Nanostructured powders based on aluminum reinforced by silicon nitride designed for spraying of multifunctional strengthened coatings

2019 ◽  
pp. 65-73
Author(s):  
T. I. Bobkova ◽  
B. V. Farmakovsky ◽  
N. A. Sokolova
Keyword(s):  
Silicon Nitride ◽  
Composite Powder ◽  
High Energy ◽  
Cold Gas Dynamic Spraying ◽  
Powder Materials ◽  
Structure And Properties ◽  
Gas Dynamic ◽  
Composition Structure ◽  
New Phase ◽  
Nanostructured Powders

The work deals with topical issues such as development of composite nanostructured powder materials. The results of creating powders based on the system “aluminum–nitride of silicon” are presented. Complex investigations of the composition, structure and properties of powder materials, as well as coatings formed on their basis by supersonic cold gas dynamic spraying, were carried out. It has been found that the high-energy treatment of a powder mixture of aluminum with nanofibers of silicon nitride provides the formation of a composite powder in which a new phase of the Si(1-х)AlхO(1-х)Nх type is formed, which additionally increases the hardness in the coatings to be sprayed.

Study of a hardened multilayer coating obtained by the cold gas-dynamic spraying with laser intensification

2020 ◽  
Vol 86 (7) ◽  
pp. 33-38
Author(s):  
A. I. Gorunov
Keyword(s):  
Multilayer Coating ◽  
Hardened Layer ◽  
Cold Gas Dynamic Spraying ◽  
Carbide Powder ◽  
Multilayer Coatings ◽  
Powder Materials ◽  
Layer By Layer ◽  
Gas Dynamic ◽  
Powder Particles ◽  
Cold Gas

When reconstructing products obtained using additive technologies based on layer-by-layer melting of metal powder by concentrated energy flows, it is advisable to use methods that minimize melting of the initial powder and reduce structural heterogeneity of the material. Cold gas-dynamic spraying with laser-induced intensification of the process (CGDSL) is one of them. The multilayer coatings obtained by the CGDSL method have a homogeneous metal structure though a significant surface roughness attributed to the particle size of the original powder is observed. The goal of the study is to develop a new method of post-processing of multilayer coatings obtained by CGDSL which can provide a hardened layer on their surface. A hardened layer is formed through introduction of boron carbide powder particles into the laser-molten region formed on the surface of the coating based on 316L stainless steel. An acoustic wave triggered by a «microexplosion» induced by a laser pulse above the surface pushes carbide particles in different directions. Some of them are embedded into the melt pool on the surface of the coating. Thus, the laser microdetonation cartooning of the surface of the CGDSL coating is implemeted. Study of the hardened layer revealed a high content of B, C, Cr, Fe, and Ni. Moreover, it is shown that solid carbides of rhombic form are formed in the hardened layer. Chemical and elemental analyzes showed that diamond-shaped carbides — carbides of the type (Fe, Cr)xBy — contain a high concentration of Cr, Fe and a relatively small percentage of C. Most likely formation of diamond-shaped carbides occurs due to interaction of chromium which is a part of the initial hardened coating with boron that released from the surface of BC particles under laser impact. The developed method provides hardening of the surface layer of the coating previously obtained by CGDSL by embedding the BC powder particles into the surface. The technology of hardening CGDSL coatings can be implemented using other powder materials.

scholarly journals PROCESSES AND TECHNOLOGIES OF COLD GAS DYNAMIC SPRAYING OF AGRICULTURAL EQUIPMENT

2021 ◽  
pp. 4-14
Author(s):  
Nataliia Veselovska ◽  
Oleg Gaidamak ◽  
Mykhailo Karpiichuk ◽  
Jylia Kucherenko
Keyword(s):  
New Technology ◽  
Industrial Applications ◽  
Cold Gas Dynamic Spraying ◽  
Powder Materials ◽  
Functional Coatings ◽  
Gas Dynamic ◽  
Electrical Conductivities ◽  
Coating Formation ◽  
Laval Nozzles ◽  
Cold Gas

