Specialized metallurgical processes – compositions for use therei – Compositions – Consolidated metal powder compositions
Patent
1996-01-29
1998-01-06
Mai, Ngoclan
Specialized metallurgical processes, compositions for use therei
Compositions
Consolidated metal powder compositions
75242, 419 11, 419 33, 419 48, C22C 2900
Patent
active
057057583
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a diamond sintered compact additionally provided with properties suitable for, in particular, an edge of a cutting tool and a wear resistance tool and more particularly, it is concerned with a nonmagnetic or feebly magnetic diamond sintered compact whose magnetic susceptibility is at most 3% of Fe.
In particular, the diamond sintered compact of the present invention can be applied to a wear resistance tool during transporting a magnetic product or producing a magnetic material utilizing the feature of the feeble magnetism thereof.
BACKGROUNDS TECHNIQUES
A diamond sintered compact, obtained by sintering fine diamond grains with an iron group metal such as Co, as a binder, at an ultra-high pressure and high temperature under which diamond is thermodynamically stable, has widely been used for cutting tools, wear resistance tools, wire-drawing dies, etc. utilizing its excellent strength as well as wear resistance. However, it is difficult at the present time to use, as a wear resistance tool for magnetic products, commercially available diamond compacts, the most part of which are produced by infiltrating Co in a diamond powder from WC--Co cemented carbides at an ultra-high pressure and high temperature, as described in Japanese Patent Publication No. 12126/1977 to give a ferromagnetic material.
A method comprising dissolving a feebly magnetic metal component in a ferromagnetic iron group metal and thereby changing the magnetic moment has been known, as exemplified by a graph showing a change of magnetic moment of Ni shown in FIG. 1 and FIG. 2 from "Handbook of Magnetism (Jisei Binran)". Japanese Patent Publication No. 14107/1986 describes a diamond sintered compact in which iron group metals and carbides, nitrides and borides of Ti, Zr, Hf, V, Nb, Ta and Cr are dissolved in a binder phase of diamond, but this aims at preventing grain growth of diamond and is silent as to the magnetic property.
As the magnetism-free diamond sintered compact, there are marketed a diamond sintered compact from which the binder metal is leached with an acid, as disclosed in U.S. Pat. No. 4224380 and a diamond sintered compact using a ceramic material such as SiC, etc. as a binder, as disclosed in Japanese Laid-Open Publication No. 236650/1986. These diamond sintered compacts do not have magnetism, nor simultaneously allow electric current to pass, so an electric discharge working, commonly used as a working method of diamond, cannot be used but the compacts are applied to only limited uses such as fine wire drawing dies for laser working.
When using the diamond sintered compacts of the prior art as a wear resistance tool of a claw or absorption nozzle for transporting or conveying magnetic products, the products tend to adhere to the tool and is hardly peeled off, or the positioning precision during transporting is deteriorated to result in difficulty in use of the tool. As a wear resistance tool during producing a magnetic material such as a guide for a magnetic tape, they cannot be used because of checking the magnetic property of the products.
The principal object of the present invention is to provide a non-magnetic or feebly magnetic diamond sintered compact capable of solving these problems and being applied to magnetic products or magnetic materials.
DISCLOSURE OF THE INVENTION
The inventors have made various efforts to overcome the disadvantage that the diamond sintered compacts of the prior art have strong magnetism and consequently, have succeeded in decreasing the magnetic moment of an iron group metal in the binder phase by at least 80% while maintaining the bonding strength of diamond grains with each other as it is by dissolving a predetermined amount of another feebly magnetic metal component in the binder phase of the iron group metal, and thereby also decreasing the magnetic moment of the diamond sintered compact itself by at least 80%.
That is to say, the present invention provides a non-magnetic or feebly magnetic diamond sintered compact whose magnetic susceptib
REFERENCES:
patent: 4231762 (1980-11-01), Hara et al.
patent: 4374900 (1983-02-01), Hara et al.
patent: 4636253 (1987-01-01), Nakai et al.
patent: 5304342 (1994-04-01), Hall, Jr. et al.
Wakabayashi Takayoshi
Yamamura Akihiko
Mai Ngoclan
Sumitomo Electric Industries Ltd.
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