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Relevant bibliographies by topics / Platinum Aluminide

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Academic literature on the topic 'Platinum Aluminide'

Author: Grafiati

Published: 6 September 2023

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Journal articles on the topic "Platinum Aluminide"

1

McMinn, A., R. Viswanathan, and C. L. Knauf. "Field Evaluation of Gas Turbine Protective Coatings." Journal of Engineering for Gas Turbines and Power 110, no. 1 (January 1, 1988): 142–49. http://dx.doi.org/10.1115/1.3240077.

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The hot corrosion resistance of several protective coatings that had been applied to MAR-M-509 nozzle guide vanes and exposed in a utility gas turbine has been evaluated. The coatings included basic aluminide, rhodium-aluminide, platinum-rhodium-aluminide, and palladium-aluminide diffusion coatings, and cobalt-chromium-aluminum-yttrium (CoCrAlY) and ceramic overlay coatings. A combination of metallographic examination of vane cross sections and energy dispersive X-ray analysis (EDS) was employed in the evaluation. The results showed that none of the coatings was totally resistant to corrosive attack. The CoCrAlY and platinum-rhodium-aluminide coatings exhibited the greatest resistance to hot corrosion. The CoCrAlY coated vanes were, however, susceptible to thermal fatigue cracking. Except for the poor performance of the palladium-aluminide coating, the precious metal aluminides offered the best protection against corrosion. Hot isostatically pressing coatings was not found to be beneficial, and in one case appeared detrimental.

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Hong, Seok Jun, Jae Woong Choi, Gil Ho Hwang, Won Kyu Han, Joon Shik Park, and Sung Goon Kang. "Effect of the Palladium Mid-Layer on the Cyclic Oxidation of Platinum Aluminide Bond Coating." Materials Science Forum 510-511 (March 2006): 1058–61. http://dx.doi.org/10.4028/www.scientific.net/msf.510-511.1058.

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Platinum/Palladium modified aluminide coatings prepared by aluminide pack cementation on the nickel base superalloy Inconnel 738. The platinum/palladium modified aluminide coating of cyclic oxidation behavior at 1200°C was investigated by TGA, XRD and SEM/EDS. Platinum/Palladium modified aluminide coatings showed better cyclic oxidation resistance than Platinum modified aluminide coating and palladium modified aluminide coating compared. Pt and Pd alloy played an enough role in alumina stabilization and in delaying the degradation of β-phase.

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Zagula-Yavorska, M., and J. Romanowska. "The effect of precious metals in the NiAl coating on the oxidation resistance of the Inconel 713 superalloy." Journal of Mining and Metallurgy, Section B: Metallurgy, no. 00 (2022): 11. http://dx.doi.org/10.2298/jmmb220427011z.

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The rhodium incorporated aluminide coating was produced by the rhodium electroplating (0.5 ?m thick layer) followed by the chemical vapor deposition process on the Inconel 713 superalloy. This coating is composed of the ?-NiAl phase. A part of nickel atoms is replaced by rhodium atoms in the ?-NiAl phase. The plain, rhodium and platinum incorporated aluminide coatings were oxidized at 1100?C under the atmospheric pressure. The oxidation kinetics of the rhodium and platinum incorporated aluminide coatings are similar, but different than oxidation kinetic of the plain coating. The ?-Al2O3 is the main product both in rhodium and platinum modified coatings after 360 h of oxidation. Moreover, the ?-Ni3Al phase, besides the ?-NiAl phase, was identified. The presence of 4 at. % rhodium in the coating provides similar oxidation resistance as the presence of 10-20 at. % platinum. Both rhodium and platinum incorporated aluminide coatings produced by the chemical vapor deposition process offer good oxidation protection of the Inconel 713 superalloy.

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Cheruvu, N. S., K. S. Chan, and G. R. Leverant. "Cyclic Oxidation Behavior of Aluminide, Platinum Modified Aluminide, and MCrAlY Coatings on GTD-111." Journal of Engineering for Gas Turbines and Power 122, no. 1 (October 20, 1999): 50–54. http://dx.doi.org/10.1115/1.483174.

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Cyclic oxidation behavior of aluminide, platinum modified aluminide, and MCrAlY coatings has been investigated at three temperatures. Aluminide and platinum modified coatings were deposited on GTD 111 material using an outward diffusion process. CoCrAlY coating was applied on GTD-111 by Electron Beam Physical Vapor Deposition (EB-PVD). The oxidation behavior of these coatings is characterized by weight change measurements and by the variation of β phase present in the coating. The platinum modified aluminide coating exhibited the highest resistance to oxide scale spallation (weight loss) during cyclic oxidation testing. Metallographic techniques were used to determine the amount of β phase and the aluminum content in a coating as a function of cycles. Cyclic oxidation life of these coatings is discussed in terms of the residual β and aluminum content present in the coating after exposure. These results have been used to calibrate and validate a coating life model (COATLIFE) developed at the Material Center for Combustion Turbines (MCCT). [S0742-4795(00)00801-2]

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Yavorska, M., Jan Sieniawski, Ryszard Filip, and Tadeusz Gancarczyk. "Microstructure Investigation of Aluminide Coatings after Platinum Modification Deposited by CVD Method on Inconel 713 LC Ni-Base Superalloy." Advanced Materials Research 409 (November 2011): 883–88. http://dx.doi.org/10.4028/www.scientific.net/amr.409.883.

