Fused alumina's main application areas are concentrated in high-performance industrial manufacturing. Due to its high hardness, high purity, excellent thermal stability, and chemical inertness, it has become a core basic material in many key industries.
Abrasives (Core Application)
Fused alumina is the cornerstone of the abrasive industry, widely used in various grinding, cutting, and polishing tools:
Bonded abrasives: As the main abrasive in grinding wheels, cutting discs, and grinding heads, used for grinding and finishing metals, ceramics, and glass.
Coated abrasives: Used in sandpaper and abrasive belts for surface treatment of high-hardness materials such as stainless steel and cemented carbide.
Sandblasting: Utilizing its high hardness and sharp edges, it is used for sandblasting cleaning, rust removal, oxide scale removal, and surface roughening treatment of metal workpieces before coating.
Precision Polishing: Ultrafine fused alumina powder (e.g., 4000 mesh) is used for chemical mechanical polishing (CMP) of optical glass, semiconductor wafers, and sapphire screens to achieve nanoscale smoothness.
Refractory Materials (High-Temperature Industrial Support)
Fused alumina is a key aggregate in high-end refractory materials, used in extreme high-temperature environments:
Metallurgical Industry: Used in the manufacture of refractory bricks and castables for blast furnaces, electric furnaces, and ladle linings, resisting erosion by molten metal and slag.
Glass Industry: Used in critical components of glass kilns, such as pool walls, flow channels, and feeders, resisting the scouring and chemical corrosion of high-temperature molten glass.
Ceramics and Cement Industry: Used as lining material for high-temperature kilns, ensuring long-term stable operation.
Electronics and Semiconductor Industry
High-purity fused alumina (such as white corundum) is a core raw material for electronic ceramics:
Electronic substrates and packaging: Used to manufacture integrated circuit (IC) substrates, ceramic housings, insulators, etc., utilizing its high insulation, low dielectric loss, and good thermal conductivity.
Semiconductor equipment: Used to manufacture components for plasma etching chambers, requiring extremely high material purity to avoid wafer contamination.
Other electronic components: Used to manufacture spark plugs, sensors, radar radomes, etc.
Ceramics and Composite Materials
Structural ceramics: Used to manufacture highly wear-resistant and corrosion-resistant mechanical parts, such as bearings, seals, cutting tools, artificial joints, and dental implants.
Composite materials: Used as a reinforcing phase, combined with metals or resins to prepare new high-strength, high-wear-resistant composite materials for applications in the aerospace and automotive industries.
