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在不同的冷喷温度条件下,采用冷喷涂技术制备含不同TiB_2陶瓷含量的Ni/Al-TiB_2涂层,其中Ni/Al-TiB_2喷涂粉末为机械混合制成。采用扫描电镜(SEM)表征Ni/Al-TiB_2粉末、冷喷涂层及热处理后涂层的形貌,通过X射线衍射技术(XRD)分析Ni/Al-TiB_2粉末和冷喷涂层物相结构,采用能谱分析仪对热处理后涂层成分元素进行分析。结果表明,冷喷涂层截面组织结构致密,孔隙率低,尤其是在冷喷温度为450℃条件下涂层孔隙率更低。冷喷涂层的物相与粉末相同,主要为TiB_2、Ni和Al三相。在650℃热处理10 h后涂层中孔隙率增加,涂层中原位生成了Ni Al3和Ni Al金属间化合物,并且涂层与基体界面之间生成了Fe Al3金属间化合物,从而提高了涂层与基体之间的结合力。
The Ni / Al-TiB 2 coatings with different contents of TiB 2 were prepared by cold spray technique at different cold spray temperatures. The Ni / Al-TiB 2 sprayed powders were mechanically mixed. The morphologies of Ni / Al-TiB 2 powder, cold sprayed coatings and heat-treated coatings were characterized by scanning electron microscopy (SEM). The phase structures of Ni / Al-TiB 2 powder and cold sprayed coatings were characterized by X-ray diffraction The energy spectrum analyzer analyzes the components of the coating after heat treatment. The results show that the cross-section of cold-sprayed coating has a dense microstructure and low porosity, especially when the cold spray temperature is 450 ℃. Cold sprayed coating phase and the same powder, mainly TiB_2, Ni and Al three phase. After heat treatment at 650 ℃ for 10 h, the porosity of the coating increases, Ni Al3 and NiAl intermetallic compounds are formed in situ in the coating, and Fe Al3 intermetallic compound is formed between the coating and the substrate interface, thereby improving the coating The bond with the substrate.