关键词: 珍珠岩;α-堇青石;微晶玻璃;介电性能;低温共烧陶瓷

Abstract: Single α-cordierite glass-ceramics were prepared successfully from perlite as the basic raw material.The effects of sintering temperature and SiO2 contents on the crystallization behavior,crystal phase composition,microstructure and property of the glass-ceramics were characterized by differential scanning calorimetry (DSC),X-ray diffractometer (XRD) and field emission scanning electron microscope (FESEM).The results show that μ-cordierite phase gradually decreases and finally transformed into α-cordierite, and the porosity reduces in the glass-ceramics with sintering temperature increasing.As SiO2 contents increases, the precipitation temperature of α-cordierite firstly reduces and then increases, and the density and the flexural strength of the glass-ceramics increase first and then decrease, and its dielectric properties are deteriorated.The single α-cordierite glass-ceramics were achieved from the glass with composition of Mg∶Al∶Si=2∶2∶5.95 sintered at 900 ℃ for 6 h.The as-synthesized glass-ceramics possessed high flexural strength (116 MPa), low dielectric constants (5.72, 10 MHz), low dielectric losses (0.0059, 10 MHz), and matchable coefficient of thermal expansion (2.91×10-6 K-1,very close to Si), which can be used as a potential low temperature co-fired ceramics (LTCC) substrate materials.

Key words: perlite;α-cordierite;glass-ceramics;dielectric property;LTCC