Al2O3含量对PbO-CaO-B2O3-SiO2系玻璃析晶行为与烧结性能的影响

PbO-CaO-B₂O₃-SiO₂系玻璃粉体是耐高过载低温共烧陶瓷(LTCC)生瓷带的主要组成部分。玻璃粉体的析晶行为影响烧结性能,进而决定基板的使用性能。本文研究了Al₂O₃含量对PbO-CaO-B₂O₃-SiO₂系玻璃析晶行为与烧结性能的影响。结果表明:向PbO-CaO-B₂O₃-SiO₂系玻璃中引入Al₂O₃可抑制玻璃析晶,防止高膨胀晶相的析出,并提高玻璃烧结密度;不含Al₂O₃的PbO-CaO-B₂O₃-SiO₂玻璃粉体析晶峰温度为862 ℃,烧结过程中析出方石英晶相,20~200 ℃的平均线膨胀系数高达260.8×10^-7 ℃^-1;引入2.1%(质量分数)Al₂O₃可显著抑制玻璃析晶,700 ℃烧结后膨胀系数降低至72.9×10^-7 ℃^-1,介电常数显著增大,由6.30提高至7.02。

Effect of Al2O3 Content on Crystallization Behavior and Sintering Performance of PbO-CaO-B2O3-SiO2 Glass

PbO-CaO-B₂O₃-SiO₂ glass powder is the main component of low temperature co-fired ceramics (LTCC) raw green tape with high overload resistance. The crystallization behavior of glass powder affects the sintering performance, and then determines the performance of substrate. The effect of Al₂O₃ content on crystallization behavior and sintering performance of PbO-CaO-B₂O₃-SiO₂ glass was studied. The results show that the addition of Al₂O₃ into PbO-CaO-B₂O₃-SiO₂ glass can reduce the trend of crystallization, prevent the precipitation of high expansion crystalline phase and improve the sintering density of glass. The crystallization peak temperature of PbO-CaO-B₂O₃-SiO₂ glass powder without Al₂O₃ is 862 ℃, and cristobalite phase precipitates during sintering, which makes the average coefficient of linear expansion reach 260.8×10^-7 ℃^-1 at 20~200 ℃. The addition of 2.1% (mass fraction) Al₂O₃ into PbO-CaO-B₂O₃-SiO₂ glass can significantly reduce the crystallization capability of glass, and the expansion coefficient decreases to 72.9×10^-7 ℃^-1 after sintering at 700 ℃, with significantly increased dielectric constant from 6.30 to 7.02.