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248
May 31, 2011
05/11
by
Prabhu, Ramadas K
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This report documents the results of a computational study done to compute the inviscid longitudinal aerodynamic characteristics of the Space Shuttle Orbiter for Mach numbers 10 and 15 at angles of attack of 40, 50, 55, and 60 degrees. These computations were done to provide limited aerodynamic data in support of the Orbiter contingency abort task. The Orbiter had all the control surfaces in the undeflected position. The unstructured grid software FELISA was used for these computations with the...
Topics: CONTROL SURFACES, ELECTRICAL RESISTIVITY, TEMPERATURE CONTROL, THERMAL CONTROL COATINGS,...
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453
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No Abstract Available
Topics: THERMAL CONTROL COATINGS, ZINC COMPOUNDS, OPTIMIZATION, PIGMENTS, RADIATION DAMAGE, THERMAL PLASMAS
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178
May 29, 2011
05/11
by
Bregman, Jesse D.; Temi, Pasquale; Rank, Davi
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Supernovae play a key role in the dynamics, structure, and chemical evolution of galaxies. The massive stars that end their lives as supernovae live for short times. Many are still associated with dusty star formation regions when they explode, making them difficult to observe at visible wavelengths. In active star forming regions (galactic nuclei and starburst regions), dust extintion is especially severe. Thus, determining the supernova rate in the active star forming regions of galaxies,...
Topics: EMISSIVITY, MICROELECTROMECHANICAL SYSTEMS, SATELLITE TEMPERATURE, TEMPERATURE CONTROL, WASTE HEAT,...
System is capable of withstanding extreme temperature environments ranging from -250 to 2300 F (116 K to 1543 K). System includes impervious, high-density, high-thermal-emittance outer coating which has low coefficient of thermal expansion matching that of insulation.
Topics: NASA Technical Reports Server (NTRS), INSULATION, REUSABLE HEAT SHIELDING, THERMAL CONTROL COATINGS
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252
Jun 1, 2011
06/11
by
Kosik, Kenneth S.; Steward, Oswald; Temple, Meredith D.; Denslow, Maria J
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One of the key tasks the developing brain must learn is how to navigate within the environment. This skill depends on the brain's ability to establish memories of places and things in the environment so that it can form cognitive maps. Earth's gravity defines the plane of orientation of the spatial environment in which animals navigate, and cognitive maps are based on this plane of orientation. Given that experience during early development plays a key role in the development of other aspects...
Topics: THERMAL CONTROL COATINGS, FRACTURE STRENGTH, FATIGUE (MATERIALS), DEFORMATION, SINTERING, ZIRCONIUM...
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Jul 9, 2010
07/10
by
Sater, B. I.; Brandhorst, H. W., Jr.; Riley, T. J.; Hart, R. E., Jr
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The multiple junction edge illuminated solar cell was devised for high voltage low current applications. Devices to be flight tested in early 1974 with 96 series connected PNN junctions in a 2 cm X 2.3 cm size deliver 36 volts at 1 milliampere. Test data of M-J cells fabricated with resistivities of 10, 50, 100, 200, 450, and 1000 ohm cm silicon are presented and problem areas are discussed. An additional potential application of the M-J cell lies in ultilization of its high intensity...
Topics: NIOBIUM ALLOYS, REENTRY EFFECTS, THERMAL CYCLING TESTS, SPACE ENVIRONMENT SIMULATION, SPACE...
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315
Jun 12, 2011
06/11
by
Bosworth, John T.; Stachowiak, Susan J
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A method has been developed for real-time stability margin measurement calculations. The method relies on a tailored-forced excitation targeted to a specific frequency range. Computation of the frequency response is matched to the specific frequencies contained in the excitation. A recursive Fourier transformation is used to make the method compatible with real-time calculation. The method was incorporated into the X-38 nonlinear simulation and applied to an X-38 robustness test. X-38 stability...
Topics: SINTERING, FRACTURE MECHANICS, SPRAYED COATINGS, THERMAL CONTROL COATINGS, DILATOMETRY, TEMPERATURE...
