Design FeaturesAlumina ceramic rings (high-temperature resistant pressure-resistant bushings, high-frequency industrial ceramic rings) are made of high-purity alumina 

material, exhibiting excellent mechanical and thermal properties. Firstly, these ceramics possess extremely high hardness and compressive strength 

(hardness 82 Rockwell, compressive strength up to 2000 MPa), allowing them to maintain shape and dimensional stability even under extreme conditions. 

Secondly, their extremely low water absorption (0%) and air permeability (0%) ensure excellent performance even in humid environments. Furthermore, their 

good thermal conductivity and thermal shock resistance (thermal conductivity 27.5 W/(m·K), thermal shock resistance ΔT℃ 200) enable stable operation in 

high-temperature environments without easily being damaged.

These rings have a relatively low coefficient of thermal expansion (7.6 x 10⁻⁶/℃), resulting in minimal expansion and contraction with temperature changes, 

which is beneficial for applications requiring precise dimensional control. In terms of electrical properties, alumina ceramics exhibit excellent electrical insulation 

properties, with a volume resistivity as high as 10¹⁴ Ω·cm, making them suitable for electrical insulation and other demanding electrical applications.

Application areas

Alumina ceramic rings are widely used in various demanding industrial fields. In aerospace, they are used to manufacture components resistant to high 

temperatures and pressures, such as engine parts and thermal protection systems. In semiconductor manufacturing, these rings are often used to manufacture 

insulating components for equipment, protecting sensitive electronic components from high temperatures and electromagnetic interference. Furthermore, 

due to their high-frequency characteristics, these rings are also suitable for high-frequency electronic equipment, such as radar and communication 

equipment.

In the energy industry, particularly in nuclear and solar energy, alumina ceramics are used as critical structural and insulating materials due to their 

high-temperature stability and radiation resistance. In addition, due to their high chemical resistance and abrasion resistance, they are also widely used in 

equipment in the chemical and mining industries, such as pumps, valves, and sensors.