The effect of gas flow rate on structural, mechanical and antibacterial properties of atmospheric plasma sprayed Cu coatings

2021 ◽  
Author(s):  
Masoumeh Goudarzi ◽  
Hassan Ghaziasadi
Keyword(s):  
Flow Rate ◽  
Gas Flow ◽  
Antibacterial Properties ◽  
Atmospheric Plasma ◽  
Gas Flow Rate ◽  
Plasma Sprayed

Application of Taguchi Method for Optimization of Vacuum Plasma Sprayed CoNiCrAlY Coatings

2007 ◽  
Vol 124-126 ◽  
pp. 1549-1552
Author(s):  
Koo Hyun Lee ◽  
K.H. Ye ◽  
S.T. Kim ◽  
Chae Hong Jeon ◽  
Yo Seung Song ◽  
...  
Keyword(s):  
Taguchi Method ◽  
Flow Rate ◽  
Gas Flow ◽  
Vacuum Plasma Spray ◽  
Gas Flow Rate ◽  
Working Pressure ◽  
Carrier Gas ◽  
Vacuum Plasma ◽  
Plasma Sprayed ◽  
Carrier Gas Flow

Bond coatings, CoNiCrAlY, are prepared on Inconel 738 substrate by vacuum plasma spray (VPS). Mechanical properties of VPSed CoNiCrAlY coatings are investigated via Taguchi method and L18(21×37)orthogonal arrays to determine the optimal setting and the relationship of experimental variables. Seven parameters were considered as follows: (A) arc current; (B) primary gas flow rate; (C) secondary gas flow rate; (D) stand-off distance; (E) working pressure; (F) carrier gas flow rate (Ar); and (G) powder feeding rate.The effect of carrier gas flow rate on the porosity is determined to be the highest among the parameters investigated. Higher microhardness values are observed for the VPSed coatings as compared to the coatings prepared by conventional high velocity oxygen fuel probably due to low amount of the porosity.

Evaluation of Solid Lubricant Coatings for Low Friction and Wear Resistance Using the Atmospheric Plasma Spray

2004 ◽  
Vol 449-452 ◽  
pp. 777-780 ◽  
Author(s):  
Chang Min Han ◽  
Han Shin Choi ◽  
Chang Hee Lee ◽  
Hyung Jun Kim ◽  
S.Y. Hwang
Keyword(s):  
Flow Rate ◽  
Friction And Wear ◽  
Gas Flow ◽  
Plasma Jet ◽  
Hydrogen Gas ◽  
Atmospheric Plasma ◽  
Dry Sliding Wear ◽  
Coating Properties ◽  
Gas Flow Rate ◽  
Jet Characteristics

A blended NiCr-Cr2O3-Ag-BaF2/CaF2 feedstock was sprayed using an atmospheric plasma spraying process. Due to the differences in physical and thermophysical properties of each constituent, coating microstructures and resulting coating properties were largely dependent on the interactions between each constituent phase and plasma jet in view of the physics of thermal spraying. Thus, hydrogen gas flow rate was changed to affect the plasma jet characteristics such as gas enthalpy and gas thermal conductivity in this study. According to it, evolutions of chemical composition and microstructures of the as-sprayed coatings were observed. As the hydrogen gas flow rate was increased, Cr2O3 weight fraction was increased with the decrease of Ag and porosity. Vickers microhardness and bond strength of the coatings showed consistent behaviors to the phase composition and microstructures. Friction coefficient and weight loss during a pin-on-disc dry sliding wear test were measured from room temperature to 500°C at the interval of 100°C. Finally, the effects of phase fraction and coating properties on the friction and wear were investigated.

