B_4C系セラミックスの微構造が機械特性と***ージョン摩耗に及ぼす影響

概要

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Monolithic B_4C and B_4C-20 mol% CrB_2 composite ceramics were fabricated by hot pressing at 1900 and 2050℃. Erosive wear by Al_2O_3 particle impingement was tested using a sandblaster. The microstructure, mechanical properties and erosive wear of the ceramic specimens were examined and compared with those of a commercial B_4C ceramic. Monolithic B_4C and B_4C-CrB_2 composite specimens exhibited the high flexural strength of more than 600 MPa, which was attributed to their fine grained and uniform microstructure. Furthermore, a low erosive wear rate was obtained for these specimens compared with a commercial B_4C ceramic. In particular, the fracture toughness of the composite specimen hot-pressed at 1900℃ was improved from 2.48 to 3.50 MPa・m^1/2 by the addition of CrB_2, and exhibited the highest resistance to erosion. Erosive wear occurred by the removal of the B_4C particles. The experimental results could be described by the equation V^ocdE/Kc^2, as theoretically proposed by Ritter.
社団法人日本セラミックス協会の論文
2003-01-01