| 초록 |
Binder is probably the most important additive in manufacturing the ceramic tape. Insufficiency of binder leads to the occurrence of delamination in the lamination process of multi-layer ceramic process and an excessive binder leaves the residual pores after binder-burnout. To the extreme degree, we need a binder-free ceramic tape with sufficient strength, flexibility, and laminatability in the green state and without residual pores after burnout. To remove binders from the vicinity of ceramic powders in a green tape and to make the residual pore minimum after burnout, ceramic tapes with double layers were manufactured. One layer was comprised of only organic binder, which imparted sufficient strength and strong adhesive property to the green tape. The uniform binder layer at the bottom of the ceramic tape could make lamination easier and prevent the occurrence of delamination perfectly. The other one was a ceramic layer with a very small amount of binder. The binder content of the slurry for ceramic layer was under 2 weight % , which could lower the viscosity, make the slurry well-dispersed and considerably increase solid loading in the slurry. This higher solid loading led to higher green tape density, higher fired density of the product. The two-layer ceramic tape showed much better qualities than a common(or conventional) green tape especially in microstructure, laminatablilty, and tape density. In the multilayer structure made of the two-layer ceramic tape, the binder layer completely disappeared after binder-burnout and no defects from the two-layer structure were observed. |
