Factory Direct High Temperature Calcined Alumina Powder For Global Buyers
Description
As a professional manufacturer and supplier of calcined alumina, we provide a full range of high-quality calcined α alumina products, including coarse powder, fine powder, low-sodium variants, and products processed by rotary kiln and tunnel kiln. Our calcined α alumina is meticulously crafted from premium alumina raw materials, undergoing precise high-temperature calcination and strict quality control to achieve excellent physical and chemical properties. It is widely used in high-temperature refractory materials, advanced electronic ceramics, lithium battery separator coating, abrasive tools and polishing materials, and other industrial fields, serving global customers with reliable performance and customized solutions.
Calcined Alumina Features & Core Advantages
Our calcined α alumina series stands out in the industry with its outstanding comprehensive performance, supported by advanced production technology and strict quality management systems:
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High Purity & Stable Composition: The Al₂O₃ content ranges from 99.0% to 99.9%, with strictly controlled impurity content. Low-sodium products have Na₂O content ≤0.2% (even ≤300ppm for tunnel kiln variants), effectively avoiding performance degradation caused by impurities in high-temperature and high-precision applications. Suitable for high-purity structural ceramic production and low-sodium electronic component materials.
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Controllable Particle Size & Crystal Morphology: Through optimized calcination process and grading technology, the particle size distribution (D50: 0.6μm-6μm) is uniform, and the primary crystal size is adjustable. The crystal structure is stable and well-developed, ensuring excellent sintering activity and shrinkage stability for precision ceramic molding and refractory binder preparation.
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Excellent High-Temperature & Chemical Stability: With high hardness (Mohs hardness 9), good wear resistance, and thermal stability (melting point up to 2072℃), it can withstand extreme high-temperature environments without obvious performance attenuation. It is chemically inert, not easy to react with acids, alkalis, and other substances, making it ideal for high-temperature furnace refractory linings and corrosion-resistant industrial fillers.
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Batch-to-Batch Consistency: Adopting advanced rotary kiln and tunnel kiln production lines, with full-process automated control from raw material feeding to finished product packaging. Each batch of products undergoes strict inspection, ensuring consistent performance and meeting the mass production needs of large-scale industrial manufacturers and high-precision component suppliers.
Calcined Alumina Full Product Range & Target Applications
We offer five core product variants to cover diverse industrial needs, each tailored to specific application scenarios with targeted performance optimization:
1. Coarse Powder of Calcined Alumina
Key Advantages: High conversion rate, stable crystal structure, good fluidity, and cost-effectiveness. It is a cost-efficient foundational raw material for industrial production.
Target Applications: Abrasive tools and wear-resistant fillers, refractory bricks and unshaped refractory castables, raw material for ceramic-grade and refractory-grade alumina fine powder, high-alumina structural ceramics, and industrial ceramic grinding media.
2. Fine Powder of Calcined Alumina
Core Specifications: Al₂O₃ ≥99.2%, Na₂O ≤0.3%, median particle size D50 3-6μm (grade: A-CG-2A), particle size customizable.
Key Advantages: Large specific surface area, high sintering activity, and stable shrinkage rate, which can significantly improve the density and mechanical strength of finished products.
Target Applications: Refractory material binders, high-alumina ceramic glazes and bodies, precision polishing raw materials for metal and glass, electronic ceramic substrates, and paper coating fillers.
3. Low Sodium Calcined Alumina (Coarse Powder)
Core Specifications: Al₂O₃ ≥99.3%, Na₂O ≤0.2% (≤0.1% for AC-05LS), α-Al₂O₃ ≥90%, primary crystal size ≤3μm (grades: A-C-180-RLS, A-C-200MS, A-C-300MS, A-C-300LS, AC-05LS).
Key Advantages: Ultra-low sodium content inhibits glass phase formation at high temperatures, ensuring dimensional stability and electrical insulation performance of products in extreme environments.
