1.Description
The ceramic eyelet(ceramic ring) is the most commonly used component for the wire passing, and it is used in the wire passing position of the coil winding machine and the textile machinery. Normally it is used for less demanding occasions. The shape, finish and the hardness of materials must be improved in order to reduce the friction because of the wire sliding in the surface of the ceramic rings. According to the requirements, the Polish degree of porcelain eye can be regarded as roughness polishing, precision polishing and ultra-precision polishing.
2.Features & Advantages
1. High hardness.
2. High heat resistance : Alumina ceramic has execellent themal stability,which means that it is widely used in areas where resistance to high temperatures is essential.
3. Good wear resistance : Alumina ceramic is the material of choice for alumina wear parts.
4. High electrical resistivity : Alumina is an electrically insulating material.
5. High corrosion resistance : It is insoluble in water and only slightly soluble in strong acid and alkaline solutions. Good chemical stability of alumina leads to high corrosion resistance
| Item | Testing condition | Unit | 95% al2o3 | 99% al2o3 | 99% al2o3 | 99.5% al2o3 | zirconia |
| Bulk density | | g/cm3 | >3.60 | 3.7 | 3.7 | 3.7 | 6 |
| Flexural Strength | | N/m2×103 | 2.24 | >2.24 | >2.24 | >2.74 | 11 |
| Coefficient of linear expansion | 20~800°C | ×10-6/°C | 6.5~8.0 | 6.5~8.0 | 6.5~8.0 | 6.5~8.0 | 9.5 |
| Permittivity | 1MHz | | 9~10 | 9~10.5 | 9~10.5 | 9~10.5 | / |
| 10GHz | | 9~10 | 9~10.5 | 9~10.5 | / | / |
| Insertion loss | 1MHz | ×10-6 | ≤4 | ≤2.5 | ≤2.5 | ≤1.5 | / |
| 10GHz | ×10-6 | ≤10 | ≤6 | ≤6 | / | / |
| Bulk density resistance | 100°C | Ω·Cm | >1013 | >1013 | >1013 | >1014 | >1012 |
| Puncture strength | | KV/mm | 15 | 15 | 15 | / | / |
| Thermal conductivity | 20°C | W/m·k | 25.2 | 25.2 | 25.2 | 29.2 | 3 |
3.Application:
1) Knitting Machine
2) Winder Guides for PA thread
3) Twisting Machinery
4) Sensible fiber at low speed
5) Sensible fiber at high speed
6) Weaving machinery
7) Texturing machinery
