Magnesia Stabilized Zirconia (MSZ)

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

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> MSZ's High Temperature Strength

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 strength High temperature resistance
Very high wear resistance Very high impact resistance
Very low thermal conductivity Thermal expansion suitable for ceramic-to-metal seemblies
High chemical resistance (acids/bases)  
Typical Applications
Deep well, down hole components Wear parts
Structural ceramics Precision valve seats and seals
Roller guides for tube forming MWD tools
Bushings Wear sleeves
Pump pistons Pump sleeves
Spray nozzles Ceramic bearings

Materials Property Chart
  Zirconias
  Property ASTM Method Units Magnesia Stabilized Zirconia (MSZ)
Electrical Dielectric Strength (.125" Thick) D 149-97A V/mil 300
Dielectric Constant @ 1 MHz D 150-98 -- 22.7
Dielectric Constant D 150-98 -- 29.2
@ Gigahertz D 150-98 -- 6.2
Dielectric Loss @ 1 MHz D 150-98 -- 0.0016
Dielectric Loss D 150-98 -- 0.0018
@ Gigahertz D 150-98 -- 6.2
Volume Resistivity, 25°C D 257 ohms-cm > 1 x 1013
Volume Resistivity, 300°C D 1829 ohms-cm 5 x 107
Volume Resistivity, 500°C D 1829 ohms-cm 1 x 107
Volume Resistivity, 700°C D 1829 ohms-cm 2 x 106
Thermal C.T.E. 25 - 100° C C 372-96 x 10-6/C 8.9
C.T.E. 25 - 300° C C 372-96 x 10-6/C 9.7
C.T.E. 25 - 600° C C 372-96 x 10-6/C 10
Thermal Conductivity @ RT C 408 W/m K 3
Max Use Temp -- Farenheit (°F) 2200
-- Celsius (°C) 1200
Mechanical Density C 20-97 g/cc 5.72
Hardness Vickers 500gm GPa (kg/mm2) 11.7 (1200)
Hardness -- R45N 78
Fracture Toughness Notched Beam MPam1/2 12
Flexural Strength (MOR)
(3 point) @ RT
F417-87 MPa (psi x 103 620 (90)
Tensile Strength @ RT -- MPa (psi x 103) 310 (45)
Compressive Strength @ RT -- MPa (psi x 103) 1862 (270)
Elastic Modulus C848 GPa (psi x 106) 206 (29.8)
Poisson's Ratio C848 -- 0.28
General Crystal Size (Average) Thin Section Microns 30
Color -- -- Ivory or Yellow
Gas Permeability -- atms-cc/sec gas tight <10-10
Water Absorption C 20-97 % 0
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.