Lead-Borosilicate Glass계 LTCC용 유전체에 대한 고찰

초록

The effects of lead-borosilicate glass frits on the sintering behavior and microwave dielectric properties of ceramic-glass composites were investigated as functions of glass composition of glass addition (10~50 vol%), softening point (Ts) of the glass, and sintering temperature of the composites (500~900C for 2 h). The addition of 50 vol% glass ensured successful sintering below 900C. Sintering characteristics of the composites were well described in terms of Ts. PbO addition in to the glass enhanced the reaction with Al2O3 to form liquid phase and PbAl2Si2O8, which was responsible to lower Ts. Dielectric constant (εr), Q × f0 and temperature coefficient of resonant frequency (τf) of the composite with 50 vol% glass contents(B2O3:PbO:SiO2:CaO:Al2O3 =5:40:45:5:5) demonstrated 8.5, 6,000 GHz, .70 ppm/C, respectively, which is applicable to substrate requiring a low dielectric constant. When the same glass composition was applied sinter MgTiO3 and TiO2, at 900C (50 vol% glass in total), the properties were 23.8, 4,000 GHz, .65 ppm/C and 31.1, 2,500 GHz, +80 ppm/C respectively, which is applicable to filter requiring an intermidiate dielectric constant.

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