Platelet Calcined Alumina is a specialized form of aluminum oxide (Al₂O₃) characterized by its unique platelet-shaped morphology, which enhances mechanical, thermal, and wear-resistant properties in advanced ceramic and composite applications.
Key Features:
Platelet Morphology
Hexagonal platelet-shaped particles improve fracture toughness by deflecting cracks (similar to natural nacre or layered composites).
Enhances packing density in refractory and ceramic matrices.
High-Temperature Stability
Produced via calcination (typically above 1300°C), ensuring high purity (≥99%) and thermal stability up to ~1800°C.
Enhanced Mechanical Properties
Used as a reinforcing phase in composites to improve:
Wear resistance (e.g., cutting tools, abrasives).
Fracture toughness (e.g., armor ceramics).
Thermal shock resistance (e.g., refractory linings).
Applications:
Advanced Ceramics: Structural components, armor materials.
Refractories: High-temperature linings for furnaces.
Polishing & Coatings: Ultra-fine platelets for precision surfaces.
Polymer/Ceramic Composites: Reinforcing filler for improved strength.
Synthesis Methods:
Flame Spray Pyrolysis or Molten Salt Synthesis to control platelet geometry.
Calcination of Precursors (e.g., gibbsite or boehmite) with additives to promote platelet growth.
Advantages Over Spherical Alumina:
Better crack propagation resistance.
Improved sinterability in ceramics.
Higher anisotropy for tailored properties.
