About the production method of alumina ceramics products

Aluminum oxide ceramic is a white solid at room temperature, odorless, almost insoluble in water, and does not conduct electricity. Alumina has a wide range of uses in industry. For example, high-temperature sintered alumina ceramics is called artificial corundum or artificial gemstones. It can be used to make mechanical bearings or diamonds in watches. It is also used in high-temperature refractory materials, such as making refractory bricks and dry pots. wait. Aluminum oxide ceramics has many isomorphic crystals, more than 10 of which are known. There are three main crystal forms, namely α-Al2O3, β-Al2O3, and γ-Al2O3. Different structures have different properties. At high temperatures above 1300°C It is almost completely converted into α-Al2O3.

Methods of producing alumina ceramics

1. Industrial alumina ceramics method: Using aluminate as raw material, alumina is obtained through acid and alkali treatment, hydrolysis, precipitation, filtration, drying and other process steps.

2. Sol-gel method: After mixing aluminum salt and hydroxide or carbonate, they form a colloidal solution through physical or chemical methods, and then go through steps such as gelling, drying, and sintering to obtain alumina ceramics.

3. Alumina ceramics electrolysis method: Dissolve alumina in high-temperature molten salt, and reduce the alumina into metallic aluminum ceramics and oxygen through electrolysis, while also producing a certain amount of alumina.

4. Vapor phase deposition method: The aluminum raw material is heated in a high-temperature and high-pressure atmosphere to evaporate and react with oxygen to generate aluminum oxide particles, which are then deposited on the substrate to obtain alumina ceramics.

The above are the main methods for producing alumina ceramics . Each method has its own characteristics and scope of application. You can choose the appropriate method for production according to different needs.

Alumina ceramics uses in industrial materials

Alumina ceramics have many excellent properties, such as: high mechanical strength, high insulation resistance, high hardness, wear resistance, corrosion resistance, and high temperature resistance; alumina can also be used as electronic ceramics, such as vacuum devices, circuit substrates, and spark plug insulating ceramics wait. In addition, high-strength and high-hardness alumina can be used as structural ceramics, such as abrasives, knives, scrapers, textile ceramics, etc. for the paper industry. It has good chemical stability and can be used as chemical and biological materials. Ceramics, such as artificial joints and crucibles; alumina can be used in fine ceramics, such as mechanical bearings.

1. alumina ceramics Refractory materials

When alumina ceramic is used in refractory materials, it is mainly used to produce refractory boards, refractory alumina ceramic bricks, heat insulation and other refractory materials. Refractory materials are stacked in the shell of the smelting furnace to insulate the smelting furnace. At the same time, it also protects the outer shell of the smelting furnace from being melted by the high temperature in the smelting furnace. Refractory bricks are mainly used in the metallurgical industry, such as in the construction of steel kilns.

2. alumina Ceramics Abrasives

Alumina ceramics can be used as abrasives, and abrasives can be divided into ordinary abrasives and special abrasives. When used as a general abrasive, aluminum is suitable for abrasives and cutting tools due to its high hardness; as a special abrasive, it plays the role of polishing and grinding stainless steel.

3.Glaze

The role of oxides in glazes: Al2O3 ceramics mainly includes clay feldspar, which introduces available industrial alumina ceramics and is an intermediate for forming glass. Al2O3 ceramics can improve the properties of glazes and improve chemical properties.

4. Gem material

Sapphire, also known as corundum, is a single crystal of aluminum oxide ceramics and is widely used in infrared military devices, satellite space technology, high-intensity laser window materials, etc. It can also be used in the semiconductor lighting industry, civil aerospace, military industry, etc., such as wave-transmitting windows, fairings, photoelectric windows, shields, gyros, wear-resistant bearings and other components.

5. Laser materials

Laser processing of alumina industrial ceramics is a non-contact processing using laser as processing energy, which avoids surface cracks caused by removing brittleness of alumina materials. When high-energy laser acts on the processing surface of the workpiece, the absorption efficiency of the long-wave laser is very high because it is an alumina industrial ceramic material. Yangzhou Zhongtianli New Materials has focused on the research of industrial raw materials such as high-purity metallic arsenic, aluminum isopropoxide, pseudo-boehmite, activated alumina, high-purity alumina and micro-nano powder for many years, and has provided products for LED, sapphire, Lithium battery ceramic separator manufacturers and pharmaceutical and chemical manufacturers provide raw materials

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