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

作　　者：Li, Wensheng  Zhang, Jie  Wang, Shucai  Dong, Hongfeng  Li, Yaming  Liu, Yi 

机构地区：[1]State Key Laboratory of AdvancedNon-Ferrous Materials, Lanzhou University of Technology, Lanzhou 730050, China [2]National Center for Advanced Tribology, School of Engineering Sciences, University of Southampton, Southampton SO171BJ,, UK

出　　处：《Rare Metals》2012年第1期81-87,共7页稀有金属（英文版）

基　　金：financially supported by Gansu Key Technology Project (No.090JKCA050);Gansu Outstanding Youth Foundation (No.201105)

摘　　要：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 co-balt-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 ℃ were 12.75%,2.72% and 156.38% higher than that of the matrix sintered at 740 ℃,respectively.Diamond graphitization was not occurred at 820 ℃.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.

关 键 词：Cu-Fe-Co based matrix sintering temperature GRAPHITIZATION microstructure mechanical properties 

分 类 号：TG146.11[一般工业技术—材料科学与工程]