Effect of two-step pretreatment on cobalt contents and surface roughness of tungsten carbide substrate prior to diamond coating

Cemented tungsten carbide is the most widely used material for cutting tools. Due to extreme demands higher tool life several types of coating have been introduced to prolong the service time which include diamond coating. However cobalt binder in tungsten carbide prevents diamond to adhere well on...

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Main Author:	Safari, Habiballah
Format:	Thesis
Language:	English
Published:	2010
Subjects:	TJ Mechanical engineering and machinery TS Manufactures
Online Access:	http://eprints.utm.my/id/eprint/12537/4/HabiballahSafariMFKM2010.pdf
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id	my-utm-ep.12537
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spelling	my-utm-ep.125372017-09-19T06:21:02Z Effect of two-step pretreatment on cobalt contents and surface roughness of tungsten carbide substrate prior to diamond coating 2010-12 Safari, Habiballah TJ Mechanical engineering and machinery TS Manufactures Cemented tungsten carbide is the most widely used material for cutting tools. Due to extreme demands higher tool life several types of coating have been introduced to prolong the service time which include diamond coating. However cobalt binder in tungsten carbide prevents diamond to adhere well on the substrate and its content at the outer surface should be reduce to below 1%. Single step and two-step pretreatments have been studied by many researchers. But to date poor adhesion of diamond coating still an issue. In this work a two-step pretreatment was used to etch tungsten carbide with 6% cobalt (WC-6% Co) at the surface of the substrate in order to solve poor adhesion problem. First step with Murakami's reagent (2, 3, 6, and 20 minutes) and the second step of the process were carried out by etching in a solution of hydrochloric acid (30, 45, and 60 seconds) or a solution of sulfuric acid (10 seconds). The effect of them on Co cemented tungsten carbide samples in term of surface morphology, surface roughness, and cobalt removal from the surface were examined. It is found the longer Murakami etching time produces a slightly rougher surface than the shorter exposing time. Both acid solutions were used in the second pretreatment step able to reduce cobalt content to below 1% at all conditions regardless of etching time. The best combination of pretreatment process is 20 minutes Murakami etching and 45 seconds exposure time of hydrochloric acid that yields the higher surface roughness and the lowest cobalt content on the substrate surface. 2010-12 Thesis http://eprints.utm.my/id/eprint/12537/ http://eprints.utm.my/id/eprint/12537/4/HabiballahSafariMFKM2010.pdf application/pdf en public masters Universiti Teknologi Malaysia, Faculty of Mechanical Engineering Faculty of Mechanical Engineering
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	TJ Mechanical engineering and machinery TS Manufactures
spellingShingle	TJ Mechanical engineering and machinery TS Manufactures Safari, Habiballah Effect of two-step pretreatment on cobalt contents and surface roughness of tungsten carbide substrate prior to diamond coating
description	Cemented tungsten carbide is the most widely used material for cutting tools. Due to extreme demands higher tool life several types of coating have been introduced to prolong the service time which include diamond coating. However cobalt binder in tungsten carbide prevents diamond to adhere well on the substrate and its content at the outer surface should be reduce to below 1%. Single step and two-step pretreatments have been studied by many researchers. But to date poor adhesion of diamond coating still an issue. In this work a two-step pretreatment was used to etch tungsten carbide with 6% cobalt (WC-6% Co) at the surface of the substrate in order to solve poor adhesion problem. First step with Murakami's reagent (2, 3, 6, and 20 minutes) and the second step of the process were carried out by etching in a solution of hydrochloric acid (30, 45, and 60 seconds) or a solution of sulfuric acid (10 seconds). The effect of them on Co cemented tungsten carbide samples in term of surface morphology, surface roughness, and cobalt removal from the surface were examined. It is found the longer Murakami etching time produces a slightly rougher surface than the shorter exposing time. Both acid solutions were used in the second pretreatment step able to reduce cobalt content to below 1% at all conditions regardless of etching time. The best combination of pretreatment process is 20 minutes Murakami etching and 45 seconds exposure time of hydrochloric acid that yields the higher surface roughness and the lowest cobalt content on the substrate surface.
format	Thesis
qualification_level	Master's degree
author	Safari, Habiballah
author_facet	Safari, Habiballah
author_sort	Safari, Habiballah
title	Effect of two-step pretreatment on cobalt contents and surface roughness of tungsten carbide substrate prior to diamond coating
title_short	Effect of two-step pretreatment on cobalt contents and surface roughness of tungsten carbide substrate prior to diamond coating
title_full	Effect of two-step pretreatment on cobalt contents and surface roughness of tungsten carbide substrate prior to diamond coating
title_fullStr	Effect of two-step pretreatment on cobalt contents and surface roughness of tungsten carbide substrate prior to diamond coating
title_full_unstemmed	Effect of two-step pretreatment on cobalt contents and surface roughness of tungsten carbide substrate prior to diamond coating
title_sort	effect of two-step pretreatment on cobalt contents and surface roughness of tungsten carbide substrate prior to diamond coating
granting_institution	Universiti Teknologi Malaysia, Faculty of Mechanical Engineering
granting_department	Faculty of Mechanical Engineering
publishDate	2010
url	http://eprints.utm.my/id/eprint/12537/4/HabiballahSafariMFKM2010.pdf
_version_	1747814939143176192

Effect of two-step pretreatment on cobalt contents and surface roughness of tungsten carbide substrate prior to diamond coating

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