Excerpt:
Calcined Alumina is a commercial Alumina or Aluminum Oxide. It is white powder. One of the outstanding characteristics of Calcined Alumina is its hardness which is 9 on mohs scale.
Calcined alumina is widely used as a polishing agent due to its high hardness and thermal stability. When used in fine polishing applications(calcined alumina polishing), it ensures superior surface finishes on metals, ceramics, and optical components.
Calcined Alumina is produced by high-quality raw materials at high temperature, with characteristics of high conversion rate, stable crystallization and low impurity content.
The product has excellent performance of high mechanical strength, stable shrinkage rate, good electrical insulation, high attrition resistance, outstanding corrosion resistance and high temperature resistance.
Product Features
·High grade refractories ·Fine ceramics
·Electronic components ·Wear-resistant alumina ceramics
Identification of grades
1) Calcined Aluminum S-100 grades: White granular free flowing powder passes through 150 m.
2) Calcined Aluminum S-300 grade: White superfine powder passes though 45 micron.
3) Calcined Alumina SCM grade: It is finally ground grades consisting entirely of superfine passes through 45 micron.
4) Calcined Alumina S-300 PT: It is finely ground grade consisting entirely of superfine with surface treated.
Uses
Use as a bedding material in the heat treatment of special alloy steels, It is use as a fluxing medium in the meeting of special steels as a component of low expansion glass. It is use as a constituent of special china dazes & it is use as a raw material for the manufacture of dental porcelains. It is use for refractory application such as electrical insulators. It is use as a abrasive resistant. It is use glazing ceramic tiles.
Low Soda Calcined Alumina
Characteristics: with high quality raw materials and advanced production technology, the products have the advantages of low sodium oxide, high conversion rate and fine particle morphology.
Application: all kinds of abrasives, abrasives and various wear-resisting filler, various ceramic and refractory alumina micro-powder, high purity structure ceramics, electronic components, high frequency insulating porcelain.
| Brand | Chemical composition（%） | α-Al2O3 | Effective density | Primary crystal size | ||||
| Al2O3 ≥ | SiO2 ≤ | Fe2O3≤ | Na2O≤ | L.O.I≤ | % ≥ | ≥ | μm | |
| AC-200MS | 99.0 | 0.10 | 0.04 | 0.2 | 0.2 | 93 | 3.93 | 2.5±1 |
| AC-200MS | 99.0 | 0.10 | 0.04 | 0.2 | 0.2 | 94 | 3.93 | 4±1 |
| Brand | Chemical composition（%） | α-Al2O3 | Particle size | ||||
| Al2O3≥ | SiO2≤ | Fe2O3≤ | Na2O≤ | L.O.I≤ | %≥ | μm | |
| ACG-200MS | 99.0 | 0.20 | 0.04 | 0.2 | 0.2 | 92 | 1-2 |
| ACG-200MS | 99.0 | 0.20 | 0.04 | 0.2 | 0.2 | 93 | 3-5 |
Fine Powder Of Low Soda Calcined Aluminua (Tunnel Kiln)Fine Powder Of Low Soda Calcined Alumina
Characteristics: the products have the advantages of high conversion rate, controllable crystal morphology, good thermal shock resistance, stable high temperature performance and stable shrinkage rate of products.
Application: it is widely used in advanced refractories, structural ceramics, functional ceramics, metal composite ceramics, thermal conductive ceramics and other fields.
| Brand | Chemical composition（%） | α-Al2O3 | BET | Particle size | ||||
| Al2O3≥ | SiO2≤ | Fe2O3≤ | Na2O≤ | L.O.I≤ | %≥ | m2/g | μm | |
| AC-10LS | 99.5 | 0.1 | 0.04 | 0.1 | 0.2 | 93 | 4-7 | ≤1 |
| T1 | 99.5 | 0.1 | 0.04 | 0.1 | 0.1 | 95 | 1.6-2.0 | 2.5-3.2 |
| T2 | 99.5 | 0.1 | 0.04 | 0.1 | 0.1 | 95 | 1.2-1.5 | 4.0-5.5 |
| T3 | 99.5 | 0.1 | 0.04 | 0.1 | 0.1 | 95 | 1.3-1.6 | 3.5-4.5 |
| T4 | 99.5 | 0.1 | 0.04 | 0.1 | 0.1 | 95 | 1.5-3.5 | 2.0-3.0 |
Frequently Asked Questions about Calcined Aluminium Oxide for Polishing
1. What is calcined alumina used for in polishing?
Calcined alumina is used as a polishing agent for metals, ceramics, glass, and electronic components. Its hardness and thermal stability make it ideal for achieving fine, uniform finishes.
2. How is calcined alumina different from fused alumina?
Calcined alumina is produced by heating aluminum hydroxide without melting it, resulting in a porous, fine-grain structure. Fused alumina, by contrast, is melted at high temperatures, making it denser and more aggressive in polishing.
3. What particle size of calcined alumina is best for fine polishing?
Fine polishing typically requires calcined alumina with particle sizes ranging from 0.3 µm to 3 µm. Banlan Chem offers customized grades to meet different surface finish requirements.
4. Is calcined alumina suitable for automated polishing systems?
Yes. Calcined alumina is widely used in automated and semi-automated polishing systems due to its consistent particle size and flow characteristics.
5. Can calcined alumina be used for polishing hard materials like sapphire or ceramics?
Absolutely. Its high Mohs hardness (9+) allows calcined alumina to effectively polish tough materials such as sapphire, alumina substrates, and technical ceramics.
6. What purity levels are available for polishing-grade calcined alumina?
Banlan Chem supplies high-purity calcined alumina with purity levels up to 99.9%, ensuring minimal contamination for precision polishing processes.
7. Does calcined alumina leave any residue after polishing?
No. When used properly, calcined alumina produces a clean finish with minimal residue, making it ideal for electronics, optics, and medical applications.
8. How to store and handle calcined alumina powder?
Calcined alumina should be stored in a dry, sealed container at room temperature. Avoid exposure to moisture and handle in a dust-controlled environment.