Target Applications: High-frequency insulating ceramics, specialty glass and optical glass raw materials, high-purity structural ceramics, vacuum coating materials, and high-performance refractory materials for the metallurgical industry.
4. Low Sodium Calcined Alumina Fine Powder (Rotary Kiln)
Core Specifications: Al₂O₃ ≥99.3%, Na₂O ≤0.2% (≤0.1% for A-CG-300LS), median particle size D50 1-6μm (grades: A-CG-200MS, A-CG-300MS, A-CG-300LS), particle size customizable.
Key Advantages: Produced by rotary kiln technology, with uniform particle size distribution, excellent batch consistency, and good thermal stability.
Target Applications: Advanced refractory materials for petrochemical furnaces, high-grade electronic ceramics, functional ceramic components, thermal conductive plastic fillers, and wear-resistant ceramic linings.
5. Low Sodium Calcined Alumina Fine Powder (Tunnel Kiln)
Core Specifications: Al₂O₃ ≥99.9%, Na₂O ≤300ppm, median particle size D50 0.6-1.1μm, pH value 7-8 (grades: A-C-06-LS, A-C-1-LS).
Key Advantages: Made from special raw materials, with low specific surface area, excellent dispersibility, controllable crystal morphology, and superior thermal shock resistance. It is a high-end functional material for precision industries.
Target Applications: Lithium battery separator coating materials, 5G communication ceramic filters, biomedical ceramics, metal matrix composite ceramics, and high-precision thermal conductive ceramics.
Why Choose Our Calcined Alumina?
We are committed to providing customers with high-quality calcined α alumina and one-stop material solutions, with the following competitive advantages:
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Source Factory Strength: Own independent R&D and production bases, equipped with large-scale rotary kilns and tunnel kilns, realizing full-process control from raw material procurement to finished product delivery, and eliminating intermediate supply links to ensure cost advantages and quality stability.
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Customized Solution Capability: We provide personalized product customization services tailored to customer needs, including particle size distribution, purity grade, sodium content control, and packaging specifications, to meet the unique requirements of various industrial scenarios.
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Strict Quality Control: Establish a comprehensive quality inspection system, utilizing advanced testing equipment to inspect Al₂O₃ content, Na₂O content, particle size distribution, crystal structure, and other key indicators for each batch of products, with traceable quality records.
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Global Supply & Technical Support: Professional logistics team supports FCL, LCL, and air freight, covering global markets such as Europe, America, Southeast Asia, and the Middle East. Our team of material engineers provides one-on-one technical guidance, including formula optimization, process improvement suggestions, and application scenario adaptation.
Calcined Alumina Packaging & Logistics
Packaging Specifications: 50kg/bag (plastic-lined woven bag, moisture-proof and anti-static) or 1000kg/big bag (FIBC bag, with inner liner), customizable packaging for bulk orders.
Logistics Services: support EXW, FOB, CIF, and other trade terms. Fast response to orders, with stock available for standard grades, ensuring timely delivery for customers’ production needs.
Calcined alumina Characteristics Index:
| Brands | Al2O3 ≥ % | SiO2 ≤ % | Fe2O3 ≤ % | Na2O ≤ % | LOI % ≤ | Effective Density (g/cm³) ≥ | α-Al2O3 ≥ % | Particle Size (μm) |
|---|---|---|---|---|---|---|---|---|
| A-C-30 | 99 | 0.1 | 0.02 | 0.35 | 0.1 | 3.92 | 92 | 0.6-1.2 |
| A-C-30-A | 99.3 | 0.1 | 0.04 | 0.4 | 0.2 | 3.93 | 93 | 2.5±1 |
| A-C-40-MS | 99.3 | 0.1 | 0.04 | 0.2 | 0.2 | 3.91 | 91 | 2±1 |
| A-C-30M | 99.3 | 0.1 | 0.04 | 0.2 | 0.2 | 3.90 | 90 | ≤2 |
Contact Us
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