 |
PM |  | |
Quote | | |
Reply | | |
Full Topic | |
| Joined: | Thu Apr 16th, 2009 |
| Location: | Arctic, Norway |
| Posts: | 5821 |
| Status: |
Offline
|
Here some doc about the key componant of this ball-bearing system:
Zirconium Oxide, ZrO2
Zirconia is an extremely refractory material. It offers chemical and corrosion inertness to temperatures well above the melting point of alumina. The material has low thermal conductivity. It is electrically conductive above 600°C and is used in oxygen sensor cells and as the susceptor (heater) in high temperature induction furnaces. With the attachment of platinum leads, nernst glowers used in spectrometers can be made as a light emitting filament which operates in air.
.Key Properties of Zirconium Oxide
Use temperatures up to 2400°C
High density
Low thermal conductivity (20% that of alumina)
Chemical inertness
Resistance to molten metals
Ionic electrical conduction
Wear resistance
High fracture toughness
High hardness
.
Typical Uses of ZrO2
Precision ball valve balls and seats
High density ball and pebble mill grinding media
Rollers and guides for metal tube forming
Thread and wire guides
Hot metal extrusion dies
Deep well down-hole valves and seats
Powder compacting dies
Marine pump seals and shaft guides
Oxygen sensors
High temperature induction furnace susceptors
Fuel cell membranes
Electric furnace heaters over 2000°C in oxidizing atmospheres
Now we talk about high grade componant who can endure extreme stress