A Taguchi Design Study for Optimisation of Plasma Sprayed Hydroxyapatite Coatings

2013 ◽  
Vol 773-774 ◽  
pp. 590-601
Author(s):  
Md Fahad Hasan ◽  
James Wang ◽  
Christopher C. Berndt
Keyword(s):  
Surface Roughness ◽  
Process Parameters ◽  
Flow Rate ◽  
Feed Rate ◽  
Gas Flow ◽  
Deposition Efficiency ◽  
Gas Flow Rate ◽  
Powder Feed Rate ◽  
Hydroxyapatite Coatings ◽  
Plasma Sprayed

Plasma sprayed hydroxyapatite coatings were deposited onto mild steel substrates. A Taguchi L9design of experiment protocol was used to optimise the coating process parameters. The effect of three factors: (i) power and secondary gas flow rate (X1), (ii) powder feed rate and carrier gas flow rate (X2), and (iii) stand-off distance (X3) on the coating responses was studied. The responses of the plasma sprayed hydroxyapatite coatings were evaluated in terms of porosity, deposition efficiency, microhardness, crystallinity, and surface roughness. A regression analysis established relationships between process parameters and responses. Higher power, lower powder feed rate and the middle stand-off distance of 11 cm lead to optimum attributes of low porosity, high deposition efficiency, high microhardness, high crystallinity, and high surface roughness.

scholarly journals Characteristics of Plasma Discharge according to the Gas-flow Rate in the Atmospheric Plasma Jets

2013 ◽  
Vol 22 (3) ◽  
pp. 111-118
Author(s):  
Won Young Lee ◽  
Dong Jun Jin ◽  
Yun Jung Kim ◽  
Gook Hee Han ◽  
Hong Keun Yu ◽  
...  
Keyword(s):  
Flow Rate ◽  
Gas Flow ◽  
Plasma Discharge ◽  
Plasma Jets ◽  
Atmospheric Plasma ◽  
Gas Flow Rate

SCIENTIFIC AND ENGINEERING PRINCIPLES OF EFFICIENT FUEL USE AND ENVIRONMENTALLY FRIENDLY GAS COMBUSTION IN STOVE PLATES. PART 1. MODERN STATE-OF-THE-ART AND DIRECTIONS FOR IMPROVEMENT THE GAS BURNING IN DOMESTIC GAS COOKERS

2017 ◽  
pp. 3-18 ◽  
Author(s):  
B.S. Soroka ◽  
V.V. Horupa
Keyword(s):  
Natural Gas ◽  
Flow Rate ◽  
Gas Flow ◽  
Renewable Energy Sources ◽  
Combustion Process ◽  
Orifice Diameter ◽  
Firing Process ◽  
Gas Flow Rate ◽  
Gas Combustion ◽  
Gas Stoves

Natural gas NG consumption in industry and energy of Ukraine, in recent years falls down as a result of the crisis in the country’s economy, to a certain extent due to the introduction of renewable energy sources along with alternative technologies, while in the utility sector the consumption of fuel gas flow rate enhancing because of an increase the number of consumers. The natural gas is mostly using by domestic purpose for heating of premises and for cooking. These items of the gas utilization in Ukraine are already exceeding the NG consumption in industry. Cooking is proceeding directly in the living quarters, those usually do not meet the requirements of the Ukrainian norms DBN for the ventilation procedures. NG use in household gas stoves is of great importance from the standpoint of controlling the emissions of harmful components of combustion products along with maintenance the satisfactory energy efficiency characteristics of NG using. The main environment pollutants when burning the natural gas in gas stoves are including the nitrogen oxides NOx (to a greater extent — highly toxic NO2 component), carbon oxide CO, formaldehyde CH2O as well as hydrocarbons (unburned UHC and polyaromatic PAH). An overview of environmental documents to control CO and NOx emissions in comparison with the proper norms by USA, EU, Russian Federation, Australia and China, has been completed. The modern designs of the burners for gas stoves are considered along with defining the main characteristics: heat power, the natural gas flow rate, diameter of gas orifice, diameter and spacing the firing openings and other parameters. The modern physical and chemical principles of gas combustion by means of atmospheric ejection burners of gas cookers have been analyzed from the standpoints of combustion process stabilization and of ensuring the stability of flares. Among the factors of the firing process destabilization within the framework of analysis above mentioned, the following forms of unstable combustion/flame unstabilities have been considered: flashback, blow out or flame lifting, and the appearance of flame yellow tips. Bibl. 37, Fig. 11, Tab. 7.

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