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首页> 外文会议>Conference on Abrasive Technology in China >Fabrication of WC-6Co-1.5Al (wt) Hardmetal by High Energy Milling and Electrical Current Sintering
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Fabrication of WC-6Co-1.5Al (wt) Hardmetal by High Energy Milling and Electrical Current Sintering

机译：通过高能铣削和电流烧结制造WC-6Co-1.5Al（WT％）硬质合金

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摘要

Ultrafine grain WC hardmetals were manufactured successfully from mixed powders of nominal composition of WC-6Co-1.5Al(wt%). To manufacture bulk ultrafine grain WC alloys, nanocrystalline WC powders as precursor were prepared for sintering from the mixed commercially available powders by high energy milling of 15 h. Then the electrical current sintering process of the milled powders was further studied. Experimental results showed that the density, hardness and transverse rupture strength of the sintered alloys reached 14.224 g/cm{sup}3, HRA 94 and 1660 MPa, respectively, by a appropriate coupling of pulse- and subsequent constant-current sintering and with the total sintering time of 6 min. It seemed difficult to obtain desirable sintered hardmetal by a single type of electric current sintering. However, the application of intensive pulse electric current was favorable to sintering, although it was difficult to achieve good WC alloys only by the pulse electric current sintering. A higher density WC alloy could be prepared by enlarging the electric current when only constant electric current was applied to sinter the milled powders. Unfortunately, the WC grains substantially coarsened concurrently so that the mechanical properties of the as sintered alloy decreased obviously.
机译：超细谷物WC硬质制品由WC-6Co-1.5Al（WT％）的标称组成的混合粉末成功制造。为了制造块状超细谷物WC合金，通过高能铣削15小时，制备纳米晶体WC粉末作为前体的烧结，用于烧结混合市售粉末。然后进一步研究碾磨粉末的电流烧结过程。实验结果表明，烧结合金的密度，硬度和横向断裂强度分别通过适当的脉冲和随后的恒流烧结和随后的恒流烧结和随后的恒定电流耦合达到14.224g / cm {sup} 3，HRA 94和1660MPa。总烧结时间为6分钟。通过单一类型的电流烧结，似乎难以获得理想的烧结硬物。然而，密集脉冲电流的应用有利于烧结，尽管难以通过脉冲电流烧结来实现良好的WC合金。当仅在施加恒定电流以烧结碾磨粉末时，通过扩大电流可以制备较高密度的WC合金。不幸的是，WC颗粒基本上同时粗化，使得当烧结合金的机械性能明显下降。

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