Abstract
Sliding wear tests were carried out on different materials in air, water and oil at ambient temperatures by using a pin-on-ring tribometer. The tests in water and oil were run under conditions of boundary lubrication. The investigated ceramics could be divided into oxides (Al 2O 3, ZrO 2, Al 2TiO 5) and non-oxides (SiSiC). Steels with 0.2–0.9 wt.% C were heat treated to obtain spheroidized, normalized, and quenched and tempered structures. The steels and ceramics were studied with different metallic, ceramic and ceramic-metallic combinations. Scanning electron microscopy and energy-dispersive X-ray analysis revealed different wear mechanisms, depending on the materials and experimental conditions. Plastic deformation, material transfer, tribochemical reaction, grooving and microfracture were observed on the worn surfaces. The results show that ceramics may be more wear resistant than steels but their tribological behaviour is strongly influenced by operating conditions.
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