Binder for Ceramic Slip for Multilayer Ceramic Capacitor Manufacturing
The type of binder used in making ceramic slips is very important for controlling sheet-strength and flexibility. Typical contaminants found in ceramic slips include not only large particles and agglomerations, many from the raw materials themselves, but also gels formed after mixing with BT binders.
Typically, either PVB (polyvinyl butyral), butyl methacrylate or methyl methacrylate is used as the BT binder. This binder is dissolved into the same solvent as found in the ceramic slip. In many cases, not all of the binder is fully dissolved and remains in the solvent as gels which are then mixed into the BT slurry. The presence of gels can cause problems since they can create voids during the sintering process. As a result, the inner electrode can collapse into the dielectric layer leading to a short circuit.
Pall Corporation has successfully implemented proprietary filtration technologies for gel retention of BT binder.
Filtration Products for Binder for Ceramic SlipPall's Profile® Star filters and Poly-Fine® XLD filters, unique hybrids of pleated and depth filter construction, have become increasingly important for thin layer and high viscosity applications, where the high differential pressures cannot be addressed by traditional depth filters.
For submicron filtration of the most advanced, thinnest layer green sheet being developed, Pall Corporation’s Ultipor® GF-HV glass microfiber filter is available in removal ratings as fine as 0.1 micron.