Effect of pretreatment parameters on surface roughness and cobalt removal of tungsten carbide before diamond coating

Chemical vapor Deposition (CVD) is one of diamond synthesis process and it is widely applied to cutting tools to enhance wear resistance and increase tool life. The presence of excessive Co on the substrate of cemented tungsten carbide has a negative influence on the deposition diamond. Single step...

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Main Author:	Shirdar, Mostafa Rezazadeh
Format:	Thesis
Published:	2012
Subjects:	TJ Mechanical engineering and machinery
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spelling	my-utm-ep.307512020-08-30T08:08:18Z Effect of pretreatment parameters on surface roughness and cobalt removal of tungsten carbide before diamond coating 2012 Shirdar, Mostafa Rezazadeh TJ Mechanical engineering and machinery Chemical vapor Deposition (CVD) is one of diamond synthesis process and it is widely applied to cutting tools to enhance wear resistance and increase tool life. The presence of excessive Co on the substrate of cemented tungsten carbide has a negative influence on the deposition diamond. Single step pretreatment leading to both Co removal and the roughening of the substrate surface can improve adhesion levels of the diamond coatings deposited onto WC-Co substrates. The effect of cobalt content on the diamond adhesion on WC [6%Co] is well documented. However, very limited research has been reported on WC [12%Co]. In this present work, an attempt is made to study the effect of pretreatment parameters namely temperature and time on cobalt removal and surface roughness of WC [12%Co]. Full factorial experimental design followed by Response Surface Methodology (RSM) is employed in this study to plan and analyze the experiment. The surface roughness (Ry) and cobalt removal are the independent response variables. Empirical models are successfully developed to predict amount of cobalt removal and surface roughness of the substrate using both Genetic Algorithm (GA) and design of experiments (DOE) methods. Experimental results show that the temperature is the most significant factor followed by the etching time for predicted surface roughness (Ry). Whereas for interaction of time and temperature are not significant to influence Ry. In contrast time of etching is more significant than temperature for cobalt removal during pretreatment process. Moreover, interaction of time and temperature is also significant to influence cobalt removal 2012 Thesis http://eprints.utm.my/id/eprint/30751/ http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:91080?queryType=vitalDismax&query=Effect+of+pretreatment+parameters+on+surface+roughness+and+cobalt+removal+of+tungsten+carbide+before+diamond+coating masters Universiti Teknologi Malaysia, Faculty of Mechanical Engineering Faculty of Mechanical Engineering
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
topic	TJ Mechanical engineering and machinery
spellingShingle	TJ Mechanical engineering and machinery Shirdar, Mostafa Rezazadeh Effect of pretreatment parameters on surface roughness and cobalt removal of tungsten carbide before diamond coating
description	Chemical vapor Deposition (CVD) is one of diamond synthesis process and it is widely applied to cutting tools to enhance wear resistance and increase tool life. The presence of excessive Co on the substrate of cemented tungsten carbide has a negative influence on the deposition diamond. Single step pretreatment leading to both Co removal and the roughening of the substrate surface can improve adhesion levels of the diamond coatings deposited onto WC-Co substrates. The effect of cobalt content on the diamond adhesion on WC [6%Co] is well documented. However, very limited research has been reported on WC [12%Co]. In this present work, an attempt is made to study the effect of pretreatment parameters namely temperature and time on cobalt removal and surface roughness of WC [12%Co]. Full factorial experimental design followed by Response Surface Methodology (RSM) is employed in this study to plan and analyze the experiment. The surface roughness (Ry) and cobalt removal are the independent response variables. Empirical models are successfully developed to predict amount of cobalt removal and surface roughness of the substrate using both Genetic Algorithm (GA) and design of experiments (DOE) methods. Experimental results show that the temperature is the most significant factor followed by the etching time for predicted surface roughness (Ry). Whereas for interaction of time and temperature are not significant to influence Ry. In contrast time of etching is more significant than temperature for cobalt removal during pretreatment process. Moreover, interaction of time and temperature is also significant to influence cobalt removal
format	Thesis
qualification_level	Master's degree
author	Shirdar, Mostafa Rezazadeh
author_facet	Shirdar, Mostafa Rezazadeh
author_sort	Shirdar, Mostafa Rezazadeh
title	Effect of pretreatment parameters on surface roughness and cobalt removal of tungsten carbide before diamond coating
title_short	Effect of pretreatment parameters on surface roughness and cobalt removal of tungsten carbide before diamond coating
title_full	Effect of pretreatment parameters on surface roughness and cobalt removal of tungsten carbide before diamond coating
title_fullStr	Effect of pretreatment parameters on surface roughness and cobalt removal of tungsten carbide before diamond coating
title_full_unstemmed	Effect of pretreatment parameters on surface roughness and cobalt removal of tungsten carbide before diamond coating
title_sort	effect of pretreatment parameters on surface roughness and cobalt removal of tungsten carbide before diamond coating
granting_institution	Universiti Teknologi Malaysia, Faculty of Mechanical Engineering
granting_department	Faculty of Mechanical Engineering
publishDate	2012
_version_	1747815739475099648

Effect of pretreatment parameters on surface roughness and cobalt removal of tungsten carbide before diamond coating

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