A high-temperature ball-on-flat tribometer was used to investigate dry and oil-lubricated friction and wear of sintered Si3N4 and Si3N4/hexagonal boron nitride (H-BN) fibrous monoliths. The friction coefficients of base Si3N4 flats sliding against Si3N4 balls were in the range of 0.6–0.8 for dry and 0.03–0.15 for lubricated sliding, and the average wear rates of Si3N4 were ≈10−5 mm3 N−1 m−1 for dry sliding and ≈10−10–10−8 mm3 N −1m−1 for lubricated sliding. The friction coefficients of Si3N4 balls against composite fibrous monoliths were ≈0.7 for dry sliding and 0.01–0.08 for lubricated sliding. The average specific wear rates of the pairs were of the same order as those measured for the conventional Si3N4 pairs. However, the fibrous monoliths, in combination with sprayed dry boron nitride, resulted in reduction in the lubricated friction coefficients of the test pairs and significant reduction in their wear rates. The most striking result of this study was that the coefficients of friction of the Si3N4/H-BN fibrous monolith test pair were 70–80 lower than those of either roughened or polished Si3N4 when tests were performed under oil-lubricated sliding conditions over long distances (up to 5000 m). The results indicated that Si3N4/H-BN fibrous monoliths have good wear resistance and can be used to reduce friction under lubricated sliding conditions.
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Gutierrez-Mora, F., Erdemir, A., Goretta, K.C. et al. Dry and oil-lubricated sliding wear of Si3N4 and Si3N4/BN fibrous monoliths. Tribol Lett 18, 231–237 (2005). https://doi.org/10.1007/s11249-004-2747-6
- fibrous monoliths