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In the present study, microstructure investigation of aluminide coatings after platinum modification deposited by CVD method on Inconel 713 LC Ni-base superalloys were performed. The platinum coatings 3 and 7 m thick were deposited by electroplating process. The diffusion treatment of platinum electroplating coatings at the temperature 1050 °C was carried out for 2h. The low-activity CVD aluminizing of heat treated coatings at the temperature 1050 °C was conducted for 8 h. On the grounds of the obtained results it was found that microstructure of diffusion treated platinum electroplating coatings 3 m and 7 m thick consisted of two phases: γ-Ni and (Al0.25Pt0.75)Ni3. The low activity CVD aluminizing of diffusion treated platinum electroplating coatings 3 and 7 m thick enables the diffusion coating obtaining. The main constituent of aluminide coatings was (Ni,Pt)Al phase.

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Tawancy, H. M., N. M. Abbas, and T. N. Rhys-Jones. "Role of platinum in aluminide coatings." Surface and Coatings Technology 49, no. 1-3 (December 1991): 1–7. http://dx.doi.org/10.1016/0257-8972(91)90022-o.

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7

Boone, D. H., P. Deb, L. I. Purvis, and D. V. Rigney. "Surface morphology of platinum modified aluminide coatings." Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films 3, no. 6 (November 1985): 2557–63. http://dx.doi.org/10.1116/1.572833.

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Xue, B., and H. Schwer. "Crystal structure of cerium platinum aluminide, CePtAl." Journal of Alloys and Compounds 204, no. 1-2 (February 1994): L25—L26. http://dx.doi.org/10.1016/0925-8388(94)90061-2.

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Romanowska, Jolanta, Maryana Zagula-Yavorska, and Łukasz Kolek. "Oxidation Resistance of Modified Aluminide Coatings." MATEC Web of Conferences 253 (2019): 03006. http://dx.doi.org/10.1051/matecconf/201925303006.

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The application of protective aluminide coatings is an effective way to increase the oxidation resistance of the treated parts and prolongs their lifetime. The addition of small amount of noble metals (platinum or palladium) or reactive elements such as: hafnium, zirconium, yttrium and cerium has a beneficial effect on oxidation behavior. This beneficial effect includes an improvement of adhesion of alumina scales and reduction of oxide scale growth rate. Platinum and hafnium or zirconium modified aluminide coating were deposited on pure nickel using the electroplating and CVD methods. The coatings consisted of two layers: an outer, β-NiAl phase and the interdiffusion γ’-Ni3Al phase. Palladium dissolved in the whole coating, whereas hafnium and zirconium formed inclusions on the border of the layers. Samples were subjected to cyclic oxidation test at 1100 °C for 200h. Oxidation resistance of the palladium, Hf+Pd and Zr+Pd modified coatings deposited on pure nickel does not differ significantly, but is better than the oxidation resistance of the non-modified one.

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Kircher, T. A., B. G. McMordie, and K. Richards. "Use of experimental designs to evaluate formation of aluminide and platinum aluminide coatings." Surface and Coatings Technology 108-109 (October 1998): 24–29. http://dx.doi.org/10.1016/s0257-8972(98)00664-1.

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Dissertations / Theses on the topic "Platinum Aluminide"

1

Ooi, Thian Ngan. "High temperature oxidation of platinum aluminide coated CMSX-4." Thesis, Imperial College London, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.444569.

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Encinas-Oropesa, Adriana. "Study of hot corrosion of single crystal superalloys and platinum-aluminide coatings." Thesis, Cranfield University, 2005. http://dspace.lib.cranfield.ac.uk/handle/1826/4519.

