White Fused Alumina Block
Overview
White fused alumina block is a synthetic abrasive material produced by melting high-purity calcined alumina in electric arc furnaces. It is characterized by its white crystalline structure and exceptional hardness, ranking 9 on the Mohs scale. The material is widely recognized for its high thermal stability and resistance to chemical corrosion. The production process involves carefully controlled cooling to ensure uniform crystal formation, resulting in a product with consistent mechanical properties. Due to its purity and performance, white fused alumina block is a preferred choice in industries requiring precision abrasives and high-temperature resistant materials.
Physical and Chemical Properties
White fused alumina block exhibits a density of approximately 3.95 g/cm³ and a melting point of 2050°C, making it suitable for high-temperature applications. Its high thermal conductivity and low thermal expansion coefficient contribute to its stability under extreme conditions. Chemically, it is inert to most acids and alkalis, except for hydrofluoric acid and phosphoric acid at elevated temperatures. The material's hardness and toughness make it ideal for abrasive applications, where it outperforms many natural abrasives in terms of durability and cutting efficiency.
Main Applications
The primary use of white fused alumina block is in the manufacturing of bonded and coated abrasives, including grinding wheels, sandpaper, and cutting tools. Its high purity makes it particularly suitable for precision grinding and polishing of high-performance alloys and ceramics. In the refractory industry, it serves as a key component in linings for furnaces and kilns, offering excellent resistance to thermal shock and chemical attack. Additionally, it finds applications in precision casting as a molding material and in the production of advanced ceramics for electronic components.
Safety and Storage
While white fused alumina block is chemically stable, proper handling procedures should be followed to minimize exposure to dust particles. Respiratory protection is recommended when processing the material to prevent inhalation of fine particles. Storage should be in dry, well-ventilated areas with protection from moisture. The material is non-flammable and non-reactive under normal conditions, but contact with strong acids should be avoided. Proper labeling and segregation from incompatible materials are essential for safe storage.
B2B Procurement Guide
When procuring white fused alumina block, buyers should specify the required Al₂O₃ content (typically 99% or higher) and particle size distribution. The material is commonly available in various grain sizes, from coarse blocks to fine powders. Quality certifications such as ISO 9001 should be verified, along with the supplier's ability to provide consistent chemical composition and physical properties. Bulk shipments are common, with prices varying based on purity, size, and order volume. Long-term supply agreements are recommended for stable pricing and consistent quality.
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