电流烧结制备W-4Ni-2Co-1Fe合金  

Fabrication of W-4Ni-2Co-1Fe alloy by electric current sintering

作　　者：李小强[1] 郑峰[1] 屈盛官[1] 李元元[1] 

机构地区：[1]华南理工大学机械工程学院,广州510640

出　　处：《粉末冶金材料科学与工程》2008年第2期102-105,共4页Materials Science and Engineering of Powder Metallurgy

基　　金：国家杰出青年科学基金资助项目(50325516);广东省自然科学基金资助项目(05300305);广东省科技项目(cgzhzd0502;2006B14601003)

摘　　要：对W-4Ni-2Co-1Fe高能球磨粉末,分别采用脉冲电流烧结+恒流电流烧结和恒流电流烧结两种工艺进行制备,研究电流烧结工艺对W-4Ni-2Co-1Fe合金性能的影响。结果表明:在脉冲电流基值、峰值、频率和占空比分别为360 A、3 000 A、50 Hz和50%,以及恒流电流为1.5 kA、总烧结时间为6 min、烧结压力为30 MPa的条件下,采用2 min脉冲+4 min恒流电流烧结工艺,合金的密度、硬度和抗弯强度分别达到最大值16.79 g/cm3、HRA84和484 MPa;与此烧结工艺相比,采用单一的恒流电流烧结时,通过增大恒流强度可进一步提高烧结密度,但同时合金的硬度和横向断裂强度均相对降低。The fabrication of W-4Ni-2Co-1Fe（mass fraction, %） alloy by electric current sintering using milled powders was studied. When the peak, base, repetition frequencies and duty ratio of the pulse electric current were prechosen as 3 000 A, 360 A, 50 Hz and 50%, at the same time constant current, sintering pressure and total sintering time were prechosen as 1 500 A, 30 MPa and 6 min, the alloy has optimal properties by sintering of 2 rain pulse electrical current and subsequent 4 min constant electrical current. The density, hardness and transverse rupture strength of the as sintered alloy are 16.79 g/cm^3, HRA84 and 484 MPa, respectively. In the case of single constant current applied to sinter milled powders, the sintered density can increase with intensifying the current, even being more than 16.79 g/cm^3. However, too intensive constant current reduces sintered density reversely. It has proved that the hardness and transverse rupture strength by single constant current sintering are lower than that by the sintefing of 2 min pulse- and 4 min constant current.

关 键 词：W-Ni-Co-Fe合金 电流烧结 硬度 横向断裂强度 

分 类 号：TF124[冶金工程—粉末冶金]