The effect of process parameters of gas-dynamic spray on generation of brass-type coating structure

Ni–Al2O3 composite coatings were prepared with a modified Watt’s bath by using jet electrodeposition method. As the key process parameter, current density and the addition of Al2O3 nanoparticles in electrolyte were studied about the effect on the surface morphology and co-deposition of Al2O3 nanoparticles of composite coating. The mechanical and tribological properties of the composite coating were also tested. The results show that properly increasing the current density and Al2O3 addition can increase the co-deposition of nanoparticles in the coating and promote the formation of a dense and refined coating structure. Using the optimized process parameters of current density (300 A/dm2) and Al2O3 addition (30 g/L), the co-deposition of Al2O3 in the composite coating can reach a maximum of 13.1 at.%. The hardness of the coating reaches the peak at 623 HV. The wear rate of the composite coating is also greatly reduced with optimized parameters.

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Combination of electroforming and cold gas dynamic spray for fabrication of rotational moulds: feasibility study

The International Journal of Advanced Manufacturing Technology ◽

10.1007/s00170-014-6331-4 ◽

2014 ◽

Vol 76 (5-8) ◽

pp. 1243-1251 ◽

Cited By ~ 7

Author(s):

Fernando Ortega ◽

Alexey Sova ◽

Mario D. Monzón ◽

María D. Marrero ◽

Antonio N. Benítez ◽

...

Keyword(s):

Feasibility Study ◽

Gas Dynamic ◽

Cold Gas Dynamic Spray ◽

Gas Dynamic Spray ◽

Cold Gas

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Material Properties of Thick Aluminum Coating Made by Cold Gas Dynamic Spray Deposition

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.345-346.1097 ◽

2007 ◽

Vol 345-346 ◽

pp. 1097-1100

Author(s):

Jae Chul Lee ◽

Doo Man Chun ◽

Sung Hoon Ahn ◽

Caroline S. Lee

Keyword(s):

Electrical Resistivity ◽

Elastic Modulus ◽

Cold Spray ◽

Material Properties ◽

Gas Dynamic ◽

Macro Scale ◽

Cold Gas Dynamic Spray ◽

Gas Dynamic Spray ◽

Scale Deposition ◽

Cold Gas

Cold gas dynamic spray is a relatively new coating process by which coatings can be produced without significant heating during the process. Cold gas dynamic spray is conducted by powder sprayed using supersonic gas jet, and generally called the kinetic spray or cold spray. Its low process temperature can minimize the thermal stress and also reduce the deformation of the substrate. In this study, thick or macro scale deposition was studied while most researches on cold-spray have focused on micro scale coating. Measured material properties of macro scale deposition layer showed that elastic modulus and hardness were lower and electrical resistivity was higher than those of reference substrate material. The main causes of changed material properties were investigated by FE-SEM (Field Emission Scanning Electron Microscope) and EDS (Energy Dispersive X-ray Spectrometer) data. In this result, porous micro structure generated by imperfect plastic deformation might cause decrease in elastic modulus and hardness of the deposition layer by cold spray, and oxidized Al particles increased the electrical resistivity.

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1206 A NUMBERICAL STUDY OF SUPERSONIC POWDER-LADEN JET FLOW IN COLD GAS DYNAMIC SPRAY PROCESS

The Proceedings of the International Conference on Jets Wakes and Separated Flows (ICJWSF) ◽

10.1299/jsmeicjwsf.2013.4._1206-1_ ◽

2013 ◽

Vol 2013.4 (0) ◽

pp. _1206-1_-_1206-6_

Author(s):

HO C. Y. ◽

LEUNG R. C. K.

Keyword(s):

Jet Flow ◽

Spray Process ◽

Gas Dynamic ◽

Cold Gas Dynamic Spray ◽

Gas Dynamic Spray ◽

Cold Gas

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