Zirconia Toughened alumina(ZTA) fraction
Zirconia toughened alumina (ZTA) fractions are composite ceramic particles made of alumina (Al₂O₃) as a matrix, with a certain amount of zirconium oxide (ZrO₂) added as a toughening phase. Alumina itself has the advantages of high hardness, high strength, high temperature resistance and good chemical stability, but its toughness is relatively low and it is prone to brittle fracture.
Zirconia has a unique phase change toughening mechanism. Adding it to the alumina matrix can significantly improve the toughness and reliability of the material and overcome the brittle disadvantage of alumina.
Zirconia Toughened alumina(ZTA) fraction features:
- Introducing zirconium oxide into the crystal phase of alumina and filling the zirconium oxide crystals into the grain boundaries of alumina through stress is beneficial to reduce the generation of cracks and greatly improve the toughness of alumina.
- High hardness, Rockwell hardness 88-90HRA, microhardness of Vickers HV 1200-1400
- High bulk density. The volume density of ZTA is not less than 4.15g/cm3, and that of ATZ is not less than 5.4g/cm3.
- Excellent wear resistance, especially high temperature wear resistance.
- Low porosity, strong compactness and not easy to break.
- The crystal size is small, about 1-5um.
Chemical composition:
| Item | Standard Value | Typical Value |
| (Zr+Hf)O2 | 19-21% | 19.03% |
| Al2O3 | 78-80% | 79.87% |
| Y2O3 | 0.5-1.5% | 1.06% |
Physical Index:
| Color | White |
| Bulk density（g/cm3） | ≥4.15 |
| Apparent porosity（%） | 0 |
| Crystal size（um） | ＜5 |
| Vickers hardness HV10 | ≥1400 |
| Cold bending strength（MPa） | 450 |
| Cold compressive strength（MPa） | 2500 |
| Fracture toughness KIC(MPa/m2) | ≥5.5 |
| Max service temperature（℃） | 1700℃ |
| Thermal conductivity | 9.0 x 10-6（20-400℃） |
ZTA Particle fraction Size: 1-2mm,1.2-2.5mm,2-3mm,2.5-4mm,4-6mm,etc.
Application of Zirconia Toughened alumina:
- Grinding media: Due to its high hardness, high strength and good wear resistance, ZTA are widely used as grinding media in various grinding and polishing processes. For example, in the grinding production process of electronic materials, ceramics, coatings and other industries. Besides, ZTA grinding balls can grind materials efficiently while reducing the pollution of materials.
- Cutting tools: Cutting tools made of Zirconia toughened alumina have good cutting performance and service life. In metal processing, wood processing and other fields, ZTA tools can achieve high-precision cutting and can withstand high cutting pressure and wear.
- Wear-resistant parts: In the field of mechanical engineering, ZTA can be used to manufacture various wear-resistant parts, such as pump impellers, valve seals, bearings, etc. These parts need to withstand friction and wear during work. Moreover, the excellent performance of ZTA can ensure the long-term stable operation of the parts.
- Biomedical field: ZTA materials have good biocompatibility and can be used to manufacture biomedical products such as artificial joints and dental implants. Its high strength and toughness can meet the mechanical requirements under the physiological environment of the human body and provide patients with reliable treatment options.
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