Li Ju Ying, Mei Qing Song
School of Mechanical Engineering, Wuhan Polytechnic University, Wuhan 430023, China.
Department of Materials Engineering, School of Power and Mechanical Engineering, Wuhan University, Wuhan 430072, China.
Nanomaterials (Basel). 2016 Jun 1;6(6):101. doi: 10.3390/nano6060101.
TiAl₃ and TiN composite nanoparticles were continuously synthesized from Ti-48Al master alloy by hydrogen plasma-metal reaction in a N₂, H₂ and Ar atmosphere. The phase, morphology, and size of the nanoparticles were studied by X-ray diffraction (XRD) and transmission electronic microscopy (TEM). X-ray photoelectron spectroscopy (XPS) and evolved gas analysis (EGA) were used to analyze the surface phase constitution and oxygen content of the nanoparticles. The as-synthesized nanopowders were mainly composed of nearly spherical TiAl₃ and tetragonal TiN phases, with a mean diameter of ~42 nm and mass fractions of 49.1% and 24.3%, respectively. Passivation in the atmosphere of Ar and O₂ for 24 h at room temperature led to the formation of amorphous Al₂O₃ shells on the TiAl₃ particle surface, with a mean thickness of ~5.0 nm and a mass fraction of ~23.5%, as well as TiO₂ with a mass fraction of ~3.2%.
通过在氮气、氢气和氩气气氛中利用氢等离子体-金属反应，从Ti-48Al母合金中连续合成了TiAl₃和TiN复合纳米颗粒。通过X射线衍射（XRD）和透射电子显微镜（TEM）研究了纳米颗粒的相、形态和尺寸。采用X射线光电子能谱（XPS）和逸出气体分析（EGA）来分析纳米颗粒的表面相组成和氧含量。所合成的纳米粉末主要由近球形的TiAl₃和四方相的TiN相组成，平均直径约为42 nm，质量分数分别为49.1%和24.3%。在室温下于氩气和氧气气氛中钝化24小时导致在TiAl₃颗粒表面形成非晶态Al₂O₃壳层，平均厚度约为5.0 nm，质量分数约为23.5%，以及质量分数约为3.2%的TiO₂。
