About this Abstract |
Meeting |
2021 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2021)
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Symposium
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Materials
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Presentation Title |
Direct 3D Printing of Transparent Spinel Ceramics via One-step Laser Direct Deposition |
Author(s) |
John Pappas, Edward Kinzel, Xiangyang Dong |
On-Site Speaker (Planned) |
Xiangyang Dong |
Abstract Scope |
This study investigated the additively manufactured transparent spinel ceramics by one-step laser direct deposition. Dense transparent magnesium aluminate spinel samples were directly fabricated from micron-size powders with greatly lowered manufacturing costs and simplified processing procedures. A highest optical transmittance of 82% was achieved at a wavelength of 632.8 nm, nearly comparable to that of sintered counterparts. Porosity and cracking were found to be main factors limiting the obtained transparency. The effects of laser processing conditions and powder compositions were systematically investigated. The morphology, optical transmittance, microstructure, and phase composition of the printed spinel samples were characterized. A single spinel phase was obtained from the proposed deposition method. Powder flow rate and laser power most significantly affected residual porosity. While cracking remained the most challenging issue for laser additively manufactured ceramics, doping showed promising results in effectively controlling crack formation during deposition attributed to grain refinement and introduced toughening mechanisms. |
Proceedings Inclusion? |
Definite: Post-meeting proceedings |