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Diamant
Because of its extreme hardness, diamond is especially suitable for processing the following materials:
| All types of carbides |
| Cermet |
| Oxide and non-oxide ceramics |
| PCD / PCB |
| Metal spraying alloys |
| Sapphire / glass |
| Ferrite |
| Graphite |
| Fibre-reinforced plastics |
| Gems and semi-precious stones |
Steel has a high affinity for carbon. Because diamond consists of pure carbon, it is unsuitable for processing steels. The high
temperatures generated by the grinding process cause the steel to strip carbon atoms from the diamond. This degrades the diamond
grinding particles.
Cubic boron nitride
CBN is composed of the elements boron and nitrogen. CBN contains no carbon atoms which, unlike diamond, enables it to be used
for processing steels. The following materials can be processed using CBN with excellent results:
| Hardened steels from about 54 HRc upwards |
| High-speed steel (HSS) |
| Stellite |
| Nickel-based superalloys |
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| ADVANTAGES OF CBN OVER DIAMOND |
| CBN enjoys a significant
advantage over diamond in terms of its thermal stability. Whereas diamond suffers massive loss of hardness at about 700°C,
the hardness of CBN remains almost unaltered even above 1000°C. |
| THERMAL BEHAVIOUR |
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