TUFI/AETB-12 Diffusion Layer

Name: TUFI/AETB-12 Diffusion Layer
Database: NASA Ames Thermal Protection Materials
Category: Silicon-Based Reusable Composites: Rigid Ceramic Tiles
Composition: 2.5% SiB4, 77.5% (5.75% B2O3, 94.25% SiO2), 20% MoSi2
Manufacturer: Boeing, United Space Alliance (USA)
Technical Readiness Level: 8
Last Modified: 2001-08-24

Description:

  • The TUFI/AETB-12 diffusion layer is the layer of material with variable density just below the TUFI external surface that occurs in AETB-12. It was successfully flown on the shuttle as an experimental diffusion layer on the top of the orbiterÕs body flap.

Point of Contact:

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

Pictures:

Properties at Standard Conditions
SI Units (MKS)
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Property Value Units Uncertainty Source STP Reference Last Modified Additional Data
Density1 9.61e+02 kg/m^3 48.1 measured assumed/assumed 1 2006-01-05
Specific Heat2 7.95e+02 J/kg-K 39.8 predicted TRUE 2006-01-05
Emissivity3 8.64e-01 - 4.32e-02 predicted assumed/assumed 2 2006-01-05
Multiple Use Temperature Limit4 1.59e+03 K 79.4 predicted assumed/assumed 2006-01-05
Single Use Temperature Limit5 1.87e+03 K 93.3 predicted assumed/assumed 2006-01-05

Notes:

  • 1. Value represents the average density through the TUFI layer. Actual density varies through the coating layer.
  • 2. Specific Heat predicted using rule of mixtures and data from an ASTM handbook.
  • 3. Predicted from measurements of AETB-8 and AETB-20 coated tiles.
  • 4. Predicted based on arcjet and or flight test data
  • 5. Predicted based on arcjet and or flight test data

Property References:

  • 1. D.A. Stewart, D.B. Leiser: Characterization of the Thermal Conductivity for Advanced Toughened Uni-Piece Fibrous Insulations:AIAA Paper 93-2755:AIAA:Jul. 1993:TPSX Ref. #2.
  • 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.

General References:

  • 1. D.B. Leiser, R. Churchward, V. Katvala, D.A. Stewart: Advanced Porous Coating for Low Density Ceramic Insulation Materials:J. Am. Ceram. Soc.:1989:TPSX Ref. #20.
  • 2. D.B. Leiser, M. Smith, R.A. Churchward, V.W. Katvala: Toughened Uni-Piece Fibrous Insulation:U.S. Patent No. 5,079,082:1992:TPSX Ref. #21.
  • 3. D.A. Stewart, D.B. Leiser: Characterization of the Thermal Conductivity for Advanced Toughened Uni-Piece Fibrous Insulation:AIAA Paper 93-2755:Jul. 6-9, 1993:TPSX Ref. #22.