scholarly journals CREATION OF COMPOSITE ELECTRICALLY CONDUCTIVE COATINGS BY GAS DYNAMIC SPRAYING

2021 ◽  
pp. 122-132
Author(s):  
Oleg Gaidamak ◽  
Viktor Matviychuk
Keyword(s):  
Composite Coating ◽  
Composite Coatings ◽  
Cold Gas Dynamic Spraying ◽  
Additional Component ◽  
Electrically Conductive ◽  
Conductive Coatings ◽  
Aluminum Powders ◽  
Residual Content ◽  
Gas Dynamic ◽  
Electrically Conductive Coatings

The article presents the results of research of spraying processes of composite electrically conductive coatings using copper C01-11 and aluminum A20-11 powders in order to determine the effect of components on each other in the formation of cold gas-dynamic spraying (CGDS) and the development of recommendations for the introduction of additional component to obtain a composite coating with a given ratio of different components. For example, when at a working air temperature of 300 ° C the copper sputtering coefficient is almost zero, it is a search for the experimental dependence of the sputtering coefficient change depending on the percentage of components of copper and aluminum powders in the sprayed mixture and determination of their residual content in the coating. based on the obtained data of the sputtering coefficients of copper and aluminum. The CGDS method obtained blanks with composite coatings from mixtures of powders of aluminum A20-11 and copper C01-11 at different initial concentrations of aluminum by weight (from 0 to 100% with a step of 10%) under otherwise equal conditions (air pressure 0,6 MPa, temperature air heating 300 ° C). The sputtering coefficient of a mixture of copper and aluminum and the residual content of components in the sprayed composite coatings were found. Data on the residual content of the individual components in the sprayed coating allows to determine the composition of the source powder required for spraying a given content of each of the components in the coating. The dependences of the spraying coefficients of copper C01-11 and aluminum A20-11 on the mass content of aluminum in the sprayed mixture were found. When the initial concentration of aluminum is less than 66%, the coefficient of copper deposition is greater than the coefficient of deposition of aluminum. Both increase with increasing concentration of aluminum until it reaches 61%. At high concentrations of aluminum (more than 66%) the spray coefficients of copper, aluminum and their mixtures coincide. The results obtained on the residual content of the components in the coating allow you to select the composition of the source powder required to obtain the desired content of components in the coating. For example, the maximum residual copper content (~ 95%) can be obtained by adding 30-40% aluminum to the starting powder. The obtained results prove the influence of the components on each other and justify the amount of introduction of an additional component for spraying a composite coating containing a component that is difficult to spray.

scholarly journals CREATION OF ELECTRIC CONDUCTIVE COATINGS USING GAS-DYNAMIC SPRAYING

2021 ◽  
pp. 72-80
Author(s):  
Oleg Gaidamak ◽  
Viktor Matviychuk
Keyword(s):  
Composite Coating ◽  
Heating Temperature ◽  
Composite Coatings ◽  
Cold Gas Dynamic Spraying ◽  
Aluminum Concentration ◽  
Additional Component ◽  
Conductive Coatings ◽  
Aluminum Powders ◽  
Residual Content ◽  
Gas Dynamic

The article presents the results of research on the processes of creating conductive coatings based on copper and aluminum in order to determine the interaction of components on each other during cold gas-dynamic spraying (CGDS) and substantiate the method of introducing an additional component to obtain the desired composite coating. In particular, under conditions when the copper sputtering coefficient is almost zero (at a working air temperature of 300 °C), it is the search for the experimental dependence of the sputtering coefficient on the percentage of copper and aluminum powders in the sprayed mixture, determining their residual content in the coating and then calculating based on these data, the sputtering coefficients of copper and aluminum. The CGDS method obtained samples with composite coatings from mixtures of aluminum and copper powders at different initial mass concentrations of aluminum (from 0 to 100%, in increments of 10%) Other things being equal (air pressure 0,6 MPa, air heating temperature 300 ° C) . The spraying ratio of the mixture and the residual content of the components in the obtained composite coatings were measured. Data on the residual content of the components in the coating allows you to select the composition of the source powder required to obtain a given content of components in the coating. The dependences of the sputtering coefficients of copper and aluminum on the mass content of aluminum in the sprayed mixture are found. At an initial concentration of aluminum less than 66%. the coefficient of copper sputtering is higher than the coefficient of sputtering of aluminum. Both increase monotonically with increasing aluminum concentration until it reaches 61%. At high concentrations of aluminum (more than 66%) the spray coefficients of copper, aluminum and their mixtures coincide. The obtained data on the residual content of the components in the coating allows you to select the composition of the source powder required to obtain a given content of components in the coating. For example, the maximum residual copper content (~ 95%) can be obtained by adding to the source powder 30-40% aluminum. The obtained results confirm the interaction of the components on each other and justify the method of introducing an additional component to obtain a composite coating containing a component that is difficult to spray.

