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There are a total of 83 record(s) matching your query.
Sorted by: Date Added To NTRS in Descending order
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Molten salt corrosion of SiC and Si3N4
Author(s): Jacobson, Nathan S.; Smialek, James L.; Fox, Dennis S.
Abstract: Industrial systems such as heat engines and heat exchangers involve harsh environments. The structural materials are subjected to high temperatures as well as corrosive gases and condensed phases. Past experience with metal ...
NASA Center: Glenn Research Center
Publication Year: 1988
Added to NTRS: 2005-08-25
Accession Number: 89N11912; Document ID: 19890002541; Report Number: E-4370, NAS 1.15:101346, NASA-TM-101346
Thermochemical Degradation Mechanisms for the Reinforced Carbon/Carbon Panels on the Space Shuttle
Author(s): Jacobson, Nathan S.; Rapp, Robert A.
Abstract: The wing leading edge and nose cone of the Space Shuttle are fabricated from a reinforced carbon/carbon material (RCC). The material attains its oxidation resistance from a diffusion coating of SiC and a glass sealant. ...
NASA Center: Glenn Research Center
Publication Year: 1995
Added to NTRS: 2005-08-25
Accession Number: 96N28079; Document ID: 19960026429; Report Number: E-9256, NAS 1.15:106793, NASA-TM-106793
Corrosion of Mullite by Molten Salts
Author(s): Jacobson, Nathan S.; Lee, Kang N.; Yoshio, Tetsuo
Abstract: The interaction of molten salts of different Na2O activities and mullite is examined with furnace and burner tests. The more-acidic molten salts form small amounts of Al2O3; the more-basic molten salts form various ...
NASA Center: Glenn Research Center
Publication Year: 1996
Added to NTRS: 2005-08-25
Accession Number: 97N21336; Document ID: 19970019643; Report Number: NAS 1.15:112759, NASA-TM-112759
Double Knudsen cell system for alloy activity measurements by mass spectrometry
Author(s): Jacobson, Nathan S.
Abstract: A double Knudsen cell in conjunction with a high temperature mass spectrometer is one of the most versatile methods for direct, rapid measurements of alloy activities. Such an apparatus involves the use of a cell containing ...
NASA Center: Glenn Research Center
Publication Year: 1995
Added to NTRS: 2005-08-25
Accession Number: 96N23464; Document ID: 19960018033; Report Number: NAS 1.15:111233, NASA-TM-111233
Refractory oxide coatings on SiC ceramics
Author(s): Lee, Kang N.; Jacobson, Nathan S.; Miller, Robert A.
Abstract: Silicon carbide with a refractory oxide coating is potentially a very attractive ceramic system. It offers the desirable mechanical and physical properties of SiC and the environmental durability of a refractory oxide. The ...
NASA Center: Glenn Research Center
Publication Year: 1994
Added to NTRS: 2005-08-25
Accession Number: 95N10150; Document ID: 19950003738; Report Number: E-9013, NAS 1.15:106677, NASA-TM-106677
Thermodynamic Database for the NdO(1.5)-YO(1.5)-YbO(1.5)-ScO(1.5)-ZrO2 System
Author(s): Jacobson, Nathan S.; Copland, Evan H.; Kaufman, Larry
Abstract: A database for YO(1.5)-NdO(1.5)-YbO(1.5)-ScO(1.5)-ZrO2 for ThermoCalc (ThermoCalc AB, Stockholm, Sweden) has been developed. The basis of this work is the YO(1.5)-ZrO2 assessment by Y. Du, Z. Jin, and P. Huang, ...
NASA Center: Glenn Research Center
Publication Year: 2001
Added to NTRS: 2005-08-25
Document ID: 20020011686; Report Number: E-12681, NAS 1.15:210753, NASA/TM-2001-210753
New Generation of Plasma-Sprayed Mullite Coatings on Silicon Carbide
Author(s): Lee, Kang N.; Miller, Robert A.; Jacobson, Nathan S.
Abstract: Mullite is promising as a protective coating for silicon-based ceramics in aggressive high-temperature environments. Conventionally plasma-sprayed mullite on SiC tends to crack and debond on thermal cycling. It is shown that ...
NASA Center: Glenn Research Center
Publication Year: 1995
Added to NTRS: 2005-08-25
Accession Number: 97N70210; Document ID: 19970003449; Report Number: NAS 1.15:112127, NASA-TM-112127
Plumbrook Hypersonic Tunnel Facility Graphite Furnace Degradation Mechanisms
Author(s): Jacobson, Nathan S.
Abstract: A recent rebuild revealed extensive degradation to the large graphite induction furnace in the Hypersonic Tunnel Facility (HTF). This damage to the graphite blocks and insulating felt is examined and modeled with ...
NASA Center: Glenn Research Center
Publication Year: 1999
Added to NTRS: 2005-08-25
Document ID: 19990040430; Report Number: E-11520, NAS 1.15:208907, NASA/TM-1999-208907
Thermal-Mechanical Stability of Single Crystal Oxide Refractive Concentrators for High-Temperature Solar Thermal Propulsion
Author(s): Zhu, Dongming; Jacobson, Nathan S.; Miller, Robert A.
Abstract: Single crystal oxides such as yttria-stabilized zirconia (Y2O3-ZrO2), yttrium aluminum garnet (Y3Al5O12, or YAG), magnesium oxide (MgO) and sapphire (Al2O3) are candidate refractive secondary concentrator materials for high ...
NASA Center: Glenn Research Center, Marshall Space Flight Center
Publication Year: 1999
Added to NTRS: 2005-08-25
Document ID: 19990021367; Report Number: E-11524, NAS 1.15:208899, NASA/TM-1999-208899
Space Shuttle Pinhole Formation Mechanism Studies
Author(s): Jacobson, Nathan S.
Abstract: Pinholes have been observed to form on the wing leading edge of the space shuttle after about 10-15 flights. In this report we expand upon previous observations by Christensen (1) that these pinholes often form along cracks ...
NASA Center: Glenn Research Center
Publication Year: 1998
Added to NTRS: 2005-08-25
Document ID: 19990009562; Report Number: E-11351, NAS 1.15:208659, NASA/TM-1998-208659
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