Electrical discharge machining of ZrO2 toughened WC composites

Olivier Malek; Jef Vleugels; Yeczain Perez; Patrick De Baets; Junhu Liu; Sven Van den Berghe; Bert Lauwers

doi:10.1016/j.matchemphys.2010.03.069

Electrical discharge machining of ZrO2 toughened WC composites

Olivier Malek, Jef Vleugels, Yeczain Perez, Patrick De Baets, Junhu Liu, Sven Van den Berghe, Bert Lauwers

Research output › peer-review

Abstract

The interrelationships between the dispersion of the ZrO2 phase and the electrical discharge machining (EDM) behaviour of WC based composites with 0, 5 or 10 vol% of ZrO2 are investigated. Special attention was given to the homogeneity of the ultrafine WC – nanometric ZrO2 powder based composites which were fully densified by means of pulsed electric current sintering (PECS). X-ray photoelectron spectroscopy (XPS) measurements revealed the presence of a nanometricWO3 layer on the EDM surface, confirming oxidation as the major material removal mechanism (MRM). The surface roughness after the final EDM finishing regime was strongly influenced by the composite homogeneity and could be reduced down to 0.15m(Ra) on agglomerate-free composites. Residual stress measurements indicated thatEDM did not introduce a significant amount of surface stresses, especially not after the final finishing regime. XRD measurements of EDM surfaces however indicated surface depletion of ZrO2 by the formation of ZrC andW2C during spark erosion.

Original language	English
Pages (from-to)	114-120
Journal	Materials Chemistry and Physics
Volume	123
Issue number	1
DOIs	https://doi.org/10.1016/j.matchemphys.2010.03.069
State	Published - Jun 2010

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Cite this

@article{32643c050dc7400cb861fb23d7ca1a7e,

title = "Electrical discharge machining of ZrO2 toughened WC composites",

abstract = "The interrelationships between the dispersion of the ZrO2 phase and the electrical discharge machining (EDM) behaviour of WC based composites with 0, 5 or 10 vol% of ZrO2 are investigated. Special attention was given to the homogeneity of the ultrafine WC – nanometric ZrO2 powder based composites which were fully densified by means of pulsed electric current sintering (PECS). X-ray photoelectron spectroscopy (XPS) measurements revealed the presence of a nanometricWO3 layer on the EDM surface, confirming oxidation as the major material removal mechanism (MRM). The surface roughness after the final EDM finishing regime was strongly influenced by the composite homogeneity and could be reduced down to 0.15m(Ra) on agglomerate-free composites. Residual stress measurements indicated thatEDM did not introduce a significant amount of surface stresses, especially not after the final finishing regime. XRD measurements of EDM surfaces however indicated surface depletion of ZrO2 by the formation of ZrC andW2C during spark erosion.",

keywords = "Ceramics, electrical discharge machining, XPS, surface properties",

author = "Olivier Malek and Jef Vleugels and Yeczain Perez and {De Baets}, Patrick and Junhu Liu and {Van den Berghe}, Sven and Bert Lauwers",

note = "Score = 10",

year = "2010",

month = jun,

doi = "10.1016/j.matchemphys.2010.03.069",

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journal = "Materials Chemistry and Physics",

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T1 - Electrical discharge machining of ZrO2 toughened WC composites

AU - Malek, Olivier

AU - Vleugels, Jef

AU - Perez, Yeczain

AU - De Baets, Patrick

AU - Liu, Junhu

AU - Van den Berghe, Sven

AU - Lauwers, Bert

N1 - Score = 10

PY - 2010/6

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N2 - The interrelationships between the dispersion of the ZrO2 phase and the electrical discharge machining (EDM) behaviour of WC based composites with 0, 5 or 10 vol% of ZrO2 are investigated. Special attention was given to the homogeneity of the ultrafine WC – nanometric ZrO2 powder based composites which were fully densified by means of pulsed electric current sintering (PECS). X-ray photoelectron spectroscopy (XPS) measurements revealed the presence of a nanometricWO3 layer on the EDM surface, confirming oxidation as the major material removal mechanism (MRM). The surface roughness after the final EDM finishing regime was strongly influenced by the composite homogeneity and could be reduced down to 0.15m(Ra) on agglomerate-free composites. Residual stress measurements indicated thatEDM did not introduce a significant amount of surface stresses, especially not after the final finishing regime. XRD measurements of EDM surfaces however indicated surface depletion of ZrO2 by the formation of ZrC andW2C during spark erosion.

AB - The interrelationships between the dispersion of the ZrO2 phase and the electrical discharge machining (EDM) behaviour of WC based composites with 0, 5 or 10 vol% of ZrO2 are investigated. Special attention was given to the homogeneity of the ultrafine WC – nanometric ZrO2 powder based composites which were fully densified by means of pulsed electric current sintering (PECS). X-ray photoelectron spectroscopy (XPS) measurements revealed the presence of a nanometricWO3 layer on the EDM surface, confirming oxidation as the major material removal mechanism (MRM). The surface roughness after the final EDM finishing regime was strongly influenced by the composite homogeneity and could be reduced down to 0.15m(Ra) on agglomerate-free composites. Residual stress measurements indicated thatEDM did not introduce a significant amount of surface stresses, especially not after the final finishing regime. XRD measurements of EDM surfaces however indicated surface depletion of ZrO2 by the formation of ZrC andW2C during spark erosion.

KW - Ceramics

KW - electrical discharge machining

KW - XPS

KW - surface properties

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UR - http://knowledgecentre.sckcen.be/so2/bibref/7001

U2 - 10.1016/j.matchemphys.2010.03.069

DO - 10.1016/j.matchemphys.2010.03.069

M3 - Article

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JO - Materials Chemistry and Physics

JF - Materials Chemistry and Physics

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