Nanostructured coatings

He, Jianhong; Schoenung, Julie M.

doi:10.1016/s0921-5093(01)01986-4

Cited by 168 publications

(99 citation statements)

References 98 publications

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“…This was carried out using the Rietveld method for lattice refinement [57][58][59][60] . The details of crystallite size determination can be found in the following studies 11,13 . The powders in the as-received (AR) and milled condition were used to produce coatings 120 to 200 μm thick on AISI 310 stainless steel sheet samples (50 x 20 x 2 mm) using a Sulzer Diamond Jet HVOF thermal spray equipment.…”

Section: Methodsmentioning

confidence: 99%

“…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 .…”

mentioning

confidence: 99%

“…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 . Brandt 17 investigated the effects of different HVOF spraying parameters on the fatigue resistance of samples coated with Cr 3 C 2 -NiCr powders; Lavernia [18][19][20] conducted several investigations in this area, ranging from synthesis of nanostructured Cr 3 C 2 -25(Ni-20Cr) coatings to the development of nanocrystalline structures using cryogenic environment; He and Schoenung 11 performed a comprehensive study of nanostructured coatings produced by HVOF, with emphasis on nanostructured WC-Co and Cr 3 C 2 -25(Ni-20Cr) powders; Guilemani et al 21 conducted microstructural characterization of Cr 3 C 2 -NiCr coatings produced by HVOF, besides investigating the effects of thermal cycling and extended isothermal treatment on the adhesion properties of as-coated and thermally treated samples; Roy et al 22 also compared the microstructure and mechanical properties (hardness, elastic modulus and fracture toughness) of coatings produced with as-received and nanostructured Cr 3 C 2 -25(Ni-20Cr) powders.…”

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confidence: 99%

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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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Section: Methodsmentioning

confidence: 99%

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confidence: 99%

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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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“…These coatings have the potential to provide further improvement in their tribomechanical performance. Previous researchers have used conventional thermal spray systems to deposit coatings from nanostructured WC-Co feedstocks [9,10,[19][20][21]. In these previous investigations, agglomerated and sintered nanosized particles have been used for the deposition of nanostructured thermal spray coatings, generally resulting in a predominantly bimodal coating structure, where the coating architecture exhibits micrometer-sized zones with nanometer-sized structure [19].…”

Section: Introductionmentioning

confidence: 99%

Influence of Post-treatment on the Microstructural and Tribomechanical Properties of Suspension Thermally Sprayed WC–12 wt%Co Nanocomposite Coatings

et al. 2017

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The potential to improve the tribomechanical performance of HVOF-sprayed WC-12Co coatings was studied by using aqueous WC-12Co suspensions as feedstock. Both as-sprayed and hot-isostatic-pressed (HIPed) coatings were studied. Mathematical models of wear rate based on the structure property relationships, even for the conventionally sprayed WC-Co hardmetal coatings, are at best based on the semiempirical approach. This paper aims to develop these semiempirical mathematical models for suspension sprayed nanocomposite coatings in as-sprayed and heat-treated (HIPed) conditions. Microstructural evaluations included transmission electron microscopy, X-ray diffraction and scanning electron microscopy equipped with energy-dispersive X-ray spectroscopy. The nanohardness and modulus of the coated specimens were investigated using a diamond Berkovich nanoindenter. Sliding wear tests were conducted using a ball-on-flat test rig. Results indicated that the HIPing post-treatment resulted in crystallization of amorphous coating phases and increase in elastic modulus and hardness. Influence of these changes in the wear mechanisms and wear rate is discussed. Results are also compared with conventionally sprayed high-velocity oxy-fuel hardmetal WC-Co coatings.

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“…Commercial agglomerated nanopowders are now available. However, the process must be carefully controlled in order to keep the initial nanostructure in the final coating (Ref [14][15][16]. Typical nanostructured ceramic coatings obtained by plasma spraying from agglomerated powders include alumina (Ref 17), alumina-titania (Ref 18,19), cemented tungsten carbides (Ref 20,21), or zirconia (Ref 22,23).…”

Section: Introductionmentioning

confidence: 99%

Deposition of Al2O3-TiO2 Nanostructured Powders by Atmospheric Plasma Spraying

et al. 2008

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Al 2 O 3 -13%TiO 2 coatings were deposited on stainless steel substrates from conventional and nanostructured powders using atmospheric plasma spraying (APS). A complete characterization of the feedstock confirmed its nanostructured nature. Coating microstructures and phase compositions were characterized using SEM, TEM, and XRD techniques. The microstructure comprised two clearly differentiated regions. One region, completely fused, consisted mainly of nanometer-sized grains of c-Al 2 O 3 with dissolved Ti +4 . The other region, partly fused, retained the microstructure of the starting powder and was principally made up of submicrometer-sized grains of a-Al 2 O 3 , as confirmed by TEM. Coating microhardness as well as tribological behavior were determined. Vickers microhardness values of conventional coatings were in average slightly lower than the values for nanostructured coating. The wear resistance of conventional coatings was shown to be lower than that of nanostructured coatings as a consequence of Ti segregation. A correlation between the final properties, the coating microstructure, and the feedstock characteristics is given.

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Nanostructured coatings

Cited by 168 publications

References 98 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

Influence of Post-treatment on the Microstructural and Tribomechanical Properties of Suspension Thermally Sprayed WC–12 wt%Co Nanocomposite Coatings

Deposition of Al2O3-TiO2 Nanostructured Powders by Atmospheric Plasma Spraying

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