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At the present time, combined cycle systems for power generation (e. g. IGCC), offer increased efficiency of power generation and lower environmental emissions, specifically C02, SOx, and NOx, as well as being adaptable to most fossil fuels. Economic factors, such as the cost of the materials must be considered. Materials influence the service lifetime in the required operational environment. Solid fuels like coal and biomass produce different combustion environments containing a range of contaminants that, when they reach their melting points, may cause accelerated corrosion, affecting directly the service life time of the gas turbine constructional materials. This accelerated corrosion is known as Hot Corrosion. The aim of this study was to develop, an understanding of the influence of these environmental factors on rate of hot corrosion of modem turbine materials, i. e. the single crystal alloys CMSX4 the SC2 , both uncoated and PtAl coated that are needed for a gas turbine blade and vanes operating in a range of hot corrosion environments expected in an lGCC plant. To achieve this aim, a series of laboratory corrosion tests was planned to simulate the same corrosion environment as in industrial high temperature gas turbine operation. Following established procedures for corrosion testing, samples were exposed in a controlled atmosphere furnace to a mix of gases (air/SO241CI) with a cyclic exposure time of 50 and/or 100h duration. Each cycle, samples were removed to be recoated with an alkali salt mixture to a total exposure time of 500h and or 1000h. Cross sections were examined by SEM/EDX to identify the mode of hot corrosion attack. To quantify the rate of corrosion, samples were measured pre-exposure and post-exposure, and this corrosion data was statistically assessed. Finally, from this quantitative data, life prediction models were developed to describe/predict the onset of hot corrosion and the corrosion rates observed under different gas compositions, and various deposition fluxes, both at typical type I and type II hot corrosion temperatures in terms of incubation and propagation periods. Separate models have been developed for the two single crystals superalloys: CMSX4 and SC2, in both the uncoated and platinum aluminide coated condition. The goodness of fit as defined by the regression coefficient varies from 0.88 to 0.99 for the propagation models at 700 and 900°C. The incubation models are as precise at 7001C but less precise at 9001C with regression coefficients of 0.78-0.94. I

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McCloskey, Margaret Ann. "Plastic instability of platinum modified and unmodified aluminide coatings during 1100 C cyclic testing." Thesis, Monterey, California: U.S. Naval Postgraduate School, 1987. http://hdl.handle.net/10945/22420.

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Malush, Rudolph E. "An investigation of the hot corrosion protectivity behavior of platinum modified aluminide coatings on nickel-based superalloys." Thesis, Monterey, California: U.S. Naval Postgraduate School, 1987. http://hdl.handle.net/10945/22321.

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Malinga, Nduduzo Nkanyiso. "Photophysicochemical properties of aluminium phthalocyanine-platinum conjugates." Thesis, Rhodes University, 2013. http://hdl.handle.net/10962/d1002954.

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The combination of chemotherapy and photodynamic therapy was investigated by synthesis and characterization of octacarboxy phthalocyanine covalent conjugates with platinum complexes. This work presents the synthesis, characterization and photophysicochemical properties of aluminium (diaquaplatinum) octacarboxyphthalocyanine and aluminium (diammine) octacarboxyphthalocyanine. The conjugates were prepared by conjugating aluminium octacarboxy phthalocyanine with potassium tetrachloro platinate to yield aluminium tetrakis and trikis (diaquaplatinum) octacarboxy phthalocyanine. The aluminium octacarboxy phthalocyanine was also conjugated with cis-diamminedichloroplatinum to yield aluminium bis and tris (diaquaplatinum) octacarboxy phthalocyanine. From the characterization of the conjugates it was discovered that the aluminium (diaquaplatinum) octacarboxy phthalocyanine had formed platinum nanoparticles with the Pc acting as a capping agent. The triplet lifetimes decreased with the increasing number of platinum complexesconjugated to the Pc. The heavy atom effect improved the overall photophysicochemical properties.

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Gremion, Carine. "Elaboration et caractérisation d'absorbeurs sélectifs platine-alumine pour le solaire thermique à concentration à haute température." Thesis, Ecully, Ecole centrale de Lyon, 2015. http://www.theses.fr/2015ECDL0043/document.

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Le développement de nouveaux matériaux pour les absorbeurs sélectifs pour le solaire thermique à concentration est une étape importante dans le déploiement des énergies renouvelables. La température actuelle de fonctionnement de ces absorbeurs (autour de 450°C) doit être augmentée jusqu’à 650°C ou plus, pour rendre cette technologie rentable. Dans ce but, de nouveaux matériaux pour les absorbeurs solaires doivent être développés, pour résister à ces températures sur le long terme, sans dégradation de leurs propriétés d’absorption. Les matériaux composites en couches minces sont des alternatives prometteuses aux matériaux existants, particulièrement les multicouches platine-alumine qui présentent une grande résistance en température et à l’oxydation. Le sujet de cette thèse a pour but de développer un matériau présentant une bonne absorption de l’énergie solaire et d’étudier les mécanismes de vieillissement qui interviennent dans ce matériau à haute température (650°C) sous air. Pour cela, nous nous sommes donc intéressés aux composites de platine et d’alumine. L’utilisation de simulations numériques a permis de développer une structure dont les propriétés optiques ont été optimisées. Ces structures ont ensuite été réalisées par pulvérisation cathodique magnétron et leurs propriétés optiques mesurées pour vérifier la sélectivité des absorbeurs obtenus. Des valeurs d’absorption de α=0.95 et d’émissivité de ε=0.18 ont été obtenues. Par la suite, notre étude a porté sur les différents mécanismes qui interviennent lors du vieillissement, notamment l’impact du substrat, et les parades pouvant être mises en place pour ralentir ce vieillissement
Developing new absorber material for solar thermal power is a key step in the enhancement of renewable energies. The current working temperature of the absorber in power plant is too low (450°C) and must be raised to at least 650°C to enhance the yield of the plant. New absorber materials must be developed, to resist such high temperatures for many years, without losing their optical selectivity. Multilayer composite materials show promising results, especially platinum-alumina multilayer because of their good thermal stability. The aim of this PhD was to develop an absorber presenting a good solar absorption and to study the degradation mechanisms taking place during the aging at 650°C in air. Therefore, we studied the platinum-alumina multilayer. We used optical simulation to optimize the structure of our absorber. Then we realized these structures by magnetron sputtering and we performed optical characterizations to verify the optical selectivity. Values of absorption and emissivity of α=0.95 and ε=0.18 were obtained. At that point, we performed aging tests on our absorbers to study the degradation mechanisms taking place during aging at 650°C and to find ways to avoid those degradations in future applications

