Synthesis of nanostructured Cr3C2-25(Ni20Cr) coatings

He, Jianhong; Ice, M.; Lavernia, Enrique J.

doi:10.1007/s11661-000-0290-0

Cited by 85 publications

(40 citation statements)

References 17 publications

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“…In the last few decades, several kinds of coatings have been developed using nanocrystalline materials. Chromium carbide based coatings are used to protect components exposed to severe conditions in a number of industries [11][12][13][14] . A variety of techniques have been used to prepare chromium carbide based coatings and the high velocity oxygen fuel (HVOF) process is widely used, as it produces smooth, low porosity, dense and adherent coatings, without altering significantly the integrity of the carbide particles 11,15,16 .…”

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High Temperature Erosion-oxidation Resistance of Thermally Sprayed Nanostructured Cr3C2-25(Ni-20Cr) Coatings

et al. 2017

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This study reports the high temperature erosion-oxidation (E-O) behavior of conventional and nanostructured Cr 3 C 2 -25(Ni-20Cr) coatings prepared by high velocity oxygen fuel (HVOF) spraying. As-received and nanostructured Cr 3 C 2 -25(Ni-20Cr) powders with mean crystallite sizes of 145 nm and 50 nm respectively, were used to prepare 120 -200 μm thick coatings on AISI 310 samples. The E-O behavior of the coatings prepared with the as-received (AR) and nanostructured (NS) powders was determined as weight change in a custom designed rig at room temperature, 450, 700 and 800 ºC. The Vickers microhardness, Young's Modulus and fracture toughness of the AR and NS coatings were determined, and the NS coatings exhibited higher values compared with the AR coatings. The E-O resistance of the NS coating was higher than that of AR coating at all temperatures, and particularly at 800 ºC. The increase in E-O resistance of the NS coatings is due to its superior mechanical properties as well as to the presence of some heterogeneities in the AR coatings. The E-O mechanisms of both types of the coatings are discussed, with special attention to that at high temperatures. The results suggest that at 800 ºC the E-O process is controlled by erosion of the oxide.

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High Temperature Erosion-oxidation Resistance of Thermally Sprayed Nanostructured Cr3C2-25(Ni-20Cr) Coatings

et al. 2017

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“…The abrasion resistance of thermal sprayed coatings is related to the relative fracture toughness. 14) The indentation fracture method is employed here to characterize the relative fracture toughness of both the HVAF sprayed nanostructured and conventional NiCrC coatings. Under a load of 5 N, no crack was found in either of the coatings.…”

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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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“…The indentation fracture method has been used to obtain information about the relative fracture toughness of coatings 29 . In this study, at 1000 g hardness test load, cracks emanating from the indents were observed in both types of coatings.…”

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confidence: 99%

Microstructure and mechanical properties of thermal sprayed nanostructured Cr3C2-Ni20Cr coatings

et al. 2008

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Cr 3 C 2 -Ni20Cr coatings have been used for corrosion and wear resistant applications. However, one of the shortcomings of these coatings is its low hardness, and consequent low wear resistance, for long term high temperature applications. Nanostructured coatings of many materials have exhibited higher hardness and strength compared with conventional coatings of the same material. Consequently, nanostructured coatings of other materials, including Cr 3 C 2 -Ni20Cr have been attempted to enhance overall performance. In this study the effects of high energy milling parameters on Cr 3 C 2 -25(Ni20Cr) powder characteristics as well as the microstructure and mechanical properties of nanostructured Cr 3 C 2 -25(Ni20Cr) coatings formed by high velocity oxygen fuel (HVOF) spraying have been evaluated. The average particle size and crystallite size of milled Cr 3 C 2 -25(Ni20Cr) powders decreased with increase in milling time and this decrease was more pronounced in nitrogen compared to that in hexane. This difference has been attributed to a cushioning effect in the latter medium. The coatings prepared with milled Cr 3 C 2 -25(Ni20Cr) powders had a more uniform microstructure, were harder and had higher relative fracture toughness compared with coatings prepared with as-received powders.

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Synthesis of nanostructured Cr3C2-25(Ni20Cr) coatings

Cited by 85 publications

References 17 publications

High Temperature Erosion-oxidation Resistance of Thermally Sprayed Nanostructured Cr3C2-25(Ni-20Cr) Coatings

High Temperature Erosion-oxidation Resistance of Thermally Sprayed Nanostructured Cr3C2-25(Ni-20Cr) Coatings

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

Microstructure and mechanical properties of thermal sprayed nanostructured Cr3C2-Ni20Cr coatings

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