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| Zirconia Toughened Alumina |
| Chemical properties
Grade wise weight % |
Physical properties
Grade wise |
| Components |
ZTA-STD |
ZTA-SD |
Nano ZTA |
Item |
UNIT |
ZTA |
Nano ZTA |
| ZrO2(HfO2) |
18.81 |
18.81 |
14 |
Sintered Density |
g/cm3 |
≥ 4.2 |
4.08 |
| Al2O3 |
79.32 |
79.32 |
86 |
Hardness |
HV |
1250-1350 |
1800 |
| Fe2O3 |
47ppm |
47ppm |
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Thermal Conductivity |
w/m.k |
13 |
|
| SiO2 |
262ppm |
262ppm |
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Thermal Expansion Coefficient |
|
9.4x10- 6/k(200℃) |
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| TiO2 |
0.49 |
0.49 |
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Fracture Toughness |
MPam0.5 |
5--6 |
6-7 |
| MgO |
0.29 |
0.29 |
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Particle Size |
μm |
-- |
--- |
| Na2O |
<100ppm |
<100ppm |
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Flexural Strength
(4p Bending strength |
MPa |
450 |
600 |
| Cl- |
463ppm |
463ppm |
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Compressive Strength |
MPa |
2500 |
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| Particle Size |
0.48μm |
0.48μm |
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| Agglomerate size |
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27-113 μm |
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| Bulk Density |
0.43 g/cm3 |
1.10 g/cm3 |
1000 kg/m2 |
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| For Nano ZTA |
For ZTA STD/ZTA |
| 20-300’C 36hr 300-600’C 15 hr |
RT – 600 C 6hr |
| 600-900’C 9hr 900-1000’C 3hr |
600 C- 1000 C 5hr |
| 1000 - 1620’C 17 hr |
1000 C - 1400 C 6hr |
| 1620-1630’C1 hr - 1630’C-4hr |
1400 C (keep) 1hr |
| Recommended pressure- 150-200 Mpa |
1400 C - 1560 ± 20C 3hr |
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1560 ± 20C (keep) 4hr |
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| Why ZTA? Parts and components made out of Zirconia Toughened Alumina (ZTA) are better in strength & toughness over alpha alumina engineered ceramics. The increased strength and toughness in ZTA is attributed to the stress induced transformation toughening mechanism which is created due to addition of optimized amounts of nano crystalline zirconia particles dispersed though-out the alumina ceramic body.The zirconia composition in ZTA is around 20%. When any crack grows through the ceramic, the crystal structure of the zirconia particles in the region of the crack changes from the metastable tetragonal phase to the stable monoclinic phase. The change increases the volume of the particles by about 3-4% and generates compressive stresses in the alumina matrix. Stresses in turn close the crack and act as an energy barrier to further crack growth. The addition of zirconia to the alumina matrix increases fracture toughness by two times and can be improved by as high as four times, while strength is more than doubled. |
| Applications: ZTA components are expensive when compared with alpha alumina but far better component life and performance prove them cost effective solutions for demanding tough application conditions Major Applications include: Due to Excellent mechanical strength, Wear resistance ,High temperature stability ,Corrosion resistance properties ZTA finds applications in Bearing components (balls, rollers and raceways),Bushings ,Die and cutting tool inserts (replacing carbide and metal tool inserts) ,Valve seats , Pump components…… |
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Important notice regarding this information:
The statements and technical information contained in this document are based on our research and research of others. However, this document is not contractual, and nothing in it, constitutes a warranty (expressed or implied) that the goods described are accurate and fit for a particular purpose of the customer. Purchasers are advised to make their own tests to determine the suitability. This specification supersedes any former publication and is subject to change without notice. |
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| Team RGe |
RGe may be contacted at its head quarters:
F-8, PHASE III, RIICO INDUSTRIAL AREA, Beawar 305901. Rajasthan – India.
Tel +91 1462 512340, fax +91 1462 226966, Mobile +91 9414009700
Email: ssr@zirox.co.in, zirox50@gmail.com .
Website: www.zirox.co.in |
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