Additively manufacturing (AM) has been used to manufacture fine structures with structured/engineered porosity in heat management devices. In this study, laser powder bed fusion (LPBF) was used to manufacture a high-performance Ni-superalloy heat pipe, through tailoring LPBF process parameters to fabricate thin wall and micro-channel. By using novel laser scanning strategies, wick structure heat pipes with maximised surface-area-to-volume ratio, fine features size around 100 µm, and controlled porosity were successfully fabricated. Microscopy and X-ray microtomography (micro-CT) were used to investigate the 3D structure of the void space within the pipe. Wick test results showed most of the heat pipes made by LPBF have better performance than the conventionally manufactured pipes. This study also investigated the influence of the process parameters on the porosity volume fraction and the feature size. The results show LPBF process can fabricate thin structure due to the change of melt pool contact angle. The relationship between process parameters and bead size reported in this study could help design and manufacture heat pipe with complex fine structure.
|Journal||Advances in Manufacturing|
|Publication status||Accepted/In press - Apr 2022|
Bibliographical noteNot yet published as of 09/05/2022.
- Laser-based powder bed fusion
- heat pipe
- melt pool