High-performance Alumina Ceramic Rings Wear-resistant 95%-99% Alumina Ceramic Insulating Rings

Alumina ceramic insulating rings are annular structural components made from high-purity alumina (Al₂O₃, commonly 95% and 99% pure) ceramic. They are manufactured through dry pressing, isostatic pressing, or slip casting, followed by sintering at temperatures exceeding 1600°C.

They are designed to physically isolate two or more conductive components, preventing current flow between conductors at different potentials, thereby ensuring equipment safety, preventing short circuits, and reducing signal interference.

The performance of alumina ceramic insulation rings perfectly meets the requirements of high-end insulation applications:
1. Excellent electrical insulation - their core advantage. They have an extremely high resistivity (>10¹⁴ Ω·cm) at room temperature, making them an excellent insulator.
2. Excellent high-temperature resistance. They can withstand long-term operating temperatures of up to 1400-1500°C and exhibit excellent thermal stability, enabling stable operation in high-temperature environments.
3. High mechanical strength and rigidity. They have extremely high compressive strength (>2000 MPa), capable of withstanding significant pressure and tightening forces. It can serve as a structural support in high-voltage systems, providing insulation and maintaining stability in its installation location.
4. Excellent chemical stability. Resistant to strong acids, alkalis, and organic solvents, it never rusts or ages. Suitable for use in humid and corrosive environments, its lifespan far exceeds that of other materials.
5. Low thermal expansion coefficient. Its relatively low coefficient of thermal expansion (~7-8 × 10⁻⁶/°C) minimizes dimensional change with temperature.

Alumina ceramic insulating rings are widely used in nearly every industrial sector requiring reliable insulation:
1. Power transmission and distribution and electrical equipment (core application)

• High-voltage switchgear and vacuum circuit breakers: Used to support and insulate conductive rods, isolating components at different potentials, and are critical structural components for ensuring safe equipment operation.
• Insulators: Used in power transmission and distribution lines and substation equipment as insulators and wall bushings.
• Channels and transformers: Serving as part of internal insulation structures.

2. Electronics and semiconductor manufacturing

• Semiconductor process equipment (CVD, PVD, etchers): Used within reaction chambers to secure and insulate components such as electrodes and heaters, requiring resistance to plasma bombardment.
• Microwave tubes and lasers: Serving as vacuum-sealed insulating rings, achieving both electrical isolation and structural connection.

3. New energy and electric vehicles

• Fuel cells (stacks): Located between bipolar plates, they provide multiple functions, including insulation, sealing, and gas flow formation.
• Power battery packs: Used in battery modules as insulating spacers between cells, preventing short circuits and withstanding pressure. 
• IGBT power modules: Serves as a component of the insulating backing plate (DBC substrate) or as an insulating spacer ring within the module.

4. Industrial Heating and High-Temperature Equipment

• Electric furnaces and heating rods: Used to isolate the heating element (such as a silicon-molybdenum rod) from the metal furnace shell to prevent leakage and withstand the high temperatures within the furnace.
• Thermocouples and temperature sensors: Serves as an insulating sheath to protect the metal conductors within.

5. Aerospace and Defense

• High-Reliability Electronic Equipment: Provides lightweight, high-strength insulation solutions for airborne and missile-borne electronic equipment.
• Sensor Housings: Used in sensors requiring hermetic sealing.