Pulse division of plasma spheroids

Rudenskaya, N. A.; Швейкин, Г. П.; Sokolova, N. V.; Rudenskaya, M. V.

doi:10.1134/s001250080911010x

Dokl Chem

2009

DOI: 10.1134/s001250080911010x

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Pulse division of plasma spheroids

N. A. Rudenskaya

Г. П. Швейкин

N. V. Sokolova

et al.

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Cited by 5 publications

(2 citation statements)

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“…Taking into account that plasma processes are accompanied by particle spheroidization and that, according to [1], sphe roidization initiates the pulse division of spheroids and leads to the avalanche like formation of ultradisperse daughter spheroids, we attribute the observed porosity of subsonic coatings precisely to the pulse division process. Large particles are partially melted in a plasma flow, while the small particles are completely melted and form layers in the coating that spread among melted and unmelted particles and, thus, pro vide high quality of the coating.…”

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New plasma ceramic coatings

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It is expedient to use plasma methods for deposit ing protective coatings containing refractory compo nents. Plasma generators for coating deposition are selected on the basis of the composition, dispersion of initial powders, and properties that should be imparted to the coating. Wide potentialities of modern plasma generators enable the deposition of microcomposites of different types and compositions.In this paper, we summarize the results on fabrica tion of new materials as biceramic layered composites and boride composites on the stainless steel substrate sprayed by common (subsonic) and supersonic plasma generators.Initial materials were ceramic powders: oxide (based on Al 2 O 3 -13TiO 2 ) and boride (CrB 2 , TiB 2 ) compositions. Oxide microcomposites were fabricated from ultradisperse Al 2 O 3 -13TiO 2 powders with addi tions of SiO 2 and ZrO 2 . Boride based powders were preliminarily subjected to spheroidization. Coatings were deposited by spraying polydisperse compositions. The reference was a corundum coating. Powders were deposited on stainless steel and ceramic substrates by means of a subsonic (subsonic coatings) and super sonic (supersonic coatings) plasma guns. The Ni-Al alloy was used as a sublayer material.Metallographic studies showed that the interface of the deposited oxide layers with the basic metal is of high quality and has neither pores nor unfused areas (Fig. 1). The coatings consist of two layers: the sub layer and the basic ceramic layer. The basic layer has a layered composite structure (Fig. 1a): the light col ored matrix material contains evenly distributed darker, shiny, and white inclusions. Inclusions of dif ferent composition are irregular, partially fused, or spherical, or have a shape of layers. Such a structure is characteristic of the subsonic coatings. The coatings deposited by supersonic spraying contain spherical inclusions of only one type, ZrO 2 , in the structure of layers, and the phases of other compositions occur as separate irregular inclusions (dark phase) and fine grained regions (Fig. 1b). Such coatings contain a much larger number of zircon layers than the coatings produced by a subsonic plasma generator. This can be caused by the high flow rate and disintegration of par CHEMICAL TECHNOLOGY 10 μm (a) (b) Fig. 1. Microstructure of the oxide coating sprayed by (a) subsonic and (b) supersonic plasma generators.

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“…This process can be rep resented as follows: The sprayed particles are strongly heated in the high temperature zone, and nitrogen in plasma is in the ionized state and readily interacts with the active particle surface continuously renewed by convective flows [1]. This leads to formation of Ti x O y N z oxynitrides.…”

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New plasma ceramic coatings

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Ultradispersed hardening of metal-ceramic microcomposites and coatings containing borides of transition metals in a low-temperature plasma flow

Руденская

2019

Dokl. Akad. nauk

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Influence of Pulsed Division of Oxide Spheroids in a Plasma Flow Upon the Structure of Coatings

Rudenskaya¹,

Rudenskaya²

2018

Vescì Akademìì navuk Belarusì. Seryâ fizika-tehničnyh navuk

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The purpose of this part of the research was to study the structural transformations at the transition of particlemicrocomposites from plasma flow into sprayed layer, taking into account grinding of spheroids. The results of investigations of the impulse fission of oxide spheroids in a plasma flow, the granulometric composition of microcomposites of two compositions: SiO2–TiO2, SiO2–TiO2–Al2O3 with an initial particle size of 40–50 μm, 50–63, 63–71 μm and the structure of plasma coatings from them are presented. The process of pulsed fission of spheroids in a plasma stream is found in all the compositions under study and is most intensive in systems of: SiO2–TiO2 (with initial particle size of 40–50 μm and 50–63 μm), SiO2– TiO2–Al2O3 (with initial particle size 40–50 μm). The features of the formation of structural fragments of coatings of various shapes (spheroidized and melted) and composition (completely amorphous, with multilayer shells, including amorphous ones) are studied. It is shown that the proposed technology makes it possible to obtain ceramic coatings with amorphous-crystalline structure, which features are determined by size and composition of initial microcomposites grinding of them directly in the sputtering process allows formation of finer structures in the coatings and, accordingly, significantly changing their performance characteristics and quality (adhesion strength, wear resistance is 3 times higher than that of corundum coatings, porosity is less than 1 %).

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Pulse division of plasma spheroids

Cited by 5 publications

References 1 publication

New plasma ceramic coatings

New plasma ceramic coatings

Ultradispersed hardening of metal-ceramic microcomposites and coatings containing borides of transition metals in a low-temperature plasma flow

Influence of Pulsed Division of Oxide Spheroids in a Plasma Flow Upon the Structure of Coatings

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