ぜい性材料の固体微粒子によるージョン(第7報) : セラミック工具の耐ージョン摩耗性

概要

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Ten kinds of commercial ceramic tools were eroded by SiC and Al_2O_3 abrasives with an average diameter of 500 pm at 250-300 m/s. These ten kinds of commercial ceramic tools were classified into four groups from matrices (Al_2O_3 or Si_3N_4) and additives present. The hardness of ceramic tool consisting of Al_2O_3 as the matrix and TiC as the main additive is 20-22 GPa (at a 20 kg load) , and the fracture toughness is 5.3-6.4 MPa・m^<1/2>. The erosive wear resistance of this type of Al_2O_3/ TiC composites was better than that of other three groups of ceramic tools, hot-pressed Si_3N_4, high purity Al_2O_3 and SiC whisker reinforced Al_2O_3, for both SiC and Al_2O_3 abrasives. The erosion rate of the ceramic tools was in the order of 10^<-3> cm^3/cm^3 for SiC abrasive and 10^<-4> cm^3/cm^3 for Al_2O_3 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.
社団法人日本セラミックス協会の論文
1988-03-01