Introduction of Forming Process of Aluminum Nitride Ceramic Substrate

The powder preparation technology of industrial ceramic aluminum nitride is introduced above. I wonder if you know something about it? Ceramic molding is also a crucial step in the process of making ceramic substrates. The following is the introduction of Kezhong Ceramics Factory.

Although traditional molding processes such as dry pressing and isostatic pressing are suitable for the preparation of high-performance AlN bulk materials, they are difficult to use in large-scale production because of their high cost and low efficiency. In order to break through the limitations of the traditional molding methods of AlN ceramics, new molding processes such as tape casting, casting, and injection molding have emerged as the times require. The latter two are mainly suitable for ceramic parts with complex shapes.

Currently, tape casting is the main molding method for AlN ceramic substrates.

1 tape casting process

Tape casting method, also known as knife forming method, has become the main molding process of AlN ceramic substrate with high thermal conductivity. The addition of various additives such as solvent, dispersant, binder and plasticizer in AlN paste is to improve its fluidity, One of the important factors for improving the mechanical properties and thus preparing high-performance AlN ceramic substrates.

There are two kinds of tape casting systems, namely organic casting system and water machine casting system. Compared with the latter, the research on the organic casting system is more widely used earlier, and has the characteristics of a wide range of solvent choices, short drying time, and prevention of powder hydration. However, the commonly used organic solvents such as alcohols, ketones, and benzene have certain Toxicity, damage to the environment, and high cost. In recent years, the water-based tape casting process has received widespread attention, but the problems of low quality, dryness and easy cracking have restricted its development process. However, regardless of the system, the rheological properties of the slurry are undoubtedly one of the most critical factors in the forming process of AlN ceramics.

From the perspective of operating cost and sustainable development, the water-based casting system is better, but the easy hydrolysis of AlN powder seriously hinders the development of AlN ceramic water-based casting process, so people will use the surface modification process to improve Hydrolysis resistance and stability of AlN powders.

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