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Properties of Nano-composite Powders of NiCrCoAlY-TiB2 Prepared by High Energy Ball Milling for High Velocity Air Fuel Spraying |
Jizhong WANG1,2,Xiaozhou CHE1,Yaosha WU2,Gang WANG1,2,Hongya YU1,2,Dechang ZENG1( ) |
1. School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China 2. Gent Materials Surface Technology (Guangdong) Co., Ltd, Zhongshan 528437, China |
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Cite this article:
Jizhong WANG,Xiaozhou CHE,Yaosha WU,Gang WANG,Hongya YU,Dechang ZENG. Properties of Nano-composite Powders of NiCrCoAlY-TiB2 Prepared by High Energy Ball Milling for High Velocity Air Fuel Spraying. Chinese Journal of Materials Research, 2017, 31(6): 465-471.
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Abstract Flowability is a prerequisite for the applicability of powders for thermal spraying. Nanoscale feedstock of NiCrCoAlY-TiB2MMCs (metal matrix composites) was synthesized by high energy ball milling method with NiCrCoAlY and TiB2 powders as raw material, and argon as shielding gas. The milled powder was characterized by scanning electron microscope, X-ray diffraction, apparent density tester, tap-density tester, repose angle tester and laser scattering. The results show that after wet-milled at 320 r/min for 20 h and dry-milled at 220 r/min for 5 h, a stable nanoscale feedstock of NiCrCoAlY-TiB2 MMCs was obtained. The particle size ranges from 5 to 50 μm and a majority of the powders shows ellipsoidal morphology which is expected to have good fluidity during HVOF spraying. Compared with the initial mixed powders, the repose angle of milled powders reduces from 38.4° to 32.9°, HR value reduces from 1.925 to 1.248, indicating the flowability has been improved obviously.
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Received: 29 August 2016
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