Numerical Modelling for Oblique Impacts With Ductile Material Particle Erosion During Cold Gas Dynamic Spray

2020 ◽  
Author(s):  
Sunday Temitope Oyinbo ◽  
Tien-Chien Jen ◽  
Samson A. Aasa
Keyword(s):  
Contact Angle ◽  
Numerical Modelling ◽  
Gas Flow ◽  
Deposition Efficiency ◽  
Ductile Material ◽  
Material Particle ◽  
Gas Dynamic ◽  
Cold Gas Dynamic Spray ◽  
Gas Dynamic Spray ◽  
Cold Gas

Abstract Another key parameter that affects the coating deposition efficiency of cold gas dynamic spray technology is the contact angle. The particle tangential sliding on the substrate at impact is due to the gas flow bow shock at a supersonic velocity which is liable for the erosion at the surface of the substrate. This study presented a finite element approach of a numerical model to investigate the profile of the deformed sprayed particles under the condition of oblique impact and the erosion mechanism for solid particle impact on ductile material during Cold Gas Dynamic spray. In the numerical modelling of cold gas dynamic spray (CGDS) by a Lagrangian approach that was developed, oblique erodent particle on the substrate at controlled contact angle (10°–90°), velocity (500 m/s) and friction coefficient (0.3) was simulated. It was discovered that in the substrate, the crater depth decreases as well as the area of contact between the substrate and the deformed particles when the contact angle increases at the same impacting conditions. The material removal and crack formation mechanism were also simulated successfully by the accumulation of residual strain that resulted in the dynamic detachment of material elements at the surface as they fail.

The Effects of Optimized Nozzle-Substrate Distance on Cold Gas Dynamic Spray (CGDS) Process

2010 ◽  
Author(s):  
Yi-Hsin Yen ◽  
Sung-Cheng Wong ◽  
Tien-Chien Jen ◽  
Qinghua Chen ◽  
Quan Liao
Keyword(s):  
Particle Size ◽  
Gas Flow ◽  
Aluminum Substrate ◽  
Coating Quality ◽  
Carrier Gas ◽  
Substrate Distance ◽  
Gas Dynamic ◽  
Cold Gas Dynamic Spray ◽  
Gas Dynamic Spray ◽  
Cold Gas

This paper presents research that is focused on the particle coating quality of Cold Gas Dynamic Spray (CGDS) process. The coating quality is affected by several different factors, namely the carrier gas species, nozzle-substrate distance, nozzle inlet pressure and the coating particle size. The intent of this research is to use numerical simulations to predict the coating quality and to find the optimized nozzle-substrate distance and particle size in CGDS process by tuning the factor of nozzle-substrate distance and the coating particle size. Air was chosen as the carrier gas to accelerate copper (Cu) particles, which have diameters ranging from 2–50μm.. There are two main target factors, the nozzle-substrate distance and particle size, which are going to affect the coating quality in this study. In the first part, 14 sets of nozzle-substrate distance models ranging from 2.5mm to 100 mm were setup to study the air velocity, density, temperature and pressure contour through the De-Laval nozzle to the aluminum substrate. In the second part, 49 sets of different particle sizes ranging from 2–50μm in diameter were computed. The particle’s impact velocities on the aluminum substrate were applied to 12 different nozzle-substrate distance models. The bow shock wave, a high pressure gradient region, formed in front of the aluminum substrate, makes the copper particles decelerate in front of the substrate. The results showed that the gas flow velocity contours was affected by different nozzle-substrate distances, which caused different particle accelerating characteristics.

Thin Film Coatings of WO3 by Cold Gas Dynamic Spray: A Technical Note

2005 ◽  
Vol 14 (2) ◽  
pp. 183-186 ◽  
Author(s):  
Ha Yong Lee ◽  
Young Ho Yu ◽  
Young Cheol Lee ◽  
Young Pyo Hong ◽  
Kyung Hyun Ko
Keyword(s):  
Thin Film ◽  
Technical Note ◽  
Film Coatings ◽  
Thin Film Coatings ◽  
Gas Dynamic ◽  
Cold Gas Dynamic Spray ◽  
Gas Dynamic Spray ◽  
Cold Gas

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

2014 ◽  
Vol 76 (5-8) ◽  
pp. 1243-1251 ◽  
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

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

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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