Abstract
Ten kinds of commercial ceramic tools were eroded by SiC and Al2O3 abrasives with an average diameter of 500μm at 250-300m/s. These ten kinds of commercial ceramic tools were classified into four groups from matrices (Al2O3 or Si3N4) and additives present. The hardness of ceramic tool consisting of Al2O3 as the matrix and TiC as the main additive is 20-22GPa (at a 20kg load), and the fracture toughness is 5.3-6.4MPa·m1/2. The erosive wear resistance of this type of Al2O3/TiC composites was better than that of other three groups of ceramic tools, hot-pressed Si3N4, high purity Al2O3 and SiC whisker reinforced Al2O3, for both SiC and Al2O3 abrasives. The erosion rate of the ceramic tools was in the order of 10-3cm3/cm3 for SiC abrasive and 10-4cm3/cm3 for Al2O3 abrasive. The difference in erosion rate was caused by different erosion mechanisms depending on whether the Vickers hardness ratio of the ceramic tool to the abrasive is larger or smaller than unity.
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