Electrotechnical ceramics has an exceptional set of properties:

  • excellent electrical insulation properties;
  • corrosion resistance;
  • resistance to high temperatures (while maintaining the insulation properties)

 

These combinations make materials irreplaceable for production various parts in electrical engineering.

 

Main applications:

  • housings, tubes, fuse cores;
  • ceramics for lighting systems;
  • components for resistors and rheostats;
  • houses of high-temperature heaters, thermocouple covers;
  • various electrical insulators.

Main properties of materials:

Properties Group alkali aluminum silicates magnesium silicates magnesium aluminum silicates mullite-corundum high-alumina material
Group name 100 200 400 500 600 700
Subgroup name 110 111 120 130 221 410 520 530 610 786 795 799
Open porosity, % 0 3 0 0 0 0,5 20 30 0 0 0 0
Density, g/cm3 2,2 2,2 2,3 2,5 2,7 2,1 1,9 2,1 2,6 3,4 2,5 3,7
Bending strength (not glazed), MPa 50 40 90 140 140 60 30 30 120 250 280 300
Bending strength (glazed), MPa 60 – 110 160 – – – – – – – –
Modulus of elasticity, GPa 60 – 70 100 110 – – – 100 220 280 300
Coefficient of linear thermal expansion at 30-600°С, 10-6К-1 4-7 4-7 4-7 5-7 7-9 2-4 2-4 4-6 5-7 6-8 6-8 7-8
Thermal conductivity at 20-100°С, W/(m·K) 1-2,5 1-2,5 1,2-2,6 1,5-4 2-3 1,2-2,5 1,3-1,8 1,4-2 2-6 14-24 16-28 19-30
Resistance to thermal shock, °С 150 150 150 150 100 250 300 350 150 140 140 150
Maximum operating temperature, °С – – – – 1200 1200 1200 1200 1200 1400 1400 1400
Electrical strength, КV/mm 20 20 20 20 20 10 – – 17 15 15 17
Dielectric loss angle tangent at 20°С, 48-60 Hz, 10-3 25 – 25 30 1,5 25 – – – 0,5 0,5 0,2
Dielectric permeability at 48-62 Hz 6-7 – 6-7 6-7,5 6 5 – – 8 9 9 9

 

Please feel free to contact our specialists on any related issue.