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Abstract
High temperature wear performance of ultrafine and coarse grade Ti(CN)–WC–Ni cermets was investigated by surface profilometry, atomic force microscopy, and scanning electron microscopy to ascertain the contribution of particle size effect. The observed wear depths, produced during wear test, showed direct correlation with the surface roughness, which in turn is controlled by the microstructural features. The cermets with ultrafine Ti(CN) exhibit greater homogeneity along with a considerably higher rim fraction in the typical core-rim microstructure when compared to its coarse counterpart. The improved microstructure accounts for the enhanced tribological properties in the ultrafine cermets.
ACKNOWLEDGMENTS
This research was funded by the Basic Research Program of the Korea Research Foundation (KRF) vide Grant No. KRF-00-0422-E00133. One of the authors (JJ) is thankful to the Brain Korea fellowship (Ministry of Education, Republic of Korea) for financial support. A special thanks goes to Bayer Korea Ltd. (H.C. Starck GmbH) for the supply of Ti(CN) powders and to Prof. D. S. Lim at Korea Univ. in Seoul for the experimental assistance.