Preparation of spherical WC-Co powder by spray granulation combined with radio frequency induction plasma spheroidization |
| |
| Affiliation: | 1. School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450001, China;2. School of Material Science and Engineering, Henan University of Technology, Zhengzhou, 450001, China;1. Department of Chemical, Metallurgical and Materials Engineering, Tshwane University of Technology, P.M.B. X680, Pretoria, South Africa;2. Surface Engineering Research Laboratory, Tshwane University of Technology, P.M.B. X680, Pretoria, South Africa;3. Department of Electrical Engineering, Tshwane University of Technology, P.M.B. X680, Pretoria, South Africa;1. Department of Physics, Govt. General Degree College, Salboni, Paschim Medinipur, 721516, India;2. Department of Physics, The University of Burdwan, Burdwan, 713104, India;1. School of Physics and Materials Science, Nanchang University, Nanchang, 330000, PR China;2. Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou, 341000, PR China;3. Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, 350002, PR China |
| |
| Abstract: | In this paper, spray granulation and radio frequency plasma spheroidization were used to obtain spherical WC-Co powder for laser powder bed fusion from mixed WC and Co powder. The effects of solid content and polyvinyl alcohol content of the slurry on granulated powder were studied. Then the spheroidization effects of different granulated WC-Co powders were investigated and compared. Results show that the granulated powder obtained from the slurry with solid content of 65 wt% and polyvinyl alcohol content of 2.5 wt% has the best performance after plasma spheroidization, whose flowability and apparent density are 10.20 s/50g and 6.76 g/cm3, respectively. Moreover, W and C distribute uniformly in the spheroidized WC-Co powder while the Co element is mainly distributed in the gaps of tungsten carbide. It is also noted that W2C, free carbon and Co3W3C appear in the spheroidized WC-Co powders due to the decomposition of WC during the plasma spheroidization process. Furthermore, the decomposition of WC-Co powder particles with smaller size is more serious, which leads to the presence of black and white particles with significantly different carbon content distribution in the spheroidized powder. |
| |
| Keywords: | Radio frequency plasma spheroidization Spherical powder WC-Co Spray granulation |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
