Calcined Alumina
Description
Technical Parameters
Products Description
Calcined alumina is a high-purity material made by precise high-temperature calcination of industrial alumina or aluminum hydroxide at 1250 ° C-1450 ° C. Unlike ordinary alumina powder, it undergoes strict temperature control and additive free sintering to complete the phase transition from gamma alumina to alpha alumina, achieving high crystallinity and stable crystal structure. Its Al ₂ O ∝ content is as high as 99.5%, with ultra-low impurities and uniform particle size distribution. It is the core raw material for refractory materials, precision ceramics, electronic components, and polishing abrasives. And it has excellent thermal stability, chemical inertness, and mechanical hardness.
Technical data
It has stable and industry validated parameters that support its reliable performance in various industrial applications. All indicators are validated by third-party laboratories to ensure accuracy and consistency.
|
Type |
AL2O3 (%) |
SiO2 (%) |
Fe2O3 (%) |
Na2O (%) |
LOL (%) |
True Density (g/cm3) |
αConversion Rate % |
Average Grading(um) |
Primary Crystal Size um |
|
A10MP |
99.5 |
0.02 |
0.02 |
0.15 |
0.15 |
3.95 |
95 |
25 |
2-4 |
|
A30MP |
99.3 |
0.02 |
0.02 |
0.15 |
0.15 |
3.95 |
93 |
25 |
3-5 |
Product category
The product is divided into categories such as boron fluoride, pure fluoride, and no mineralizer according to the mineralizer formula. The fineness of alumina micro powder ranges from 325 mesh to 800 mesh. Its series includes dry pressing/isostatic pressing, hot die casting/injection molding, refractory materials, casting and shaping, and ceramic granulation powder. The dry pressing series has strong particle flowability and is suitable for high-density ceramics; Hot die casting series with high temperature and wear resistance; Refractory material series enhances thermal stability; Casting series enhances wear and corrosion resistance; Granulated powder is suitable for rapid prototyping of precision ceramics.
Advantages
1. Excellent thermal stability and high melting point
Calcined alumina can maintain stable structural integrity at temperatures up to 1600 ° C. Its fully crystalline alpha alumina structure can resist thermal decomposition and volume shrinkage under prolonged high temperature exposure. Unlike ordinary alumina powder that deforms or softens at 1000 ° C+, it can withstand extreme high temperatures and rapid thermal cycles, making it the preferred raw material for high-temperature refractory linings and kiln components.
2. Ultra high purity and low impurity content
With Al₂O₃ content up to 99.5% and ultra-low levels of SiO₂, Fe₂O₃, and Na₂O, Calcined Alumina Powder minimizes adverse reactions in downstream applications. Low iron content prevents discoloration in ceramic products, while low sodium content enhances high-temperature resistance and chemical stability.
3. Uniform particle size distribution
We offer customizable particle sizes ranging from 5 μ m to 50 μ m, with narrow distribution and no clumping. This controllable particle size can provide precise formulations for different applications: fine powder (5-25 μ m) is suitable for electronic ceramics and polishing agents, while coarse powder (25-50 μ m) is an ideal choice for refractory castables and wear-resistant fillers. The uniform particle size improves the compactness of the product and the mechanical strength of downstream processing.
4. Excellent mechanical hardness and wear resistance
The Mohs hardness of the product is 9, with excellent wear resistance and impact resistance. Its dense crystal structure can prevent particles from breaking under mechanical stress, making it a high-quality raw material for grinding media, wear-resistant coatings, and industrial ceramics. The service life of products made with this powder is 2-3 times longer than products made with ordinary alumina powder.
5. Excellent chemical inertness
It can resist corrosion from most acids, alkalis, organic solvents, and high-temperature gases (except hydrofluoric acid). It does not react with molten metal, slag, or corrosive flue gas, ensuring stable performance in harsh chemical environments. This chemical inertness makes it suitable for catalyst supports, chemical reactor liners, and corrosion-resistant ceramic components.
Application
Refractory Material
As the core raw material of advanced refractory materials, it is widely used in steelmaking ladle lining, cement kiln burner, glass kiln refractory materials, and industrial kiln components. It enhances the high temperature resistance, slag corrosion resistance, and thermal shock resistance of refractory products, extending the service life of the kiln by 30-50%. It is also a key component of amorphous refractory materials such as castables, ramming mixtures, and refractory mortar.
Precision ceramic industry
Calcined alumina is the main raw material for high-purity alumina ceramics, including electronic ceramics, structural ceramics, and daily-use ceramics. It is used for producing ceramic substrates, spark plug insulators, ceramic crucibles, and wear-resistant ceramic parts. Its high purity and uniform particle size improve the density, hardness, and insulation performance of ceramic products, meeting the strict requirements of the electronics and aerospace industries.
Electronic and electrical industry
It has good insulation performance and chemical stability, and can be used to manufacture electronic ceramic components, integrated circuit substrates, electronic packaging materials, etc., which can improve the performance and reliability of electronic devices.
Grinding and polishing industry
It has high hardness and uniform particle size, making it a high-quality abrasive material for grinding wheels, polishing agents, and sandblasting media. It is used for precision grinding of metals, glass, ceramics, and optical components, providing high surface smoothness and processing efficiency. Fine grained powder is an ideal choice for mirror polishing, while coarse-grained powder is suitable for heavy grinding and deburring.
Our packaging for calcined alumina comes in 50kg, 100kg, 1250kg, and the type of packaging can be customized according to customer requirements.
Why choose our HUAO's calcined alumina ?
1. Strict quality control throughout the entire process
Our products have implemented a five level quality management system, covering raw material inspection, production monitoring, finished product testing, and pre delivery validation. Each batch of products has been certified by a third-party laboratory. Screen out all non-conforming products to ensure 100% qualified delivery.
2. Customized solutions tailored to unique needs
We understand that different industries have different requirements for alumina powder. Our technical team provides one-on-one customized services to determine purity, particle size distribution, and impurity levels. Whether you need high-purity 99.5% electronic ceramics or standard 99.0% refractory materials, we will tailor products for you to maximize your application performance.
3. Stable production capacity and on-time delivery
With an annual production base of 20000 tons and 3 advanced automated production lines, we have maintained sufficient inventory for bulk orders (500+tons) and small-scale trial orders (50kg-1 tons). Standard orders are delivered within 7-15 days, and urgent orders are prioritized for production. We provide flexible packaging: small orders use 25kg moisture-proof woven bags, and bulk orders use 1MT container bags to prevent moisture absorption and damage during transportation.
FAQ
Q1: Can particle size be customized?
A1: Yes. We offer fully customized standard sizes (5 μ m, 10 μ m, 25 μ m, 50 μ m, etc.) and special sizes (such as 15 μ m, 30 μ m, etc.).
Q2: What is MOQ?
A2: The minimum order quantity for bulk orders is 1 tons. We also accept small batch trial orders (50kg-1 ton) for customers to test the quality before bulk procurement.
Q3: Does the product meet international quality standards?
A3: Yes. Our calcined alumina complies with ISO 9001, ASTM, and other international standards.
Please contact our team to provide the granularity distribution you need for a customized solution.
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