Digitale Medien
s.l. ; Stafa-Zurich, Switzerland
Materials science forum
Vol. 534-536 (Jan. 2007), p. 1137-1140
ISSN:
1662-9752
Quelle:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Thema:
Maschinenbau
Notizen:
Diamond grits in tools are typically held in a sintered matrix of metal powder (e.g. Co). Thebonding between diamond and the matrix is essentially mechanical. As a result, most diamondgrits are easily knocked out from the tool during cutting. The diamond industry has designedvarious metal coatings (e.g. Ti, Cr, Si) to improve the adherence of diamond grits in the matrix, butthe improvements have been modest (e.g. up to 50% increase of tool life).A revolutionary “Active Braze Coated Diamond” (ABCD) is now being developed. Thecoating of ABCD is much thicker (e.g. 20 microns) than conventional ones (about 1 micron). Themolten braze is wetted and reacted with diamond to form strong chemical bond at the interface sothat the diamond does not become knocked out of tools.ABCD is coated with a nickel alloy that can form metallurgical diffusion bonds readily withthe metal matrix of the tool. In essence, ABCD turns diamond into a metal grain so that thediamond tools can be made by conventional powder metallurgical process without being concernedabout the poor bonding between matrix metal powder and the diamond as before
Materialart:
Digitale Medien
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.534-536.1137.pdf
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