Alumina powder product introduction and its application in grinding
April 30,2025
Alumina powder product introduction and its application in grindingAlumina powder (Alumina Powder) is a high-hardness, high-wear-resistant inorganic powder material with aluminum oxide (Al2O3) as the main component. It is widely used in high-tech fields such as grinding, polishing, electronic ceramics, optical components, and thermal conductive materials. Its unique physical and chemical properties make it one of the irreplaceable important materials in the field of precision grinding and ultra-precision polishing.
Alumina powder can be divided into many types according to its crystal form, morphology, purity and particle size. The common ones include:
High-purity alumina powder (Purity ≥ 99.99%): used in the electronics and optical industries that are extremely sensitive to impurities.
Spherical alumina powder: It has excellent fluidity and dispersibility, and is often used in thermal interface materials and electronic packaging materials. It is also suitable for uniform grinding requirements.
Flake alumina powder: The particle morphology is flake-like, which is conducive to improving the grinding contact area and efficiency. It is often used in the precision processing of glass and ceramics.
Submicron and nano-alumina powder: With extremely fine particle size and high specific surface area, it is suitable for ultra-precision polishing scenarios.
Alumina powder has the following main performance characteristics:
The Mohs hardness is as high as 9, second only to diamond and silicon carbide, and has excellent grinding ability;
Strong thermal stability, stable performance under high temperature conditions;
Controllable particle size, uniform distribution, support customization from tens of nanometers to tens of microns;
Strong chemical inertness, will not react chemically with most grinding substrates;
No scratches on the workpiece, high grinding efficiency, can improve the processing yield while ensuring the effect.
Alumina powder is widely used in the fine processing of optical glass, sapphire crystal, precision ceramics, metal surface, silicon wafer and other materials, and is a key material for a variety of grinding and polishing processes.
1. Precision removal of micro-layers on the surface of materialsThe high hardness and sharp particle edges of alumina powder can achieve stable removal of micron or submicron materials on the surface of the workpiece. Compared with other abrasives, alumina powder can achieve flatness and roughness control more efficiently.
2. Improved surface finishUnder low particle size conditions, alumina powder can be used as an ultra-fine grinding or terminal polishing medium to perform “traceless” treatment on the surface of mirror or optical-grade products, improve surface gloss and transmittance, and is often used in the final polishing of glass lenses, wafers, and sapphire substrates.
3. High processing accuracy and stable dimensional controlSince the particle size can be strictly controlled, the amount of material removed by alumina powder during the grinding process can be precisely controlled, which helps to achieve nano-level precision processing requirements and is suitable for ultra-precision manufacturing.
4. Adaptable to a variety of process systemsAlumina powder can be used in both water-based grinding fluids and oily polishing pastes. It can be well adapted to various types of grinding and polishing equipment, such as single-sided polishing machines, double-sided grinders, vibration polishing machines, etc., and has strong applicability.
5. Environmentally friendly and safe, with high stabilityAlumina powder itself is non-toxic and non-corrosive, and will not pollute the workpiece and the environment. At the same time, its chemical properties are stable and not easy to change during storage and use, which is suitable for large-scale stable industrial applications.
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