Zirconias

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> Guide To Zirconia

Zirconia materials are among the strongest ceramic materials STC offers. Each stabilized zirconia provides unique and specific properties that meet the demands of extreme applications found in many industries. Offering very high strength, high toughness, wear/abrasion resistance, as well as corrosion resistance, they perform in operating environments that plastics, metals and other ceramic materials cannot withstand. Typical applications include structural components, bushings, pistons, sleeves, rollers, guides, insulators, and more.

  • MSZ – magnesia stabilized; for high-temperature applications; it is not vulnerable to phase transformations at elevated temperatures; heterogeneous microstructure to protect against grain boundary sliding; transformation toughened; high fracture toughness
  • YTZP – yttria stabilized; fine-grained microstructure predominantly tetragonal phase; extremely high strength and toughness; use temperatures below 500°C; transformation toughened to resist crack propagation; superior chemical resistance; excellent wear resistance
  • CSZ – ceria stabilized high temperature, as well as high or low pH environments; transformation toughened; maintains strength in steam and pressure conditions; ceria fills crystal structure vacancies to prevent low temperature degradation
  • ZTA – zirconia toughened alumina; provides 20-30% greater strength than alumina at a lower cost than stabilized zirconias. Transformation toughened; Higher toughness, hardness and wear resistance than alumina
 

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Prime Features
Performs Well In Corrosive Environments 
Typical Applications
Structural ceramic partsAerospace
MedicalBearings
Analytical instrumentation 
Materials Property Chart
 Zirconias
 PropertyASTM MethodUnitsMSZ (Magnesia Stabilized)YTZP 2000 (Yttria Stabilized)YTZP 4000 (Yttria Stabilized)CSZ (Ceria Stabilized)
GeneralCrystal Size (Average)Thin SectionMicrons30113
Color----Ivory or YellowIvoryIvoryYellow
Gas Permeability--atms-cc/secgas tight <10-10gas tight <10-10gas tight <10-10gas tight <10-10
Water AbsorptionC 20-97%0000
MechanicalDensityC 20-97g/cc5.726.026.076.20
HardnessVickers 500gmGPa (kg/mm2)11.7 (1200)12.5 (1250)12.5 (1250)11.7 (1200)
Hardness--R45N78808078
Fracture ToughnessNotched BeamMPam1/212101012
Flexural Strength (MOR)
(3 point) @ RT
F417-87MPa (psi x 103620 (90)951 (138)1380 (200)551 (80)
Tensile Strength @ RT--MPa (psi x 103)310 (45)550 (80)690 (100)337 (49)
Compressive Strength @ RT--MPa (psi x 103)1862 (270)2485 (360)2485 (360)2000 (290)
Elastic ModulusC848GPa (psi x 106)206 (29.8)210 (30)210 (30)200 (29)
Poisson's RatioC848--0.280.300.30.25
ThermalC.T.E. 25 - 100° CC 372-96x 10-6/C8.96.96.96.9
C.T.E. 25 - 300° CC 372-96x 10-6/C9.78.18.18.1
C.T.E. 25 - 600° CC 372-96x 10-6/C1010.510.510.5
Thermal Conductivity @ RTC 408W/m K32.22.23.5
Max Use Temp--Farenheit (°F)22009329321000
--Celsius (°C)1200500500537
ElectricalDielectric Strength (.125" Thick)D 149-97AV/mil300240240250
Dielectric Constant @ 1 MHzD 150-98--22.730.030.030.0
Dielectric ConstantD 2520-95--29.2------
@ GigahertzD 2520-95--6.2------
Dielectric Loss @ 1 MHzD 150-98--0.00160.00100.00100.0010
Dielectric LossD 2520-95--0.0018------
@ GigahertzD 2520-95--6.2------
Volume Resistivity, 25°CD 257ohms-cm> 1 x 1013> 1 x 1013> 1 x 1013> 1 x 1013
Volume Resistivity, 300°CD 1829ohms-cm5 x 1071 x 10101 x 10101 x 1010
Volume Resistivity, 500°CD 1829ohms-cm1 x 1071 x 1061 x 1061 x 106
Volume Resistivity, 700°CD 1829ohms-cm2 x 1065 x 1035 x 1035 x 103
Note: The information in this data sheet is for design guidance only. STC does not warrant this data as absolute values. Forming methods and specific geometry could affect properties. Slight adjustments can be made to some of the properties to accommodate specific customer requirements. Most of the dense materials in the table are resistant to mechanical erosion and chemical attack. STC has performed ASTM testing qualification for certain compositions, in accordance with ASTM D2442. Please consult our technical staff for appropriate material and specific test results.