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Mager-Maury, Christophe. "Etude théorique de l'effet des propriétés acido-basiques de l'alumine-gamma sur la réactivité de nano-agrégats métalliques." Phd thesis, Ecole normale supérieure de lyon - ENS LYON, 2011. http://tel.archives-ouvertes.fr/tel-00682734.

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L'objectif de ce travail de thèse est la compréhension de l'impact des propriétés acido-basiques des supports oxydes sur l'interaction métal-support ainsi que les effets du milieu réactionnel sur les propriétés structurales, électroniques, thermodynamique et réactives des catalyseurs métalliques hyper-dispersés. Le catalyseur modèle choisi est un agrégat monométallique de platine déposé sur alumine qui est la référence des études fondamentales pour permettre des progrès dans la compréhension de ce système complexe. La mise en œuvre de calculs dans le formalisme de la théorie de la fonctionnelle de la densité, réalisés à partir de modèles moléculaires périodiques, a permis de déterminer l'état de surface du catalyseur pour des conditions de température et de pression représentatifs de l'expérience. L'influence de la taille des particules conjointement à la présence de chlore sur la stabilité thermodynamique des agrégats de Pt supportés sur alumine-γ a démontré une stabilisation significative des agrégats Pt3 lors de la migration d'espèces de surface (H, OH et Cl) sur la particule. La reconstruction d'une morphologie biplanaire (la plus stable en absence d'hydrogène) vers une morphologie cuboctaédrique pour les forts taux de recouvrement en hydrogène sur les particules de Pt supportées a été démontrée et permet d'expliquer plusieurs observations expérimentales encore mal comprises. L'impact du milieu réactionnel sur la rupture C-C et C-H à partir de l'éthane sur l'agrégat Pt13 supporté sur alumine- γ a été démontré. Les résultats obtenus permettent de mieux comprendre l'importance des conditions de température et de pression du milieu réactionnel (notamment du rapport P(H2)/P(C2H6)) sur la stabilité des intermédiaires réactionnels. Ces résultats sont en accord avec les observations expérimentales et permettent de mettre en évidence que l'optimum de pression en hydrogène est relativement élevé dans le cas des réactions de reforming catalysées par du Pt seul.

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Petchpong, P. "Quantitative impurities effects on temperatures of tin and aluminium fixed-point cells." Thesis, Brunel University, 2009. http://bura.brunel.ac.uk/handle/2438/3984.

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The International Temperature Scale of 1990 (ITS-90) defines the present S.I.(“System International”) means of measuring temperature. The ITS-90 uses the freezing points of metals to define temperature fixed points. It also uses long-stemplatinum resistance thermometers to interpolate between the fixed points from 660 °Cdown to 84 K (if one includes the Argon triple point). Impurities are a major source of uncertainty in the fixed point temperature (of the order of 1 mK). And a better understanding of the impurity effect is required to improve top-level metrologicalthermometry. Most historical experiments with impurities have worked at a muchhigher levels of impurities – say of the order of 100ppm - and in arrangements that are not used on a day-to-day basis in a metrology laboratory. This thesis describes the deliberate doping of tin and aluminium, each with three different impurities and the effects of these on the temperature of the tin and aluminium liquid-solid phase transitions. The impurities, of the order of 1-30 ppm,were Co, Pb and Sb in the tin and Cu, Si and Ti in the aluminium. The tin and aluminium samples were in the form of ~0.3 kg ingots that would normally be used to realise an ITS-90 fixed point. Measurements were made using equipment normally available in a metrological thermometry laboratory, rather than using specially prepared samples. The samples were chemically analysed (by Glow Discharge Mass Spectrometry(GD-MS)) before and after the doping. Using the amount of dopants introduced,and/or the chemical analysis data, the measured temperature changes were compared with those interpolated from the standard text. The experimental undoped liquid-solid transition curves were also compared against theoretical curves (calculated from atheoretical model MTDATA). The results obtained did not disagree with the Hansen interpolated values (though there was considerable uncertainty in some of the measurements (e.g. a factor of 2 ormore) due to the measurement of small changes. Within these uncertainties it indicatesthat the Sum of Individual Estimates (SIE) method of correcting for, at least, metal impurities in otherwise high purity metals remain valid. However the results also showed considerable discrepancies between the initial measured and calculated temperature shifts (based on the pre-existing impurities prior to doping) suggesting that there may be impurities that are not (separately) detected by the GD-MS method. There was evidence that the thermal history of the metal phase transitions can cause considerable segregation of some impurities, particularly those likely to increase the phase transition temperature through a peritectic (“positive” impurities), and that the effects of this segregation can be clearly seen on the shape of the melting curves of thetin doped with Sb. Some of the aluminium doped with Ti freezing curves may also show evidence of a“concave up” shape at the start of the freezing curve, as previously calculated by MTDATA, though the effect is not as pronounced. All individual phase transition measurements - made over tens of hours – were repeated at least three times and found to be reproducible, hence providing a real dataset that can be used for comparison with theoretical models still under development.

