alumina ceramics tube electronic engineering chemical metallurgy
spin electric power corrosion resistance
product name:alumina ceramic tube
The structure of alumina ceramic material is stable. Al2O3 is the
main raw material of alumina ceramic, and α-Al2O3 is the main
crystal phase, which is the most widely used and the largest output
ceramic material in oxide ceramics. In alumina ceramics, the higher
the alumina content, the better the performance. Alumina ceramics
have the following advantages :
( 1 ) has high mechanical strength and hardness. Its Rockwell
hardness is HRA80-90, second only to diamond, far more than
wear-resistant steel and stainless steel.
( 2 ) Good wear resistance. Its wear resistance is 266 times that
of manganese steel and 171.5 times that of high chromium cast iron.
( 3 ) Good chemical stability, excellent electrical insulation
performance, low high frequency dielectric loss, high temperature
resistance, chemical corrosion resistance, good thermal
conductivity and good biocompatibility.
Because of these excellent comprehensive technical properties,
alumina ceramics have been widely used in electronics, electrical
appliances, machinery, chemical industry, textile, medicine,
automobile, metallurgy, aerospace and other industries. However,
there is little research on alumina ceramics in the direction of
civil use. Alumina ceramics not only have the above excellent
properties, but also have the advantages of high whiteness, high
resistance to falling, small sintering shrinkage ( about 10 %
alumina in the same forming process, while about 18 % daily
porcelain, small product deformation, high yield ), high purity of
raw materials, non-toxic, harmless, health and environmental
protection. Compared with other daily porcelain varieties, it is a
high-quality porcelain variety.
products index:
| Ceramic characteristic table |
| | name | 99% AL2O3 | 95% AL2O3 |
| physical propertyessential component | essential component | AL2O3≥99% | AL2O3≥95% |
| Density(g/cm3) | 3.85 | 3.6 |
| water absorption% | 0 | 0 |
| sintering temperature | 1690 | 1670 |
| material characters | Hardness(HV) | 1700 | 1600 |
| break off strength | >6500 | >2900 |
| compressive strength | 30000 | 25000 |
| thermal response | maximum service tempera- ture | 1500 | 1400 |
| thermal expansion coefficient | 8 | 7.8 |
| 10-6/℃ |
| 0-1000℃ |
| Heat shock resistance T(℃) | 200 | 220 |
| thermal conductivity W/m.k | 31 | 22 |
| electrical specification | volume resistivity Ω.cm | >1012 | >1012 |
| Insulation destructive power KT/m | 18 | 16 |
| dielectric constant 1MHZ(E) | 9.2-10.5 | 9.0-10 |
Company workshop production pictures:
