Готові списки джерел за темами / Intermetallic Coatings

Добірка наукової літератури з теми "Intermetallic Coatings"

Автор: Grafiati

Опубліковано: 6 вересня 2023

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Статті в журналах з теми "Intermetallic Coatings"

Deng, Chun Ming, Min Liu, Chang Guang Deng, Hong Liang Dai, and Ke Song Zhou. "Preparation and Characterizations of NiTi Intermetallic Coatings." Advanced Materials Research 291-294 (July 2011): 80–83. http://dx.doi.org/10.4028/www.scientific.net/amr.291-294.80.

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Much attention has been paid to NiTi intermetallic coating for enhancing cavitation erosion resistance property due to its shape memory effect. In this paper two processes were used to deposit NiTi intermetallic coatings. Process 1 was the deposition of NiTi intermetallic coating using warm spray process with NiTi intermetallic powder as feedstock, and solution treatment was subsequently performed. Process 2 was a mixture process of warm spray and laser treatment. Ni-Ti coating was first deposited via warm spray process with Ni-cladding Ti as feedstock, and laser-treatment was performed to realize the alloying of Ni-Ti. The microstructure and phase compositions for NiTi intermetallic coatings were characterized by means of SEM and XRD. The fundamental properties for NiTi intermetallic coatings were also analyzed.

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Chmielewski, Tomasz, Piotr Siwek, Marcin Chmielewski, Anna Piątkowska, Agnieszka Grabias, and Dariusz Golański. "Structure and Selected Properties of Arc Sprayed Coatings Containing In-Situ Fabricated Fe-Al Intermetallic Phases." Metals 8, no. 12 (December 13, 2018): 1059. http://dx.doi.org/10.3390/met8121059.

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The paper presents the results of research on the production by means of arc spraying of composite coatings from the Fe-Al system with participation of in-situ intermetallic phases. The arc spraying process was carried out by simultaneously melting two different electrode wires, aluminum and steel. The aim of the research is to create protective coatings with a composite structure with a significant participation of FexAly as an intermetallic phases reinforcement. The synthesis of intermetallic phases takes place during the (in-situ) spraying process. Currently most coatings involving intermetallic phases are manufactured by different thermal spraying methods using coating materials in the form of prefabricated powders containing intermetallic phases. The obtained results showed the local occurrence of intermetallic phases from the Fe-Al system, and the dominant components of the structure have two phases, aluminum solid solutions in iron and iron in aluminum. The participation of intermetallic phases in the coating is relatively low, but its effect on the properties of the coating material is significant.

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Topic, M., Richard P. Vinci, Zakhelumuzi Khumalo, and C. Mtshali. "Effect of Intermetallics on Pt-Al Surface Coatings Colour." Defect and Diffusion Forum 353 (May 2014): 259–62. http://dx.doi.org/10.4028/www.scientific.net/ddf.353.259.

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We investigated two coatings, Pt:Al and Pt3:Al, deposited onto pure Al substrates. After annealing at 500°C for 2 hours in vacuum, the Pt:Al coating became “matt silver” while the Pt3:Al colour was “old gold”. Although the deposited coatings were relatively smooth, rope-and ridge-like morphologies were observed in the annealed Pt:Al and Pt3:Al coatings, respectively. X-ray diffraction analyses revealed the presence of Al21Pt6and Al2Pt intermetallics in annealed Pt:Al while only the Al2Pt intermetallic phase was observed in the annealed Pt3:Al coatings. RBS spectra showed an increase of coating thickness by four times in the Pt:Al whilst the coating thickness was doubled in the Pt3:Al coatings. The changes to color, surface morphology, and thickness caused by thermal annealing were attributed to the structural characteristics of the most dominant phases.

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Ismailov, M., I. Ablakatov, and I. Alpysbay. "A Study on the Possibilities of Obtaining Intermetallic Coating of Al-Cu and Cu-Zn Systems Deposited on Metal Carrier." Eurasian Chemico-Technological Journal 19, no. 1 (June 19, 2017): 81. http://dx.doi.org/10.18321/ectj506.

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Анотація:

The research aimed at investigating the possibility of obtaining thin intermetallic films, which can be used as thermal control coatings for spacecraft. The coating films build the passive part of the overall thermal control system of a spacecraft, thus they must provide strong adhesion with the carrier material and have high functional characteristics, optical ones in particular. The study concerned issues of synthesis of stable intermetallic phase of Al4Cu9, Al2Cu, Cu5Zn8 on aluminum and copper carriers by magnetron layer-wise sputtering of reagents. They have looked into patterns of emergence of intermetallic coating applying modes of "rapid" and "slow" sputtering of reagents, applying various thicknesses of sputtered layers of reagents, temperature of the carrier, heat treatment of sprayed coatings. Incomplete and complete modes of synthesis of intermetallic coverage have been discovered. Obtained cross-sectional images of coatings, outcomes of microanalyzer scanning of reagent distribution through the thickness of sputtered coatings, microhardness values, optical absorption and emission ratios, unit of electric resistances, adhesion to the carrier. Obtained prototypes of intermetallic thermostatic coatings could be used in "solar reflectors" and "solar absorbers" classes. The results of measurements of optical and strength characteristics revealed that the intermetallic films can be used not only as thermostatic coatings for space technology, but also in general mechanical engineering, due to high-end mechanical properties.

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Ndumia, Joseph Ndiithi, Min Kang, Jinran Lin, Jitao Liu, and Hao Li. "Influence of Heat Treatment on the Microstructure and Wear Properties of Arc-Sprayed FeCrAl/Al Coating." Coatings 12, no. 3 (March 11, 2022): 374. http://dx.doi.org/10.3390/coatings12030374.

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Анотація:

Intermetallic compounds formed during heat treatment of alloy coatings affect the coating structure and properties. In order to determine the phase changes and coating performance, FeCrAl (Fe Bal., Cr 26 wt.%, Al 6 wt.%) and Al (99.9 wt.%) coating was sprayed onto low carbon steel substrates and subsequently heat-treated at different temperatures. The effects of heat treatment on the microstructure, phase composition, tensile bonding strength, microhardness, and wear properties of the coatings were analyzed. The as-sprayed coating had a dense, layered structure with an average porosity of 3.6%. The microhardness of the as-sprayed coating was comprised of hard FeCrAl splats and ductile Al splats with an average microhardness value of 494 HV0.1. The coating at 300 °C had the highest tensile strength of 37.5 MPa. At 500 °C, FeAl intermetallic compounds formed at the phase boundaries due to the diffusion of elements. The coating microhardness and wear resistance were affected by the uniform coating structure and the precipitation of FeAl intermetallic compounds. Compared with the annealed coatings, the as-sprayed coating had the lowest wear rate.

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Chen, Xiao, Chengdi Li, Xiaobo Bai, Hao Liu, Shunjian Xu, and Yao Hu. "Microstructure, Microhardness, Fracture Toughness, and Abrasive Wear of In-Situ Synthesized TiC/Ti-Al Composite Coatings by Cold Spraying Combined with Heat Treatment." Coatings 11, no. 9 (August 27, 2021): 1034. http://dx.doi.org/10.3390/coatings11091034.

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TiAl intermetallic compounds, as a new kind of high-performance light-weight structural material, are widely applied in many fields. Titanium carbide (TiC) as the reinforcing phase could improve the mechanical properties, wear resistance, and heat-resistance stability of TiAl intermetallic compounds. Ti(Al, C) mixture powders were deposited by cold spraying at gas temperature of 250 °C, 450 °C, and 550 °C. Then, Ti(Al, C) coatings were annealed at temperatures of 650 °C for different times and following holding at 1100 °C for 3 h. The microstructure, microhardness, fracture toughness, and abrasive wear of Ti-Al composite coatings were investigated. The research results were that the particle size of mixture powders decreased as the ball milling time prolonging. Ti(Al) solid solution appeared in the mixture powders as the milling time increased to 30 h. The average porosity of the coating sprayed at 550 °C was the lowest (0.85%). The as-sprayed coatings exhibited the same phase compositions with the mixture powders. The coating sprayed at gas temperature of 550 °C has the highest microhardness and the lowest weight loss. Ti-Al intermetallic was in-situ synthesized after annealing at 650 °C. The average porosity of the annealed coating (sprayed at 450 °C) was the lowest. The content of Ti-Al intermetallic compounds of the annealed coating sprayed at 450 °C is the highest. The X-ray diffraction (XRD) analysis results are consistent with the EDS analysis of the annealed coatings after annealing at 650 °C. Ti-Al intermetallic compounds were almost completely formed in the three kinds of the coatings after annealing at 650 °C for 20 h and following holding at 1100 °C for 3 h. TiAl and TiAl3 intermetallic phases were in-situ synthesized in the coatings based on the energy dispersive spectroscopy (EDS) and XRD analysis. TiC was also in situ synthesized in the coatings as the annealing temperature increased to 1100 °C. The annealed coating (sprayed at 450 °C) has the highest microhardness, fracture toughness, and wear resistance properties after annealing at 1100 °C for 3 h.

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Khimukhin, S. N., and Kseniia P. Eremina. "Microstructure Peculiarities of Intermetallic and Composite Coatings." Solid State Phenomena 316 (April 2021): 783–88. http://dx.doi.org/10.4028/www.scientific.net/ssp.316.783.

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Coatings were obtained by the method of electrospark deposition (ESD), using Ni-Al intermetallic alloys, steel having been used as cathodes. The structure of samples preliminarily, coated with nickel aluminides of various phase compositions (NiAl, Ni3Al), was investigated. In addition to the indicated anode materials, a complex alloyed metal matrix alloy obtained by the method of self-propagating high-temperature synthesis, was used. It was established that the coating microstructure consisted of columnar crystallites, vertically oriented to the cathode surface. X-ray microanalysis of the transverse sections showed a change in the composition of crystallites along their height. It was found that the content of the cathode components decreased from the surface of the sample to the upper part of its coating, however, the content of the anode components increased. The revealed regularities indicate the fact that the coating structure obtained at ESD, was formed through the stage of liquid-phase mixing, which explained high coating adheasion. The mechanisms of structure formation of both single-layer and two-layer coatings proved to be identical.

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Dyl, Tomasz Cyryl, Robert Starosta, and Robert Skoblik. "Effect of the Unit Pressure on the Selection Parameters of Intermetallic Coatings NiAl and Ni₃Al after Plastic Working." Solid State Phenomena 165 (June 2010): 19–24. http://dx.doi.org/10.4028/www.scientific.net/ssp.165.19.

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Анотація:

Modern materials on intermetallic matrix are in the scope of research of many scientific – research centers in Poland [1]. Intermetallic systematic alloys containing aluminium have high resistance to oxidation, abrasive corrosion and fatigue as well as heat resistance. That is why they are applied in the production of machine parts used in hard service conditions (internal combustion turbine blades, exhaust valves, turbo-blower rotors) [2]. Intermetallic coatings can be obtained by means of plasma spraying. Thermal spraying technology is widely used due to the possibility of increasing the service properties in surface layers (strength property, tribological, anti-corrosive and decorative property) as well as coating application on machine parts elements, on tools for plastic working (forging moulds busters, piston rods, gear wheels teeth, crank journals, valve seats, and combustion engine cylinders) [3, 4]. NiAl and Ni3Al coatings are characterized by high fatigue resistance, heat resistance and considerable corrosion resistance [5]. Coatings obtained by thermal spraying have high surface roughness. Thus, subsequent plastic treatment is advisable for plasma-sprayed intermetallic coatings. Therefore it is vital to define to what extent the change of unit pressure will influence reduction of surface roughness of intermetallic coatings. For this purpose experimental upsetting research was carried out on C45 steel samples having NiAl and Ni3Al coatings for the following unit pressures p = 500 MPa, p = 800 MPa, p = 1100 MPa.

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Wang, Hong Tao, Guan Jun Yang, Chang Jiu Li, and Cheng Xing Li. "Effect of Annealing Treatment on the Structure and Microhardness of Cold-Sprayed Nanostructured FeAl/WC Composite Coating." Key Engineering Materials 373-374 (March 2008): 73–76. http://dx.doi.org/10.4028/www.scientific.net/kem.373-374.73.

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Nanostructured FeAl/WC intermetallic composite coatings were prepared by cold spaying of the ball-milled powders. The effect of annealing on the coating structure and microhardness was examined. It was found that the nanocrystalline structure of the milled feedstock was retained in the cold sprayed coatings. The FeAl intermetallic phases were formed from the milled Fe(Al) solid solution during the post-spraying annealing at 550oC. The microhardness of the as-sprayed coating was about 680HV0.1 and it decreased a little with increasing the annealing time at 550oC.

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Li, Sheng Shou, Tian Quan Liang, Xian Fang Yang, and Cui Hua Zhao. "Microstructures and Wear Resistance of Iron-Based Protective Coatings by Supersonic Arc Spraying." Applied Mechanics and Materials 670-671 (October 2014): 554–59. http://dx.doi.org/10.4028/www.scientific.net/amm.670-671.554.