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Bahloul, Djamila. "Influence des conditions d'activation sur les proprietes catalytiques du platine depose sur alumine." Poitiers, 1987. http://www.theses.fr/1987POIT2258.

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Turner, Michael. "Brush plating of bearing alloys on aluminium alloy shells." Thesis, Aston University, 1986. http://publications.aston.ac.uk/11919/.

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The turbocharging of diesel engines has led to increase in temperature, load and corrosive attack of plain bearings. To meet these requirements, overlay plated aluminium alloys are now preferred. Currently, lead-tin alloys are deposited using a zincate layer and nickel strike, as intermediate stages in the process. The nickel has undesirable seizure characteristics and the zincate can given rise to corrosion problems. Consequently, brush plating allows the possible elimination of these stages and a decrease in process together with greater automation. The effect of mode application, on the formation of zincate films, using film growth weight measurements, potential-time studies, peel adhesion testing and Scanning Electron Microscopy was studied, for both SIC and AS15 aluminium alloys. The direct plating of aluminium was also successfully achieved. The results obtained indicate that generally, although lower adhesion resulted when a brush technique was used, satisfactory adhesion for fatigue testing was achieved. Both lead-tin and tin-cobalt overlays were examined and a study of the parameters governing brush plating were carried out using various electrolytes. An experimentally developed small scale rig, was used to produce overlay plated bearings that were fatigue tested until failure. The bearings were then examined and an analysis of the failure mechanisms undertaken. The results indicated that both alloy systems are of the regular codeposition type. Tin-cobalt overlays were superior to conventional lead-tin overlays and remained in good condition, although the lining (substrate) failed. Brush plated lead-tin was unsatisfactory. Sufficient understanding has now been gained, to enable a larger scale automated plant to be produced. This will allow a further study of the technique to be carried out, on equipment that more closely resembles that of a full scale production process.

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Books on the topic "Platinum Aluminide"

1

Deb, Prabir. Microstructural formation and effects on the performance of platinum modified aluminide coatings. Monterey, Calif: Naval Postgraduate School, 1985.

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2

MacQuarrie, John. Ultrasonic characterization of a platinum aluminide coating on a gas turbine blade. Ottawa: National Library of Canada = Bibliothèque nationale du Canada, 1992.

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McCloskey, Margaret Ann. Plastic instability of platinum modified and unmodified aluminide coatings during 1100 C cyclic testing. Monterey, Calif: Naval Postgraduate School, 1986.

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4

Malush, Rudolph E. An investigation of the hot corrosion protectivity behavior of platinum modified aluminide coatings on nickel-based superalloys. Monterey, Calif: Naval Postgraduate School, 1987.

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Michael, Turner. Brush plating of bearing alloys on aluminium alloy shells. Birmingham: Aston University. Department of Mechanical and Production Engineering, 1986.

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Newman, Lawrence G. Structural property effects for platinum modified aluminide coatings. 1986.

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Farrell, Margaret Shannon. An investigation of the oxide adhesion and growth characteristics on platinum modified aluminide coatings. 1986.

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Manley, Thomas F. II. Plastic instability of aluminide and platinum modified diffusion coatings during 1100 C cyclic testing. 1985.

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Dust, Mark W. Effect of chromium addition to the low temperature hot corrosion resistence of platinum modified aluminide coatings. 1985.

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Book chapters on the topic "Platinum Aluminide"

1

Petrova, Pavleta A., and Krystyna Stiller. "Oxidation and alkali sulphate-induced corrosion of aluminide diffusion coatings with and without platinum*." In Protective Systems for High Temperature Applications EFC 57, 191–99. London: CRC Press, 2023. http://dx.doi.org/10.1201/9781003421498-16.

