Requirements on performance of modern insulating ceramics

The performance of modern insulating ceramics should meet the following requirements:

1. The dielectric constant that can meet the technical requirements;

2. The lowest possible dielectric loss;

3. High volume resistivity and electrical strength;

4. Good dielectric temperature and frequency characteristics;

5. Excellent thermal conductivity, mechanical strength, fracture toughness, chemical stability and thermal stability.

Typical properties of alumina insulating ceramics:

Density (g/cm3): 3.6~3.8 (alumina 95)

Tensile strength (MPa): 300

Thermal expansion coefficient (X10^(-6)/°C): 6.5~8.0

Thermal Conductivity (W/m.K): 17

Volume resistivity (Ω.cm): 10^14 Min.

Dielectric constant (at 1MHz): 8.6

Dielectric loss (at 1MHz):/

Insulation strength (kV/mm): 35

Typical properties of steatite insulating ceramics:

Density (g/cm3): 2.8~3.1
Tensile strength (MPa): 140~300
Thermal expansion coefficient (X10^(-6)/°C): 7~7.5
Thermal conductivity (W/m.K):/
Volume resistivity (Ω.cm): 10^12 ~10^14
Dielectric constant (at 1MHz): 6~7
Dielectric loss (at 1MHz): (3-20) X 10^(-4)
Insulation strength (kV/mm): 20~30

advanced ceramics, technical ceramics,industrial ceramics,ceramic materials,ceramic parts, ceramic components, Lithaiwa

 

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