(1. 湖南大學(xué)材料科學(xué)與工程學(xué)院，長沙 410082；
2. 中國有色桂林礦產(chǎn)地質(zhì)研究院廣西超硬材料重點實驗室，
國家特種礦物材料工程技術(shù)研究中心，桂林 541004)
摘 要: 通過共沉淀法制備不同F(xiàn)e-Cu配比的FeCoCu預(yù)合金粉，并對其微觀結(jié)構(gòu)進行表征與分析。同時，對3種粉體進行不同溫度下的燒結(jié)實驗和對燒結(jié)試樣塊進行力學(xué)性能及磨損質(zhì)量損失進行測試，并對預(yù)合金粉與金剛石的界面結(jié)合情況進行探討。結(jié)果表明：預(yù)合金粉中形成了Co3Fe7、CoFe15.7、FeCu4等中間相，在一定程度上實現(xiàn)合金化。3種預(yù)合金粉末的形狀均為不規(guī)則狀，粉末顆粒較細，且相互連接，表面疏松，有利于燒結(jié)。3種預(yù)合金粉中單質(zhì)相仍占有較大比例，單質(zhì)配比對燒結(jié)體性能有重要影響。Fe含量增加時，試樣的理想燒結(jié)溫度及燒結(jié)體力學(xué)性能均升高。Fe-Cu配比會對微觀結(jié)構(gòu)產(chǎn)生重要影響，胎體對金剛石以機械包鑲為主，結(jié)合XRD及Raman光譜可知，與預(yù)合金粉燒結(jié)后的金剛石表面發(fā)生石墨化。
關(guān)鍵字: FeCoCu預(yù)合金粉；Fe-Cu配比；微觀結(jié)構(gòu)；燒結(jié)胎體；力學(xué)性能
（1. College of Materials Science and Engineering, Hunan University, Changsha 410082, China;
2. Guangxi Key Laboratory of Superhard Materials, Chinese National Engineering Research Center for Special Mineral Materials, China Nonferrous Metal (Guilin) Geology and Mining Co., Ltd., Guilin 541004, China）
Abstract:The FeCoCu pre-alloyed powders were manufactured by co-precipitation method. The microstructure was characterized, the sintering experiments were carried out, the mechanical properties and wear loss were tested and the combination condition between diamond and the powders was analyzed. The results show that the mesophases, such as Co3Fe7, CoFe15.7 and FeCu4, are formulated in the three powders, and all the powders have irregular shapes, interconnected fine particles and large surface areas. Although the solid solutions are formed, the sintering, mechanical properties and mass loss of the three powders are based on the Fe-Cu ratios. With Fe content increasing, the ideal sintering temperatures, hardness and three point bend strength raise. The relative density decreases, the wear loss becomes better. Fe-Cu ratio has important influence on the powders microstructure. The mechanical retention is the main strength in the matrix and graphitization has occurred in the diamond surface after sintering with the FeCoCu pre-alloyed powders.
Key words: FeCoCu pre-alloyed powders; Fe-Cu ratio; microstructure; matrix; mechanical property
