各種窒化ケイ素球の摩耗特性

抄録

The ball-on-disk method was applied to measure the wear behavior of Si₃N₄ balls sliding on SiC disk at the load of 10kgf and velocity of 20cm/s. Four kinds of Si₃N₄ balls from different sources were named A, B, C, D, in increasing order of their hardness or fracture toughness. The large grain structure and large porosity of Si₃N₄ (A) will explain its low hardness and low fracture toughness. The fine fibrous structure without porosity of Si₃N₄ (D) may be the reason of its high hardness and high fracture toughness. The wear volume calculated from the wear scar on a Si₃N₄ ball sliding on the SiC disk was proportional to the weight loss and to the sliding distance. The wear of Si₃N₄ ball decreased with increasing hardness or fracture toughness, but on the contrary, the wear of SiC disk increased sharply. The Si₃N₄ (C) ball, which has crystallized grain boundary phases, showed very low wear of ball but high wear of SiC disk.