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Hong, Seok Jun, Jae Woong Choi, Gil Ho Hwang, Won Kyu Han, Joon Shik Park, and Sung Goon Kang. "Effect of the Palladium Mid-Layer on the Cyclic Oxidation of Platinum Aluminide Bond Coating." In Materials Science Forum, 1058–61. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-995-4.1058.

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3

Tawancy, H. M., N. M. Abbas, and T. N. Rhys-Jones. "Role of platinum in aluminide coatings." In Metallurgical Coatings and Thin Films 1991, 1–7. Elsevier, 1991. http://dx.doi.org/10.1016/b978-0-444-89455-7.50008-3.

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ALPÉRINE, S., P. STEINMETZ, A. FRIANT-COSTANTINI, and P. JOSSO. "STRUCTURE AND HIGH TEMPERATURE PERFORMANCE OF VARIOUS PALLADIUM-MODIFIED ALUMINIDE COATINGS: A LOW COST ALTERNATIVE TO PLATINUM ALUMINIDES." In Metallurgical Coatings and Thin Films 1990, 347–58. Elsevier, 1990. http://dx.doi.org/10.1016/b978-1-85166-813-7.50041-3.

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Fisher, G., P. K. Data, J. S. Burnell-Gray, W. Y. Chan, and R. Wing. "An Investigation of the Oxidation Resistance of Platinum Aluminide Coatings Produced by Either High or Low Activity Processes." In High Temperature Surface Engineering, 1–11. CRC Press, 2020. http://dx.doi.org/10.1201/9780367814069-1.

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Evans, John. "Earth: Minerals to Materials." In Elements of a Sustainable World, 78–138. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780198827832.003.0003.

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The periodicity shown by selected elements in the s-, p-, d- and f-blocks in the Periodic Table is considered. The particular elements chosen include those with significant levels of use that can affect greenhouse gas emissions - either up or down. These include lithium, aluminium, silicon, iron, cobalt, platinum, neodymium and uranium. The means of extraction, formation and purification of the solid elements are discussed. The structural chemistry and energetics involved are elaborated, and estimations of the embodied energy of the elements presented. In terms of properties, the basis of magnetic materials is introduced; in terms of process, the concept of exergy is introduced. The large scale structural materials cement and glass are also discussed.

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Boon, B., and H. Weijs. "Local Impact on Aluminium Plating." In Light-Weight Steel and Aluminium Structures, 671–78. Elsevier, 1999. http://dx.doi.org/10.1016/b978-008043014-0/50181-5.

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Jaenicke, Stephan, Gaik Khuan Chuah, and Ping Zhan. "Hydrogen spillover enhanced acidity of aluminium-substituted MCM-41 platinum bifunctional catalysts." In Science and Technology in Catalysis 1998, Proceedings of the Third Tokyo Conference on Advanced Catalytic Science and Technology, 165–70. Elsevier, 1999. http://dx.doi.org/10.1016/s0167-2991(99)80061-5.

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Albort-Ventura, J. "ALUMINIUM PLATING BY SIMPLEX METHOD USING PULSE RECTIFIER CURRENT." In Advances in Surface Treatments, 259–70. Elsevier, 1987. http://dx.doi.org/10.1016/b978-0-08-034923-7.50031-0.

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Tawancy, H. M., N. M. Abbas, and T. N. Rhys-Jones. "Effect of substrate composition on the oxidation behavior of platinum-aluminized nickel-base superalloys." In Metallurgical Coatings and Thin Films 1992, 1–7. Elsevier, 1992. http://dx.doi.org/10.1016/b978-0-444-89900-2.50007-5.

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Conference papers on the topic "Platinum Aluminide"

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Prasad, B. Durga, Sankara N. Sankaran, Karl E. Wiedemann, and David E. Glass. "Platinum Substitutes and Two-Phase-Glass Overlayers as Low Cost Alternatives to Platinum Aluminide Coatings." In ASME 1996 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1996. http://dx.doi.org/10.1115/96-gt-521.

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The feasibility of processing less-expensive alternative coatings to platinum aluminide was examined. Three approaches were followed: 1) enhancement of nickel-aluminide coatings by application of sol-gel derived two-phase-glass (TPG) overlayers, 2) evaluation of TPG coatings on bare IN 738LC, and 3) substitution of Pt with a less expensive platinum group metal (palladium). Accordingly, IN 738LC coupons were tested with several coatings including TPG, aluminide coatings (platinum aluminide, palladium aluminide, and conventional nickel aluminide), and TPG overlayers on the aluminide coatings. Isothermal-oxidation, cyclic-oxidation, and hot-corrosion tests were conducted at 900°C for 500 hours to evaluate the coatings. The results showed that the TPG by itself provided superior protection compared to the platinum-aluminide coatings under both oxidation and hot-corrosion conditions. The TPG coating also showed promise as an overcoat on aluminide coatings.

