B. Zimmerlin et al., UNLUBRICATED OSCILLATING SLIDING WEAR OF C C-SIC FIBER-REINFORCED COMPOSITES/, Materialwissenschaft und Werkstofftechnik, 25(11), 1994, pp. 442-450
C/C-SiC fibre reinforced composites were produced by liquid infiltrati
on technique. Porous C-fibre laminates containing carbonic resin were
infiltrated with liquid silicon, leading to a SiC-matrix. Mechanical a
nd thermal properties of the composites were measured. Tribological te
sts were carried out on self-mated C/C-SiC and C/C-SiC mated with ZrO2
and steel, respectively, in unlubricated oscillating sliding contact
using a ring-on-block tribometer. Environmental conditions such as rel
ative humidity and testing temperature were varied. Microstructures of
the composites as well as the worn surfaces were systematically analy
sed using scanning electron microscopy. Experimental results showed a
significant influence of the relative humidity and the testing tempera
ture on tribological properties. Self-lubricating effects due to carbo
n films occurred at sufficient humidity, contact temperatures < 90-deg
rees-C and below a critical surface pressure.