TY - JOUR
T1 - Effect of transverse current injection on the tribological properties of WC cemented carbide
AU - Rapoport, L.
AU - Parkansky, N.
AU - Lapsker, I.
AU - Rayhel, A.
AU - Alterkop, B.
AU - Boxman, R. L.
AU - Goldsmith, S.
AU - Burstain, L.
PY - 2001/4
Y1 - 2001/4
N2 - The effect of an electric current on the tribological properties of WC cemented carbide were studied. Cemented carbide bars having a composition of 90% WC, 8% Co, 1.8% TaC, 0.2% NbC with dimensions of 5 x 6.5 x 20 mm were mounted in a sclerometer. A d.c. current with densities in the range of 0-90° A/cm2 was injected parallel to the long axis of the bar during the test. The surfaces were examined by scanning electron microscopy, and by X-ray photoelectron spectroscopy. To measure wear and friction, an indenter with loads of 1.5 and 3.5 N was drawn over the surface of the test sample with a controlled velocity of 0.2 mm/s for 100 cycles. It was found that the scratching process fractured the carbide grains. The fractured carbides were agglomerated and compacted, forming a thick tribo film. Tungsten oxide WO3 was found in the scratch track after scratching with current injection. With the injected current of 90 A/cm2 the track width increased by a factor of 1.4 and 3 and the friction coefficient increased by a factor of 1.5 and 2 with a load of 1.5 and 3.5 N, respectively, as compared to scratching without a current.
AB - The effect of an electric current on the tribological properties of WC cemented carbide were studied. Cemented carbide bars having a composition of 90% WC, 8% Co, 1.8% TaC, 0.2% NbC with dimensions of 5 x 6.5 x 20 mm were mounted in a sclerometer. A d.c. current with densities in the range of 0-90° A/cm2 was injected parallel to the long axis of the bar during the test. The surfaces were examined by scanning electron microscopy, and by X-ray photoelectron spectroscopy. To measure wear and friction, an indenter with loads of 1.5 and 3.5 N was drawn over the surface of the test sample with a controlled velocity of 0.2 mm/s for 100 cycles. It was found that the scratching process fractured the carbide grains. The fractured carbides were agglomerated and compacted, forming a thick tribo film. Tungsten oxide WO3 was found in the scratch track after scratching with current injection. With the injected current of 90 A/cm2 the track width increased by a factor of 1.4 and 3 and the friction coefficient increased by a factor of 1.5 and 2 with a load of 1.5 and 3.5 N, respectively, as compared to scratching without a current.
KW - Transverse current injection
KW - Tribological properties
KW - WC cemented carbide
UR - http://www.scopus.com/inward/record.url?scp=0035308956&partnerID=8YFLogxK
U2 - 10.1016/S0043-1648(00)00496-8
DO - 10.1016/S0043-1648(00)00496-8
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AN - SCOPUS:0035308956
SN - 0043-1648
VL - 249
SP - 1
EP - 5
JO - Wear
JF - Wear
IS - 1-2
ER -