Technical Ceramic
Our alumina, titania and zirconia ceramics: typical characteristics, surface polish options and measured material data.
Alumina Ceramics
Alumina is the hardest and most widely used of the ceramic materials. It is applied where a high wear resistance, high corrosion resistance and strength is necessary. Due to its high dielectric properties it is often applied for electronic products.
Typical characteristics of Alumina
- Good flexural strength
- Very high hardness and wear resistance
- Very high corrosion resistance
- High thermal stability
- Excellent dielectric properties
Our E-500 is of 99,7% purity. Its very small grain size results in a fine and fibre friendly surface. In combination with a very good hardness and wear resistance, our E-500 is the ideal material for all applications with high speeds and tensions. E-500 is surface finished from satinated to diamond (mirror) and high precision with narrow tolerances. Ideal for all Chemical Fibre Applications.
Titania Ceramics
E-TB is conductive and thus antistatic. Our titania ceramics E-TY is a product with a fine grain size and softness. Titania is the perfect material, where a fine, tender surface is vital for the application, e.g. certain fibres and texturizing.
Typical characteristics of Titania
- Sufficient wear resistance
- Sufficient hardness and flexural strength
- Good thermal stability
- Antistatic and conductive (only E-TB)
Zirconia Ceramics
Our zirconia ceramics E-Z is applied where mechanical strength and physical stability is required. A high impact resistance, flexural strength and hardness make it ideal for tough and rugged usage. A fine grain size allows for extremely smooth surfaces and sharp edges. Our E-Z is the result of constant research and development. It is the toughest ceramic material on the market today.
Typical characteristics of Zirconia
- High wear resistance
- High hardness
- Excellent flexural strength
- High corrosion resistance
- High thermal stability
The surface applications applied on Alumina, Titania and Zirconia
- 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 Kind | Al₂O₃ 95% | Al₂O₃ 97% | Al₂O₃ 96%* | Al₂O₃ 98% | Al₂O₃ 99.7% | Titania | Titania | Zirconia | |
| Specific Weight | g/cm³ | 3,72 | 3,8 | 3,85 | 3,9 | 3,978 | 4,1 | 4,1 | 6 |
| H₂O Absorption | % | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Vickers Hardness (HV, 500g) | GPa Hv 0.5 kg | 14,6 | 16,1 | 18,5 | 18 | 19 | 8,7 | 8,7 | 12,5 |
| Uniaxial Comp. Strength | MPa | 2800 | 3100 | 3100 | 3400 | 3900 | 800 | 800 | 3000 |
| Flexural Strength | MPa | 325 | 385 | 390 | 410 | 550 | 180 | 180 | 900 |
| Young's Modulus (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 |
| Thermal Expansion Coeff. | 10⁻⁶/°C | 7,5 | 8,1 | 8,1 | 8,3 | 8,9 | 8,4 | 8,4 | 9,4 |
| Thermal Downshock Res. | Δ°C | 170 | 170 | 185 | 200 | 210 | (-) | (-) | 270 |
| Dielectric Constant | 1 MHz | 9,3 | 9,3 | 9,5 | 9,8 | 10,1 | (-) | (-) | (-) |
| Specific Insulation Res. | ohm·cm 20°C | >10¹⁴ | >10¹⁵ | >10¹⁵ | >10¹⁶ | >10¹⁶ | >10¹⁰ | >10² | >10¹¹ |
| Color | Red-white | Red-white | Pink | White | White | Yellow | Black | Cream |
Why technical ceramics?
Maximum wear resistance
In high-speed lines and continuously moving processes, the most critical threat to system efficiency is tribological deformation — wear caused by friction. Our ceramic materials have a characteristically very hard microstructure and exhibit outstanding wear resistance.
- E-500, our highest-performance grade, is produced from alumina of 99.7% purity; its Vickers hardness reaches 19 GPa.
- Thanks to this structural hardness, no groove forms on the contact surface over time; wear remains minimal even at high speeds.
- Compared with metal counterparts, component life increases many times over; downtime and maintenance costs decrease.
Materials engineering matched to process dynamics
In materials science, optimum performance comes from selecting the chemical composition that exactly matches the operating conditions and mechanical requirements of the system. We engineer the alumina, titania and zirconia ceramics in our material range according to line speed, operating environment and the mechanical tension on the yarn.
- Alumina: the backbone of processes with high speed and mechanical tension; it combines very high hardness with high dielectric insulation.
- Titania: conductive E-TB prevents static build-up; fine-grained, soft-surfaced E-TY prevents filament breakage in texturising applications.
- Zirconia: our toughest grade, developed for conditions that demand high fracture toughness, mechanical shock absorption and very high flexural strength.
Precise surface topography and roughness (Ra) control
Precise control of surface topography is the most critical engineering parameter for optimising friction between contacting materials and protecting the yarn from damage. Our fine-particle microstructure yields smooth surfaces with predictable roughness (Ra) values.
- Every part is taken through the polish grade its application requires: standard, matt or diamond (mirror).
- The controlled surface finish balances the abrasive effect on the yarn; the yarn structure is preserved throughout the process.
- Hairiness and filament break rates drop to a minimum.
Thermal, chemical and dimensional stability
In continuous processes, quality is guaranteed by components that hold their dimensional stability under demanding thermal and chemical conditions.
- The sintered microstructure contains no porosity; water absorption is 0%.
- Being oxide-based, the materials have outstanding corrosion resistance; moisture and chemicals do not affect them.
- Low thermal expansion coefficients preserve form and dimensional tolerances even at high temperature.
- This stability keeps machine calibration unchanged and guarantees process repeatability.