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Custom ceramic components are available through Hi-Tech Seals. Hi-Tech Seals most popular ceramic materials are Zirconia compounds.


Zirconia ceramics benefits:

  • Excellent strength and high facture toughness
  • Surface finish from 2-4 microinch Ra
  • Thermal stability capable of tolerating thermal gradients better than many high temperature materials
  • Wear resistance in corrosive, abrasive and erosive environments

Applications:

  • Bearing & bushings
  • Fluid handling components
  • Pumps
  • Seals
  • Valves
  • Mechanical applications

Properties:

  Property
Units
Test
Compound 1
Compound 2
  Colour
Ivory
Grey
  Density
gm/cc
ASTM-C20
6.05
6.07
  Crystal Size
Microns
Thin-Section
1
1
  Water Absorption
%
ASTM-373
0
0
  Gas Permeability
0
0
  Flexural Strength (MOR), 20oC
--
--
1240 (180)
1720 (250)
  Elastic Modulus, 20oC
GPa (psi x 106)
ASTM-F417
210 (30)
210 (30)
  Poisson's Ratio, 20oC
--
ASTM-C848
0.23
0.23
  Compressive strength
MPa (psi x 103)
ASTM-C773
2500 (363)
2500 (363)
  Hardness
GPa (kg/mm2)
KNOOP 1000 gm
12.7 (1300)
12.7 (1300)
Rockwell 45N
81
81
  Tensile Strength, 25oC
MPa (psi x 103)
ACMA Test #4
--
--
  Fracture Toughness K(lc)
MPa m1/2
Notched Beam
13
13
  Thermal Conductivity, 20oC
Wm degrees K
ASTM-C408
2.2
2.2
  Coefficient of Thermal Expansion, 25-1000oC
1 x 10-6/oC
ASTM-C372
10.3
10.3
  Specific heat, 100oC
J/Kg*K
ASTM-E1269
400
400
  Thermal Shock Resistance, (delta) Tc
oC
350
350
  Maximum Use Temperature
oC
No-Load Cond.
1500
1500
  Dielectric Strength
ac-kV/mm (acV/mil)
ASTM-D116
9.0 (228)
9.0 (228)
  Dielectric Constant, 1MHz
25oC
ASTM-D150
29
29
  Dielectric Loss (tan delta) 1 MHz
25oC
ASTM-D2520
0.001
0.001
  Volume Resistivity                              25oC
ohm-cm
ASTM-D1829
>1013
>1013
                                                         500oC
ohm-cm
ASTM-D1829
2 x 104
2 x104
                                                         1000oC
ohm-cm
ASTM-D1829
>103
<103
  Impingement
0.2
0.2
  Rubbing
0.2
0.2