Thermal Stability of Nanostructured Cr&lt;SUB&gt;3&lt;/SUB&gt;C&lt;SUB&gt;2&lt;/SUB&gt;-NiCr Coatings

He, Jianhong; Ice, M.; Schoenung, Julie M.; Lavernia, Enrique J.; Shin, Dong Hyuk

doi:10.1361/105996301770349385

Cited by 44 publications

(14 citation statements)

References 7 publications

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“…Chromium carbide-based materials are generally employed to produce hard coatings for high temperature wear applications including sliding, fretting, abrasion, and erosion in powder generation industry, aerospace industry, oil-refining industry, heat-treatment rolls, and coal burning boiler tubes [1,2]. The chromium carbides-nickel chromium (Cr 3 C 2 -NiCr) cermet coatings have been widely practiced in industry, caused by the advantageous combination of Cr 3 C 2 ceramic phase with good wear-resistance and NiCr metal phase which provides high oxidation resistance to high temperature [3,4].…”

Section: Introductionmentioning

confidence: 99%

Influence of Process Parameters on High Velocity Oxy-Fuel Sprayed Cr3C2-25%NiCr Coatings

et al. 2017

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Abstract:In this work, the Cr 3 C 2 -25% NiCr powder was deposited on stainless steel with different combustion pressures and powder feed rates using HVOF technique. The microstructure, porosity, micro-hardness, indentation fracture toughness, adhesion strength, and wear resistance at 500 • C of the coatings were investigated. The results showed that HVOF sprayed Cr 3 C 2 -25% NiCr coatings possessed low porosity, high micro-hardness, and enough adhesion strength. The powder feed rate had obvious effect on porosity, micro-hardness and indention fracture toughness of the coatings, and the coating sprayed under the powder feed rate of 33.5 g/min possessed the optimal performance. The wear tests illustrated that the HVOF sprayed Cr 3 C 2 -25NiCr coating possessed good wear resistance at the temperature of 500 • C, in which the coating sprayed at the powder feed rate of 33.5 g/min had the best wear resistance due to its dense structure and enough fracture toughness.

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Section: Introductionmentioning

confidence: 99%

Influence of Process Parameters on High Velocity Oxy-Fuel Sprayed Cr3C2-25%NiCr Coatings

et al. 2017

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“…Plasma spraying is one of the methods used to form nanocomposite structure, but it must overcome obstructing and difficult processing challenges. [2][3][4][5][6] The first challenge is that the low mass and poor flow characteristics restrict the smooth flow of individual nanoparticles in the spray nozzle during thermal spraying. [2] In addition, nanosized powders tend to agglomerate and form clogs in the plasma gun nozzle, hindering the smoothness of the flow and thereby imparting nonuniform coating.…”

Section: Introductionmentioning

confidence: 99%

“…Several techniques are being developed to get nanocoating/composites by plasma such as employment of spray dried agglomerates of nanopowders, blending and spraying of bimodal powders with controlled plasma parameters, explosion of loose nanoagglomerates in plasma flame, etc. [2][3][4][5][6] In this study, we are trying to modify the feedstock powder by two ways simultaneously, viz. spheroidization and nanocrystallization/grain refinement of spray particles.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of nanostructured spherical aluminum oxide powders by plasma engineering

Laha

Balani

Agarwal

et al. 2005

Metall Mater Trans A

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Irregularly shaped aluminum oxide particles were plasma atomized resulting in narrow size range distribution of spherical nanostructured powders. Cooling rates, on the order of 10 6 to 10 8 K/s, were obtained from the different quenching medias, viz. air, water, and liquid nitrogen. Plasma-engineered powder particles developed nanosize crystallites, while solidification provided insight into the morphological feasibility in refinement of grain size. X-ray diffraction (XRD) methods have been used to quantify the crystallite size obtained with different quenching media. Raman peak shift validated the X-ray analysis in anticipating the grain refinement with increasing cooling rates. Salient structural morphology characteristics and a detailed understanding of spheroidized plasma-sprayed alumina powders were analyzed through scanning electron microscopy (SEM) studies. Formation of nanograins, novel metastable phases, and amorphous structure were endorsed by transmission electron microscopy (TEM) investigations.

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“…So far, the thermal stability of the nanostructured metallic coatings has only been scarcely studied. He et al [13] revealed that the increase in microhardness of an annealed nanostructured Cr 3 C 2 -NiCr coating is attributed to the formation of a high density of nanosized Cr 2 O 3 particles. In the case of FeAl coatings, the high hardness of the as-deposited nanostructured coatings was stable up to approximately 600°C.…”

Section: Introductionmentioning

confidence: 99%

Microstructure of a High-Velocity Oxy-Fuel Thermal-Sprayed Nanostructured Coating Obtained from Milled Powder

Grosdidier

Morniroli

2007

Metall Mater Trans A

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The mechanisms responsible for the different types of microstructure present in a nanostructured coating prepared by high-velocity oxy-fuel (HVOF) spraying of the Y 2 O 3 -reinforced milled FeAl powder have been established. Nano-and microsized grains were present both in the melted splats and the retained unmelted powder particles. In the unmelted powder particles, equiaxed grains formed by recrystallization from the heavily deformed and disordered structure present in the initial powder. Their size was controlled by the degree of advancement of the recrystallization process and the larger grains contained ribbonlike antiphase boundaries (APBs) separating large, ordered domains. In the melted zones, the grain size (and shape) was controlled by the local efficiency of the heat extraction during solidification. The Al evaporation during thermal spraying led to a modification of the local chemistry that resulted in the formation of the Fe 3 Al and FeAl phases containing fine networks of APBs. These APBs formed by sequential ordering from the high-temperature disordered FeAl phase that formed from the melt. Despite the high-temperature processing and recrystallization processes, both the melted and unmelted zones contained dislocations that result from residual stresses as well as from peening by the powder particles during spraying.

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Thermal Stability of Nanostructured Cr<SUB>3</SUB>C<SUB>2</SUB>-NiCr Coatings

Cited by 44 publications

References 7 publications

Influence of Process Parameters on High Velocity Oxy-Fuel Sprayed Cr3C2-25%NiCr Coatings

Influence of Process Parameters on High Velocity Oxy-Fuel Sprayed Cr3C2-25%NiCr Coatings

Synthesis of nanostructured spherical aluminum oxide powders by plasma engineering

Microstructure of a High-Velocity Oxy-Fuel Thermal-Sprayed Nanostructured Coating Obtained from Milled Powder

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