TY - JOUR
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
Y1 - 2010/6
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
UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/ezp_106118
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
SN - 0254-0584
VL - 123
SP - 114
EP - 120
JO - Materials Chemistry and Physics
JF - Materials Chemistry and Physics
IS - 1
ER -