Abstract
The Vickers hardness of α-Si3N4 is higher than that of β-Si3N4. The erosive wear caused by solid particle impingement was tested for a series of hot pressed Si3N4 ceramics with different phase contents of Si3N4. The anti-erosive wear property of Si3N4 including α-phase was inferior to that of 100% β-Si3N4. The poor anti-erosive wear of Si3N4 including α-phase is due to its low fracture toughness (Kc) in spite of its high hardness (H). The erosion rate (V) of hot pressed Si3N4 is related to H and Kc by the equation V=e8.76H-0.27Kc-7.1, derived from multiple regression analysis.
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