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Mechanical properties

 

 

Technical ceramics offer decisive advantages for application under high mechanical load:

  • outstanding hardness
  • high mechanical strength
  • high dimensional stability
  • resistance to wear.

Mechanical characteristics of ceramic materials

Type Designation Open porosity Density Bending strength E-Module Vickers hardness Critical fracture toughness
max. Vol.% [gcm-3] [Nmm-2] [GPa] [103Nmm-2] KIC [MPawurzelm]
PSZ Partially stabilised
zirconia		 0 5 - 6 500 - 1000 140 - 210 12 - 20 8
AT Aluminium titanate * 3,0-3,7 25 - 40 10 - 30 * 1
SSN Sintered
silicon nitride		 * 3 - 3,3 300 - 700 250- 330 4 - 18 5 - 8,5
RBSN Reaction bonded
silicon nitride		 * 1,9 - 2,5 80 - 330 80 - 180 80 - 10 1,8 - 4,0
HPSN Hot-pressed
silicon nitride		 0 3,2 - 3,4 300 - 600 290 - 320 15 - 16 6,0 - 8,5
AIN Aluminium nitride 0 3,0 200 320 11 3,0
SSIC Sintered silicon
carbide		 0 3,08 - 3,12 300 - 600 370 - 450 25 - 26 3,0 - 4,8
SSC Silicon infiltrated
silicon carbide		 0 3,08 - 3,12 180 - 450 270 - 350 14 - 25 3,0 - 5,0
HPSC Hot-pressed
silicon carbide		 0 3,16 - 3,2 500 - 800 440 - 450 14 - 29 5,3
RSC Recrystallized
Silicon carbide		 0 - 15 2,6 - 2,8 80 - 120 230 - 280 25 3,0
NSC Nitride bonded
silicon carbide		 * 2,82 200 150 - 240 * *
Subgroup as per
IEC 672		 Designation Open porosity Density Bending strength E-module Vickers hardness Critical fracture toughness
max. Vol.% [gcm-3] [Nmm-2] [GPa] [103Nmm-2] KIc [MPawurzelm]
C 110 Siliceous porcelain < 0,5 2,2 20 * * *
C 111 Pressed porcelain 3 2,2 40 * * *
C 120 Aluminous porcelain 0 2,3 90 * * *
C 130 Aluminous porcelain 0 2,5 140 * * *
C 220 Steatite 0 2,6 120 * * *
C 221 High frequency steatite2) 0 2,7 140 * * *
C 230 Special steatite porous 35 1,8 30 * * *
C 310 Titan dioxide 0 3,5 70 * * *
C 410 Cordierite 0,5 2,1 60 * * *
C 511 Porous cordierite ceramics 20 1,9 25 * * *
C 520 Porous cordierite ceramics 20 1,9 30 * * *
C 530 Porous cordierite ceramics 30 2,1 30 * * *
C 610 Alumino silicate (50-65% AI2O3) 2,6 120 * *   *
C 620 Alumino silicate (65-80% AI2O3) 0 2,8 150 * * *
C 780 Alumina ceramics 80% 0 3,2 200 200 12-15 3,5-4,5
C 786 Alumina ceramics 86% 0 3,4 250 220 12-15 4-4,2
C 795 Alumina ceramics 95% 0 3,5 280 220-350 12-20 4-4,2
C 799 Alumina ceramics 99% 0 3,7 300 300-380 17-23 4-5,5
C 820 Magnesia 30 2,5 50 * * *
C 910 Aluminium nitride 0 3,0 200 * * *
*value indication not customary 2) in German language sometimes called "special steatite"
We recommend asking the manufacturer for his own data, because there are often improved values available. The stated values were determined on specimen as per IEC 672-2, and cannot be applied to other forms and dimensions.

 

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10. Mai 2005

info@keramverband.de
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