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Metallurgically Bonded Diamond Metal Composites

IP.com Disclosure Number: IPCOM000082796D
Original Publication Date: 1975-Feb-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Roshon, DD: AUTHOR [+2]

Abstract

Diamond-metal composites have wide application as wear-resistant surfaces and as abrasive cutting tools. The composite consists of diamond particles distributed through a matrix of metal.

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Metallurgically Bonded Diamond Metal Composites

Diamond-metal composites have wide application as wear-resistant surfaces and as abrasive cutting tools. The composite consists of diamond particles distributed through a matrix of metal.

Production of a metallurgical bond between diamond and a metal implies that the metal, in the molten state, will wet diamond. A further factor to be considered is the diamond-graphite transition, which occurs at elevated temperatures. This transition is slow at temperatures below about 900 Degrees C, although this temperature may be exceeded somewhat for short times.

is known that titanium metal wets graphite crucibles, hence titanium can be incorporated in alloys to serve as a wetting agent. One such alloy is a copper- titanium eutectic, containing 72 weight per cent copper. The melting temperature of this alloy is about 880 Degrees C. Excellent wetting of the diamond particles is obtained. The hardness of the Cu-Ti matrix is high, providing resistance to erosion. The alloy is brittle, however.

A second alloy system comprises nickel-titanium, containing 30 to 35% titanium by weight. Melting temperature ranges from 942 to 984 Degrees C. This is somewhat higher than desirable, but can be successfully employed if the time at this temperature is kept short. Wetting is very good. The matrix alloy is hard and has considerable ductility.

It is also possible to employ an existing alloy with suitable physical properties and induce wetting...