Abstract
Silicon nitride matrix composites containing particles of SiC, TiC, and BN were fabricated and tested for improved contact damage resistance at 900° C in an oxidizing atmosphere. Contact damage resistance was characterized with profilometry, scanning electron microscopy, bend tests, and coefficient of friction measurements. The results of these tests indicated that composites containing TiC particles showed dramatically improved friction and wear behaviour compared to the SiC- and BN-containing composites, as well as the monolithic Si3N4. Auger spectroscopy indicated that the improved behaviour was due to the formation of a lubricious oxide containing both titanium and silicon on the surface of the composite and the transfer of some of the oxide to the rider.
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Page, R.A., Blanchard-Ardid, C.R. & Wei, W. Effect of particulate additions on the contact damage resistance of hot-pressed Si3N4 . J Mater Sci 23, 946–957 (1988). https://doi.org/10.1007/BF01153994
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DOI: https://doi.org/10.1007/BF01153994