scholarly journals Lapisan Plasma Spray Ni-Al dan Al-Si Pada Tabung Baja Tahan Karat Austenitik Dengan Jarak Semprot Terbatas (Atmospheric Plasma Spray Coating of Ni-Al and Al-Si on Austenitic Stainless-Steel Tube with Limited Short Spray Distance)

Metalurgi ◽  
2021 ◽  
Vol 36 (2) ◽  
Author(s):  
Ahmad Sahid
Keyword(s):  
Stainless Steel ◽  
Bond Strength ◽  
Plasma Spray ◽  
Spray Coating ◽  
Atmospheric Plasma Spray ◽  
Atmospheric Plasma ◽  
Stainless Steel Tube ◽  
Spray Distance ◽  
Geometrical Condition

Atmospheric Plasma Spray (APS) coating is a widely used thermal spray coating process in industrial applications. High density and high bond strength coating are the main features of this process that is required in almost coating properties for specific applications. The geometrical condition of the workpiece substrate dictates the parameter needed to achieve a certain quality of the coating. Changes in the geometry require modification on the parameter of the process to maintain the quality of the coating. Aluminum Silicon and Nickel Aluminum coating were applied on Stainless Steel substrate casing. Due to the limitation of spray distance between nozzle gun and substrate surface of the casing, modified several parameters of the process were taken. Several parameters were investigated to find out the optimum result of coating and verified with tensile bond strength test, hardness test, and microscopic analysis examination. These activities that involved modification of parameters, mechanical testing, and visual inspection informed that power as a function of voltage and ampere, powder feed rate, the surface speed of substrate (the particular amount of workpiece rotation per minute), and traverse speed of gun, contribute to the result of the optimum coating.

scholarly journals The influence of powder feed rate on mechanical properties of atmospheric plasma spray (APS) Al-12Si coating

2019 ◽  
Vol 58 (1) ◽  
pp. 75-81
Author(s):  
Mihailo Mrdak ◽  
Bojan Medjo ◽  
Darko Veljić ◽  
Miodrag Arsić ◽  
Marko Rakin
Keyword(s):  
Mechanical Properties ◽  
Plasma Spray ◽  
Spray Coating ◽  
Fracture Morphology ◽  
Optical Microscope ◽  
Atmospheric Plasma Spray ◽  
Atmospheric Plasma ◽  
Powder Feed ◽  
Feed Control ◽  
Powder Particles

Abstract In this paper, structural and mechanical properties of APS - atmospheric plasma spray coating Al-12Si are presented. The aim of the research was the optimisation of the flow of powder to produce layers with optimal mechanical and structural properties that will be applied to the worn out parts of airplanes. Three groups of samples were produced, by utilising three powder feed rates: 30 g/min, 45 g/min and 60 g/min. Evaluation of layers’ microhardness was done using HV0.3 method and the bond strengthwas determined by testing of tensile strength. Surface morphology of the deposited powder particles was examined on SEM (Scanning Electron Microscope). The microstructure of the coating with the best measured mechanical properties was subsequently examined in etched condition on optical microscope and SEM (in accordance with the standard PN 585005, Pratt & Whitney). Also, fracture morphology of this coating in deposited state was examined using SEM. It was found that powder feed control with atmospheric plasma spraying can produce dense layers of Al-12Si coating with good bond strength.

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