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High Frequency Insulation​ Ceramics

High Frequency Insulation Ceramics


 

Alumina/Aluminum Oxide (Al2O3)

Alumina or aluminum oxide (Al2O3) in its various levels of purity is used more often than any other advanced ceramic material. CeramTec offers a wide range of material types with different property profiles that can be adjusted via a targeted matrix design.



Worth knowing:

Properties of Alumina/Aluminum Oxide (Al2O3)

  • Very good electrical insulation (1x1014 to 1x1015 Ωcm)
  • Moderate to extremely high mechanical strength (300 to 630 MPa)
  • Very high compressive strength (2,000 to 4,000 MPa)
  • High hardness (15 to 19 GPa)
  • Moderate thermal conductivity (20 to 30 W/mK)
  • High corrosion and wear resistance
  • Good gliding properties
  • Low density (3.75 to 3.95 g/cm3)
  • Operating temperature without mechanical load 1,000 to 1,500°C.
  • Bioinert and food compatible

Aluminiumoxid Gefügebild

Aluminiumoxid Gefügebild

There are both coarse and fine-grained varieties. Examples of applications for aluminum oxide Al2O3 advanced ceramics are heavy-duty forming toolssubstrates and resistor cores in the electronics industry, tiles for wear protection and ballistics, thread guides in textile engineeringseal and regulator discs for water taps and valves, heat-sinks for lighting systems, protection tubes in thermal processes or catalyst carriers for the chemicals industry.



 


Early developments in the field of technical ceramics began with the use of silicate ceramics for electrical insulation. Silicate ceramics are manufactured for the most part from natural raw materials.



Silicate Ceramics




Worth knowing:

Properties of Silicate Ceramics

  • Very good electrical insulation (1x1010 to 1x1013 Ωcm)
  • Minimal to moderate linear expansion 
    (0.4x10-6K-1 to 6x10-6K-1)
  • Excellent thermal shock resistance (250 to 610 K)
  • Low thermal conductivity (2 to 4 W/mK)
  • Flexural strengths from 80 to 180 MPa

Very different types of multiphase ceramics can be produced with different properties by varying the type and quantity of raw materials. Silicate ceramic materials include:

  • Porcelains: Alkali – aluminum silicates (Typ C140)
  • Steatites: Magnesium silicates 
    (Type C221, 230)
  • Cordierites: Alkaline earth – silizium silicates 
    (Type C410, C520, C530)
  • Mullites: Alumina-silicon oxide compositions 
    (Type C610, C620/C780)

Silicate ceramic components are used in electronics and electrical engineering and act as electrical insulation in fuses, circuit breakers, thermostats and in lighting technology. The ability of silicate ceramic materials to provide thermal insulation is also utilized in heating, environmental and thermal engineering applications. Porous components are produced for the emission of fragrances and insecticides, as carriers for catalysts or for various applications in laboratories.


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