This final report is concerned with the tasks performed during the contract period which included spacecraft coating development, testing, and applications. Five marker coatings consisting of a bright yellow handrail coating, protective overcoat for ceramic coatings, and specialized primers for composites (or polymer) surfaces were developed and commercialized by AZ Technology during this program. Most of the coatings have passed space environmental stability requirements via ground tests...
Topics: NASA Technical Reports Server (NTRS), PROTECTIVE COATINGS, THERMAL CONTROL COATINGS, OPTICAL...
A metallic close-out layer is applied to the surface of a thermal barrier coating system to seal the ceramic material in the coating. The close-out layer is glass-bead preened to densify the surface.
Topics: NASA Technical Reports Server (NTRS), CERAMICS, SEALING, SUBSTRATES, THERMAL CONTROL COATINGS,...
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Jul 9, 2010
07/10
by
Rosener, A. A.; Stephenson, M. L
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Conceptual design and fabrication of a full scale shuttle passenger couch engineering model are reported. The model was utilized to verify anthropometric dimensions, reach dimensions, ingress/egress, couch operation, storage space, restraint locations, and crew acceptability. These data were then incorported in the design of the passenger couch verification model that underwent performance tests.
Topics: SPACECRAFT STRUCTURES, SPACECRAFT TEMPERATURE, TEFLON (TRADEMARK), THERMAL CONTROL COATINGS,...
An article comprises a silicon-containing substrate and a zircon coating. The article can comprise a silicon carbide/silicon (SiC/Si) substrate, a zircon (ZrSiO.sub.4) intermediate coating and an external environmental/thermal barrier coating.
Topics: NASA Technical Reports Server (NTRS), CERAMICS, THERMAL CONTROL COATINGS, SILICON CARBIDES,...
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3.5K
Jul 11, 2010
07/10
by
NON
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Human operator dynamics during actual manual control or while monitoring the automatic control systems involved in air-to-air tracking, automobile driving, the operator of undersea vehicles, and remote handling are examined. Optimal control models and the use of mathematical theory in representing man behavior in complex man machine system tasks are discussed with emphasis on eye/head tracking and scanning; perception and attention allocation; decision making; and motion simulation and effects.
Topics: ELECTRICAL RESISTIVITY, LAMINATES, METAL FIBERS, THERMAL CONTROL COATINGS, YARNS, CONDUCTIVE HEAT...
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211
May 31, 2011
05/11
by
Mihalov, J. D
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In order to understand better source and loss processes for energetic trapped protons near Jupiter, a modification of de Pater and Goertz' finite difference diffusion calculations for Jovian equatorial energetic electrons is made to apply to the case of protons inside the orbit of Metis. Explicit account is taken of energy loss in the Jovian ring. Comparison of the results is made with Galileo Probe measurements.
Topics: CERAMIC MATRIX COMPOSITES, PROTECTIVE COATINGS, STRUCTURAL ANALYSIS, THERMAL CONTROL COATINGS,...
Improved adhesion of thermal barrier coatings to nonmetallic substrates using a dense layer of ceramic on an underlying nonmetallic substrate that includes at least one oxidizable component. The improved adhesion occurs because the application of the dense ceramic layer forms a diffusion barrier for oxygen. This diffusion barrier prevents the oxidizable component of the substrate from decomposing. The present invention applies ceramic by a process that deposits a relatively thick and dense...
Topics: NASA Technical Reports Server (NTRS), ADHESION, CERAMICS, SUBSTRATES, THERMAL CONTROL COATINGS,...
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701
Jul 5, 2010
07/10
by
Huinink, B.; Brink, K. B
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The prerequisites for realization and successful operation of commercial transportation systems using vertical takeoff aircraft are discussed. The aerodynamic characteristics of the Dornier 31 aircraft are described. The application of the DO-31 aircraft to meet the requirements for successful VTOL operations on a commercial basis is examined.
