What are the classifications of zirconia powder?
2025-12-15
What are the classifications of zirconia powder?
1. Crystal Structure Classification:
* Monoclinic Zirconia (m-ZrO₂): Low-temperature stable phase, no practical engineering applications, but its crystal transformation is the basis for toughening.
* Tetragonal Zirconia (t-ZrO₂): Metastable phase, achieving high toughness and strength in zirconia ceramics through a "phase transformation toughening" effect, forming the basis for most engineering applications.
* Cubic Zirconia (c-ZrO₂): High-temperature stable phase, possessing oxygen ion conductivity, commonly used in oxygen sensors, solid oxide fuel cells, etc.
2. Stabilizer Classification:
* Partially Stabilized Zirconia: The most typical example is 3 mol% yttrium oxide-stabilized tetragonal zirconia. This is the most widely used type, combining high strength and high toughness, used in grinding media, structural components, etc.
* Partially Stabilized Zirconia: The most typical example is 3 mol% yttrium oxide-stabilized tetragonal zirconia. This is the most widely used type, combining high strength and high toughness, used in grinding media, structural components, etc.
* Fully Stabilized Zirconia: Such as cubic zirconia stabilized with more than 8 mol% yttrium oxide, possessing good oxygen ion conductivity, used in functional ceramics.
• Other stabilizing systems: Besides yttrium oxide (Y₂O₃), there are also magnesia (MgO), calcium oxide (CaO), and cerium oxide (CeO₂) stabilizing systems, each with different performance focuses.
Yttrium oxide-stabilized zirconia (YSZ) is the mainstream general-purpose type, with excellent toughness and processability. Cerium oxide-stabilized CSZ has good low-temperature toughness. Magnesium oxide-stabilized MSZ is resistant to high temperatures. Calcium oxide-stabilized CaSZ is low-cost and corrosion-resistant. Others include ZTA, ATZ, and Zr(OH)₄.
3. Particle size classification: Micron-sized (conventional sintering, low cost), submicron-sized (high forming precision), nano-sized (high density/high activity, suitable for precision components).
4. Forming process: Zirconia production processes (such as dry pressing, injection molding, 3D printing) directly determine whether granulated powder, airflow powder, or spherical powder is needed.
5. Application scenario classification: dental grade (high purity, excellent biocompatibility), electronic grade (low impurities, suitable for insulation/thermal conduction), structural component grade (high toughness, impact resistance), coating grade (good dispersibility, wear and corrosion resistance).
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