S. Bahadur et al., THE EFFECT OF ZINC AND COPPER OXIDES AND OTHER ZINC-COMPOUNDS AS FILLERS ON THE TRIBOLOGICAL BEHAVIOR OF THERMOSETTING POLYESTER, Wear, 203, 1997, pp. 464-473
The tribological behavior of thermosetting polyester filled with CuO,
ZnO, ZnF2, and Zn(C18H35O2)(2) fillers was studied. Sliding was perfor
med in ambient atmosphere at 1.0 m s(-1) between a polyester pin and a
hardened tool steel disk in a pin-on-disk machine. The worn and the u
nworn specimen pin surfaces, zinc stearate powder, and the transfer fi
lms formed during sliding were studied by X-ray photoelectron spectros
copy (XPS). It was found that the coefficients of friction of all the
filled composites were higher than that of the unfilled polyester. As
for wear, the wear rate of polyester filled with ZnO and ZnF2 increase
d while that of polyester filled with CuO and Zn(C18H35O2)(2) decrease
d. The reasons for these kinds of behavior were investigated. XPS resu
lts revealed that the Zn(C18H35O2)(2) filler decomposed during the sli
ding process while ZnO did not. It has been hypothesized that decompos
ition of the filler helps in bonding of the transfer film to the count
erface. The observed behavior is explained in terms of the topographic
al features, morphology and bonding of the transfer film to its counte
rface. (C) 1997 Elsevier Science S.A.