Topics: PLASMA HEATING, THERMAL CONTROL COATINGS, TITANATES, ZINC COMPOUNDS, ELECTRON PARAMAGNETIC...
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May 31, 2011
05/11
by
Ipatov, S. I.; Mather, J. C
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Our estimates of the migration of trans-Neptunian objects (TNOs) to a near-Earth space are based on the results of investigations of orbital evolution of TNOs and Jupiter-crossing objects (JCOs). The orbital evolution of TNOs was considered in many papers. Recently we investigated the evolution for intervals of at least 5-10 Myr of 2500 JCOs under the gravitational influence of all planets, except for Mercury and Pluto (without dissipative factors). In the first series we considered N=2000...
Topics: TECHNOLOGY UTILIZATION, COMPUTERIZED SIMULATION, THERMAL CONTROL COATINGS, COMPUTER AIDED DESIGN,...
This paper provides a pro tem review of the hot corrosion of zirconia-based thermal barrier coatings for engine applications. Emphasis is placed on trying to understand the chemical reactions, and such other mechanisms as can be identified, that cause corrosive degradation of the thermal barrier coating. The various approaches taken in attempts to improve the hot corrosion resistance of thermal barrier coatings are also briefly described and critiqued.
Topics: NASA Technical Reports Server (NTRS), CHEMICAL REACTIONS, HOT CORROSION, THERMAL CONTROL COATINGS,...
349
349
May 31, 2011
05/11
by
Ning, Cun-Zhen
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High frequency, narrow-band self-pulsating operation is demonstrated in two coupled vertical-cavity surface-emitting lasers (VCSELs). The coupled VCSELs provide an ideal source for high-repetition rate (over 40 GHz), sinusoidal-like modulated laser source with Gaussian-like near- and far-field profiles. We also show that the frequency of the modulation can be tuned by the inter-VCSEL separation or by DC-bias level.
Topics: CERAMICS, ZIRCONIUM OXIDES, THERMAL CONTROL COATINGS, PROTECTIVE COATINGS, MULLITES, HEAT FLUX,...
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300
Jun 9, 2011
06/11
by
Glaessgen, E. H.; Raju, I. S.; Poe, C. C., Jr
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The effect of stitches on the failure of a single lap joint configuration was determined in a combined experimental and finite element study. The experimental program was conducted to determine debond growth under static monotonic loading. The stitches were shown to delay the initiation of the debond and provide load transfer beyond the load necessary to completely debond the stitched lap joint. The experimentally determined debond length vs. applied load was used as an input parameter in the...
Topics: THERMAL CONDUCTIVITY, CERAMIC COATINGS, THERMAL CONTROL COATINGS, TEMPERATURE GRADIENTS, LOW...
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Jun 9, 2011
06/11
by
Pack, LaTunia G.; Seifert, Av
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The effects of periodic excitation on the evolution of a turbulent jet were studied experimentally. A short, wide-angle diffuser was attached to the jet exit and excitation was introduced at the junction between the jet exit and the diffuser inlet. The introduction of high amplitude periodic excitation at the jet exit enhances the mixing and promotes attachment of the jet shear-layer to the diffuser wall. Vectoring is achieved by applying the excitation over a fraction of the circumference of...
Topics: THERMAL CONTROL COATINGS, THERMAL FATIGUE, THERMAL CONDUCTIVITY, CERAMIC COATINGS, GAS TURBINE...
A bond coat composition for use in thermal barrier coatings comprises a NiAl--CoCrAlY matrix containing particles of AlN dispersed therein. The bond coat composition is prepared by croymilling NiAl and CoCrAlY in liquid nitrogen.
Topics: NASA Technical Reports Server (NTRS), JOINTS (JUNCTIONS), OXIDATION, THERMAL CONTROL COATINGS,...
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Jun 11, 2011
06/11
by
Blenk, Herman
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In Prandtl's airfoil theory the monoplane was replaced by a single lifting vortex line and yielded fairly practical results. However, the theory remained restricted to the straight wing. Yawed wings and those curved in flight direction could not be computed with this first approximation; for these the chordwise lift distribution must be taken into consideration. For the two-dimensional problem the transition from the lifting line to the lifting surface has been explained by Birnbaum. In the...
