New Technology for Preparing LTCC Green Tapes with Aqueous Tape Casting

A new technology of aqueous tape casting process has been developed to produce borosilicate glass-ceramic based low temperature co-fired ceramics (LTCC) green tapes for its low cost,safety and no toxicity advantage with water-based latex as binder. Effect of volume fraction of solid phase powders,dispersant and binder on the viscosity of LTCC slurry was investigated by viscometer and surface images of the prepared LTCC tapes before and after sintering were observed by SEM. The results show that with borosilicate glass and alumina powders as solid phase,styrene-acrylate latex as binder,cinnamate ammonium as dispersant and glycerol as plasticizer,water-based LTCC slurry was prepared with high solid fraction,good stability and rapid drying. The green tapes produced by this process had smooth surface and high intensity,and could be laminated at room temperature. After sintered at 850 ℃ for 30 min,the relative bulk density of the tape was as high as 96.45%.