Synthesis and characterization of nanostructured Cr3C2NiCr

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

doi:10.1016/s0965-9773(99)00010-0

Cited by 46 publications

(25 citation statements)

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“…, Kock 5,6 , Hellstern 7 , Lavernia 8,9 and Suryanarayana 10 among others who have worked in this area, confirmed the superior mechanical properties of nanocrystalline materials compared with their conventional counterparts. In the last few decades, several kinds of coatings have been developed using nanocrystalline materials.…”

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confidence: 80%

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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confidence: 80%

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

et al. 2017

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“…The decrease in average particle size with milling time in nitrogen was significant compared to that in hexane. Reductions in Cr 3 C 2 -25(Ni20Cr) powder particle size to 5 µm upon milling in hexane have been reported 5,26 . However, in this study the particle size of powders milled for the same duration in hexane was only 10 µm.…”

Section: Thermal Sprayed Coatingsmentioning

confidence: 99%

“…These coatings can be used in corrosive environments at temperatures (up to 900 °C), much higher than that at which the harder WC-Co coatings can be used. The latter undergo decarburization to W 2 C or to W upon extended exposure to high temperatures and to degradation of mechanical properties 1,[2][3][4][5] . However, one of the shortcomings of Cr 3 C 2 -NiCr coatings is its lower hardness and lower wear resistance, compared to WC-Co coatings 6 .…”

Section: Introductionmentioning

confidence: 99%

“…Mechanical milling enables large quantities of nanostructured materials to be produced and during milling the powder grains are continuously refined by cold welding and fracturing [21][22][23][24] . Nanostructured composites consisting of hard particles and a metal binder, such as Cr 3 C 2 -NiCr or WC-Co, have been prepared by mechanical milling 5,25,26 . Milling of Cr 3 C 2 -NiCr has been done in a variety of environment.…”

Section: Introductionmentioning

confidence: 99%

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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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“…During mechanical milling, particle welding and fracturing result in severe plastic deformation. Using mechanical milling, Cr 3 C 2 -NiCr and WC-Co nanocomposites were successfully synthesized [19][20][21] in our laboratories.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Nanocomposite Coatings

Ice

Lavernia

2000

Nanostructured Films and Coatings

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The synthesis of nanocomposite coatings is described in this paper. The nanocomposite feedstock powders are synthesized using mechanical milling, and the characteristics of the milled powders, i.e., morphology, agglomeration behavior, powder size, grain size and structural evolution during milling, are analyzed using X-ray diffraction, SEM and TEM. Using high velocity oxygen fuel (HVOF) spraying, the nanocomposite coatings are sprayed, and the microstructures and properties of the resulting coatings are characterized.

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Synthesis and characterization of nanostructured Cr3C2NiCr

Cited by 46 publications

References 2 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

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

Synthesis and Characterization of Nanocomposite Coatings

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