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Zirconia Toughened Alumina Ceramics (ZTA). Alumina serves as the framework, while zirconia is embedded like fine threads. The two forces work together to make them unbreakable! Characteristic advantages: It combines strength and toughness, being harder than steel and tougher than rubber! It has excellent wear resistance and can stand the test of time! Corrosion-resistant, chemically stable, and as good as new over time! It has good biocompatibility and is suitable for the medical field.
Core Principle: Phase Transformation Toughening
The outstanding toughness of Zirconia Toughened Alumina Ceramics mainly stems from the stress-induced phase transformation mechanism of zirconia:
Tetragonal zirconia (t-ZrO?)
At room temperature after ZTA sintering, fine zirconia particles dispersed in the alumina matrix usually exist in the metastable tetragonal phase (t-ZrO?) (stabilizers such as Y?O?, MgO, CeO?, etc. need to be added).
Stress-induced phase transformation
When the material is subjected to external forces (such as crack propagation), the high-stress area near the crack tip will trigger the transformation of t-ZrO? to the stable monocline phase (m-ZrO?).
Volume expansion effect
The t?m phase transition is accompanied by approximately 3-5% volume expansion, which exerts compressive stress on the crack tip, hindering the further opening and propagation of the crack.
Energy dissipation
The phase transformation process itself consumes energy, further increasing the resistance to crack propagation.
Application Field
1. Cutting tools: Cutting tools, inserts (for turning cast iron/high-temperature alloys)
2. Wear-resistant components: nozzles, sealing rings, wire drawing dies, grinding balls, liners (mining, chemical industry)
Biomedical: Artificial joint femoral head, dental implant abutment (superior to pure Al?O? biological inertness + high toughness)
4. Electronics industry: Insulators, ceramic substrates (requiring high thermal conductivity + high insulation)
5 Energy and Chemical Industry: Valve parts, pump linings (Corrosion-resistant + wear-resistant)link:https://www.andaindustrial.com/technical-ceramic/zirconia-toughened-aumina/zirconia-toughened-alumina-ceramics.html