Technical Ceramics
Alumina Ceramics
Alumina is a technical ceramic known for its high hardness, wear resistance and electrical insulation. It is used on machine parts exposed to friction and in electrical insulation applications.
Properties of alumina
- High hardness
- High wear resistance
- Electrical insulation
- Resistance to many chemical environments
E-500 is made from alumina of 99.7% purity. Its fine-grained structure suits precise surface finishing. On textile lines running at high speed and yarn tension, surface roughness matters as much as the choice of material.
Titania Ceramics
Our titania ceramics address the differing needs of surfaces that touch the yarn. E-TB, being conductive, helps carry static charge away. E-TY is preferred for its surface properties in filament yarn and texturing applications.
Properties of titania
- Surface properties suited to yarn guides
- Electrical conductivity in E-TB
- A surface suited to filament yarn applications in E-TY
Zirconia Ceramics
Zirconia stands out for its high flexural strength and fracture toughness. It is used on parts that need resistance to mechanical loads as well as wear resistance.
Properties of zirconia
- High flexural strength
- High fracture toughness
- High wear resistance
- High hardness
Surface polishing options
- Standard Polish
- Matt Polish
- Diamond Polish
Material data table
| Material code | E-100 | E-200 | E-300 | E-400 | E-500 | E-TY | E-TB | E-Z | |
|---|---|---|---|---|---|---|---|---|---|
| Material type | Al₂O₃ 95% | Al₂O₃ 97% | Al₂O₃ 96%* | Al₂O₃ 98% | Al₂O₃ 99.7% | Titania | Titania | Zirconia | |
| Density | g/cm³ | 3,72 | 3,8 | 3,85 | 3,9 | 3,978 | 4,1 | 4,1 | 6 |
| Water absorption | % | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Vickers hardness (HV, 500 g) | GPa (Vickers, 0,5 kgf) | 14,6 | 16,1 | 18,5 | 18 | 19 | 8,7 | 8,7 | 12,5 |
| Uniaxial compressive strength | MPa | 2800 | 3100 | 3100 | 3400 | 3900 | 800 | 800 | 3000 |
| Flexural strength | MPa | 325 | 385 | 390 | 410 | 550 | 180 | 180 | 900 |
| Modulus of elasticity (E) | GPa 20°C | 330 | 351 | 370 | 380 | 407 | (-) | (-) | 200 |
| Fracture toughness | MPa·m½ | 4 | 4,5 | 4,8 | 5 | 5,9 | (-) | (-) | 10 |
| Thermal conductivity | W/mK 20°C | 20 | 22 | 23 | 25 | 30,4 | 10 | 10 | 2,9 |
| Coefficient of thermal expansion | 10⁻⁶/°C | 7,5 | 8,1 | 8,1 | 8,3 | 8,9 | 8,4 | 8,4 | 9,4 |
| Thermal shock resistance | Δ°C | 170 | 170 | 185 | 200 | 210 | (-) | (-) | 270 |
| Dielectric constant | 1 MHz | 9,3 | 9,3 | 9,5 | 9,8 | 10,1 | (-) | (-) | (-) |
| Electrical resistivity | ohm·cm 20°C | >10¹⁴ | >10¹⁵ | >10¹⁵ | >10¹⁶ | >10¹⁶ | >10¹⁰ | >10² | >10¹¹ |
| Color | Red-white | Red-white | Pink | White | White | Yellow | Black | Cream |
Properties of technical ceramics
- Hardness and wear resistance
- Electrical insulation
- Surface roughness
- Chemical resistance