Ni包覆石墨烯增强WC-Co硬质合金的制备与性能  

Preparation and Properties of Electroless Ni-coated Graphene Reinforced WC-Co Cemented Carbides

作　　者：许星星 原一高[1] 张建国 XU Xingxing;YUAN Yigao;ZHANG Jianguo(College of Mechanical Engineering,Donghua University,Shanghai 201620,China)

机构地区：[1]东华大学机械工程学院,上海201620

出　　处：《东华大学学报（自然科学版）》2020年第6期946-951,共6页Journal of Donghua University(Natural Science)

基　　金：上海市自然科学基金资助项目(18ZR1401100);上海市联盟计划资助项目(LM201808)。

摘　　要：为改善石墨烯纳米片在WC-Co硬质合金中的分散性以及减小烧结过程中石墨烯的结构损伤,采用化学镀Ni的方法对石墨烯纳米片进行表面改性处理,对Ni包覆石墨烯的结构、成分和表面形貌进行表征,并研究了石墨烯质量分数对WC-Co硬质合金力学性能的影响。结果表明:石墨烯纳米片经化学镀Ni处理后,可在石墨烯表面获得一层包覆完整的纳米Ni粒子,这使得石墨烯能够均匀地分散在WC-Co粉末中;烧结过程中,在WC-Co硬质合金中添加Ni包覆石墨烯纳米片可增大WC的平均粒径;随Ni包覆石墨烯质量分数的增大,WC-Co硬质合金的硬度逐渐降低,断裂韧性呈先增强后减弱的趋势,当Ni包覆石墨烯质量分数为0.05%时,WC-Co硬质合金的断裂韧性达到最大值,为11.69 MPa·m 1/2。In order to improve the dispersibility of graphene nanosheets(GNS)in WC-Co cemented carbides and reduce the structural damage of graphene during sintering,the surface modification of GNS was carried out by electroless Ni plating.The structure,composition and surface morphology of graphene were characterized,and the effect of graphene mass fraction on the mechanical properties of WC-Co cemented carbide was investigated.The results show that the electroless Ni plating of GNS can obtain an intact layer of nano-nickel particles on the surface of graphene,so that graphene can be uniformly dispersed in WC-Co powder.During the sintering,the addition of Ni-coated GNS to the WC-Co cemented carbides increases the average particle sizes of the WC.With the increase of Ni-coated grapheme mass fraction,the hardness of WC-Co cemented carbide decreases gradually,and the fracture toughness first increases and then decreases.When the mass fraction of Ni-coated grapheme is 0.05%,the fracture toughness of WC-Co cemented carbide reaches a maximum of 11.69 MPa·m 1/2.

关 键 词：石墨烯 化学镀NI WC-CO硬质合金 力学性能 

分 类 号：TF123[冶金工程—粉末冶金]