Digitale Medien
Palo Alto, Calif.
:
Annual Reviews
Annual Review of Materials Research
31 (2001), S. 1-23
ISSN:
1531-7331
Quelle:
Annual Reviews Electronic Back Volume Collection 1932-2001ff
Thema:
Maschinenbau
Notizen:
Abstract The synthesis of the two currently used superhard materials, diamond and cubic boron nitride, is briefly described with indications of the factors influencing the quality of the crystals obtained. The physics of hardness is discussed and the importance of covalent bonding and fixed atomic positions in the crystal structure, which determine high hardness values, is outlined. The materials investigated to date are described and new potentially superhard materials are presented. No material that is thermodynamically stable under ambient conditions and composed of light (small) atoms will have a hardness greater than that of diamond. Materials with hardness values similar to that of cubic boron nitride (cBN) can be obtained. However, increasing the capabilities of the high-pressure devices could lead to the production of better quality cBN compacts without binders.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1146/annurev.matsci.31.1.1
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