Topics: THERMAL CONTROL COATINGS, MODULUS OF ELASTICITY, FRACTURE STRENGTH, ZIRCONIUM OXIDES, YTTRIUM...
A thermal barrier coating composition is provided. The composition has a base oxide, a primary stabilizer, and at least two additional cationic oxide dopants. Preferably, a pair of group A and group B defect cluster-promoting oxides is used in conjunction with the base and primary stabilizer oxides. The new thermal barrier coating is found to have significantly lower thermal conductivity and better sintering resistance. In preferred embodiments, the base oxide is selected from zirconia and...
Topics: NASA Technical Reports Server (NTRS), THERMAL CONTROL COATINGS, LOW CONDUCTIVITY, PATENTS, Zhu,...
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214
May 30, 2011
05/11
by
Lyle, Karen H.; Bark, Lindley W.; Jackson, Karen E
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A project has been initiated to improve crash test and analysis correlation. The work in this paper concentrated on the test and simulation results for a fuselage section. Two drop tests of the section were conducted. The first test was designed to excite the linear structural response for comparison with finite element modal analysis results. The second test was designed to provide data for correlation with crash simulations. An MSC.Dytran model was developed to generate nonlinear transient...
Topics: SPECTROSCOPY, CARBON DIOXIDE, MARKERS, THERMAL CONTROL COATINGS, SPALLATION, THERMAL BARRIERS...
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299
Jul 9, 2010
07/10
by
GOUET, M
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THE IMPORTANCE OF VISUAL AIDS IN AIRPORT GROUND LIGHTING EQUIPMENT IS DISCUSSED IN TERMS OF LOWER OPERATIONAL STANDARDS. DIFFERENT TYPES OF LIGHT BEACONING DEVICES ARE PRESENTED ALONG WITH THE EFFECTS OF THE LOWERING OF MINIMUMS ON AIRCRAFT GUIDANCE AND LANDING. THE LIGHTING EQUIPMENT USED IN FRANCE IS ALSO DESCRIBED.
Topics: OPTICAL PROPERTIES, RADIATION ABSORPTION, SALT SPRAY TESTS, THERMAL CONTROL COATINGS, MARINE...
A thermal barrier coating composition is provided. The composition has a base oxide, a primary stabilizer, and at least two additional cationic oxide dopants. Preferably, a pair of group A and group B defect cluster-promoting oxides is used in conjunction with the base and primary stabilizer oxides. The new thermal barrier coating is found to have significantly lower thermal conductivity and better sintering resistance. In preferred embodiments, the base oxide is selected from zirconia and...
Topics: NASA Technical Reports Server (NTRS), LOW CONDUCTIVITY, SINTERING, THERMAL CONTROL COATINGS,...
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354
Jul 9, 2010
07/10
by
HUTTER, U
texts
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IN INSTALLING GROUPS OF WINDMILL GENERATORS TO PRODUCE ELECTRIC POWER FROM THE FORCE OF THE WIND, IT IS IMPORTANT TO LOCATE THE UNITS OF SUCH A NETWORK IN SUCH FASHION THAT THE SO-CALLED TWO-MINUTE VARIATION OF THE WIND VELOCITY CAN BE OVERCOME. THIS IS DONE BY USING AT LEAST THREE WINDMILL GENERATORS LOCATED AN APPROPRIATE DISTANCE APART. WHEN THE WIND VELOCITY IS INSUFFICIENTLY GREAT TO DRIVE THE BLADES OF THE WINDMILLS, A SOURCE OF POWER SHOULD BE AVAILABLE (BATTERY, POWER FROM OTHER...
Topics: ABLATIVE MATERIALS, CERAMIC COATINGS, HEAT SHIELDING, SPACE ENVIRONMENT SIMULATION, COMPOSITE...
