Product Name: Wear-Resistant & High-Insulation Alumina Ceramic Sleeve
Product Material: 99.5% - 99.8% High-Purity Alumina ($Al_2O_3$), optional glaze coating for moisture resistance.
Material Characteristics: Extreme surface hardness (HRA 85-90), Superior dielectric strength (>10 kV/mm), High temperature endurance (up to 1700°C), Exceptional chemical corrosion resistance, Low thermal expansion coefficient, Mirror-finish capability (Ra < 0.1μm).
Application Fields: High-voltage cable lead-throughs, Corona treatment rollers, Plasma torch insulators, Inductive heating coil sleeves, Wire drawing pulleys/guides, Centrifugal pump shaft protection, Insulating spacers for vacuum furnaces.
Application Industries: Biomedical (High-purity liquid handling), Advanced Machinery (Precision wear parts), New Energy (Lithium battery electrode insulation), Fluid Control (Abrasive media pumping), Electronic Engineering (High-frequency power systems), Aerospace (Sensor insulating sleeves), Petrochemical (Corrosive fluid delivery), Broad Semiconductor (CVD/PVD insulation).
Processing Difficulties: Achieving perfect concentricity for high-speed rotation, Managing strict wall thickness tolerances to ensure uniform electrical field distribution, Preventing micro-cracking during internal diamond grinding which could lead to electrical breakdown, Controlling surface finish to minimize friction with moving parts.
Processing Flow: Powder granulating → Cold Isostatic Pressing (CIP) → Pre-sintering green machining → Ultra-high temperature sintering → Precision diamond grinding (ID/OD) → Final honing and polishing → 100% dielectric strength testing → Dimensional verification → Secure packaging.
Delivery Period: Standard specifications: 15-25 days, Customized high-precision or large-scale sleeves: 30-45 days.
Our Alumina Wear-Resistant Insulating Sleeves are engineered for environments where mechanical friction and high-voltage stress occur simultaneously. By utilizing 99% high-purity Alumina, these sleeves provide a robust physical barrier that is nearly impervious to abrasive wear. Beyond its mechanical strength, the material acts as a superior electrical insulator, preventing arcing and leakage even at elevated temperatures. These sleeves are the ideal solution for protecting sensitive shafts and electronic components in plasma, induction, and chemical processing equipment, offering a significant performance leap over industrial polymers and specialty steels.
Key Features:
Dual Performance: Combines extreme mechanical hardness with top-tier electrical resistivity.
Thermal Shock Stability: Maintains its shape and insulating properties through rapid temperature fluctuations.
Non-Conductive Surface: Completely eliminates the risk of eddy currents and electrical tracking.
Friction Reduction: Mirror-polished ID/OD reduces energy loss and extends the life of contacting components.
Corrosion Resistance: Inert to most industrial acids and oxidizers, ensuring no contamination in high-purity processes.
