流延知识（Tape casting knowledge）.doc

流延知识（Tape casting knowledge） Tape Basics What is tape casting? Casting method is adding adhesive and solvent in powder, by ball milling, after filtering, vacuum deaeration and viscosity control in a certain range. The viscous slurry under the constant pressure, the gap at a certain speed running through slurry scraper and coated with silicone membrane strip between the flow viscosity on the film tape, by continuous drying, cutting edge, the strand separation and membrane with casting machine tail (or separation), method the green belt winding respectively. Then, the process of tape casting is formed by entering the next process, such as cutting, laminating, printing, sintering, etc., to produce the desired product. In the casting process, the most important is the preparation of slurry and casting molding process. Two, tape applications Engineering flow chart for preparing ceramic sheet by tape casting By ball milling and a series of processes in the slurry to remove organic or inorganic residue to obtain uniform slurry, the slurry was prepared by casting in casting machine molding, drying, cutting, degreasing and sintering can be completed. Three, the commonly used additives in the slurry 1. solvent The main factors of the solvent selection considered are: (1) must be able to dissolve other additives, such as dispersant, binder and plasticizer; (2) has a certain chemical stability in slurry, and the powder chemical reaction; (3) volatile and burning; (4) the use of safety health, and less pollution to the environment. The most commonly used solvents are divided into two categories: organic solvents and water. The slurry obtained from organic solvent has low viscosity, fast solvent evaporation and short drying time. Therefore, more organic solvents are used in the casting process. Commonly used are ethanol, methyl ethyl ketone, trichloroethylene, toluene, xylene and so on. But organic solvents have both flammable and toxic disadvantages. Water is the solvent has low