Abstract Mo–MoSi2 functionally graded materials were prepared by a liquid phase siliconizing method. The microstructure, phase constitution, cross-section elemental distribution, grains size, and coating thickness of these materials were investigated with scanning electron microscopy (SEM), back scattered electron (BSE), energy dispersive spectroscope (EDS), glow discharge spectrum (GDS) and X–ray diffraction (XRD). The results indicate that the Mo–MoSi2 functionally graded materials have a dense multi-layer structure, mainly composed of surface layer (Si–MoSi2 layer, 1–10 µm), intermediate layer (MoSi2 layer, 22–40 µm), transitional layer (Mo5Si3 and Mo3Si layer, 2–3 µm) and Mo substrate. Moreover, the silicon concentration, grains size, and coating thickness increase gradually with the increasing temperature. The surfaces silicon concentrations are about 68–75 wt%, the average grains sizes of MoSi2 columnar crystals are about 7.1–9.4 µm, and the coating thicknesses are about 28–35 µm.

中文翻译：

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渗硅温度对Mo-MoSi 2 功能梯度材料微观结构和相组成的影响

摘要 采用液相渗硅法制备了 Mo-MoSi2 功能梯度材料。通过扫描电子显微镜 (SEM)、背散射电子 (BSE)、能谱仪 (EDS)、辉光放电光谱 (GDS) 研究了这些材料的微观结构、相组成、横截面元素分布、晶粒尺寸和涂层厚度。 ) 和 X 射线衍射 (XRD)。结果表明，Mo-MoSi2 功能梯度材料具有致密的多层结构，主要由表层（Si-MoSi2 层，1-10 µm）、中间层（MoSi2 层，22-40 µm）、过渡层组成。 （Mo5Si3 和 Mo3Si 层，2–3 µm）和 Mo 衬底。此外，随着温度的升高，硅浓度、晶粒尺寸和涂层厚度逐渐增加。