Composite ceramic material and inner container of electric cooker prepared from composite ceramic material

Abstract

The invention discloses a composite ceramic material and an inner container of an electric cooker prepared from the composite ceramic material. The composite ceramic material is prepared from the following components in parts by weight: 3-8 parts of barium carbonate, 20-35 parts of calcite, 5-10 parts of kaolin, 35-55 parts of silica powder, 3-8 parts of potassium nitrate, 10-15 parts of paraffin, 3-8 parts of sodium carbonate, 7-8 parts of boric acid, 11-15 parts of quartz, 50-75 parts of aluminum nitride powder, 2-3 parts of yttrium oxide and 3-5 parts of lanthanum oxide, wherein the aluminum nitride powder is generated by reacting aluminum oxide powder serving as an aluminum source and carbon black powder in the flowing nitrogen atmosphere at the temperature of 1500-1700 DEG C; calcium oxide is added as a catalyst in the reaction process, and decarbonization is carried out in dry air with the temperature of 700-800 DEG C after the reaction is finished; the mass content of cation impurities in the aluminum oxide powder is lower than or equal to 0.02%, and the mass contents of silicon and iron impurities are respectively lower than 0.001%; and the average particle size of the carbon black powder is 35-40nm, and the specific surface area is smaller than or equal to 90m<2> / g.

Description

technical field [0001] The application relates to a composite ceramic material and an electric rice cooker liner prepared by the composite ceramic material, which belongs to the cross-technical field of household cooking appliances and ceramic materials. Background technique [0002] The liner is an important part of household appliances such as rice cookers, but the traditional liner has low thermal efficiency and short service life, which is not suitable for the development of modern electrical appliances. The rice cooker liners currently on the market are usually made of aluminum, iron, stainless steel and other materials, but the surface of the rice cooker liners made of these materials must be surface treated and sprayed. When used for a long time, The sprayed coating on the surface will fall off and fade, which is neither hygienic nor beautiful, and does not meet the requirements of people in today's society for environmental protection and health of products. [0003...

AI Technical Summary

Problems solved by technology

However, there are also some disadvantages in the ceramic inner tank, such as poor oxidation resistance, which seriously affects the service life and safety performance of the ceramic inner tank. In addition, the ceramic inner tank on the market has slow heating, low thermal conductivity, and linear expansion coefficient. Other parts of the inner tank of the rice cooker do not match, the heat transfer is uneven, and problems such as undercooked rice often occur