Technische Keramik, Aluminiumoxid, Zirkonoxid, Siliziumnitrid, Keramikbearbeitung, Präzisionsteile, Wellen

Aluminium oxide

Data sheet

Property Unit Tempereture A-976 A- 995
Al2O3-Content %   97,6 99,5
Color -   white white
Density g/cc R.T. 3,76 3,86
Flexural resistance MPa R.T. 296 310
Compressive strength  MPa R.T. >1720 >2070
Hardness Rockwell
45N
  75 81
Porosity % Proz.
Wasseraufn.
  Vakuumdicht
0
Vakuumdicht
0
Thermal
Conductivity
W/m °K R.T. 26,8 29,3
Thermal
Expansion-
coefficient
10-6/°C 25°-200°C 6,9 6,9
200°-400°C 7,8 7,8
400°-600°C 8,5 8,3
600°-800°C 8,8 9,0
800°-1000°C 9,0 9,4
Max.
Operating temp.
°C   1650 1725
Dielectric
Resistance
D.C. volts/mil R.T. 1100 800
D.C. kvolts/mm 43,3 31,5
Temperature
coefficient
°C   >1000 >975
Specific
Contact
resistance
ohm-cm 25°C >1014 >1014
300°C 1,0*1012 2,0*1011
600°C 2,3*1010 6,0*108
1000°C 5,0*1018 2,5*106
Dielectricity
constant
    25°C 300°C 500°C 25°C 300°C 500°C
10MHz 9,53 9,91 10,14 9,58 9,92 10,20
1000MHz 9,00 - - 9,30 - -
8500MHz 9,04 9,32 9,54 9,37 9,61 9,82
Dielectrical
Loss factor
(Tan Δ)
    25°C 300°C 500°C 25°C 300°C 500°C
10MHz 4*10-5 1,6*10-4 5,2*10-4 3*10-5 9*10-5 4*10-4
1000MHz 3*10-4 - - 1,4*10-4 - -
8500MHz 4,5*10-4 4*10-4 7,2*10-4 9*10-5 1,4*10-4 2,5*10-4
Loss factor
(K'tan Δ)
    25°C 300°C 500°C 25°C 300°C 500°C
10MHz 3,8*10-3 1,58*10-3 5,27*10-3 2,9*10-3 8,9*10-3 4,08*10-3
1000MHz 2,7*10-3 - - 1,3*10-3 - -
8500MHz 4,07*10-3 3,73*10-3 6,87*10-3 8,4*10-4 1,35*10-4 2,45*10-3

Regarding the property values given in the tables the preliminary remark about DIN 40685 applies analogously, whereby the given values only apply for the test specimens on which they were measured. A transfer to other forms is only permission under certain conditions. The given values are consequently only to be understood as standard values.