Preparation, characterization and properties of alumina-lithium aluminium borosilicate glass based LTCC tapes

A new low temperature cofired ceramic (LTCC) tape based on 40 wt% Al2O3-60 wt% LABS glass (40Li(2)CO(3):10Al(2)O(3):30B(2)O(3):20SiO(2)) has been developed. The dielectric properties of the LABS glass are studied. The structural, dielectric, thermal as well as the chemical compatibility with Ag electrode of the bulk Al2O3-LABS sintered at 800 A degrees C are investigated .The room temperature thermal conductivity and CTE of the bulk are 3.80 Wm(-1) K-1 and 5.1 ppm/A degrees C respectively. The Al2O3-LABS slurry which has a pseudoplastic nature is made into thin sheets using tape casting technique. The green tape has a surface roughness of 293 nm and tensile strength 0.2 MPa. The Al2O3-LABS based LTCC tapes are sintered at 775 A degrees C has epsilon(r) of 4.70 with tan delta 0.005 and tau(epsilon) of +412 ppm/A degrees C at 5 GHz. The results suggest that the Al2O3-LABS based LTCC tapes is a possible candidate for LTCC device applications.