Product Name: Wear-Resistant & High-Insulation Alumina Ceramic Sleeve
Product Material: 95% - 99.8% High-Purity Alumina ($Al_2O_3$), optional glaze coating for enhanced surface hydrophobicity.
Material Characteristics: Diamond-grade surface hardness (Mohs 9), High dielectric strength (>15 kV/mm), Excellent thermal stability (up to 1700°C), Exceptional chemical resistance, Low thermal expansion coefficient, Zero electrical tracking.
Application Fields: High-voltage wire guides, Plasma torch insulators, Corona treatment rollers, Induction heating coil liners, Centrifugal pump shaft protectors, Insulating spacers for vacuum furnaces, High-speed wire drawing bushings.
Application Industries: Biomedical (Sterile liquid pumps), Advanced Machinery (Precision spindles), New Energy (Lithium battery electrode processing), Fluid Control (Abrasive slurry handling), Electronic Engineering (RF/Microwave equipment), Aerospace (Sensor insulating sleeves), Petrochemical (Corrosive fluid injection), Broad Semiconductor (Etch and CVD tools).
Processing Difficulties: Maintaining high concentricity between internal and external diameters to prevent vibration, Achieving sub-micron wall thickness uniformity for consistent electrical insulation, Minimizing surface micro-cracks during diamond grinding to avoid dielectric breakdown, Achieving mirror-finish roughness (Ra < 0.1μm) to reduce seal friction.
Processing Flow: Powder preparation → Cold Isostatic Pressing (CIP) → Green machining → High-temperature sintering → Precision diamond grinding (ID/OD) → Honing and mirror polishing → 100% Dielectric strength testing → CMM dimensional verification → Secure packaging.
Delivery Period: Standard specifications: 14-25 days, Customized high-precision or extra-long sleeves: 30-45 days.
Our Wear-Resistant Insulating Alumina Sleeves are the premium solution for applications where mechanical friction and electrical stress intersect. Utilizing 99% high-purity alumina, these sleeves provide a surface harder than hardened steel, effectively resisting abrasive particles in the fluid or mechanical stream. Simultaneously, the material acts as a world-class electrical insulator, preventing arcing and leakage even in high-temperature or high-frequency environments. Designed for long-term reliability, these sleeves significantly reduce maintenance downtime by protecting shafts and components from both wear-induced scarring and electrical failure.
Key Features:
Dual-Function Performance: Combines extreme wear resistance with superior electrical resistivity.
Corrosion & Erosion Immunity: Completely inert to industrial acids and oxidizers, ensuring no particle contamination.
High Thermal Endurance: Maintains critical insulating properties and structural shape at temperatures exceeding 1000°C.
Zero Creep & Friction: Precision-polished surfaces minimize energy loss and heat generation during operation.
Dielectric Integrity: Optimized wall thickness and density ensure uniform performance in high-voltage fields.
