yixing haiyu refractory co.,ltd
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alumina ceramics tube precision solid round bar accurate size wear resistant Mechanical and electronic manufacturing
product name:alumina ceramic bar
Introduction of alumina ceramics bar:
Alumina ceramic rod is an oxide ceramic with a-alumina as the main component. It is characterized by good compactness, good wear resistance, excellent insulation performance, low wear rate, acid and alkali corrosion resistance, high hardness, good surface finish, delicate porcelain, high precision, good heat dissipation, chemical performance temperature and so on. The main application fields are machinery manufacturing, electronic manufacturing, chemical industry, textile industry, because of its excellent chemical properties and metal corrosion resistance, and high temperature resistance up to 1700 °C. It can show its excellent insulation at high voltage and various frequencies, and it is also applied to the mechanical transmission environment with corrosion resistance and wear resistance.
Physicochemical indexes of alumina solid rod:
| Item | Unit | Typical Values |
| Physical Properties | ||
| Colour | Ivory | |
| Density | g/cm3 | 3.85 |
| Alumina Content | % | 99% |
| Gas Permeability | 0 | |
| Water Absorption | % | 0% |
| Physical Properties | ||
| MONS’Hardness | 82 | |
| Vickers Hardness(Hv50) | Gpa(kg/mm2) | 15.7(1600) |
| Flexural Strength(20℃) | Mpa | 330 |
| Compressive Strength(20℃) | Mpa | 2000 |
| Fracture Thoughness(20℃) | Mpam1/2 | 4 |
| Thermal Properties | ||
| Thermal Conductivity(20℃) | W/(m.k) | 27.5 |
| Thermal Expansion Coeffcient | 10-6/℃ | 7.6 |
| Thermal Shock Resistance | △T℃ | 200 |
| Maximum Use Temperature | ℃ | 1650 |
| Electrical Properties | ||
| Dielectric Strength | KV/mm | ＞12 |
| Dielectric Conatant | ε0 | 9-10 |
| Dielectric Loss Angle(1MHz) | 0.0002 | |
| Volume Resistivity(20℃) | Ω.cm | ＞1014 |
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