Alumina, with the chemical formula Al₂O₃, is a white powder or granular solid without any odor and extremely hard. It exists in nature in the form of corundum and can exhibit brilliant colors such as ruby (containing chromium) or sapphire (containing titanium and iron) due to trace impurities. In industry, it is not only a key raw material for electrolytic aluminum production but also an excellent ceramic material and functional material.

Product Introduction

Chinese name: Aluminum Oxide, High-Purity Ultra-Fine Aluminum Oxide, Corundum

English name: Aluminum Oxide, Alumina

CAS number: 1344-28-1

Molecular formula: Al₂O₃

Molecular weight: 101.96

Detailed parameters (physical and chemical indicators)

Alumina exists in multiple crystal forms (the most common ones being α and γ forms), and its technical specifications vary depending on the application. The following are the general parameter ranges summarized based on various industrial standards and product manuals:

Characteristics and Applications

1. High-performance ceramics and structural components

• Application of characteristics: Utilize its high hardness and high-temperature resistance properties.

• Specific applications: manufacturing high-hardness alumina ceramics, transparent ceramics (such as the tubes of high-pressure sodium lamps), artificial gemstones (ruby, sapphire), special refractory materials, crucibles, and cutting tools.

• Strengthening and toughening: As fillers for high-molecular materials such as plastics and rubber, they can significantly enhance the wear resistance, creep resistance and dimensional stability of the products.

2. Electronics Industry and Thermal Conductive Materials

• Application of characteristics: Utilize its insulating and thermal conductivity properties.

• Specific applications: Manufacturing integrated circuit substrates, electronic packaging materials, components for YAG laser crystals, and fillers for MLCC (multi-layer ceramic capacitors). Spherical alumina is commonly used to fill in thermal conductive silicone pastes and aluminum-based copper-clad boards (used in LED lighting) to enhance heat dissipation efficiency.

3. Surface treatment and grinding polishing

• Application of the characteristic: Utilizing its hardness second only to that of diamonds.

• Specific application: Widely used as a precision polishing agent, it is employed for surface grinding and surface finish treatment of metal bearings, glass products, semiconductor wafers, and high-end hardware components.

4. Chemical Industry and New Energy

• Application of characteristics: Utilizing its extremely large specific surface area and adsorption capacity.

• Specific applications: Used as an efficient catalyst carrier (such as in automotive exhaust purification catalysts), chromatography analysis adsorbent, and organic solvent dehydrating agent. In the field of new energy, it is used for coating the electrodes and separators of lithium batteries to enhance safety.

5. Optical and Special Function Materials

• Application of characteristics: Utilizing its infrared emission performance and optical properties.

• Specific application: As a far-infrared emitting material, it is used in chemical fiber products for health care textiles, and is also employed in the production of fluorescent materials, special optical glass, and filling agents for audio tapes.

Safety and Storage

Safety: Alumina is generally regarded as a stable and non-hazardous chemical. However, inhaling fine powder may cause irritation to the respiratory tract. It is recommended to wear a dust mask when operating.

Storage: It should be stored in a sealed container in a dry, cool and well-ventilated place. Avoid mixing it with acidic or alkaline substances and prevent it from getting damp and forming lumps.