Product Name: Ceramic Insulation Ring
Product Material:
High-Purity Alumina Ceramic (Al₂O₃ 95%-99.5%), with Aluminum Nitride (AlN) optional for critical areas
Material Characteristics:
High dielectric strength (>15 kV/mm), Excellent volume resistivity (>10¹² Ω·cm), High mechanical strength and stiffness, Good arc resistance and comparative tracking index (CTI > 600 V), Low dielectric constant and loss factor, Outstanding thermal stability and thermal shock resistance, Chemical corrosion and UV aging resistance, Low coefficient of thermal expansion (compatible with various metals), High surface resistivity
Application Fields:
Arc chambers and insulating pillars for high-voltage switches/circuit breakers, Insulating slot wedges and end rings for motors and generators, Insulating bobbins and bushings for transformers, Insulating sleeves and heat spreader substrates for power electronic modules, Insulating housings for electrical connectors, Protective sleeves for sensors
Application Industries:
Power transmission and distribution equipment, Industrial motors and drives, New energy vehicles (e-drive, charging piles), Rail transportation (traction systems), Renewable energy (PV inverters, wind power converters), Aerospace electrical systems, High-end appliances and power tools
Processing Difficulties:
Ensuring sintering uniformity and minimal deformation for large ring-shaped components, Achieving high-precision coaxiality/parallelism of inner/outer circles and end faces, Controlling sintering crack risk in thin-walled structures, Guaranteeing adhesion strength and thermal shock resistance of surface metallization (e.g., silver paste), Avoiding micro-cracks during processing that degrade insulation performance, Meeting design requirements for creepage distance and electrical clearance under specific operating conditions.
Processing Flow:
Powder batching and granulation → Dry pressing or cold isostatic pressing → Sintering under controlled atmosphere → Rough grinding of profile → Precision CNC internal/external cylindrical grinding → Face grinding → Chamfering and deburring → Ultrasonic cleaning → Performance inspection (dimensions, roundness) → Surface treatment (glazing, metallization, laser marking, optional) → Electrical performance sampling (insulation resistance, withstand voltage) → Moisture-proof packaging
Delivery Period:
Standard specifications and materials: 25-40 days
Custom specifications / high-performance materials / requiring surface metallization: 45-70 days
Ceramic Insulation Rings are fundamental core components in modern electrical equipment, serving for circuit isolation, mechanical support, and thermal management. Under conditions of high voltage, high frequency, high temperature, and harsh environments, their performance directly impacts the reliability, safety, and service life of the entire electrical system. Manufactured from advanced engineering ceramics like high-purity alumina, these insulation rings perfectly replace traditional materials such as plastics, mica, or ordinary glazed insulators with their superior and balanced electrical, mechanical, and thermal properties, making them the preferred choice for high-performance electrical design.
Key Features:
Excellent and Stable High Insulation Performance – Possesses extremely high dielectric strength and volume resistivity, effectively isolating high voltage and preventing leakage and breakdown. Their performance shows minimal degradation under high temperature, high humidity, and long-term electric field exposure, ensuring the safe and stable operation of electrical equipment throughout its entire lifecycle.
Outstanding Mechanical Strength and Dimensional Stability – Maintains precise shape and position even under high mechanical stress or vibration, providing stable support for electrical connections. Their low coefficient of thermal expansion facilitates reliable matching with metal components, reducing thermal cycling stress.
Superior Environmental Durability and Long Service Life – The material is inherently non-flammable, corrosion-resistant, and aging-resistant, capable of long-term use in harsh environments outdoors, in chemical industries, or at high temperatures. Their arc resistance and high comparative tracking index (CTI) make them particularly reliable in applications prone to electrical arcing, significantly enhancing equipment safety.
