Alumina Ceramic Insulating Ring

Alumina Ceramic Insulating Ring is an annular insulating component made of high-purity alumina (Al₂O₃). Compared with insulating rings made of other materials (such as polymers or ordinary ceramics), the main difference and advantage of this product lies in its excellent comprehensive performance. Its core material properties give it extremely high electrical insulation strength, excellent mechanical hardness, excellent wear resistance, and excellent thermal shock resistance and high temperature stability (long-term use temperature can reach above 1600°C). This enables the alumina ceramic insulating ring to maintain stable insulation performance in extreme electrical and electronic environments with high temperature, high pressure, high frequency, strong corrosion or high reliability, effectively isolate current and protect sensitive components, and meet the application scenario requirements with strict requirements on the performance of insulating materials.

Main features and parameters (typical values):
Material composition: Al₂O₃ (92%, 95%, 99%, etc.)
Insulation strength: >15 kV/mm
Volume resistivity: >10^14 Ω·cm (room temperature)
Dielectric constant: ~9-10 (1MHz)
Coefficient of thermal expansion: ~7-8 x 10^-6 /K
Thermal conductivity: ~20-30 W/mK
Flexural strength: >300 MPa
Vickers hardness: ~1500 HV
Maximum operating temperature: >1500°C (long term)
Main uses:
Alumina ceramic insulation rings are widely used in fields requiring high-performance insulation and structural support:
Power electronics: high-voltage insulators, power transmission insulation parts, circuit breakers, disconnectors, IGBT module insulation substrates/gaskets, semiconductor manufacturing equipment.
Electronic components: vacuum tube (such as magnetron, klystron) insulation support, connector insulators, sensor insulation sleeves, thick film/thin film circuit substrates.
High temperature industry: furnace observation window, thermocouple protection tube, high temperature heating element support and insulation, molten metal processing equipment parts.
Vacuum technology: vacuum chamber feedthrough insulation, vacuum switch tube insulation ring, vacuum coating equipment parts.
Laser and optics: laser gas discharge tube insulation ring, optical platform support insulation.
Medical equipment: insulation components in some high-energy medical equipment (such as X-ray tubes).
Aerospace and defense: high-frequency and high-voltage insulation parts in radar systems and communication equipment.