Structure and Properties of Al2O3 Composited Li2O-Al2O3-B2O3 Glass-ceramics
Ultra-low temperature co-fired ceramic(ULTCC)technology represents a promising avenue in the realm of electronic substrate materials.Li2O-Al2O3-B2O3 glass-ceramics,characterized by their remarkably low sintering temperature,emerges as a novel and viable material for ULTCC applications.The Li2O-Al2O3-B2O3 parent glass was synthesized via a high-temperature melting and water quenching process.A comprehensive study was conducted to elucidate the impact of Al2O3 on structural and dielectric properties of the Li2O-Al2O3-B2O3-Al2O3 composite ceramics.For this study,differential scanning calorimetry(DSC),X-ray diffraction(XRD),hot stage microscopy(HSM)and scanning electron microscopy(SEM)were employed.It is revealed that an escalation in the Al2O3 content resulted in a marked reduction in the precipitation of the primary crystalline phases,Li3AlB2O6 and Li(AlB2O5),within the composite materials after post-sintering at 600 ℃.Concurrently,there was a progressive diminution in the Q×f value,accompanied by an upward trend in the dielectric constant.Notably,when the Al2O3 proportion reached 10 wt.％,the volumetric density of the composite material,post-sintering at 600 ℃,was quantified at 2.14 kg·m-3,with a dielectric constant of 4.7 at 7.4 GHz and a Q×f value of 19662 GHz.These attributes underscore the potential utility of this material within the ULTCC domain.
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