NDLI: Direct 3D Printing of Silica Doped Transparent Magnesium Aluminate Spinel Ceramics

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Direct 3D Printing of Silica Doped Transparent Magnesium Aluminate Spinel Ceramics

Content Provider	MDPI
Author	Pappas, John Dong, Xiangyang
Copyright Year	2020
Description	Transparent magnesium aluminate spinel ceramics were additively manufactured via a laser direct deposition method in this study. With a minimum porosity of 0.3% achieved, highly transparent spinel samples with the highest total optical transmittance of 82% at a wavelength of 632.8 nm, were obtained by a 3D printing approach. However, cracking was found to be a major issue affecting printed spinel samples. To control prevalent cracking, the effect of silica dopants was investigated. Increased silica dopants reduced average total crack length by up to 79% and average crack density by up to 71%. However, a high dopant level limited optical transmission, attributed to increased porosity and formation of secondary phase. Further investigation found that with decreased average fracture toughness, from 2.4 $MPa\cdotm1/2$ to 1.9 $MPa\cdotm1/2$ , the obvious reduction in crack formation after doping was related to decreased grain size and introduction of softer secondary phase during deposition. The study demonstrated the feasibility of the proposed laser direct deposition method in directly fabricating transparent spinel ceramics while dopants showed potentials in addressing cracking issues.
Starting Page	4810
e-ISSN	19961944
DOI	10.3390/ma13214810
Journal	Materials
Issue Number	21
Volume Number	13
Language	English
Publisher	MDPI
Publisher Date	2020-10-28
Access Restriction	Open
Subject Keyword	Materials Manufacturing Engineering Transparent Ceramics Magnesium Aluminate Spinel Silica Doping Laser Direct Deposition Additive Manufacturing
Content Type	Text
Resource Type	Article

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