Magnesia Stabilized Zirconia (MSZ)

Why does MSZ have a better high temperature strength than YTZP?

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Transformation toughened zirconias such a Magnesia-Stabilized Zirconia have small precipitates of tetragonal phase which are formed inside of the cubic phase grains. These precipitates transform from the meta-stable tetragonal phase to the stable monoclinic phase when a crack attempts to propagate through the material. This causes the precipitate to expand and blunt the crack tip promoting toughness.

MSZ can be either ivory or yellow-orange in color due to differences in preparation of the raw material.

Ivory colored MSZ has a higher purity and offers slightly better mechanical properties.

MSZ is more stable in high temperature (220C and above), high moisture environments than YTZP - where YTZP typically degrades. MSZ has a low thermal conductivity and CTE similar to cast iron to prevent thermal mismatch in ceramic to metal assemblies. Due to the transformation toughening, STC’s partially stabilized MSZ provides excellent strength, toughness, wear, abrasion, and corrosion resistant materials to meet the severe service needs of many industries.

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Prime Features
High mechanical strengthHigh temperature resistance
Very high wear resistanceVery high impact resistance
Very low thermal conductivityThermal expansion suitable for ceramic-to-metal assemblies
High chemical resistance (acids/bases) 


Typical Applications
Deep well, down hole componentsWear parts
Structural ceramicsPrecision valve seats and seals
Roller guides for tube formingMWD tools
BushingsWear sleeves
Pump pistonsPump sleeves
Spray nozzlesCeramic bearings

Materials Property Chart
 PropertyASTM MethodUnitsMagnesia Stabilized Zirconia (MSZ)
GeneralCrystal Size (Average)Thin SectionMicrons30
Color----Ivory or Yellow
Gas Permeability--atms-cc/secgas tight <10-10
Water AbsorptionC 20-97%0
MechanicalDensityC 20-97g/cc5.72
HardnessVickers 500gmGPa (kg/mm2)11.7 (1200)
Fracture ToughnessNotched BeamMPam1/212
Flexural Strength (MOR)
(3 point) @ RT
F417-87MPa (psi x 103620 (90)
Tensile Strength @ RT--MPa (psi x 103)310 (45)
Compressive Strength @ RT--MPa (psi x 103)1862 (270)
Elastic ModulusC848GPa (psi x 106)206 (29.8)
Poisson's RatioC848--0.28
ThermalC.T.E. 25 - 100° CC 372-96x 10-6/C8.9
C.T.E. 25 - 300° CC 372-96x 10-6/C9.7
C.T.E. 25 - 600° CC 372-96x 10-6/C10
Thermal Conductivity @ RTC 408W/m K3
Max Use Temp--Fahrenheit (°F)2200
--Celsius (°C)1200
ElectricalDielectric Strength (.125" Thick)D 149-97AV/mil300
Dielectric Constant @ 1 MHzD 150-98--22.7
Dielectric ConstantD 150-98--29.2
@ GigahertzD 150-98--6.2
Dielectric Loss @ 1 MHzD 150-98--0.0016
Dielectric LossD 150-98--0.0018
@ GigahertzD 150-98--6.2
Volume Resistivity, 25°CD 257ohms-cm> 1 x 1013
Volume Resistivity, 300°CD 1829ohms-cm5 x 107
Volume Resistivity, 500°CD 1829ohms-cm1 x 107
Volume Resistivity, 700°CD 1829ohms-cm2 x 106
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.