Nanostructured Materials: Science &amp; Technology. Volume 50

Chow, Gan‐Moog; Носкова, Н. И.

doi:10.21236/ada366976

Cited by 16 publications

(17 citation statements)

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“…Thus, the sprayed coatings are made up of the molten powders and some semi-molten powders. It has been noted that these special structures of sprayed coatings benefit the properties of the nanostructured coating, especially the improvement of denser coating with better hardness surface and better strength [110][111][112].…”

Section: Nanostructured Coatingmentioning

confidence: 99%

Porosity and Its Significance in Plasma-Sprayed Coatings

et al. 2019

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Porosity in plasma-sprayed coatings is vital for most engineering applications. Porosity has its merits and demerits depending on the functionality of the coating and the immediate working environment. Consequently, the formation mechanisms and development of porosity have been extensively explored to find out modes of controlling porosity in plasma-sprayed coatings. In this work, a comprehensive review of porosity on plasma-sprayed coatings is established. The formation and development of porosity on plasma-sprayed coatings are governed by set spraying parameters. Optimized set spraying parameters have been used to achieve the most favorable coatings with minimum defects. Even with the optimized set spraying parameters, defects like porosity still occur. Here, we discuss other ways that can be used to control porosity in plasma-sprayed coating with emphasis to atmospheric plasma-sprayed chromium oxide coatings. Techniques like multilayer coatings, nanostructured coatings, doping with rare earth elements, laser surface re-melting and a combination of the above methods have been suggested in adjusting porosity. The influences of porosity on microstructure, properties of plasma-sprayed coatings and the measurement methods of porosity have also been reviewed.

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Section: Nanostructured Coatingmentioning

confidence: 99%

Porosity and Its Significance in Plasma-Sprayed Coatings

et al. 2019

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“…Thus, the sprayed coatings are made up of the molten powders and some semi-molten powders. It has been noted that this special structures of sprayed coatings benefit the properties of nanostructured coating, especially the improvement of denser coating with better hardness surface and better strength [93][94][95].…”

Section: Nanostructured Coatingmentioning

confidence: 99%

Porosity and Its Significance in Plasma Sprayed Coating: A Review

Odhiambo¹,

Li²,

Zhao³

et al. 2019

Preprint

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Porosity in plasma sprayed coatings is vital for most engineering applications. It is either advantageous or disadvantageous depending on the functionality of the coating and the immediate working environment. Consequently, the formation mechanisms and development of porosity has been extensively explored to find out modes of controlling porosity in plasma sprayed coatings. In this work, a comprehensive review of porosity on plasma sprayed coatings is established. The formation and development of porosity on plasma sprayed coatings are governed by set spraying parameters. Optimized set spraying parameters have been used to achieve the most favorable coatings with minimum defects. Even with the optimized set spraying parameters, defects like porosity still occur. Here, we discuss other ways that can be used to control porosity in plasma sprayed coating with emphasis to atmospheric plasma sprayed chromium oxide coatings. Techniques like multi-layer coatings, nano-structured coatings, doping with rare earth elements, laser surface re-melting and a combination of the above methods have been suggested in adjusting porosity. The influences of porosity on properties of plasma sprayed coatings and the measurement methods of porosity have also been reviewed.

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“…This feature makes them ideal raw products for the preparation of composite materials, reaction active systems, means of vector drug delivery in humans, chemical energy capacitors (with the use of hydrogen or natural gas), and others. The high specific surface and lowered agglomeration temperature of ultradispersed metal oxide powders make them irreplaceable raw products for the produc tion of fine grained ceramics [3], which will become the most in demand material in many fields of indus try over the next few decades: the development of next generation cathodes and anodes for power supplies [4,5], catalysts for petrochemistry [6,7], gas sensors, electrochromic devices [8], and multilayer ceramic capacitors [9]. The use of ultradispersed powders enables to obtain materials with high density and elec troconductivity; this is essential for the development of production of small size high speed electronic devices with a large set of functions and simulta neously low energy consumption due to interactions inside complex nanostructures [10].…”

Section: Introductionmentioning

confidence: 99%

Modified sol-gel synthesis of ultradispersed powders of cobalt, nickel, molybdenum, and tungsten oxides and composites based on them

et al. 2014

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An approach is proposed to the creation of laboratory technology of ultradispersed VI and VIII groups metal oxide powders, as well as composites based on them, intended to provide a broad range of fine grained ceramics. The study covers the modified sol gel synthesis of cobalt, nickel, tungsten, and molyb denum oxides powders and composites based on them by Me VIII Me VI O x type having a particle size of 10 to 1000 nm. The influence of the reaction mixture composition on the phase composition of such binary systems was shown. The conditions of obtaining of metal oxide powders with certain dispersions were investigated: the molar ratio stabilizer/metal, thermal treatment mode, etc. The effect of various sol stabilizers, hexamethyle netetramine, N,N dimethyloctylamine, and tetraethylammonium hydroxide, on the dispersity of metal oxide powders was shown. All synthesized powders have been characterized using instrumental methods: X ray diffraction, transmission electron microscopy, N 2 adsorption-desorption, and a laser confocal micro scope. The optimal parameters of modified sol gel synthesis of ultradispersed powders have been determined: the qualitative and quantitative compositions of the reaction mixture, thermal treatment, etc. The developed approach allows to synthesize ultradispersed metal oxide particles with a given size and vary it within 10-130 nm range with a precision of 20-30 nm.

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Nanostructured Materials: Science & Technology. Volume 50

Cited by 16 publications

References 0 publications

Porosity and Its Significance in Plasma-Sprayed Coatings

Porosity and Its Significance in Plasma-Sprayed Coatings

Porosity and Its Significance in Plasma Sprayed Coating: A Review

Modified sol-gel synthesis of ultradispersed powders of cobalt, nickel, molybdenum, and tungsten oxides and composites based on them

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