The Influence of B₂O₃ on the Microstructures and Properties of CaO-B₂O₃-SiO₂-Al₂O₃ Glass-Ceramics (α-Al₂O₃) System

Abstract:

The glass composition CaO-Al₂O₃-B₂O₃-SiO₂ as an alternative glass composition, and commercial α-Al₂O₃ as a ceramic material was used. The structure of the glass was analyzed by infrared spectra; the glass-ceramics thermal expansion coefficient was measured by dilatometer, the phase separation of the sample was investigated by scanning electron microscope and the component of phase was analyzed by X-ray. The results show that [BO₃] increases and [BO₄] decreases in the glass structure with the increasing of B₂O₃ content added into CaO-Al₂O₃-B₂O₃-SiO₂ glass. The relative density and dielectric constant (εr) are considerably decreased with the addition of amount of B₂O₃. Excellent microwave dielectric properties of 1MHz, εr = 8.0 and tanδ=0.003 are obtained by adding 10 wt% B₂O₃ to glass-ceramic and sintering at 875°Cfor 30 min.

• Periodical: Advanced Materials Research (Volumes 189-193)
• Pages: 4466-4471
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.189-193.4466
• Online since: February 2011
• Authors: Hui Shao, Hong Qing Zhou, Xiao Dong Shen
• Keywords: CaO-B₂O₃-SiO₂-Al₂O₃, Infrared Spectrum, LTCC, Microwave Property

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