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The characteristics in microstructure, surface morphology, chemical composition, hardness and wear resistance of the three protective iron-based compound coatings prepared by Supersonic Arc Spraying (HVAS), were investigated by X-ray diffraction (XRD), Field emission scanning electron microscope (FESEM), Energy disperse spectroscopy (EDS) and Rockwell apparatus in this paper. It is indicated that the three coatings are typical layer and compact structures. The coatings are composed of Fe (s.s) phase and various kinds of ferric oxides, chrome carbides and/or intermetallic phase distributing along the interface of lamellar layers. More Cr and Ti, Al elements in the cored wires can degrease the diameter and alternate the morphologies of the holes in the coating, resulting from the formation of oxides, carbides and intermetallic phase during depositing the coating. The results indicate the SXTiAlC coating shows the most excellent wear performance among the three coatings. The wear behavior and mechanism are discussed.

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Більше джерел

Дисертації з теми "Intermetallic Coatings"

Hearley, J. A. "The corrosion behaviour of high velocity oxy-fuel NiAl intermetallic coatings." Thesis, University of Cambridge, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.603927.

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This thesis is a contribution to research into the corrosion behaviour of high velocity oxy-fuel (HVOF) thermally sprayed NiAl coatings. Investigations initially concentrated on the spraying of intermetallic compounds (IMCs), in particular NiAl. Results showed that NiAl could be successfully deposited as an IMC onto a 2.25Cr-1Mo substrate to produce a high quality coating of low porosity and excellent adhesion. The feasibility of using lower cost, less corrosion resistant substrates with a high performance protective coating offers the possibility of enhanced cost effectiveness allied with increased serviceability and ongoing environmental benefits. HVOF gun spray parameters were also optimised for the coating and it was found that they have a strong influence on coating properties. The most important parameter is the oxygen-fuel ratio as it influences the temperature, stoichometry and power of the flame. Coatings were sprayed under different ratios of fuel and oxygen flow rates and evaluated in terms of porosity, oxide content, Young's modulus and hardness. It was discovered that an increase in the oxygen-fuel ratio gave a coating of lower porosity with a higher oxide content, Young's modulus and improved hardness. The coatings showed excellent resistance to isothermal and cyclic oxidation due to the formation of an adherent and continuous alumina (A1₂O₃) scale. The corrosion behaviour in air-chlorine mixtures has also been evaluated at high temperatures along with resistance to thermal cycling. Initial results showed that the coating provided improved properties compared with some conventional materials. Preliminary hot corrosion testing with one real and three synthetic ashes revealed satisfactory coating performance. It was found that the coating microstructure was influential. In addition, results in erosion testing showed that good corrosion resistance is combined with excellent protection against this form of wear.

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OSTROVSKAYA, OXANA. "Oxidation resistance of Ti-Al intermetallic alloys and protection by ceramic coating." Doctoral thesis, Politecnico di Torino, 2018. http://hdl.handle.net/11583/2705474.

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In recent years, TiAl intermetallic alloys been widely used in aircraft and automotive industry. With the aim of improving the mechanical behavior and the oxidation resistance at high temperature of the TiAl alloys firstly designed, new intermetallic alloys of second and third generation have been successively developed. In this work, the oxidation resistance in air of four intermetallic alloys of second generation (Ti-48Al-2Cr-2Nb) and third generation ( Ti-48Al-2Nb-0.7Cr-0.3Si, Ti43.5Al-4Nb-1Mo and Ti-47Al-2Cr-8Nb) was investigated by TGA equipment under isothermal conditions in the range of 800-1000 °C. These alloys were cut from the core of bars, previously processed by Electron Beam Melting and successively heat-treated. The composition of the oxide layers was investigated by XRD, SEM-EDS and XPS. Each alloy showed different oxidation behavior at high temperatures. Layer exfoliation or spallation was observed for many samples, but at very different temperatures for the different alloys. When spallation did not happen in a significant extent the oxide layers grew according to a parabolic law. The kinetic rate constants and the activation energies were calculated. These kinetic parameters allowed to assess a rank of oxidation resistance, which can be correlated with the composition of the alloys. In order to improve the oxidation resistance of Ti-48Al-2Cr-2Nb, ceramic nitride coatings were deposited by a High Power Impulse Magnetron Sputtering (HiPIMS) method. Differently engineered TiAlN and TaAlN protective films were processed and their performances compared. Samples were submitted to thermal cycling under oxidizing atmosphere up to 850° C (40 cycles) and 950°C (100 and 200 cycles), at high heating and cooling rates. For this purpose, a burner rig able to simulate the operating conditions of the different stages of turbine engines was used. The microstructure and composition of samples before and after oxidation were investigated by several techniques: microscopy (optical and SEM-EDS), X-ray photoelectron spectrometry (XPS) and X-ray diffraction (XRD). All the TiAlN coatings differently processed provided a remarkable improvement of oxidation resistance. Good adhesion properties were observed even after repeated thermal shocks. HiPIMS pretreatments of the substrate surfaces, performed before the coating deposition, significantly affected the oxidation rate, the oxide layer composition and the coating/substrate adhesion. The oxide layers formed on the sample surface showed different thickness, depending on the presence of the protective coating and the processing path adopted for its deposition. The nitride coatings appreciably enhanced the oxidation resistance and sustained repeated thermal shocks without showing damage or spallation. Differently TaAlN coating did not improve the oxidation resistance of TiAl substrate.

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Wang, Zhiqi. "Study of Ti-Al-Cr oxidation resistant coatings for γ-TiAl based intermetallic alloys". Thesis, University of Surrey, 2002. http://epubs.surrey.ac.uk/844155/.

