Aluminum oxide powder (chemical formula Al ₂ O3) is a multifunctional inorganic material widely used in industrial, electronic, chemical and other fields due to its high melting point, high hardness, chemical stability and insulation properties. The following is a classification and analysis of its core functions and uses:

1、 Refractory and high-temperature materials

Refractory Products

High temperature furnace lining: used as an inner lining material for steel and glass kilns, capable of withstanding high temperatures above 1600 ℃ and resisting slag erosion.

Castable/Spray Coating: As an aggregate for amorphous refractory materials, it enhances high-temperature flexural strength (>10MPa) and wear resistance, extending equipment life.

Ceramic reinforcement

Structural ceramics: added to ceramic bodies to increase hardness (Mohs hardness 9.0) and bending strength (>800 MPa), used for cutting tools, bearings, etc.

Special ceramics, such as spark plugs and wear-resistant pump valve components, are corrosion-resistant and have excellent thermal stability.

2、 Grinding and polishing field

Abrasive application

Fixed grinding tools: Made into grinding wheels and cutting blades, efficiently grinding metals and glass, with better cost-effectiveness than diamond.

Sandblasting treatment: used for rust removal and deburring of metal surfaces, especially suitable for scenarios sensitive to iron contamination (such as aerospace components).

Precision polishing

Optical components: Polishing lenses and crystals with ultra-fine powder (such as 0.2-3 μ m) to achieve nanoscale surface roughness.

Semiconductor wafer: High purity alumina slurry is used for CMP polishing of silicon wafers to reduce scratches.

3、 Electronic and Optical Materials

Electronic substrate and packaging

Integrated circuit substrate: 99.99% high-purity α - Al ₂ O3 substrate, thermal conductivity ≥ 28 W/(m · K), good insulation.

Vacuum tube/capacitor: resistant to high voltage, low dielectric loss, ensuring stability of high-frequency devices.

functional coating

Lithium battery separator coating: Nano alumina enhances the thermal stability of the separator (resistant to temperatures above 200 ℃), preventing thermal runaway.

Energy saving lighting: As a fluorescent layer material for high-pressure sodium lamps, it enhances the efficiency of far-infrared radiation.

4、 Chemical Catalysis and Environmental Protection

Catalyst carrier

Petroleum refining: γ - type activated alumina supported catalyst, used for cracking and desulfurization reactions, with a specific surface area of several hundred m ²/g.

Automobile exhaust treatment: Honeycomb shaped carrier adsorbs harmful gases and is resistant to high temperature corrosion.

Adsorption and Purification

Fluoride removal agent: Activated alumina balls can adsorb fluoride ions in drinking water with a capacity of 2-4 mg/g.

Gas drying: Deeply dehydrated to a dew point of -70 ℃, used for gas purification in the oxygen and electronics industries.

5、 Other innovative applications

Biomaterials: Nano alumina enhances the wear resistance of artificial joints and has excellent biocompatibility.

Composite material modification: added to plastics and rubber to enhance creep resistance and wear resistance.

UV cured coating: improves the scratch resistance of floor paint and plastic surfaces, and extends their service life.