Jonda Ewa, Łatka Leszek, Tomiczek Anna, Godzierz Marcin, Pakieła Wojciech, Nuckowski Paweł
Department of Engineering Materials and Biomaterials, Silesian University of Technology, 18a Konarskiego Str., 44100 Gliwice, Poland.
Department of Metal Forming, Welding and Metrology, Faculty of Mechanical Engineering, Wroclaw University of Science and Technology, 5 Łukasiewicza Str., 50371 Wroclaw, Poland.
Materials (Basel). 2021 Dec 22;15(1):40. doi: 10.3390/ma15010040.
In this paper, three commercial cermet powders, WC-Co-Cr, WC-Co and WC-CrC-Ni, were sprayed by the High Velocity Oxy Fuel (HVOF) method onto magnesium alloy AZ31 substrate. The coatings were investigated in terms of their microstructure, phase analysis and residual stress. The manufactured coatings were analyzed extensively using optical microscopy (OM), X-ray diffraction (XRD), scanning (SEM) and transmission electron microscopy (TEM). Based on microstructure studies, it was noted that the coatings show satisfactory homogeneity. XRD analysis shows that in WC-Co, WC-Co-Cr and WC-CrC-Ni coatings, main peaks are related to WC. Weaker peaks such as WC, CoW, Co and W for WC-Co and WC, CrC and CrC for WC-CrC-Ni also occur. In all cermet coatings, linear stress showed compressive nature. In WC-Co and WC-CrC-Ni, residual stress had a similar value, while in WC-Co-Cr, linear stress was lower. It was also proved that spraying onto magnesium substrate causes shear stress in the WC phase, most likely due to the low elastic modulus of magnesium alloy substrate.
在本文中，采用高速氧燃料（HVOF）喷涂方法将三种商用金属陶瓷粉末WC-Co-Cr、WC-Co和WC-CrC-Ni喷涂到镁合金AZ31基体上。对涂层的微观结构、相分析和残余应力进行了研究。使用光学显微镜（OM）、X射线衍射（XRD）、扫描电子显微镜（SEM）和透射电子显微镜（TEM）对制备的涂层进行了广泛分析。基于微观结构研究，发现涂层具有令人满意的均匀性。XRD分析表明，在WC-Co、WC-Co-Cr和WC-CrC-Ni涂层中，主要峰与WC相关。在WC-Co涂层中还出现了较弱的峰，如WC、CoW、Co和W，在WC-CrC-Ni涂层中出现了WC、CrC和CrC。在所有金属陶瓷涂层中，线应力均表现为压缩性质。在WC-Co和WC-CrC-Ni涂层中，残余应力值相似，而在WC-Co-Cr涂层中，线应力较低。还证明了喷涂到镁基体上会在WC相中引起剪切应力，这很可能是由于镁合金基体的低弹性模量所致。