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Magnetron sputter deposition with single target materials was used to produce amorphous and crystalline Ti-A1-(Cr) alloy coatings on a Ti-50Al substrate. The following coatings were studied: Ti-50Al-10Cr, Ti-53Al-15Cr, Ti-50Al-20Cr and Ti-48Al. The microstructures of the coatings were studied in the as deposited condition and after devitrification and heat treatment. A random distribution of nano-precipitates was formed in amorphous as-deposited coatings. Columnar features were present when the as-received deposit had crystallised during sputter deposition. If crystallization occurred during deposition, a columnar microstructure formed with the columnar fibres being parallel to the deposition direction. For the Ti-50Al-10Cr and Ti-53Al-15Cr deposits, the crystalline domains consisted of lamellar gamma // alpha, i.e. the crystalline deposits had a gamma // alpha texture. The alpha → alpha transformation occurred during deposition. Phase competition in the alloys was studied by combining thermodynamic modelling and transformation kinetics. At 1173K, the Ti-50Al-10Cr alloy transformed to a two-phase microstructure, consisting of the gamma and C14 Ti(Al, Cr)2 phases. The Ti-53Al-15Cr alloy transformed to a three-phase microstructure, consisting of the gamma, tau and the C14 Laves phase. The gamma and tau phases were mixed finely, with gamma // tau. The Ti-50Al-20Cr alloy transformed to a two-phase microstructure, consisting of the gamma and the Cl4 Laves phase. No orientation relationship between the gamma and the C14 Laves phase was observed. Phase evolution studies at lower temperatures in the range 773K to 973K indicated that for the amorphous Ti-48Al alloy, the phase transformation path is: the amorphous phase → alpha → gamma + alpha/alpha2. A fine lamellar structure was formed, with gamma being the dominant phase. For the Ti-50Al-20Cr alloy, the phase transformation path was: the amorphous phase → gamma → gamma + Ti(Al, Cr)2. The experimental observations and the modelling results have clearly suggested a tendency of amorphous phase stabilisation via Cr addition. Thermodynamic modelling also indicated that the driving force for amorphous alloy formation is not much less than that for the precipitation of disordered solution phases. Kinetically, the amorphous phase formation during sputter deposition is related to the suppression of surface diffusion at low substrate temperatures. The temperature processing window for ordered phase formation in the Ti-Al(-Cr) alloys during magnetron sputter deposition was evaluated by the effective diffusion distance. Time dependent nucleation calculations showed that in the Ti-48Al amorphous alloy, it would be kinetically easier to precipitate the alpha phase than the gamma phase. In the case of the Ti-50Al-20Cr alloy, the gamma phase forms in preference of alpha, which is consistent with experimental observations. Diffusion phenomena at the coating/substrate interface and the oxidisation of the coatings were also studied. The experimental Cr diffusion profiles and the simulations for the Ti-Al-Cr coatings and the Ti-50Al substrate indicated that diffusion at 1173K is reasonably slow. The Ti-50Al-10Cr, Ti-53Al-15Cr and the Ti-50Al-20Cr coatings could form protective oxide scales at 1173K. When a columnar structure was present in the crystalline deposit, cracking of the coating was observed when the coating was subject to thermal cycling from elevated temperatures. It is concluded that if cracking of the coatings was to be avoided, amorphous deposits should be preferred.

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Stuttle, Christopher. "The electrodeposition of tin coatings from deep eutectic solvents and their subsequent whisker growth." Thesis, Loughborough University, 2014. https://dspace.lboro.ac.uk/2134/17961.

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Анотація:

Tin electrodeposits produced from aqueous electrolytes are frequently used within the electronics industry due to their high solderability and corrosion protection. One limitation to using these deposits is their spontaneous formation of long conductive filament whiskers. These whiskers grow post-electrodeposition and increase the risk of unwanted electrical shorts within electronic devices. In this thesis, tin electrodeposits produced from a proprietary bright acid Tinmac electrolyte, currently used in industry, were studied. Electrodeposits were produced using a range of current densities with and without agitation and were characterised with respect to crystallographic orientation, topography and surface finish. Moreover, the intermetallic compound (IMC) growth produced at the copper substrate-tin coating interface was assessed over a period of time as its growth is considered to be a significant driving force behind whisker formation. In addition, a technique for the electrochemical anodic oxidation of tin electrodeposits on copper substrates was developed. This technique was used throughout this project for the study of IMC growth from tin electrodeposits as it was able to effectively remove the tin whilst leaving the IMCs and substrate unaffected. Ionic liquids exhibit promising electrochemical characteristics for electrodeposition but are still not widely utilised in industry. Their ability to deposit tin coatings has been studied in the present investigation. Trials concentrated on process optimisation to produce uniform electrodeposits by varying current density, SnCl2.2H2O concentration, and electrolyte composition. These deposits were then characterised and compared to tin coatings of similar thickness produced from Tinmac with respect to topography, surface finish, crystallographic orientation, IMC growth, and whisker propensity. Electrodeposits produced from the ionic liquid electrolyte exhibited a different crystallographic texture, topography, and IMC growth compared to those produced from Tinmac. Moreover, the deposit produced from the ionic liquid featured increased whisker growth compared to those produced from Tinmac, but in a wider context, far less growth than conventional tin electrodeposits in the literature. In addition, by exploiting other electrochemical characteristics of ionic liquids, such as their large potential window, future work may be able to produce novel tin or tin alloy electrodeposits which may further reduce the whisker propensity of deposits produced in this investigation.

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Jain, Syadwad. "Corrosion and protection of heterogeneous cast Al-Si (356) and Al-Si-Cu-Fe (380) alloys by chromate and cerium inhibitors." Columbus, Ohio : Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1145140821.

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Cinca, i. Luis Núria. "Study of the structure-properties relationship of Fe-Al, Nb-Al and Ni-Ti intermetallic coatings obtained by thermal spray technologies." Doctoral thesis, Universitat de Barcelona, 2008. http://hdl.handle.net/10803/1078.

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Анотація:

Due to the current interest on intermetallic compounds (IMCs), specially for their use at high temperatures being capable to substitute superalloys and, for the lately improvement of their lack of ductility, this work evaluates the use of intermetallics as coatings by using Thermal Spray technologies, thus providing improved surface component properties.
The IMCs chosen for this study have been the following: FeAl, NiTi and NbAl3. Regarding their high Al contents, the aluminides present low densities and the possibility to form protective alumina compact layers against hostile environments. NiTi was selected as an interesting intermetallic for its shape memory properties and excellent corrosion resistance.
FeAl and NbAl3 coatings were produced by means of High Velocity Oxygen Fuel process trying to optimize the spraying conditions in order to achieve the lowest oxidation and porosity content as possible. On the other hand, Air Plasma Spraying and Vaccum Plasma Spraying were also evaluated for the production of NiTi coatings; in that case, the main purpose was the prevention of titanium oxidation and retention of autenitic NiTi phase, so that its shape memory properties could be preserved. The coatings were properly characterized by Scanning and Transmission Electron Microscopies and X-ray diffraction analysis. Afterwards, they were tested in laboratory conditions in order to study the mechanical properties such as hardness, sliding and abrasion wear and, corrosion and oxidation resistance.
FeAl coatings (obtained from a mechanically alloyed and a mechanically milled powders) were compared in terms of oxidation and wear resistance. A higher hardness was found to be correlated with a higher abrasion resistance. Iron aluminide coatings showed to have a fairly good oxidation resistance up to 900ºC. The uniform oxide scale without significantly spallation guarantees a reliable performance at such temperature.
The NbAl3 coating was about 20% harder than the hardest nitinol and iron aluminide coatings. Nb-Al based deposits displayed more wear damage than iron aluminides.
When these coatings were oxidized, they followed a logarithmic behaviour but with a much more rapid kinetics than the iron aluminide coatings. At 900ºC, whereas the steady state is reached for a weight increase below 10% in the different Fe-Al coatings, the corresponding to the Nb-Al coatings increases up to 40% due to the pesting phenomenon.
With regard to the NiTi coatings, those obtained from HVOF presented the highest retention of original austenitic phase. The hardness of such coatings is much higher than that of the iron aluminide coatings and a correlation was also found with their abrasion resistance. Finally, the as-sprayed VPS and HVOF coatings exhibitted superior corrosion resistance than APS in terms of corrosion potentials and current densities.
Els compostos intermetàl.lics han anat adquirint al llarg de les últimes dècades una gran importància en el món metaal·lúrgic, en especial per l'interès de reduir-ne la seva fragilitat i fer viable el seu ús estructural.
De tots els compostos intermetàl.lics que es coneixen, ens hem centrat com ha estudi dins de la present tesi en els aluminurs i en el nitinol (Ni-Ti). El grup dels aluminurs és bastant estudiat actualment a nivell de materials en volum degut a les expectatives que suposa poder disposar d'unes aleacions amb alta resistència, baixa densitat (degut a la presència de l'alumini) i la possibilitat d'oferir bones prestacions a alta temperatura (degut a la formació d'una capa compacta d'alúmina). Com a representació dins d'aquest grup, bàsicament cal fer menció als sistemes Fe-Al, Ni-Al i Ti-Al. Els seus elevats punts de fusió, claus per aquestes aplicacions deriven de la naturalesa del seu enllaç. Es coneixen, fins i tot, intermetàl.lics, anomenats refractaris amb punts de fusió per sobre dels 1600ºC; dos exemples en són el MoSi2 i el NbAl3. Per això, a fi de comparar dos tipus d'aluminurs, es va escollir el FeAl, com a representant del primer gruo i, el NbAl3, com a representant del segon grup.
Pel que fa al nitinol, aquest es va escollir com a compost interessant en el món dels materials ja que té el què es coneix com a efecte memòria de forma i pseudoelasticitat a través d'una transformació martensítica. També presenten una bona resistència a la corrosió.
Perquè s'han aplicat tots aquests compostos com a recobriments? Pel que fa als aluminurs degut a problemes en els mètodes de processat convencionals i, perque dóna l'opció de disposar d'un substrat amb les prestacions mecàniques desitjades protegit amb un recobriment que pugui proporcionar-li una bona resistència a l'oxidació a alta temperatura.
En el cas del nitinol, un dels principals impediments és l'econòmic ja que fabricar peces en volum d'aquest material pot resultar molt car. Algunes de les prestacions que es tenen en ment per l'ús dels recobriments obtinguts a partir d'aquesta aliatge són la resistència a la corrosió i, si es pot aconseguir, un bon comportament també a desgast.
S'ha emprat doncs la Projecció Tèrmica per l'obtenció de recobriments, principalment les tècniques: projecció per Alta Velocitat (HVOF, High-Velocity Oxy-Fuel), projecció per Plasma Atmosfèric (APS, Atmospheric Plasma Spraying) i projecció per Plasma al Buit, (VPS, Vacuum Plasma Spraying).
L'obtenció i estudi dels recobriments d'HVOF de FeAl ha permès estudiar la influència del grau d'ordre-desordre en l'estructura i el tamany de gra amb les propietats caracteritzades. Per una banda, optimitzant els paràmetres s'han aconseguit recobriments menys porosos i amb menys oxidació. La projecció de partícules de major tamany permet retenir l'estructura nanocristal.lina inicial de la pols.
S'observà en general, que els recobriments de major duresa mostraren millor resistència al desgast abrasiu, mentre que la duresa no semblà ser una variable clau en el comportament a desgast per lliscament.
La resistència a l'oxidació a alta temperatura dels recobriments de FeAl presentà resultats acceptables a 900ºC però quan es pujà a temperatures més altes, l'atac fou més accelerat.
S'han obtingut per primera vegada recobriments de Nb-Al per Projecció Tèrmica, tot i que les dificultats associades a la pròpia naturalesa de la pols i la seva irregular distribució de tamanys de partícules, han fet que els recobriments resultessin bastant oxidats, fet que suposa un empobriment d'alumini.
En respecte al NiTi, es van comparar els recobriments obtinguts per APS, VPS i HVOF. Aquests estaven formats per una varietat de zones amorfes, nanocristal.lines amb alternança de fase austenítica i martensítica.
El desgast de dits recobriments semblà ser més acusat que l'observat en el sistema FeAl. La resistència a la corrosió dels recobriments de NiTi fou major pel VPS i HVOF que no pas el d'APS ja que el mecanisme de corrosió d'aquest últim ve donat per la facilitat de penetració de la solució de clorur sòdic a través de les esquerdes del recobriment.

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ETT, GERHARD. "Estudo eletroquimico da co-reducao de KBFsub4 e Ksub2 TIFsub6 em meio de uma mistura eutetica de LiF-NaF-KF para a obtencao do diboreto de titanio [TIB sub 2]." reponame:Repositório Institucional do IPEN, 1999. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10772.

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Tese (Doutoramento)
IPEN/T
Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP

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Fukátková, Pavla. "Zkřehnutí TiAl intermetalik indukované oxidací povrchu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-228935.

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This work aimed to study the effect of surface oxidation of TiAl intermetallic alloys, its fracture behavior and study the formation and stability of picked coatings that could prevent these phenomena. ?-TiAl alloy (Ti46Al7Nb) was examined by three different coatings (AlCr, AlCrN and AlCrNAg). Firstly, it was carried out short-term exposure to high temperature in an inert atmosphere for all coatings. Secondly, there were experiments of cyclic exposure to high temperature in normal atmosphere and isothermal high-temperature exposure in a normal atmosphere. During high-temperature experiments in normal atmosphere mass gain was measured and it was monitored a surface texture. Finally, the most promising coatings were chosen, and those were evaluated in bending strength.

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Roberts, Tracey. "The structure and stability of high temperature intermetallic phases for application within coating systems." Thesis, Cranfield University, 2009. http://dspace.lib.cranfield.ac.uk/handle/1826/4499.