Thin coating of high-temperature epoxy resin provides necessary electrical insulation, as well as good thermal conductivity between battery cells. Insulation increases efficiency of nickel-cadmium battery, as it would any multicell battery assembly in which cell-to-cell thermal balance is critical.
Topics: NASA Technical Reports Server (NTRS), ELECTRIC BATTERIES, ELECTROCHEMICAL CELLS, EPOXY RESINS,...
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431
Jun 26, 2011
06/11
by
NON
texts
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A check valve which closes more rapidly to prevent wearing of the valve seat and of the valve member that seals thereagainst, including a solenoid or other actuator that aids the normal spring to quickly close the valve at approximately the time when downpath fluid flow would stop, the actuator then being deenergized. The control circuit that operates the actuator can include a pair of pressure sensors sensing pressure both upstream and downstream from the valve seat. Where the valve is...
Topics: COMBUSTION CHAMBERS, PROTECTIVE COATINGS, PULSE DETONATION ENGINES, THERMAL CONTROL COATINGS,...
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227
May 23, 2011
05/11
by
Dickerson, Steve L.; Smith, Virgil; White, Thoma
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This progress report is for the Predoctoral Design Training Program at Georgia Institute of Technology for the period 31 August 1969 to 31 August 1970. Projects include interurban air transportation, solid waste collection and disposal, and environmental health.
Topics: ALUMINUM OXIDES, INFRARED RADIATION, SUBSTRATES, TEMPERATURE GRADIENTS, TEMPERATURE MEASUREMENT,...
MesoCoat Inc., of Euclid, Ohio, collaborated with Glenn Research Center to provide thermal barrier coating (TBC) technology, developed by Glenn researcher Dongming Zhu, to enhance the lifespan and performance of engines in U.S. Air Force legacy aircraft. The TBC reduces thermal stresses on engine parts, increasing component life by 50 percent. MesoCoat is also producing metal cladding technology that may soon provide similar life-lengthening benefits for the Nation's infrastructure. Through a...
Topics: NASA Technical Reports Server (NTRS), CLADDING, COATING, ENGINE PARTS, THERMAL CONTROL COATINGS,...
A thermal barrier coating composition comprising a base oxide, a primary stabilizer oxide, and at least one dopant oxide is disclosed. Preferably, a pair of group A and group B defect cluster-promoting oxides is used in conjunction with the base and primary stabilizer oxides. The new thermal barrier coating is found to have significantly lower thermal conductivity and better sintering resistance. The base oxide is selected from the group consisting of zirconia and hafnia and combinations...
Topics: NASA Technical Reports Server (NTRS), LOW CONDUCTIVITY, OXIDES, SINTERING, THERMAL CONTROL...
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311
Jun 13, 2011
06/11
by
Adams, Constance; Andersson, Ingvar; Feighery, Joh
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At the United Nations Millennium Summit in September of 2000, the world leaders agreed on an ambitious agenda for reducing poverty and improving lives: the Millennium Development Goals (MDGs) , a list of issues they consider highly pernicious, threatening to human welfare and, thereby, to global security and prosperity. Among the eight goals are included fundamental human needs such as the eradication of extreme poverty and hunger, the promotion of gender equality, the reduction of child...
Topics: CERAMIC MATRIX COMPOSITES, DURABILITY, COATING, FINITE ELEMENT METHOD, SINTERING, PROTECTIVE...
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272
May 31, 2011
05/11
by
Martin, Lynne; Villeda, Eric; Orasanu, Judit
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In a study of CRM LOFT briefings published in 1997, Dismukes, McDonnell & Jobe reported that briefings were not being utilized as fully as they could be and that crews may not be getting the full benefit from LOFT that is possible. On the basis of their findings, they suggested a set of general guidelines for briefings for the industry. Our work builds on this study to try to provide a specific debriefing tool which provides a focus for the strategies that Dismukes et al suggest.
Topics: THERMAL CONTROL COATINGS, HIGH TEMPERATURE GASES, CERAMICS, THERMAL RADIATION, CONDUCTIVITY,...
