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Thermal properties

When components made of technical ceramic still keep their dimensional stability at high temperatures of application, then this due to the materials excellent thermal characteristics:

  • low expansion coefficient
  • high strength up to high temperature (high melting point)
  • high thermal shock resistance
  • good heat insulation or heat conductivity
  • (heat) dimensional stabilit

Further, more detailed information to this in the Breviary

*value indication not common 2) in German language sometimes called "special steatite"
3)special version up to 2400 °C
Type Designation Mean linear expansion coefficient Heat conductivity Max. temperature for applications
30 - 100°C
[10-6K-1]		 30 - 600°C
[10-6K-1]		 [Wm-1K-1] [°C]
PSZ Partially stabilised
zirconia		 * 9 - 13 1,2 - 3 900 - 15003)
ATI Aluminium titanate * 5,0 1,5 - 3 900 - 1600
AI2O3 Alumina 80 % 5 - 7 6 - 8 10 - 16 1400 - 1500
AI2O3 Alumina 86 % 5,5 - 7,5 6 - 8 14 - 24 1400 - 1500
AI2O3 Alumina 95 % 5 - 7 6 - 8 16 - 28 1400 - 1500
AI2O3 Alumina >99 % 5 - 7 7 - 8 19 - 30 1400 - 1700
SSN Sintered silicon nitride * 2,5 - 3,5 15 - 45 1750
RBSN Reaction bonded silicon nitride * 2,1 - 3 4 - 15 1100
HPSN Hot-pressed silicon nitride * 3,0 - 3,4 15 - 40 1400
AIN Aluminium nitride 2,5 - 4 4,5 - 5 100 - 180 1750
SSIC Sintered silicon carbide * 4 - 4,8 40 - 120 1400 - 1750
SISIC Silicon infiltrated silicon carbide * 4,3 - 4,8 110 - 160 1380
HPSIC Hot-pressed silicon carbide * 3,9 - 4,8 80 - 145 1700
RSIC Recrystallized silicon carbide 4,2 4,8 20 1600
NSIC Nitride bonded silicon carbide 4,2 4,8 14 - 15 1450
Subgroup
as per IEC 672		 Designation Mean linear expansion coefficient Heat conductivity Max. temperature for applications
30 - 100°C
[10-6K-1]		 30 - 600°C
[10-6K-1]		 [Wm-1K-1] [°C]
C 220 Steatite 7 - 9 7 - 9 2 - 3 *
C 221 High-frequency steatite2) 6 - 8 7 - 9 2 - 3 *
C 230 Special steatite porous 8 - 10 8 - 10 1,5 - 2 *
C 410 Cordierite 1 - 3 2 - 4 1,5 - 2,5 *
C 511 Porous cordierite ceramic 3 - 6 4 - 6 1,3 - 1,8 *
C 520 Porous cordierite ceramic 1,5 - 3,5 2 - 4 1,3 - 1,8 *
C 530 Porous cordierite ceramic 3,5 - 5 4 - 6 1,4 - 2 *
C 610 Alumino silicate (50-65% AI2O3) 5 - 6 5 - 7 2 - 6 *
C 620 Alumino silicate (65-80% AI2O3) 5 - 6 5 - 7 6 - 15 *
C 820 Magnesia 8 - 9 11 - 13 6 - 10  *

We recommend to the manufacturer for specific data, because data shown above are average values and there improved values are available. The stated values were determined on specimen as per IEC 60672-2, and cannot be applied to other shapes and dimensions easily.

Further, more detailed information to this in the Breviary

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