Huang Boyuan, Song Chunyan, Liu Yang, Gui Yongliang
School of Materials Science and Engineering, Southwest Petroleum University, Chengdu 610500, China.
School of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063009, China.
Materials (Basel). 2017 Feb 4;10(2):130. doi: 10.3390/ma10020130.
Intermetallic compounds have been studied for their potential application as structural wear materials or coatings on engineering steels. In the present work, a newly designed intermetallic composite in a Ni-Mo-Si system was fabricated by arc-melting process with commercially pure metal powders as starting materials. The chemical composition of this intermetallic composite is 45Ni-40Mo-15Si (at %), selected according to the ternary alloy diagram. The microstructure was characterized using optical microscopy (OM), scanning electron microscopy (SEM), X-ray diffraction (XRD), and energy dispersive spectroscopy (EDS), and the wear-resistant properties at room temperature were evaluated under different wear test conditions. Microstructure characterization showed that the composite has a dense and uniform microstructure. XRD results showed that the intermetallic composite is constituted by a binary intermetallic compound NiMo and a ternary Mo₂Ni₃Si metal silicide phase. Wear test results indicated that the intermetallic composite has an excellent wear-resistance at room-temperature, which is attributed to the high hardness and strong atomic bonding of constituent phases NiMo and Mo₂Ni₃Si.
金属间化合物因其作为结构耐磨材料或工程钢涂层的潜在应用而受到研究。在本工作中，以商业纯金属粉末为原料，通过电弧熔炼工艺制备了一种新设计的Ni-Mo-Si系金属间化合物复合材料。根据三元合金相图，该金属间化合物复合材料的化学成分选为45Ni-40Mo-15Si（原子百分比）。采用光学显微镜（OM）、扫描电子显微镜（SEM）、X射线衍射（XRD）和能谱仪（EDS）对微观结构进行表征，并在不同磨损试验条件下评估其室温耐磨性能。微观结构表征表明，该复合材料具有致密且均匀的微观结构。XRD结果表明，该金属间化合物复合材料由二元金属间化合物NiMo和三元金属硅化物相Mo₂Ni₃Si组成。磨损试验结果表明，该金属间化合物复合材料在室温下具有优异的耐磨性能，这归因于组成相NiMo和Mo₂Ni₃Si的高硬度和强原子键。
