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Vertebrae, the most advanced cable housing in the world

Mechanical properties of 96%, 99.5% alumina and ZTA.

Mar 30, 2011 by Dr. Leslie Dean Brown

It’s that time of year again, so you can expect to see more frequent Vertebrae updates! Here’s some detailed information about all three materials used in the construction of vertebrae ceramic cable housing, namely: 96%, 99.5% alumina and ZTA. We’ve included both the mechanical and thermal properties in a tabulated format.

96% Alumina Material Properties 

 

  Property Units Test Value
   Density gm/cc ASTM-C20 3.72
   Crystal Size Microns Thin-Section 6
   Flexural Strength (MOR), 20 °C 358 (52)
   Elastic Modulus, 20 °C GPa (psi x 106) ASTM-F417 303 (44)
   Poisson’s Ratio, 20 °C ASTM-C848 0.21
   Compressive Strength MPa(psi x 103) ASTM-C773 2068 (300)
   Hardness GPa(kg/mm2) KNOOP 1000 gm 11.5 (1175)
      Rockwell 45 N 78
   Tensile Strength, 25 °C MPa (psi x 103) ACMA TEST #4 221 (32)
   Fracture Toughness K(Ic) Mpa m1/2 NOTCHED BEAM 4-5
   Thermal Conductivity, 20 °C Wm degrees K ASTM-C408 24.7
   Coefficient of Thermal Expansion 1 x 10-6/degrees C ASTM-C372 8.2
   Specific Heat, 100 °C J/kg*K ASTM-E1269 880
   Thermal Shock Resistance, (delta)Tc degrees C NOTE 3 250
   Maximum Use Temperature degrees C NO-LOAD COND. 1700

99.5% Alumina Material Properties

 

   Property Units Test Value
   Density gm/cc ASTM-C20 3.90
   Crystal Size Microns Thin-Section 6
   Flexural Strength (MOR), 20 °C 379 (55)
   Elastic Modulus, 20 °C GPa (psi x 106) ASTM-F417 370 (54)
   Poisson’s Ratio, 20 °C ASTM-C848 0.22
   Compressive Strength MPa(psi x 103) ASTM-C773 2600 (377)
   Hardness GPa(kg/mm2) KNOOP 1000 gm 14.1 (1440)
      Rockwell 45 N 83
   Tensile Strength, 25 °C MPa (psi x 103) ACMA TEST #4 262 (38)
   Fracture Toughness K(Ic) Mpa m1/2 NOTCHED BEAM 4-5
   Thermal Conductivity, 20 °C Wm degrees K ASTM-C408 30.0
   Coefficient of Thermal Expansion 1 x 10-6/degrees C ASTM-C372 8.2
   Specific Heat, 100 °C J/kg*K ASTM-E1269 880
   Thermal Shock Resistance, (delta)Tc degrees C NOTE 3 200
   Maximum Use Temperature degrees C NO-LOAD COND. 1750

 

ZTA Material Properties 

 

   Property Units Test Value
   Density gm/cc ASTM-C20 4.05
   Crystal Size Microns Thin-Section 2
   Flexural Strength (MOR), 20 °C 450 (65)
   Elastic Modulus, 20 °C GPa (psi x 106) ASTM-F417 360 (52)
   Poisson’s Ratio, 20 °C ASTM-C848 0.23
   Compressive Strength MPa(psi x 103) ASTM-C773 2900 (421)
   Hardness GPa(kg/mm2) KNOOP 1000 gm 14.4 (1475)
      Rockwell 45 N 85
   Tensile Strength, 25 °C MPa (psi x 103) ACMA TEST #4 290 (42)
   Fracture Toughness K(Ic) Mpa m1/2 NOTCHED BEAM 5-6
   Thermal Conductivity, 20 °C Wm degrees K ASTM-C408 27.0
   Coefficient of Thermal Expansion 1 x 10-6/degrees C ASTM-C372 8.3
   Specific Heat, 100 °C J/kg*K ASTM-E1269 885
   Thermal Shock Resistance, (delta)Tc degrees C NOTE 3 300
   Maximum Use Temperature degrees C NO-LOAD COND. 1500

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