Schwingungsverschleiß von ungeschmeierten,faserkeramischen C/C-SiC-Gleitpaarungen

Unlubricated oscillating sliding wear of C/C-Sic fibre reinforced composites C/C-SiC fibre reinforced composites were produced by liquid infiltration technique. Porous C-fibre laminates containing carbonic resin were infiltrated with liquid silicon, leading to a SiC-matrix. Mechanical and thermal properties of the composites were measured. Tribological tests 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 relative humidity and testing temperature were varied. Microstructures of the composites as well as the worn surfaces were systematically analysed using scanning electron microscopy. Experimental results showed a significant influence of the relative humidity and the testing temperature on tribological properties. Self-lubricating effects due to carbon films occurred at sufficient humidity, contact temperatures < 90°C and below a critical surface pressure.