Nanocrystalline Fe-40Al coating processed by thermal spraying of milled powder

Grosdidier, Thierry; Tidu, Albert; Liao, Hanlin

doi:10.1016/s1359-6462(00)00611-4

Cited by 80 publications

(73 citation statements)

References 28 publications

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“…The nanoscale microstructure can be retained in the coatings despite the high temperatures and melting involved in forming a dense coating. Plasma spraying [393][394][395][396][397][398][399] and HVOF spraying [400][401][402][403] of nanostructured feedstock powders of metals or ceramics proved to be potential methods to form nanocrystalline coatings. The HVOF method is preferred to plasma spraying because of its higher droplet velocity and lower thermal energy levels, yielding denser structure, and higher bond strength between the coating and the substrate.…”

Section: Thermal Sprayed Coatingsmentioning

confidence: 99%

Nanocrystalline materials and coatings

Tjong

Chen

2004

Materials Science and Engineering: R: Reports

838

345

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In recent years, near-nano (submicron) and nanostructured materials have attracted increasingly more attention from the materials community. Nanocrystalline materials are characterized by a microstructural length or grain size of up to about 100 nm. Materials having grain size of $0.1 to 0.3 mm are classified as submicron materials. Nanocrystalline materials exhibit various shapes or forms, and possess unique chemical, physical or mechanical properties. When the grain size is below a critical value ($10-20 nm), more than 50 vol.% of atoms is associated with grain boundaries or interfacial boundaries. In this respect, dislocation pile-ups cannot form, and the Hall-Petch relationship for conventional coarse-grained materials is no longer valid. Therefore, grain boundaries play a major role in the deformation of nanocrystalline materials. Nanocrystalline materials exhibit creep and super plasticity at lower temperatures than conventional micro-grained counterparts. Similarly, plastic deformation of nanocrystalline coatings is considered to be associated with grain boundary sliding assisted by grain boundary diffusion or rotation. In this review paper, current developments in fabrication, microstructure, physical and mechanical properties of nanocrystalline materials and coatings will be addressed. Particular attention is paid to the properties of transition metal nitride nanocrystalline films formed by ion beam assisted deposition process. #

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Section: Thermal Sprayed Coatingsmentioning

confidence: 99%

Nanocrystalline materials and coatings

Tjong

Chen

2004

Materials Science and Engineering: R: Reports

838

345

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“…The characteristics of ultra high flying velocity and relatively low temperature for injected feedstock powders favor depositing of nanostructured coatings, 6,10) as the nanofeatures of the powders could remain well after the spraying process. HVOF/HVAF sprayed nanostructured coatings have prove great success in improving the performances of existing material systems, and are believed to be one of the most possible ways for commercial applications of nanomaterials.…”

Section: )mentioning

confidence: 99%

“…3,4) Nanostructured (or nanocrystalline) materials, usually characterized by a microstructural length scale in the 1-200 nm regime, have received considerable interest for the superior properties to their conventional coarse-grained counterparts, such as increased hardness and strength, improved ductility, enhanced corrosion and wear resistance. 5,6) Cryomilling, the mechanical attrition of powders within a cryogenic medium, is a recently developed method to synthesis nanostructured metallic or cermet powder. 5,7) Nanostructured bulk and coating materials using the cryomilled powders as precursors have exhibited encouraging results in improving material properties.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Properties of a Nanostructured NiCrC Alloy Coating for Boiler Tubes Protection

et al. 2008

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In this paper, a high-performance nanostructured NiCrC alloy coating was synthesized by HVAF spraying of nanostructured feedstock powder, which was prepared using cryogenic ball milling (cryomilling) method. The morphology and microstructure of the powder and coating were characterized by metallographic microscope, scanning electron microscope and transmission electron microscope. A Vickers microhardness tester was employed to determine the mechanical properties of the coating. The corrosion resistance was tested with thermogravimetric method, and the thermal stability of the coating was examined as well. The experimental results indicated that the nanostructured NiCrC coating possessed a very dense and uniform microstructure and exhibited sufficient thermal stability during long time heat treatment. Furthermore, the mechanical and anti-corrosion properties were enhanced so much compared with its conventional coarse-grained counterpart. The excellent performances make this HVAF sprayed nanostructured coating a hopeful candidate for improving boiler tubes protection.

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“…Recently, the processing of nanocrystalline intermetallic coatings by thermal spray of milled powders has been successfully achieved for Ni and Fe based alloys. [1][2][3][4] The major advantage of this processing route is its cost effectiveness, which may rapidly lead to industrial application of nanocrystalline materials. Grosdidier et al 4) prepared the nanocrystalline Fe-40Al coating with HVOF thermal spraying and found the hardness increased obviously as comparing with a conventional coating.…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3][4] The major advantage of this processing route is its cost effectiveness, which may rapidly lead to industrial application of nanocrystalline materials. Grosdidier et al 4) prepared the nanocrystalline Fe-40Al coating with HVOF thermal spraying and found the hardness increased obviously as comparing with a conventional coating. In the present paper, the synthesis and characterization of nanocrystalline iron aluminide intermetallic compound powders, sinters and coatings are studied.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Nanocrystalline Iron Aluminide Intermetallic Compounds

Kato

Fukumoto

2003

Mater. Trans.

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Refining grain size to the nanocrystalline level has been suggested as a way of improving strength while enhancing ductility and toughness. In the present study, nanocrystalline iron aluminide intermetallic compounds were synthesized using mechanical alloying, sintering and high velocity oxy-fuel (HVOF) thermal spraying from the elemental powders. The phase changes occurred during milling, thermal spraying and annealing studied from magnetic and structural points of view. XRD, SEM, DSC and dynamic ultra-microhardness tester were used for examining the microstructure, thermal stability, mechanical properties and wear behavior of the milled powders and coatings. The current results demonstrated that, by controlling the experimental conditions, it was possible to prepare iron aluminide intermetallic compound with nano-size grains.

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Nanocrystalline Fe-40Al coating processed by thermal spraying of milled powder

Cited by 80 publications

References 28 publications

Nanocrystalline materials and coatings

Nanocrystalline materials and coatings

Preparation and Properties of a Nanostructured NiCrC Alloy Coating for Boiler Tubes Protection

Synthesis and Characterization of Nanocrystalline Iron Aluminide Intermetallic Compounds

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