Laser powder bed fusion of diamond/N6 MMCs enabled by Ni-Ti coated diamond particles

Materials & Design

Lu Wang¹  Minglu Ding²  Wentao Yan³  Wenjun Ge⁴  Sheng Zhang⁴ 

[1] Corresponding authors at: School of Mechanical Engineering, University of Science and Technology Beijing, PR China (S. Zhang).;School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, PR China;Department of Mechanical Engineering, National University of Singapore, Singapore 117575, Singapore;School of Mechanical Engineering, University of Science and Technology Beijing, PR China;

关键词: Metal matrix composites;    Diamond;    Coating;    Ni-based composites;    Ball milling;    Laser powder bed fusion;   

DOI  :  

来源: DOAJ

【 摘 要 】

Metal matrix composites (MMCs) have received increasing attention and there is a growing interest in additive manufacturing (AM) of MMCs with complex shapes recently. However, it remains challenging to control the quality of composite powder for MMCs. In this study, the diamond particles are firstly coated with thin layers of Titanium and Nickel to ensure strong interface bonding with the Nickel matrix. The influence of ball milling parameters on the Ni-Ti coated diamond/N6 composite powder particles preparation and the effect of processing parameters during laser powder bed fusion (LPBF) on the densification of and defects in the fabricated samples are analyzed. In the ball milling stage, the results show that highly flowable composite powder particles for LPBF can be obtained under a ball milling time of 4 h, a speed of 250 rpm, and a ball-to-powder ratio of 2:1. With the optimized composite powder, a set of Ni-Ti coated diamond/N6 MMCs are further manufactured under the laser powers of 150, 160, and 170 W and scanning speed of 250 mm/s, the MMC samples have relative densities higher than 99%. Our study demonstrates the feasibility of manufacturing dense diamond/N6 and other similar MMCs with appropriate coating, ball-milling and LPBF parameters.

【 授权许可】

Unknown