Journal
CERAMICS INTERNATIONAL
Volume 44, Issue 12, Pages 14896-14900Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2018.04.202
Keywords
Glass-ceramics; beta-spodumene; Crystallization; Microwave transmittance; Polarization loss
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Funding
- Taishan Scholar Project [ts201511080]
- National Natural Science Foundation of China [51672059, 51172050, 51102060, 51302050]
- Natural Scientific Research Innovation Foundation in Harbin Institute of Technology [HIT.NSRIF.2014129]
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Lithium aluminum silicate (LAS) glass-ceramic exhibits high transmittance to electromagnetic wave and is an ideal radome material. LAS glass-ceramics with different ratios of Li/Al were prepared by sol-gel method. Crystallization behaviors and wave-transparent properties of sintered powders were characterized. beta-spodumene was detected as the major phase that precipitated from the sample with 1:1 ratio between Li and Al, which exhibited ultra-low complex permittivity (epsilon, 2.78) and dielectric loss tangent values. The microwave transmittance in 2-18 GHz is higher than 90% when the thickness is within 1.7 mm, suggesting that this kind of LAS glass-ceramic possesses excellent wave-transparent properties.
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