Precise Alumina Ceramics

Ceramics

Crytur produces complex 3D alumina ceramic shapes. Products are fabricated with a high degree of accuracy for use in instrument manufacture. These ceramics are especially suitable for high vacuum or for metal coatings. High-performance ceramics are invariably used in situations where other materials, such as plastic or metal, cannot withstand the extremely high loads. Precision alumina ceramics are typically produced in quantities of 1-100 pieces. Delivery times range from 4 – 8 weeks depending on quantity or shape complexity. Our ceramics fabrication includes surface grinding, ID and OD grinding and CNC grinding and polishing.

Dimension possibilities of complex 3D shape
Maximum OD 100 mm
MInimal OD 1,2 x 2 mm
Standard tolerances +/- 0,25 %
Maximum tolerances +/- 0,010 mm

 

 

Overview of Applications

There are many applications for high performance ceramics thanks to the specific characteristics or qualities that each ceramic material possesses. Ceramics parts are best suitable especially in equipments operating at high vacuum conditions.

  • HIGH VACUUM INSULATING GROMMETS
  • ELECTRON MICROSCOPY
  • LASER TECHNOLOGY
  • SEMICONDUCTOR COMPONENTS
  • AEROSPACE COMPONENTS
  • AUTOMOTIVE SENSORS
  • ELECTRICAL OR ELECTRONIC INSULATORS
  • BEARINGS TO ANALYTICAL INSTRUMENTATION

Properties 

Basic properties
Composition 98% Al2O3
Porosity Fully gas tight
Density 3850 kg/m3
Color White

Thermal properties of ceramics
Thermal conductivity 29 W/(m * K)
Coeficient of thermal expansion (300 - 900K) 8 * 10-6 /K
Specific heat kapacity 880 J/(kg * K)
Maximum service temperature 1650 °C

 

Fracture toughness tests of ceramics
Fracture toughness 4.3 MPa*m1/2
Flexural strenght 386 MPa
Modulus of elasticity 331 GPa
Compressive strength 2070 MPa
Vickers pyramids number 1340 HV

 

Electrical properties of ceramics
Dielectrict strength 9.3 kV / mm
Dielectrict constant (1MHz) 9.4
Specific resistance (20 °C) 1016   [ohm] * m-1