WC-Ni核壳结构纳米复合粉体的制备与表征

摘要

采用球磨和离子热法制备了WC-Ni核壳结构纳米复合粉体( WC为核,Ni为壳)。采用XRD、SEM、EDS和TEM对所制备的样品进行了表征。 XRD结果显示,所制备的样品只有WC和Ni物相；SEM、EDS和TEM结果表明,所制备的样品中,WC呈不规则的球型,且Ni覆盖在WC颗粒表面,形成了WC-Ni核壳纳米结构。核WC颗粒的直径大约100 nm左右,壳Ni的厚度大约20 nm左右。这种核壳纳米结构的形成有利于后续WC-Ni硬质合金烧结过程中抑制WC晶粒的长大,为制备高强韧性的硬质合金奠定了实验基础。%WC/Ni core/shell nanocomposites were prepared by ball milling and ionothermal method ( WC as core, Ni as shell ) . The prepared samples were characterized by XRD, SEM, EDS and TEM. The XRD results showed that the prepared samples were only the WC and Ni phases. The SEM, EDS and TEM results showed that the prepared WC nanoparticles were spherical and irregular, coated by Ni nanoparticles and formed the WC-Ni core-shell nanostructures. The diameter of WC nanoparticles was about 100 nm and the thickness of the Ni nanoparticles was about 20 nm. Due to the formation of the core-shell nanostructures, the growth of the WC nanoparticles was inhibited in the WC-Ni cemented carbide sintering process. This has laid an experimental foundation for preparing cemented carbide with high strength and high toughness.