The article is devoted to the technology of cold gas-dynamic spraying - a relatively new technology for creating functional coatings in which narrowed-expanding nozzles (De Laval nozzles) are used, in which solid powders are sprayed at or close to supersonic speed in the direction of the substrate, where they plastically deform and adhere. Cold gas dynamic spraying is an innovative process that has received widespread scientific interest and industrial applications in the automotive, aerospace and biotechnology industries in recent years. Spraying various powder materials in this way provides protection against corrosion and can increase the mechanical strength and wear resistance of details. With that method it is possible to create functional coatings with different thermal conductivities and electrical conductivities, which can be used as insulation materials, conducting and isolation surface layers of parts, coatings for controlling gaps, restoring and repairing details. The article discusses modern developments in the field of experimental analysis of technologies and processes of cold gas-dynamic spraying, the systems of cold gas-dynamic spraying and coating formation are determined and the parameters and principles of the process are described. The installation for spraying surfaces developed at VNAU is presented and researches and the analysis of possibility of use of a method of a cold gas-dynamic spraying for restoration of details of autotractor equipment of agricultural purpose are carried out.

Restoration and repair of equipment by supersonic cold gas-dynamic and micro-plasma spraying

2019 ◽  
pp. 64-70
Author(s):  
A. I. Dmitryuk ◽  
B. V. Farmakovsky ◽  
T. I. Bobkova ◽  
D. A. Gerashchenkov
Keyword(s):  
Wear Resistance ◽  
Corrosion Resistance ◽  
Plasma Spraying ◽  
Composite Powder ◽  
High Hardness ◽  
Powder Materials ◽  
Gas Dynamic ◽  
Applied Coating ◽  
Carbide Particles ◽  
Cold Gas

The technological process of restoring and repairing of equipment and its components by supersonic cold gas-dynamic and micro-plasma spraying has been developed. For steel products Fe–Cr–Al-based composite powder has been used being surface reinforced with tungsten carbide particles. For nickel and titaniumproducts composite powder from an alloy of the Ni–Cr–Mn–Sn–Si–W–Re system (Ce, La, Y) has been applied being superficially reinforced by corundum nanopowder. During the work, a high hardness of the applied coating, corrosion resistance and wear resistance were achieved. Real examples of the successful restoration and repair by powder materials are given, and spraying technologies are proposed.

Structure and properties of aluminum coatings obtained by the cold gas-dynamic spraying method

2006 ◽  
Vol 13 (1) ◽  
pp. 125-129 ◽  
Author(s):  
L. I. Tushinsky ◽  
A. P. Alkhimov ◽  
V. F. Kosarev ◽  
A. V. Plokhov ◽  
N. S. Mochalina
Keyword(s):  
Cold Gas Dynamic Spraying ◽  
Structure And Properties ◽  
Aluminum Coatings ◽  
Gas Dynamic ◽  
Spraying Method ◽  
Cold Gas

Producing clad powder by disintegrator with new rotor design

2020 ◽  
pp. 91-96
Author(s):  
E. A. Samodelkin ◽  
M. A. Korkina ◽  
B. V. Farmakovsky ◽  
E. Yu. Zemlyanitsyn
Keyword(s):  
Protective Coatings ◽  
Machine Building ◽  
Cold Gas Dynamic Spraying ◽  
Powder Materials ◽  
Wear Resistant Coatings ◽  
Cladding Layer ◽  
Rotor Design ◽  
Gas Dynamic ◽  
Powder Particles ◽  
Clad Powder

The article presents the results of the development of technology for producing composite materials, in particular the production of clad powder materials for wear-resistant coatings. In the proposed method, a clad powder is processed by disintegrator with a new design of the working rotor. Powder particles consist of solid nuclei – core of micron size, surrounded by a cladding layer of soft components. A modified rotor design was used to develop a technology for producing clad powders with desired properties for example Stellite– Aluminum composition. The thickness of the cladding layer is 1.0–2.0 μm, and the firm adhesion of the hard and soft components required for the coating is confirmed. The necessary fraction of the composite powder 50–60 microns for gas-dynamic spraying has been achieved. The obtained experimental set of the plated powder was tested to obtain functional protective coatings using supersonic cold gas-dynamic spraying. Studies have shown that the adhesive strength of the coating was less than 75 MPa and the porosity less than 1.0%. The coating is recommended to protect some components and parts of precision machine-building and power engineering.