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The reduction of noise and emissions is becoming increasingly important in civil aircraft jet engines as well as requirements for reduced fuel consumption and improved efficiency. This has resulted in the drive towards increasing turbine entry temperatures and the development of thermal barrier coatings (TBCs). Due to the effectiveness of the platinum-modified nickel aluminides currently used as bond coat layers for Ni-based superalloy TBCs, higher temperature ruthenium-containing bond coat layers are being examined as a possible low cost alternative to platinum. Rolls Royce have a patented process, whereby precious metal layers directly react with single crystal substrate alloys to form an aluminium containing surface coating. The aluminium is sourced from the single crystal alloy and the coating so formed has a + structure, but contains other intermetallic phases due to the reaction between the coating and the single crystal substrate. This bond coat layer acts as a diffusion barrier, which limits interdiffusion between the coating and the substrate. The aim of this research was to examine the stability of various phases within platinum and ruthenium-containing multilayer systems formed during the above reaction process and to determine the most stable intermetallics for inclusion in future coating systems. Foil samples were manufactured using multilayer sputter coating methods and the exothermic formation of these phases was examined using differential scanning calorimetry. The identification of the phases formed was carried out using X-ray diffraction. It was found that the interdiffusion between the initial multi-layers had been incomplete during the samples heat treatment, and so more intermetallic phases formed in some samples than aimed for. Hence, from the large number of samples studied it was shown that, as a result of kinetic factors, the reaction onset (or trigger) temperature was not related to the enthalpy of the intermetallic phases formed or the sample compositions within a target phase field. For the β-phase (NiAl) type intermetallic systems, the samples that produced the highest enthalpy values (i.e. the most stable intermetallic compounds) were those with the nominal compositions (in atomic %) of; ‘47Ni53Al’, ‘48Ni6Pt46Al’ and ‘51Ni7Ru42Al’. For the γ΄-phase (Ni3Al) type intermetallic systems, the highest enthalpy values were from samples with nominal compositions of ‘60Ni16Pt24Al’ and ‘74Ni5Ru24Al’

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Geers, Christine [Verfasser]. "Inhibition of coking and metal dusting on conventional alloys by using a nickel-tin intermetallic coating / Christine Geers." Aachen : Hochschulbibliothek der Rheinisch-Westfälischen Technischen Hochschule Aachen, 2013. http://d-nb.info/1033988405/34.

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Книги з теми "Intermetallic Coatings"

B, Dahotre Narendra, and Sudarshan T. S. 1955-, eds. Intermetallic and ceramic coatings. New York: Marcel Dekker, 1999.

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(Editor), Narnedra B. Dahotre, and T. S. Sudarshan (Editor), eds. Intermetallic and Ceramic Coatings (Materials Engineering, 13). CRC, 1999.

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Частини книг з теми "Intermetallic Coatings"

Deakin, M. J., S. Kerry, and J. R. Nicholls. "The Formation of Intermetallic Diffusion Barriers by High Temperature Reaction Synthesis of Sputter Deposited Multilayers." In Protective Coatings and Thin Films, 489–99. Dordrecht: Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-011-5644-8_39.

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Divinski, S. V., N. V. Dubovitskaya, V. I. Franchouk, L. N. Larikov, and O. A. Shmatko. "Intermetallic Coatings with Nano- and Quasicrystalline Structures on Al -Based Substrates." In Advanced Light Alloys and Composites, 495–500. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-015-9068-6_65.

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Fan, Ding, Yao Ning Sun, Jian Bin Zhang, and Ming Sun. "Laser Processed Intermetallic Matrix Composite Coatings on Ni-Based Superalloy Substrate." In Key Engineering Materials, 1338–41. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-456-1.1338.

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Yano, D. H. S., C. Brunetti, G. Pintaude, and A. S. C. M. D'Oliveira. "Modification of NiAl Intermetallic Coatings Processed by PTA with Chromium Carbides." In 18th International Federation for Heat Treatment and Surface Engineering, 190–204. 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959: ASTM International, 2011. http://dx.doi.org/10.1520/stp49432t.

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Jin, Guo, Qing Fen Li, Bin Shi Xu, Hai Dou Wang, and Shi Cheng Wei. "Research on the Microstructure and Micro-Mechanics Properties of NiAl Intermetallic Coatings." In Fracture and Damage Mechanics V, 675–78. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-413-8.675.

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Oki, Sachio, Kazuyoshi Kamachi, and Susumu Gohda. "Formation of Intermetallic Compound Layer Formed by Diffusion Treatment of Thermal Spray Coatings, and its Application." In Transactions of the Materials Research Society of Japan, 173–79. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-0789-8_14.

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Malyshev, Viktor, Nataliia Uskova, Dmytro Shakhnin, Tetiana Lukashenko, Viktor Antsibor, and Zafer Ustundag. "High-Temperature Electrochemical Synthesis of Nanostructured Coatings of Molybdenum (Tungsten)–Nickel (Cobalt) Alloys and Intermetallic Compounds." In Springer Proceedings in Physics, 165–76. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-92567-7_10.

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Datta, P. K., J. S. Burnell-Gray, and K. Natesan. "Coating Technology." In Intermetallic Compounds - Principles and Practice, 561–88. Chichester, UK: John Wiley & Sons, Ltd, 2002. http://dx.doi.org/10.1002/0470845856.ch27.

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Cook, Desmond C., and Richard G. Grant. "Iron-zinc Intermetallics in Commercial Galvanneal Steel Coatings." In Mössbauer Spectroscopy Applied to Magnetism and Materials Science, 225–71. Boston, MA: Springer US, 1996. http://dx.doi.org/10.1007/978-1-4899-1763-8_10.

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Тези доповідей конференцій з теми "Intermetallic Coatings"

Leshchinsky, Evgeny, Elena Maeva, and Oleksandra Bielousova. "High Dense Fe-Al Composites Made by Annealing of Cold-Sprayed Coatings." In ITSC2015, edited by A. Agarwal, G. Bolelli, A. Concustell, Y. C. Lau, A. McDonald, F. L. Toma, E. Turunen, and C. A. Widener. ASM International, 2015. http://dx.doi.org/10.31399/asm.cp.itsc2015p0434.

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Abstract The main goal of the combined Cold Spray – Sintering technology development is to obtain high density ductile Fe- Al intermetallics based thermal barrier coatings as an alternative to conventional ZrO2 coatings widely applied in industry. The task of this paper is to examine the structural changes of cold sprayed Al-AISI 316L composite coatings due to synthesis of Fe-Al intermetallics during annealing and find the conditions of high density composite formation. A dense Fe/Al intermetallic-Al composite coating is obtained. Three factors are found to play the main role in the structure formation of dense Fe-Al intermetallic composite coating: i) layered structure, ii) particle size and thickness of Fe and Al layers, iii) annealing temperature.

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Bu, H., B. Jodoin, M. Yandouzi, and C. Lu. "Investigation of Heat Treatment on Cold Sprayed Aluminum Coatings on Magnesium Substrates with Different Status." In ITSC2011, edited by B. R. Marple, A. Agarwal, M. M. Hyland, Y. C. Lau, C. J. Li, R. S. Lima, and A. McDonald. DVS Media GmbH, 2011. http://dx.doi.org/10.31399/asm.cp.itsc2011p0908.

