No abstract

90 - nm -thick a-Ge films were melted and solidified by excimer laser annealing method. The superlateral growth (SLG) distance increased from 0.5to4.1μm with increasing absorption coefficient of the light-absorptive underlayer. Real-time reflectivity measurement revealed that the increase in the SLG distance resulted from an increase in the Ge film solidification term from 60to650ns. The SLG velocity calculated from the proportionality constant of the SLG distance and the solidification term was 6–7m∕s. It was shown that SLG grains exhibit a single-crystalline structure.

No abstract

No abstract

The primary concern of the Industry 4.0 is the direct digital manufacturing of customized products on demand at high production speed, high accuracy with functional material property. Although the unique capabilities of existing additive manufacturing technologies make it suitable for direct digital manufacturing, there are numerous limitations which include low printing speed, less accuracy and repeatability, and a limited selection of materials for a particular application. Therefore, a high-speed additive manufacturing approach is proposed in this paper, that is capable of achieving high speed of production, high accuracy, and surface finish, and functional material property. For better understanding, authors describe those additive manufacturing technologies that are capable of achieving the aforementioned characteristics. For validation, samples of various dimensions were 3D printed on a selective laser sintering and a high-speed multijet fusion 3D printer. The results were compared in the context of printing speed, surface roughness (Ra), and hardness of printed parts. Results revealed that the multijet fusion process is significantly faster than its counterpart while sacrificing Ra to some extent but the hardness of printed parts is not changed significantly. The selective laser sintering-printed samples had a 15% lower Ra compared with multijet fusion samples. The results also revealed that the multijet fusion process might be able to print composite/multi-materials; however, more research needs to be done.