scholarly journals Electrically conductive coatings consisting of Ag-decorated cellulose nanocrystals

Cellulose ◽  
2017 ◽  
Vol 24 (5) ◽  
pp. 2191-2204 ◽  
Author(s):  
Nicole Meulendijks ◽  
Marieke Burghoorn ◽  
Renz van Ee ◽  
Maurice Mourad ◽  
Daniel Mann ◽  
...  
Keyword(s):  
Cellulose Nanocrystals ◽  
Electrically Conductive ◽  
Conductive Coatings ◽  
Electrically Conductive Coatings

Effect of gas phase composition on functional-gradient coatings formation by supersonic cold gas dynamic spraying

2019 ◽  
pp. 65-69
Author(s):  
A. M. Makarov ◽  
T. I. Bobkova ◽  
A. F. Vasiliev ◽  
D. A. Geraschenkov ◽  
I. S. Prudnikov ◽  
...  
Keyword(s):  
Phase Composition ◽  
Gas Phase ◽  
Composite Coatings ◽  
Cold Gas Dynamic Spraying ◽  
Composition Gradient ◽  
Practical Applications ◽  
Functional Gradient ◽  
Gas Dynamic ◽  
Gradient Coatings ◽  
Cold Gas

The paper develops method for manufacturing wear and corrosion-resistant gradient coating. A special feature of the proposed method is the creation of chemical composition gradient due to controlled variation of the gas phase composition when applying supersonic cold gas-dynamic spraying. This ensures high adhesive strength of the composite coatings of the metal-non-metal system in combination with high micro-hardness of the peripheral layers. Such functional gradient coatings have wide practical applications.

Screen-printed Cu3BiS3-polyacrylic Acid Composite Coatings

1998 ◽  
Vol 13 (9) ◽  
pp. 2453-2456 ◽  
Author(s):  
H. Hu ◽  
O. Gomez-Daza ◽  
P. K. Nair
Keyword(s):  
Polyacrylic Acid ◽  
Composite Coatings ◽  
Chemical Deposition ◽  
Chemical Precipitation ◽  
Atomic Diffusion ◽  
Annealing Atmosphere ◽  
Conductive Coatings ◽  
Electrically Conductive Coatings ◽  
Acid Aqueous Solution ◽  
Screen Printed

A technique for preparing electrically conductive coatings of Cu3BiS3 powder in polyacrylic acid matrix is presented. Bi2S3 powder obtained by chemical precipitation was introduced into a freshly prepared CuS chemical deposition bath. After the initial nucleation period, CuS started to deposit on the Bi2S3 surface. The as-obtained CuS–Bi2S3 powder was mixed with polyacrylic acid aqueous solution, and the resulting mixture was used as a paste to form a screen-printed composite coating. Up to 200 °C the film behaves like a simple CuS film; the sheet resistance is around 100 and the crystallized phase in the composite is CuS (Covellite). When the temperature is equal or higher than 250 °C, atomic diffusion at the CuS–Bi2S3 interface is promoted, leading to the formation of the ternary compound Cu3BiS3 (Wittichenite) in the composite film. The formation of the compound depends on the temperature, relative abundance of the Bi2S3 and CuS components in the CuS–Bi2S3 pigment, as well as on the annealing atmosphere.

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