Influence of Graphite Additives on Wear Properties of Hot Pressed Si_3N_4 Ceramics(Properties(structural and functional)<Special Issue>Guest Editors Dedicated to Prof. Gunter Petzow: Modern Trends in Advanced Ceramics)

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Two different groups of Si_3N_4 based composites were prepared within the present study. The first group consisting of materials containing SiC nanoinclusions in Si_3N_4 matrix, the second one with the same SiC/Si_3N_4 composition containing different size of graphite particles. Wet volume abrasive wear of these two groups of materials was studied. Wear mechanisms of the first group is mainly transgranular fracture. The dominant wear mechanism of second group is changed with the increased load from transgranular to the intergranular. Significant role plays the weak graphite/matrix interface. The pull-out of SiC/Si_3N_4 grain agglomerates from this area deteriorates a possible lubrication effect of graphite during the test. No significant benefit of the application of graphite particles in respect to the wear behavior was observed in the present study.
2006-11-01