Characterizations and mechanical properties of impregnated diamond segment using Cu-Fe-Co metal matrix

Li, Wensheng, Zhan, Jie, Wang, Shucai, Dong, Hongfeng, Li, Yaming and Liu, Yi (2012) Characterizations and mechanical properties of impregnated diamond segment using Cu-Fe-Co metal matrix. Rare Metals, 31 (1), 81-87. (doi:10.1007/s12598-012-0467-x).

Abstract

Diamond impregnated Cu-Fe-Co based saw-blade segments are directly processed by vacuum and pressure-assisted sintering at different temperature, with the purpose of reducing the cobalt content in diamond tools. Copper and iron are used as the bonding elements and cobalt-chrome pre-alloyed powder is used as the hardening phase. Effects of sintering temperature on microstructures and mechanical properties of the sintered matrix and diamond graphitization were investigated by X-ray diffraction analysis, electron probe micro-analyzer, universal
testing machine, digital Rockwell hardness tester and Raman scattering analyzer. Results showed that microstructures of the sintered matrix were refined and porosities in the sintered matrix were closed to a more spherical-like shape with the increase of the sintering temperature. Densification, hardness and tensile strength of the matrix sintered at 820°C were 12.75%, 2.72% and 156.38% higher than that of the matrix sintered at 740°C, respectively. Diamond graphitization was not occurred at 820°C. The hardness and the tensile strength rose 32.8% and 13.5%, respectively, after 7.5 h ageing treatment. The matrix densification ascent and the dispersed distribution of Co-Cr pre-alloyed powders contributed a hardness improvement and a tensile strength improvement to the Cu-Fe based matrix.

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