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Dust, M. W., P. Deb, D. H. Boone, and S. Shankar. "Hot Corrosion Resistance of Chromium Modified Platinum-Aluminide Coating." In ASME 1986 International Gas Turbine Conference and Exhibit. American Society of Mechanical Engineers, 1986. http://dx.doi.org/10.1115/86-gt-291.

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The addition of elements such as Cr or Pt to the diffusion aluminide coatings has been reported to provide increased protectivity under hot corrosion and oxidation environments. Although the structure and corresponding corrosion resistance of Cr or Pt modified aluminides are reasonably understood there is, however, little information available on the combined additions of Cr and Pt or the processing sequences involved. The effects of both Cr and Pt additions to aluminide coatings on the IN-100 nickel-base superalloy substrate under low temperature (700°C) hot corrosion conditions have been studied. In this investigation, it was found that the structure of the Cr modified platinum-aluminide coatings is most dependent on the sequence of modifying element addition which affects the surface composition and resulting LTHC resistance. The optimum Cr-Pt coating is obtained by the Cr-Pt-Al deposition sequence which results in a continuous single PtAl2 phase layer backed up with a high level of Cr at the surface.

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Warnes, Bruce Michael. "Improved Pt Aluminide Coatings Using CVD and Novel Platinum Electroplating." In ASME 1998 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/98-gt-391.

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Chemical vapor deposition (CVD) is an old coating technology, but it was not successfully utilized to aluminize gas turbine hardware until recently (1989). In CVD aluminizing, the use of multiple, independently controlled, low temperature, external, metal halide generators combined with computer control of all process variables gives flexibility and consistent quality that is not possible with any other aluminizing process. It has been shown that harmful coating impurities (such as sulfur and boron etc.) can be transported to a coating from a high temperature aluminum source in the coating chamber during aluminizing. Representative processes include: pack cementation, above the pack, SNECMA, and high activity CVD. In contrast, it has also been demonstrated that CVD low activity aluminizing removes harmful impurities (S, P, B & W etc.) from the coating during deposition. Furthermore, clean, low activity coatings (simple aluminide MDC-210 or platinum modified MDC-150L) have been shown to exhibit superior oxidation resistance compared to similar coatings made by other aluminizing processes. A second significant source of impurities in platinum modified aluminide diffusion coatings is electroplating, that is, plating bath components (S, P, CI, K, Ca etc.) are codeposited with the platinum, and these impurities can have either a beneficial (K&Ca) or a detrimental (S,P&Cl) influence upon the oxidation resistance of the product coating. The results of investigations on the transport of impurities during aluminizing and electroplating, plus the influence of these impurities on oxidation resistance of the product coatings will be presented and discussed.

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Smith, J. S., and D. H. Boone. "Platinum Modified Aluminides-Present Status." In ASME 1990 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1990. http://dx.doi.org/10.1115/90-gt-319.

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Since their development in the early 1970’s, platinum modified aluminide diffusion coatings have been recognized for their superior oxidation and hot corrosion resistance on nickel based superalloys. More recently, advances in gas phase aluminizing have been utilized to afford coating protection to the internal as well as external surfaces of hollow gas turbine airfoils. This paper presents a brief review of the development history of the platinum aluminide coating system and discusses the various coating morphologies observed. The results of recent work in applying the low pressure chemical vapor deposition process for the production of platinum modified aluminide gas phase coatings on gas turbine components are highlighted.

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Warnes, Bruce M., and Leonard M. Hampson. "Extending the Service Life of Gas Turbine Hardware: (I) Laboratory Investigation." In ASME Turbo Expo 2000: Power for Land, Sea, and Air. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/2000-gt-0559.

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The possibility of extending the service life of the high pressure hardware for gas turbine engines using a novel repair procedure was evaluated in a laboratory study. In the laboratory simulation, both high and low activity platinum aluminide overcoatings of a partially stripped platinum aluminide were evaluated and contrasted. The results indicate that a chemically homogenous, relatively uniform thickness, platinum modified coating can be formed by low activity aluminizing on a substrate with surface areas of both bare alloy and partially stripped platinum aluminide coating. Furthermore, the CVD low activity platinum aluminide overcoat considered had better oxidation resistance than the original coating. The experimental program is outlined, plus the results are presented and discussed.

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Cheruvu, N. S., K. S. Chan, and G. R. Leverant. "Cyclic Oxidation Behavior of Aluminide, Platinum Modified Aluminide, and MCrAlY Coatings on GTD-111." In ASME 1998 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/98-gt-468.

