Bubble formation in additive manufacturing of glass
| Autor: | Robert G. Landers, Daniel Peters, Augustine Urbas, Junjie Luo, Luke J. Gilbert, Jonathan T. Goldstein, Douglas A. Bristow, Edward C. Kinzel |
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| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Materials science 02 engineering and technology Substrate (electronics) 021001 nanoscience & nanotechnology Laser 01 natural sciences law.invention Condensed Matter::Soft Condensed Matter Physics::Fluid Dynamics Protein filament law 0103 physical sciences Laser power scaling Liquid bubble Composite material 0210 nano-technology Anisotropy Spectroscopy Layer (electronics) |
| Zdroj: | SPIE Proceedings. |
| ISSN: | 0277-786X |
| DOI: | 10.1117/12.2224321 |
| Popis: | Bubble formation is a common problem in glass manufacturing. The spatial density of bubbles in a piece of glass is a key limiting factor to the optical quality of the glass. Bubble formation is also a common problem in additive manufacturing, leading to anisotropic material properties. In glass Additive Manufacturing (AM) two separate types of bubbles have been observed: a foam layer caused by the reboil of the glass melt and a periodic pattern of bubbles which appears to be unique to glass additive manufacturing. This paper presents a series of studies to relate the periodicity of bubble formation to part scan speed, laser power, and filament feed rate. These experiments suggest that bubbles are formed by the reboil phenomena why periodic bubbles result from air being trapped between the glass filament and the substrate. Reboil can be detected using spectroscopy and avoided by minimizing the laser power while periodic bubbles can be avoided by a two-step laser melting process to first establish good contact between the filament and substrate before reflowing the track with higher laser power. |
| Databáze: | OpenAIRE |
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