A bond coat composition for use in thermal barrier coatings comprises a NiAl--CoCrAlY matrix containing particles of AlN dispersed therein. The bond coat composition is prepared by croymilling NiAl and CoCrAlY in liquid nitrogen.
Topics: NASA Technical Reports Server (NTRS), ALLOYS, OXIDATION, THERMAL CONTROL COATINGS, THERMAL...
Silicone elastomer is placed in evacuating system, heated to 160 C and held at this temperature for 24 hours. Elastomer is then cooled to room temperature in vacuum, producing upgraded, low outgassing polymer of increased molecular weight.
Topics: NASA Technical Reports Server (NTRS), ADHESIVES, EPOXY RESINS, SEALERS, SILICONE RUBBER, THERMAL...
A parametric study was undertaken to examine the effects of scattering on the combined reflection and thermal radiation emission of a typical semi-transparent thermal barrier coating material. A one dimensional model was used.
Topics: NASA Technical Reports Server (NTRS), THERMAL CONTROL COATINGS, SCATTERING, THERMAL RADIATION, HEAT...
The concept of introducing organic agents into silicone resins to stabilize these materials against the ravages of ultraviolet radiation is presented. A screening of coating materials, cover materials and ultraviolet screening agents is described. Fabrication processes were developed for the application of thin 25 micrometer coatings to Teflon. Temperature shock and temperature-humidity tests were conducted.
Topics: NASA Technical Reports Server (NTRS), ADHESIVE BONDING, SOLAR CELLS, TEFLON (TRADEMARK),...
The successful thermal design of spacecraft depends in part on a knowledge of the solar absorption and hemispherical emittance of the thermal control coatings used in and on the spacecraft. Goddard Space Flight Center has had since its beginning a group whose mission has been to provide thermal/optical properties data of thermal control coatings to thermal engineers. This handbook represents a summary of the data and knowledge accumulated over many years at GSFC.
Topics: NASA Technical Reports Server (NTRS), SATELLITE TEMPERATURE, SPACECRAFT ENVIRONMENTS, THERMAL...
The composition and evaporation rate of the outgassing of a space vehicle thermal control paint as a function of temperature were studied. A contamination chamber was designed, constructed, and tested. Samples of thermal control paint were tested to determine if heating to moderate temperatures causes them to release outgassing products which can be collected on a cooled cesium iodide window for identification by IR analysis. Results showed that outgassing of surfaces other than the sample was...
Topics: NASA Technical Reports Server (NTRS), AEROSPACE ENVIRONMENTS, OUTGASSING, THERMAL CONTROL COATINGS,...
An article comprises a silicon-containing substrate and an external environmental/thermal barrier coating. The external environmental/thermal barrier coating is permeable to diffusion of an environmental oxidant and the silicon-containing substrate is oxidizable by reaction with oxidant to form at least one gaseous product. The article comprises an intermediate layer/coating between the silicon-containing substrate and the environmental/thermal barrier coating that is oxidizable to a nongaseous...
Topics: NASA Technical Reports Server (NTRS), CERAMICS, OXYGEN, REACTIVITY, SILICON, SUBSTRATES, THERMAL...
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May 29, 2011
05/11
by
Statman, Joseph I
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The National Aeronautics and Space Administration (NASA) supports unmanned space missions through a Deep Space Network (DSN) that is developed and operated by the Jet Propulsion Laboratory (JPL and its subcontractors. The DSN capabilities have been incrementally upgraded since its establishment in the late '50s and are delivered from three Deep Space Communications Complexes (DSCC's) near Goldstone, California, Madrid, Spain, and Canberra, Australia. At present each DSCC includes large antennas...
Topics: THIN FILMS, POLISHING, METAL FILMS, SOLAR ENERGY ABSORBERS, PROTECTIVE COATINGS, LACQUERS, METAL...