On the structure and properties of functional coatings from composite powders of the aluminum – silicon nitride system reinforced with a SiALON type phase

2021 ◽  
pp. 80-89
Author(s):  
T. I. Bobkova ◽  
A. I. Dmitryuk ◽  
E. A. Nezhensky ◽  
N. A. Lukyanova
Keyword(s):  
Silicon Nitride ◽  
Composite Powder ◽  
Development Process ◽  
Structure And Properties ◽  
Functional Coatings ◽  
Composite Powders ◽  
Distribution Of Elements ◽  
Composite Granules ◽  
Sprayed Coatings ◽  
Aluminum Silicon

The work studies development process of a composite powder of the aluminum – silicon nitride system and sprayed coatings using the mechanism of the formation of composite granules and the distribution of a hardening phase of the Sialon type in them. Various modes of powder composite mechanosynthesis are studied. The results of determining the hardness, chemical composition and distribution of elements in the resulting coating are given.

Composite Powder Materials for Stabilization of Drilling Fluids Which Provides High Durability of Cutting Instruments Dolot Used in Process of Drilling Oil Wells

2012 ◽  
Vol 616-618 ◽  
pp. 1762-1765
Author(s):  
K.S. Negmatova ◽  
S.S. Negmatov ◽  
Y.A. Salimsakov ◽  
J.N. Negmatov ◽  
Sh.S. Isakov
Keyword(s):  
Composite Powder ◽  
Oil Wells ◽  
Powder Composite ◽  
Drilling Fluids ◽  
Powder Materials ◽  
Structure And Properties ◽  
Mechanism Of Formation ◽  
Effective Mechanism ◽  
High Durability

The results of studies of the structure and properties of a viscous gossypol resin and effective mechanism of formation of powder composite soluble chemicals on its base for stabilization of the drilling fluids used in drilling oil wells are shown in this work.

scholarly journals Effect of roughness on the bond strength of decorative coating applied by cold gas-dynamic spraying

2021 ◽  
Vol 2131 (2) ◽  
pp. 022035
Author(s):  
M Dudnik ◽  
Yu Gordin
Keyword(s):  
Adhesion Strength ◽  
Heating Temperature ◽  
Strength Properties ◽  
Cold Gas Dynamic Spraying ◽  
Powder Materials ◽  
Technological Parameters ◽  
Decorative Coating ◽  
Adhesion Properties ◽  
Gas Dynamic ◽  
Cold Gas

Abstract The adhesion strength of joints obtained by cold gas-dynamic spraying (CGDS) on cast iron base has been investigated. It is known that corrosion resistance of CGDS coatings is largely determined not only by the nature of the sprayed material, but also by its adhesion properties. This paper is a method for predicting the adhesion strength of a protective and decorative coating, which is a useful tool for engineers when studying the effect of certain technological parameters on the adhesion strength of cold gas-dynamic spraying. The results of an experimental study of pretreated surfaces and powder materials are presented. The optimum heating temperature was determined and a choice of material and method of substrate processing which ensures maximum adhesion strength under given technological conditions was substantiated. It was shown that the temperature of heating of the product surface essentially influences the adhesion strength of the coating. Besides the quality of the preprocessed surface is one of the factors providing the coating adhesion strength to the substrate. The dependences of the influence of the temperature of heating of the sample and the roughness of the surface on the adhesion strength are presented. The use of cold gas-dynamic spraying as a method providing high strength properties of copper and zinc protective-decorative coatings is proved.

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