Synthesis and Characterization of Nanocomposite Coatings

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

doi:10.1007/978-94-011-4052-2_11

Cited by 4 publications

(3 citation statements)

References 25 publications

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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: 79%

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: 79%

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

et al. 2017

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“…The characteristics and performances of the resulting coatings are strongly influenced by the presence of defects, which corresponds to partly and fully melted particles with oxides, cracks, and porosity, as well as residual stresses [73]. In the case of Cr 3 C 2 -NiCr cermet coatings, it has been reported in the literature that hardness value increases from 846 HV to 1020 HV (20.5% increase) when shifting from microstructured coatings to nanostructured coatings [74,75]. This increased hardness is due to the uniformity of microstructure and presence of nano-phases and this high hardness is, to some extent, contributed to by high kinetic energy and low thermal energy associated with the HVOF process.…”

Section: Wear Resistance Of Cr 3 C 2 -Nicr and Wc-based Nanostructurementioning

confidence: 99%

Nanocrystalline Cermet Coatings for Erosion–Corrosion Protection

et al. 2019

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The processing techniques, microstructural characteristics, and erosion corrosion behaviour of Cr3C2–NiCr and tungsten carbide (WC)-based cermet coatings are reviewed in this work. Conventional and nanocrystalline Cr3C2–NiCr and WC-based cermet coatings are generally synthesized using thermal spray technique. The wear, erosion, and corrosion protection ability of conventional and nanocermet coatings are compared based on available literature. In Cr3C2–NiCr coatings, the corrosion resistance is offered by NiCr metal matrix while the wear resistance is provided by the carbide ceramic phase, making it suitable for erosion–corrosion protection. The nanocrystalline cermet coatings exhibits better erosion–corrosion resistance as compared to the conventional coatings. The nanocrystalline coatings reduces the erosion–corrosion rate significantly compared to conventional coatings. It is attributed to the presence of the protective NiCr metallic binder that allows easier and faster re-passivation when the coating is subjected to wear and the fine-grain structure with homogeneous distribution of the skeleton network of hard carbide phases. In addition, corrosion-accelerated erosion dominates the reaction mechanism of erosion–corrosion and, therefore, higher hardness, strength, and better wear resistance of nanocermet coating along with its faster repassivation kinetics accounts for improved corrosion resistance as compared to conventional coatings.

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“…Recently, much attention has been attracted to nanocomposites which contain more than one solid phase and where at least one of the phases has dimensions less than 100 nanometres; see, e.g. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. In particular, of special interest for electronic and optoelectronic applications are nanocomposites containing nanowires (second-phase inclusions of wire form and cross-section having dimensions in the nanometre range) embedded into a matrix [1][2][3][4][5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Misfit dislocations in composites with nanowires

Gutkin

Ovid’ko

Sheĭnerman

2003

J. Phys.: Condens. Matter

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A theoretical model is suggested which describes the generation and evolution of misfit dislocations in composite solids containing nanowires with rectangular cross-section. In the framework of the model, the ranges of the geometric parameters (nanowire sizes, misfit parameter, interspacing between the nanowire and the free surface of the composite) are calculated at which the generation of various misfit dislocation configurations (loops, semi-loops and dipoles) is energetically favourable. Transformations of these dislocation configurations and their specific features are discussed.

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Synthesis and Characterization of Nanocomposite Coatings

Cited by 4 publications

References 25 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

Nanocrystalline Cermet Coatings for Erosion–Corrosion Protection

Misfit dislocations in composites with nanowires

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