Fully Yttria Stabilized Zirconia, 8YSZ (8% by mole Yttria) ceramics
Fully Yttria Stabilized Zirconia, 8YSZ (8% by mole Yttria) ceramics are used when an application requires a crucible that is exceptionally strong, wear-resistant and chemically inert at extremely elevated temperature. Also is the material that preferred for most biocompatible applications. Fully Yttria Stabilized Zirconia is the material with the higher strength from the materials we offer and exhibits a Flexural strength that is higher than Nitrides and can approach the value of Carbides. This property significantly extends the reliability and lifetime of crucibles made with stabilized Zirconia.
Fully Yttria Stabilized Zirconia (8YSZ) technical ceramics offers some advantages over Alumina. Namely, Fully Yttria Stabilized Zirconia 8YSZ crucibles compared to Alumina crucibles are more refractory and have lower thermal conductivity, have higher quality surface finish, are denser and are even 4 times superior in terms of strength (this property degrades when temperature exhibits 1000 C). However, are considerably more expensive even than purest grades of Alumina and are less thermal shock resistant. The main reason for 8YSZ high cost is that both Zirconia and Yttria raw material are rare compared with Alumina and thus expensive.
It should be noted that Zirconia can be vulnerable to chemisorption in the presence of water molecules, thus YSZ Properties degrade rapidly when exposed to water vapor at 200 – 300 C.
Fully Stabilized Zirconia (8YSZ) t-ceramics Crucibles Key Features:
- 1800 C service temperature
- 96.7% wt. Zirconia, 13.27% wt. Yttria, less than 20ppm Fe2O3
- Excellent chemical resistance to corrosion from acids and bases even at elevated temperatures
- Negligible porosity and exceptionally fine surface finish enhance cleaning, prevents chemical attack and promotes bio-compatibility
- Superior mechanical strength and wear resistance (Strength & toughness degrade with increasing temperature)
- Low thermal conductivity
- Extended life
- Consistent dimensional control
Related Data
| Main component | 99%Al2O3 | S-SiC | ZrO2 | Si3N4 |
Physical
Property | Density | g/cm3 | 3.9 | 3.1 | 6 | 3.2 |
| Water Absorption | % | 0 | 0.1 | 0 | 0.1 |
| Sinter Temperature | °C | 1700 | 2200 | 1500 | 1800 |
Mechanical
Property | Rockwell Hardness | HV | 1700 | 2200 | 1300 | 1400 |
| Bend Strength | kgf/mm2 | 3500 | 4000 | 9000 | 7000 |
| Compression Intensity | Kgf/mm2 | 30000 | 20000 | 20000 | 23000 |
Thermal
Property | Maximum working
temperature | °C | 1500 | 1600 | 1300 | 1400 |
thermal expansion
coefficient
0-1000°C | /°C | 8.0*10-6 | 4.1*10-6(0-500°C) | 9.5*10-6 | 2.0*10-6(0-500°C) |
| 5.2*10-6(500-1000°C) | 4.0*10-6(500-1000°C) |
| Thermal Shock resistance | T(°C) | 200 | 250 | 300 | 400-500 |
| Thermal Conductivity | W/m.k(25°C | 31 | 100 | 3 | 25 |
| 300°C) | 16 | 100 | 3 | 25 |
Electrical
Property | Resisting rate of Volume | ◎.cm | | | | |
| 20°C | >1012 | 106-108 | >1010 | >1011 |
| 100°C | 1012-1013 | – | – | >1011 |
| 300°C | >1012 | – | – | >1011 |
Insulation Breakdown
Intensity | KV/mm | 18 | semiconductor | 9 | 17.7 |
| Dielectric Constant (1 MHz) | (E) | 10 | – | 29 | 7 |
| Dielectric Dissipation | (tg o) | 0.4*10-3 | – | – | – |
Applications.
Analytical applications, metals melting, ceramic powders heat treatment, material acid treatment even at elevated temperature. Zirconia crucibles are ideal for the melting or sintering of precious metals and super-alloys. Other common applications are dental restorations sintering, crystal growing, crucibles for extremely corrosive environments, like plasma etching etc.
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Fully Yttria Stabilized Technical Ceramic Parts 8YSZ Zirconia Crucibles Melting Or Sintering Images
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