Bang Seong-Sik, Park Young-Chul, Lee Ji-Woon, Hyun Soong-Keun, Kim Tae-Bum, Lee Jae-Kwon, Han Jung-Woo, Jung Taek-Kyun
Department of Materials Engineering, Inha University, Incheon 22212, Republic of Korea.
Korea Institute of Industrial Technology, 7-47, Songdo-dong, Yeonsu-gu, 406-840, Republic of Korea.
J Nanosci Nanotechnol. 2018 Mar 1;18(3):1931-1934. doi: 10.1166/jnn.2018.14990.
In this study influence of spray distance on the properties of WC-12Co coatings deposited by HVOF was investigated. WC-12Co coating was sprayed at spray distance of 300, 385 and 450 mm. From microstructure observation, it is confirmed that the porosity of coatings increases with increasing the spray distance. The X-ray diffraction patterns indicate that the coatings consist of pure WC, W, and Co as well as W2C and Co6W6C phases. The increase of the spray distance accelerated the decarburization of coatings. From micro hardness tests, it was found that the hardness and the fracture toughness decreased with increasing spray distance. These mechanical properties would be related with not only porosity but also the degree of decarburization.
本研究考察了喷涂距离对采用高速火焰喷涂（HVOF）制备的WC-12Co涂层性能的影响。WC-12Co涂层在300、385和450毫米的喷涂距离下进行喷涂。通过微观结构观察证实，涂层的孔隙率随喷涂距离的增加而增大。X射线衍射图谱表明，涂层由纯WC、W、Co以及W2C和Co6W6C相组成。喷涂距离的增加加速了涂层的脱碳。通过显微硬度测试发现，硬度和断裂韧性随喷涂距离的增加而降低。这些力学性能不仅与孔隙率有关，还与脱碳程度有关。
