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May 20, 2024

Tape-casting: Method for producing electronic ceramic sheets

High-performance ceramic materials have the characteristics of high strength, high hardness, wear resistance, and corrosion resistance, and are widely used in energy, information, aerospace, electronics, biology and medicine, and other fields. The ceramic molding method is an important factor in determining ceramic performance, and tape casting is currently one of the commonly used methods for producing electronic ceramic sheets.

Tape-casting

Tape casting refers to a molding method in which solvents, dispersants, binders, plasticizers, and other ingredients are added to ceramic powder to obtain a uniformly dispersed and stable slurry, and a film of the required thickness is produced on a tape casting machine.

Compared with other molding processes, tape casting has many advantages: the equipment and process are simple and can be produced continuously; single-phase or multi-phase ceramic sheet materials can be prepared; the product has small defects, uniform performance, high production efficiency, and can be operated continuously; uniform It can be produced in large and small batches and is suitable for industrial production. The biggest feature of tape casting is that it is very suitable for the preparation of large thin plate ceramic parts, which is difficult to achieve by pressing or extrusion molding processes. However, there are also some problems with tape casting. The main reason is that the binder content is high, so the shrinkage rate of the blank is large during the discharging glue process, and the thin sheets are prone to defects such as cracking, curling, and uneven thickness.

Tape-casting process

Tape casting was first used in the fields of papermaking, paint, and plastics. It is a long-standing molding technology that mainly includes processes such as slurry preparation, ball mill mixing, molding, drying, degreasing, and sintering.

Process flow chart for preparing ceramic substrates by tape casting

First, the ceramic powder and dispersant are added to the solvent (water or organic solvent), and the particles are agglomerated through ball milling or ultrasonic oscillation, and the solvent is allowed to wet the powder, and then the binder and plasticizer are added, and the particles are obtained by secondary ball milling. Stable and uniform slurry; then the slurry is formed on a casting machine to obtain a green body; then dried to evaporate the solvent, and the binder forms a network structure between the ceramic powders to obtain a green body film; and then the green body is formed The raw film is machined to obtain the specific shape required; finally, the required finished product is obtained through degreasing and sintering.

Application

Due to its simple equipment, continuous operation, high production efficiency, and uniform body performance, the tape casting method has become an important method for preparing large-area, ultra-thin ceramic substrates and is widely used in the electronics industry, energy industry, and other fields.

Also used in monolithic capacitor tiles, Al2O3 substrates for thick film and thin film circuits, piezoelectric ceramic diaphragms, structural ceramic sheets, capacitors, thermistors, ferrite and piezoelectric ceramic bodies, and hybrid integrated circuit substrates. It is also used in the field of mobile phone ceramic covers.

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