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Abstract Large pure aluminum powders were deposited on as cast-, T4- and T6-AZ91D magnesium substrates using cold spray. Heat treatment was applied to the coated components under vacuum at 400°C for different holding time. The effects of the heat treatment on the microstructure as well as the coating/substrate adhesion strength were investigated. Thick (~ 400µm) and dense (<1% porosity) Al coatings have been obtained on the three different substrates. During heat treatment, Mg17Al12 (β) and Al3Mg2 (γ) intermetallic phases were formed at the Al/Mg interface and the thickness of the intermetallics layers increased with the holding time. No significant thickness difference of the intermetallics layers were observed on as cast- and T6-AZ91D substrates, while thicker layers took place on the T4- substrate. It is believed that the higher Al concentration within the T4-AZ91D material could be beneficial for intermetallic growth because less enrichment is required to reach the critical level for intermetallic formation in the substrate. Shear strength tests were performed on the as sprayed and after heat treatment coatings. The results revealed lower adhesion strength in the samples after heat treatment than the as sprayed ones which is attributed to the presence of brittle intermetallics layers at the coating/substrate interface.

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d'Oliveira, A., A. de Christo, and D. S. Vaz. "Evaluation of Intermetallic Coatings Processed by PTA." In ITSC2008, edited by B. R. Marple, M. M. Hyland, Y. C. Lau, C. J. Li, R. S. Lima, and G. Montavon. Verlag für Schweißen und verwandte Verfahren DVS-Verlag GmbH, 2008. http://dx.doi.org/10.31399/asm.cp.itsc2008p1078.

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Abstract Plasma Transferred Arc hardfacing (PTA) is an excellent tool for surface tailoring as it allows for the manipulation of coatings chemical composition. In particular in-situ alloy development can be achieved during the deposition of different powder mixtures. In this work powder mixtures of Ni-Al, Nb-Al and Fe-Al were deposited by PTA. Coatings were characterized for their mechanical features at room temperature evaluated by Vickers microhardness under 300gf load, nano- (0.04gf) and macro- (10kgf) scratch tests and pin-on-abrasive disc tests under 1kgf. Results showed very high dilution for the processed coatings with Vickers microhardness varing with the chemical composition of the deposited powder, mixtures, with the Fe based deposits exhibiting the lower hardness (below 400Hv) and the Nb-based deposits reaching 900HV. Scratch hardness followed Vickers micro hardness only for the Nb based coatings. Abrasion mechanism also varied for each alloy system and within each alloy system, the harder the coating the better the abrasive wear resistance. However when comparing the full set of coatings the Nb based coatings exhibited a superior performance and the Ni based deposits the poorer wear resistance.

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Moshref Javadi, M., H. Edris, and M. Salehi. "Effects of Heat Treatment on Properties of Plasma Spray NiAl Coatings." In ITSC2008, edited by B. R. Marple, M. M. Hyland, Y. C. Lau, C. J. Li, R. S. Lima, and G. Montavon. Verlag für Schweißen und verwandte Verfahren DVS-Verlag GmbH, 2008. http://dx.doi.org/10.31399/asm.cp.itsc2008p1453.

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Abstract For production of intermetallic coatings, various types of Ni-Al powders were plasma sprayed at different spray distance and the effect of heat treatment on phases, microstructures and microhardness of coatings was examined. XRD, SEM, EDAX and microhardness were used for characterization of the coatings. Heat treatment of the coatings in various temperatures caused changes in hardness of the coating, increased percentage of intermetallic compounds, completed intermetallic production reactions, but did not change porosity percent. Increasing heat treatment temperature caused oxidation and decreased improvement of coating properties.

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Maev, R. Gr, E. Leshchinsky, and E. Maeva. "New Cold Spray Based Technique of FeAl Intermetallic Compound Coating Synthesis." In ITSC2011, edited by B. R. Marple, A. Agarwal, M. M. Hyland, Y. C. Lau, C. J. Li, R. S. Lima, and A. McDonald. DVS Media GmbH, 2011. http://dx.doi.org/10.31399/asm.cp.itsc2011p1079.

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Abstract The FeAl intermetallic compound offers a combination of attractive properties such as thermal barrier, good strength at intermediate temperatures and an excellent corrosion resistance at elevated temperatures under oxidizing, carburizing and sulfidizing atmospheres. So they have attracted considerable attention as potential candidates for structural and coatings applications at elevated temperatures. However, the application of these intermetallics has been limited due to lack of deposition techniques and their low ductility at room temperature. To overcome the drawbacks we apply Low Pressure Cold Spray (LPCS) with following sintering for improving coating ductility and structure. The aim of this paper is to present the first results of FeAl intermetallic compound synthesis with this technique. A CS deposit is built up by the successive impact of individual powder particles that are the ‘‘building blocks’’ of the deposit. Sintering is applied to utilize reactions between the particles and obtain complex intermetallic compound. The microstructures and properties of the coatings were characterized by SEM, EDX and thermal diffusivity tests to define the structure formation mechanisms.

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Lee, H., H. Shin, and K. Ko. "Effects of Gas Pressure of Cold Spray on the Formation of Al Based Intermetallic Compound." In ITSC2009, edited by B. R. Marple, M. M. Hyland, Y. C. Lau, C. J. Li, R. S. Lima, and G. Montavon. ASM International, 2009. http://dx.doi.org/10.31399/asm.cp.itsc2009p0302.

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Abstract Post-annealing of cold spray coatings has great potential for wear applications because it produces intermetallic compounds at low temperature far below equilibrium. This study investigates the effects of spraying pressure on the intermetallics formed and their dispersion characteristics. In the experiments, Al and Al-Ni powders were sprayed on Ni and Al substrates at 0.7, 1.5, and 2.5 MPa and a portion of the coating samples were annealed in argon at 500, 550, and 600 °C. Detailed examinations showed that Al particles are subject to peening effects that can interfere with the formation of intermetallic compounds during annealing, but that the effects can be mitigated by controlling gas pressure. Spraying pressure was also found to have an effect on the formation of eutectic pores in Al-Ni composite coatings, with higher pressures corresponding to fewer pores.

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Tian, Zongjun, Lida Shen, Zhidong Liu, and Yinhui Huang. "Microstructure Characteristics and High-Temperature Oxidation Behavior of Plasma-Sprayed and Laser-Remelted MCrAlY Coatings on TiAl Intermetallics." In ASME 2011 International Manufacturing Science and Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/msec2011-50145.

