: Estimation of Temperature Dependent Emissivities from Room Temperature Spectral Reflectance Measurements on Coated and Uncoated TPS Tiles:ELORET/Thermosciences Institute Report TSI-STM01-96-01:Sep. 1996:TPSX Ref. #10.
  • 3. H.E. Goldstein, D.B. Leiser, V.W. Katvala: Reaction Cured Borosilicate Glass Coating for Low density Fibrous Silica Insulation, Borate Glasses: Structure, Properties, Applications:Plenum Publishing Corp.:1978:TPSX Ref. #16.
  • 4. H.E. Goldstein, D.B. Leiser, V.W. Katvala: Reaction Cured Glass and Glass Coatings:U.S. Patent No. 4,093,771:1978:TPSX Ref. #17.
  • 5. D.A. Stewart, J. Pallix, L. Esfahani: Surface Catalytic Efficiency of Candidate Ceramic Thermal Protection Materials for SSTO:NASA CDTM-20007:Mar. 1995:TPSX Ref. #18.