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Synergistic enhancing effect for mechanical and electrical properties of tungsten copper composites using spark plasma infiltrating sintering of copper-coated graphene

机译：铜包覆石墨烯的火花等离子体渗透烧结对钨铜复合材料力学和电学性能的协同增强作用

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Successful applications of WCu alloys in high voltage electrical switches require their high strength and excellent conductivity. Unfortunately, the strategies for increasing their strength such as doping with fine particles and alloying often significantly decrease their conductivity. In this paper, we developed a new pathway for fabricating WCu alloys using spark plasma infiltrating sintering of copper-coated graphene (Cu@Gr) composite powders. Cu@Gr was found to partially prevent the formation of WC after sintering, and graphene was uniformly distributed on the surfaces of network Cu phases. Electrical conductivity of 38.512 M·S/m, thermal conductivity of 264 W·m−1·K−1 and microhardness of 278 HV were achieved for the sintered WCu composites doped with only 0.8 wt.% Cu@Gr powders, which showed 95.3%, 24.3%, 28% enhancement compared with those from the conventional sintering using the undoped WCu powders.
机译：WCu合金在高压电气开关中的成功应用需要其高强度和出色的导电性。不幸的是，增加其强度的策略，例如掺杂细颗粒和合金化通常会大大降低其导电性。在本文中，我们开发了一种新的途径来制造WCu合金，该方法使用了覆铜石墨烯（Cu @ Gr）复合粉末的火花等离子体渗透烧结法。发现Cu @ Gr部分地防止了烧结后WC的形成，并且石墨烯均匀地分布在网络Cu相的表面上。掺烧的WCu复合材料的电导率为38.512 M·S / m，导热系数为264 W·m -1 ·K -1 和278HV仅使用0.8 wt。％的Cu @ Gr粉末，与使用未掺杂的WCu粉末的常规烧结相比，显示出95.3％，24.3％，28％的增强。

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