A simple, two-layer plasma-sprayed thermal barrier coating system was developed which has the potential for protecting high temperature air-cooled gas turbine components. Of those coatings initially examined, the most promising system consisted of a Ni-16Cr-6Al-0.6Y (in wt%) thermal barrier coating (about 0.005 to 0.010 cm thick) and a ZrO2-12Y2O3 (in wt%) thermal barrier coating (about 0.025 to 0.064 cm thick). This thermal barrier substantially lowered the metal temperature of an air-cooled...
Topics: NASA Technical Reports Server (NTRS), AIRFOILS, GAS TURBINES, PROTECTIVE COATINGS, THERMAL CONTROL...
It has been reported that erroneous results were obtained when a conventional pyrometer was used to measure the surface temperature of turbine engine components. Temperatures discrepancies were observed in components which were identical, except that one had its measured surface covered by a nanostructured thermal barrier coating (TBC) whereas the other component's surface was not so coated. These components were placed in an identical environment, receiving identical heat fluxes. A pyrometer...
Topics: NASA Technical Reports Server (NTRS), TEMPERATURE MEASUREMENT, PYROMETERS, SURFACE TEMPERATURE,...
Application of thermal barrier coatings deposited by thermal spray, physical vapor and possibly other methods is expected to be extended from aircraft gas turbines to industrial and utility gas turbines as well as diesel engines. This increased usage implies the participation of greater numbers of processors and users, making the availability of standards for process control and property measurement more important. Available standards for processing and evaluation of thermal barrier coatings...
Topics: NASA Technical Reports Server (NTRS), SPRAYING, THERMAL CONTROL COATINGS, VAPOR DEPOSITION,...
A high-purity, fused-silica reflecting heat shield for the thermal protection of outer-planet probes was developed. Factors that strongly influence the performance of a silica heat shield were studied. Silica-bonded silica configurations, each prepared by a different technique, were investigated and rated according to its relative merits. Slip-casting was selected as the preferred fabrication method because it produced good reflectivity and good strength, and is relatively easy to scale up for...
Topics: NASA Technical Reports Server (NTRS), HEAT SHIELDING, SILICON DIOXIDE, ATMOSPHERIC ENTRY, SLIP...
An analytical investigation of present and advanced gas turbine power generation cycles incorporating thermal barrier turbine component coatings was performed. Approximately 50 parametric points considering simple, recuperated, and combined cycles (including gasification) with gas turbine inlet temperatures from current levels through 1644K (2500 F) were evaluated. The results indicated that thermal barriers would be an attractive means to improve performance and reduce cost of electricity for...
Topics: NASA Technical Reports Server (NTRS), CYCLES, GAS TURBINE ENGINES, THERMAL CONTROL COATINGS, COST...
A cylindrical-punch indentation technique has been developed as a means of measuring the nonlinear elastic responses of materials -- more specifically, for measuring the moduli of elasticity of materials in cases in which these moduli vary with applied loads. This technique offers no advantage for characterizing materials that exhibit purely linear elastic responses (constant moduli of elasticity, independent of applied loads). However, the technique offers a significant advantage for...
Topics: NASA Technical Reports Server (NTRS), INDENTATION, MODULUS OF ELASTICITY, NONLINEARITY, MECHANICAL...
Thermal barrier coatings will be more aggressively designed to protect gas turbine engine hot-section components in order to meet future engine higher fuel efficiency and lower emission goals. In this presentation, thermal barrier coating development considerations and requirements will be discussed. An experimental approach is established to monitor in real time the thermal conductivity of the coating systems subjected to high-heat-flux, steady-state and cyclic temperature gradients. Advanced...
Topics: NASA Technical Reports Server (NTRS), THERMAL CONTROL COATINGS, THERMAL CONDUCTIVITY, CORROSION...
Ceramic thermal and environmental barrier coatings (T/EBCs) that contain multiple layers of alternating chemical composition have been developed as improved means of protecting underlying components of gas-turbine and other heat engines against both corrosive combustion gases and high temperatures.
Topics: NASA Technical Reports Server (NTRS), CERAMIC COATINGS, HIGH TEMPERATURE, THERMAL CONTROL COATINGS,...
