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Ceramics

Ceramics

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  • Al 2 O3, color white
  • Purety % 99,9
  • Apparent porosity (%) less than 1
  • Density g/cm3 3,95
  • Flexual Strength (MPa) at 20°C 450 at 1000°C 450
  • Compressive Strength (MPa) at 20°C 2700
  • Thermal Conductivity (cal/cm s °C) 0,07
  • Thermal Shock Resistance T(°C) 200
  • Modulus of Elasticity (Gla) 400
  • Thermal expansion (10-6/°C) 8'1
  • Hardness Vickers (kg/mm2) 1900
  • Kic MPaVm 1-3
  • Average Crystal size in microns 1-2
  • At the customer's request we produce highly specific ceramics.

Quality control
A.F.B.M.A.* GRADE TOLERANCES AND TERMINOLOGY.
GRADE TOLERANCE CHART

Tabelle

  • Basic diameter: The size ordered which is the basis to which the basic diameter tolerances apply. The basic diameter is specified by a fraction plus a decimal or a decimal only to the sixth place. (example: 1/4'' + .0002'' or .2502'' - 15/64'' +.0003'' or .234675'').
  • Basic diameter tolerance: The maximum allowable deviation of any ball diameter from the basic diameter, in any shipments to fill orders for that basic diameter.
  • Diameter tolerance per ball: The permissible difference between the largest diameter and the smallest diameter measurable on one ball.
  • Diameter tolerance per unit container: The permissible range of the average diameters of the individuals balls within any one unit container.
  • Grade: The numerical value of the diameter tolerance per ball expressed in a millionth of an inch.
  • Marking Increments: The standard unit steps in a millionth of an inch used to express the specific diameter.
  • Some materials prevent us from obtaining a better result of tolerance than those obtained at level 10. On the other hand, some materials, mainly ceramics, make it possible to obtain dimensions with a level 4 or 5 , RA is then higher than in the above table.