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In order to further improve the high-temperature oxidation resistance of TiAl intermetallic alloys, MCrAlY coatings were fabricated by plasma spraying and plasma spraying-laser remelting technologies. The microstructures of the as-sprayed and laser-remelted MCrAlY coatings were studied. In addition, the oxidation behaviors at 850 °C for three samples were investigated. One sample is the matrix of TiA1 intermetallic alloys, the other one is processed by plasma-spraying MCrAlY coatings, and the third one is processed by plasma-spraying and laser-remelting MCrAlY coatings. It was revealed that the oxidation resistance of TiAl intermetallics is weak due to lack of protection of Al2O3 film formed on the surface. The plasma-sprayed MCrAlY coatings have better oxidation resistance than the TiAl intermetallics although the plasma-sprayed MCrAlY coatings have high density of porosity and a typical layered structure. It is demonstrated that most of the holes can be eliminated by laser remelting, leading to the best oxidation resistance of the third sample with the laser-remelted coatings. The high oxidation resistance of the laser-remelted coatings is mainly attributed to three aspects: firstly, an Al enriched zone on the coating surface is formed during laser remelting, which is transformed into a protective Al2O3 film during oxidation process. Secondly, laser remelting eliminates most of the defects in plasma-sprayed coatings and enhances its density, thus decreases the channel of oxidation diffusion in high temperature oxidation process. Thirdly, rapid cooling of laser remelting results in a grain refinement and a preferred oxidation of Al at the initial stage, leading to a reduction of oxidation rate.

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Wang, H. T., C. J. Li, G. J. Yang, C. X. Li, Q. Zhang, and W. Y. Li. "Microstructural Characterization of Cold-Sprayed Nanostructured FeAl Intermetallic Compound Coating and its Ball-Milled Feedstock Powder." In ITSC2007, edited by B. R. Marple, M. M. Hyland, Y. C. Lau, C. J. Li, R. S. Lima, and G. Montavon. ASM International, 2007. http://dx.doi.org/10.31399/asm.cp.itsc2007p0135.

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Abstract It is difficult to deposit dense intermetallic compound coatings by cold spraying directly using the compound feedstock powders due to their intrinsic low temperature brittleness. A method to prepare intermetallic compound coatings in-situ employing cold spraying was developed using a metastable alloy powder assisted with post-annealing. In this study, a nanostructured Fe/Al alloy powder was prepared by ball-milling process. The cold sprayed Fe/Al alloy coating was evolved in-situ to intermetallic compound coating through a post-annealing treatment. The microstructural evolution of the Fe-40Al powder during mechanical alloying and the effect of the post-annealing on the microstructure of the cold sprayed Fe(Al) coatings were characterized by optical microscopy, scanning electron microscopy and X-ray diffraction analysis. The results showed that the milled Fe-40Al powder exhibits lamellar microstructure. The microstructure of the as-sprayed Fe(Al) coating depends significantly on that of the as-milled powder. The annealing temperature significantly influences the in-situ evolution of the intermetallic compound. The annealing treatment at a temperature of 500oC results in the complete transformation of Fe(Al) solid solution to FeAl intermetallic compound.

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Zhang, Q., X. Wang, Z. Ren, G. Yang, C. Li, and C. Li. "Formation of NiAl Intermetallic Compound by Cold Spraying of Ball-Milled Ni/Al Alloy Powder Through Post Annealing Treatment." In ITSC2008, edited by B. R. Marple, M. M. Hyland, Y. C. Lau, C. J. Li, R. S. Lima, and G. Montavon. Verlag für Schweißen und verwandte Verfahren DVS-Verlag GmbH, 2008. http://dx.doi.org/10.31399/asm.cp.itsc2008p1208.

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Abstract Ni/Al alloy powders were synthesized by ball milling of nickel-aluminum powder mixture with a Ni/Al atomic ratio of 1:1. Ni/Al alloy coating was deposited by cold spraying using N2 as accelerating gas. NiAl intermetallic compound was evolved in-situ through post-spray annealing treatment of cold-sprayed Ni/Al alloy coating. The effect of annealing temperature on the phase transformation behavior from Ni/Al mechanical alloy to intermetallics was investigated. The microstructure of the mechanically alloying Ni/Al powder and NiAl coatings was characterized by scanning electron microscopy and X-ray diffraction analysis. The results show that a dense Ni/Al alloy coating can successfully be deposited by cold spraying using the mechanically alloyed powder as feedstock. The as-sprayed alloy coating exhibited a laminated microstructure retained from the mechanically alloying powder. The annealing of the subsequent Ni/Al alloy coating at a temperature higher than 850°C leads to the complete transformation from Ni/Al alloy to NiAl intermetallic compound.

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Song, B., S. J. Dong, H. L. Liao, C. Coddet, B. Hansz, and T. Grosdidier. "Property Improvement of Plasma-Sprayed FeAl Coating by Dry-Ice Blasting." In ITSC 2012, edited by R. S. Lima, A. Agarwal, M. M. Hyland, Y. C. Lau, C. J. Li, A. McDonald, and F. L. Toma. ASM International, 2012. http://dx.doi.org/10.31399/asm.cp.itsc2012p0651.

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Abstract Atmospheric plasma spray is considered as one of the most efficient methods for forming FeAl intermetallic coatings. But the performance of plasma-sprayed FeAl coatings was remarkably limited because of oxidation and phase transformation during the preparation. In the present work, FeAl intermetallic coatings were prepared by atmospheric plasma spray combined with dry-ice blasting. The microstructure, oxidation and porosity of FeAl intermetallic coatings were investigated. In addition, XRD measurements were also employed to illustrate the lattice-scale performance, e.g., dislocation density. The temperatures during plasma spray were also measured using an infrared pyrometer system. The results show that a denser B2-FeAl coating with a lower content of oxide and lower phase transformation can be achieved because of the cryogenic effect and the mechanical effect of dry-ice blasting. Moreover, the microhardness of FeAl coating was nearly increased by 72%, due to the lower porosity and higher dislocation density.

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Звіти організацій з теми "Intermetallic Coatings"

Z. Zak Fang and H. Y. Sohn. Novel Nanocrystalline Intermetallic Coatings for Metal Alloys in Coal-fired Environments. Office of Scientific and Technical Information (OSTI), August 2009. http://dx.doi.org/10.2172/978339.

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Henry, Jeffrey, and Joe Zhou. Advanced low-cost intermetallic coatings for molten salt pump impeller. Final report. Office of Scientific and Technical Information (OSTI), September 2019. http://dx.doi.org/10.2172/1566776.

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Park, J. H., and W. D. Cho. Fabrication of intermetallic coatings for electrical insulation and corrosion resistance on high-temperature alloys. Office of Scientific and Technical Information (OSTI), November 1996. http://dx.doi.org/10.2172/394383.

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Park, J. H., and T. F. Kassner. CaO insulator and Be intermetallic coatings on V-base alloys for liquid-lithium fusion blanket applications. Office of Scientific and Technical Information (OSTI), April 1996. http://dx.doi.org/10.2172/270426.

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