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Cyclic oxidation behavior of aluminide, platinum modified aluminide, and MCrAlY coatings has been investigated at three temperatures. Aluminide and platinum modified coatings were deposited on GTD 111 material using an outward diffusion process. CoCrAlY coating was applied on GTD-111 by Electron Beam Physical Vapor Deposition (EB-PVD). The oxidation behavior of these coatings is characterized by weight change measurements and by the variation of β phase present in the coating. The platinum modified aluminide coating exhibited the highest resistance to oxide scale spallation (weight loss) during cyclic oxidation testing. Metallographic techniques were used to determine the amount of β phase and the aluminum content in a coating as a function of cycles. Cyclic oxidation life of these coatings is discussed in terms of the residual β and aluminum content present in the coating after exposure. These results have been used to calibrate and validate a coating life model (COATLIFE) developed at the Material Center for Combustion Turbines (MCCT).

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Walter, Mark, and Hyungjun Kim. "Degradation of the Mechanical Properties of Aluminide Coatings as a Result of Thermal Cycling." In ASME 2000 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/imece2000-2687.

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Abstract Thermal barrier coatings (TBCs) are typically composed of a ceramic top coat, a thermally grown oxide, and an aluminide bond coat. These three layers each have specific roles in protecting super alloy substrates. State-of-the-art TBCs use Zirconia for the ceramic top coat and develop Alumina thermally grown oxide. Although the bond coats almost universally contain aluminides, their composition and processing vary greatly. In this work, a platinum aluminide bond coat system which was processed using an unactivated pack cementation process is studied. This bond coat system was formed on 1 inch diameter CMSX-4 super alloy disks.

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Connor, Jeffrey A. "Evaluation of Simple Aluminide and Platinum Modified Aluminide Coatings on High Pressure Turbine Blades After Factory Engine Testing-Round II." In ASME 1992 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1992. http://dx.doi.org/10.1115/92-gt-140.

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This paper presents results of factory engine testing of simple aluminide and platinum modified aluminide coatings. Simple aluminide coatings were produced using pack cementation processes. Platinum modified aluminide coatings were produced using three aluminiding processes; pack cementation, above-the-pack or out-of-contact processing, and chemical vapor deposition. These coatings were evaluated on both directionally solidified and single crystal nickel base superalloy turbine blades. These high pressure turbine blades were tested in a commercial high bypass turbofan engine operating predominantly in a high temperature oxidation environment. Included in this paper are discussions of coatings phase stability, coating growth due to diffusion during engine operation, comparison of coating performance and assessment of remaining coating life after engine testing.

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Kircher, Thomas A., David Solovei, Joseph H. Steck, and Srinivasan (Shanks) Shankar. "Improved Processing Route for Aluminization of Gas Turbine Components." In ASME Turbo Expo 2000: Power for Land, Sea, and Air. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/2000-gt-0333.

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Pack aluminizing and vapor-phase aluminizing (VPA) are common methods for producing protective coatings on aero and industrial gas turbine hot section components. SermAlcote® slurry aluminization is an alternative to many industrial pack and vapor-phase aluminizing processes. SermAlcote® slurry aluminization processes are designed to meet existing commercial specifications while offering significant improvements in cost, quality and turntime over competitive aluminizing processes. Advantages of this processing route include simplified masking, shorter thermal processing cycles, improved diffusion capacity (no powder, simplified racks), and elimination of powder handling/storage concerns. Unlike conventional slurry aluminizing methods, the SermAlcote® process produces very uniform diffused aluminide coatings over a very wide range of applied slurry amounts. This simplifies the manufacturing process and produces high degree of process repeatability and uniformity. Data and examples are presented in order to describe the characteristics of SermAlcote® slurry aluminization processes for producing aluminide coatings, platinum-modified aluminide coatings, and over-aluminized MCrAlY coatings.

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Conner, Jeffrey A., David A. Moore, and Roger D. Wustman. "Evaluation of Simple Aluminide and Platinum Modified Aluminide Coatings on High Pressure Turbine Blades After Factory Engine Testing." In ASME 1991 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1991. http://dx.doi.org/10.1115/91-gt-379.

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This paper presents results from recent factory engine testing of simple aluminide coatings produced using pack cementation processes and platinum modified aluminide coatings produced using both pack cementation and chemical vapor deposition processes. These coatings were evaluated on DS nickel base superalloy high pressure turbine blades in a commercial high bypass turbofan engine. Operating conditions were such that turbine inlet air contained up to 3 ppb of sodium. Details of the factory engine testing, coating selection and application, and environmental protection provided by the coatings are highlighted. Future testing plans are also presented.

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Reports on the topic "Platinum Aluminide"

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Yanar, N. M., G. H. Meier, and F. S. Pettit. The Effects of Oxidation-Induced Failures on Thermal Barrier Coatings with Platinum Aluminide and NiCoCrAlY Bond Coats. Fort Belvoir, VA: Defense Technical Information Center, December 2001. http://dx.doi.org/10.21236/ada397801.

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