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.
|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 assemblies|
|High chemical resistance (acids/bases)|
|Deep well, down hole components||Wear parts|
|Structural ceramics||Precision valve seats and seals|
|Roller guides for tube forming||MWD tools|
|Pump pistons||Pump sleeves|
|Spray nozzles||Ceramic bearings|