The advantages and forming methods of alumina ceramic materials are introduced in detail

The advantages and forming methods of alumina ceramic materials are introduced in detail

With the continuous development and progress of science and technology, the performance of very superior alumina ceramic materials has been widely used in various fields, the following by the United States ceramic manufacturers to focus on the advantages of alumina ceramic materials and molding methods.

The advantages of alumina ceramic materials:

1. alumina ceramic material has excellent insulation, high frequency loss is relatively small but high frequency insulation;

2. alumina ceramic material has the characteristics of heat resistance, small coefficient of thermal expansion, high mechanical strength and good thermal conductivity.

3. alumina ceramic has the characteristics of chemical corrosion resistance and molten gold properties.

4. alumina ceramic is not flammable, rust, strong and not easy to damage is with other organic materials and metal materials incomparable excellent properties.

5. alumina ceramic wear resistance, but the hardness is the same as corundum, to achieve Moh hardness nine wear resistance and superhard alloy is comparable.

The following focuses on the molding method of alumina ceramic materials:

1. Dry press molding: alumina ceramic thousand press molding technology is limited to simple shape and inner wall thickness of more than 1mm, the ratio of length to diameter is not more than 4:1 objects. The forming methods are uniaxial or bidirectional. Press has hydraulic type, mechanical type two, can be semi-automatic or automatic molding. The maximum press pressure is 200Mpa. The output can reach 15-50 pieces per minute. Because the stroke pressure of the hydraulic press is uniform, the height of the pressed parts is different when the powder filling is different. However, the pressure applied by mechanical press varies with the amount of powder filling, which can easily lead to the difference of size shrinkage after sintering and affect the quality of products.

2. Grouting molding method: grouting molding is the earliest molding method used for alumina ceramics. Due to the use of gypsum mold, low cost and easy to form large size, complex shape parts. The key of grouting molding is the preparation of alumina slurry. Water is usually used as flux medium, then add degumming agent and binder, exhaust after full grinding, and then pour into the plaster mold. The slurry solidifies in the mold due to the adsorption of water by the capillary of gypsum mold. In hollow grouting, when the adsorbed slurry on the mold wall reaches the required thickness, the excess slurry should be poured out. In order to reduce shrinkage of billet, high concentration slurry should be used as far as possible. Organic additives should also be added to the alumina ceramic slurry to form a double electric layer on the surface of the slurry particles to make the slurry stable suspension without precipitation. In addition, it is also necessary to add vinyl alcohol, methyl cellulose, alginate amine and other binder and polyacrylamine, Arabic gum and other dispersants, the purpose is to make the slurry suitable for grouting molding operation.

The above is the content of Meicheng ceramics for you. Meicheng Ceramics is an electronic ceramic enterprise integrating research and development, production and sales. It is a listed enterprise, located in the electronic ceramic Industrial Park of Xinhua County, Hunan Province, covering an area of 8W. Mainly engaged in: zirconia ceramics, alumina ceramics, talc porcelain and other non-oxide ceramics research and development and application.