Rolling Film Forming Method for Advanced Ceramics

The so-called "rolling film forming" refers to mixing the prepared ceramic powder with a quantitative amount of organic binder and solvent, and then forming a film through rough rolling and finishing rolling before punching and forming. The main characteristics of rolling film forming are as follows:

(1) It is suitable for forming extremely thin slice Electroceramics components, such as transistor base, capacitor, membrane circuit substrate and other advanced ceramic products.

(2) The thickness of the parts is uniform and dense, with few pores and high production efficiency. It is suitable for batch production.

(3) The billet is only compacted in the thickness and length directions, and lacks sufficient pressure in the width direction, which leads to inconsistent shrinkage of the billet during firing, resulting in defects such as cracking and deformation of the workpiece.

(4) There are a lot of excess leftover materials in the punching process, which can be recycled, but it is inevitable to waste them.

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1. Process principle of rolling film forming

The rolling film forming process mainly refers to the forming principle of thin or strip materials in the rubber and plastic production process. It is developed by using the powder material itself or adding a certain amount of Plasticizer to make it have good plasticity.

2 The Process and Application of Rolling Film Forming

(1) The process of rolling film forming usually involves grinding and sieving the pre fired powder, accompanied by a certain amount of organic binder, plasticizer, and solvent. It is placed between two rollers for mixing, so that the powder, binder, or solvent components are fully and evenly mixed. Then it is heated and dried to gradually evaporate the solvent, forming a thick film. This process is called "rough rolling". After rough rolling, it is necessary to carry out finishing rolling. Finishing rolling involves gradually reducing the gap spacing between two rolling rolls and performing multiple folds. 90 ° turning and repeated rolling to achieve good uniformity, density, roughness, and thickness. The rolled billets should be stored in a certain temperature environment to prevent them from drying and embrittlement, in order to proceed with the next punching process. The specific process is as follows:

① Preparation of Rolling Film Blank

For ceramic materials, mixing barren powder with plasticizing agents to prepare billets with good plasticity is a key step in achieving roll film forming.

② Mixing and Rolling Film

The technological process of mixing and film rolling is mainly carried out on the film rolling machine. Mixing is also called "rough rolling". The main purpose of this technological process is to improve the uniformity of mixing of powder and Plasticizer and roll or preliminary strip.

(2) The influencing factors of rolling film forming

① The influence of pre firing powder raw materials

The raw materials used for rolling film forming are composed of barren ceramic powder raw materials and plasticizing agents. In order to achieve sufficient mixing between the two and be able to be rolled into very thin billets, ultimately obtaining high-performance parts, the powder raw materials must be pre calcined, which is mainly determined by the chemical composition characteristics of the material and the characteristics of the rolling film forming process itself.

② The influence of Plasticizer The Plasticizer used for film rolling is composed of binder, plasticizer and solvent

Yes. The volatilization characteristics of various adhesives and plasticizers during degumming heating are also different, with some having a wide range of volatilization temperature and others having a narrow range of volatilization. The Plasticizer with concentrated volatilization and large amount is easy to cause the green body cracking. For film rolling forming, in order to ensure the quality of film rolling, it is better to use polyvinyl alcohol aqueous solution and add appropriate glycerin as Plasticizer

Universal.

(3) Application of Rolling Film Forming Method

The rolling film forming method has unique advantages in the production of various chip functional ceramic components such as integrated circuit substrates, capacitors and resistors. This molding method has been widely used due to its high production efficiency, simple process, low cost, and low labor intensity.

3. Main defects of rolling film forming method

The main defects and causes of the green body prepared by the rolling film forming method are listed in Table 1.

Table 1 Main Defects and Causes of Rolling Film Forming Blank

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