Pre-alloyed powder and its use in the manufacture of diamond...

Specialized metallurgical processes – compositions for use therei – Compositions – Loose particulate mixture containing metal particles

Reexamination Certificate

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C075S246000, C419S011000, C419S023000

Reexamination Certificate

active

06387151

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to the use of a pre-alloyed powder containing iron as binder in the manufacture of diamond tools by hot sintering.
BACKGROUND OF THE RELATED ART
In the manufacture of diamond tools by hot sintering, with or without pressure, of an intimate mixture of diamond and of binder, use is made, for the binder, that is to say the material forming the matrix of the tool at the end of the sintering operation, either of fine cobalt powders (1-6 &mgr;m) or of mixtures of fine powders, such as a mixture of fine cobalt, nickel and iron powders, or coarse pre-alloyed powders (less than 44 &mgr;m), such as a steel powder obtained by atomization.
The use of a fine cobalt powder has very good results from a technical standpoint; its only drawback stems from the high price of the powder.
Using mixtures of fine powders, matrices are obtained whose hardness and, consequently, the wear resistance, are relatively low.
The use of coarse pre-alloyed powders requires a sintering temperature of about 1100-1300° C., at which temperature degradation of the diamond, called graphitization, becomes appreciable.


REFERENCES:
patent: 2238351 (1941-04-01), Van Der Pyl
patent: 2410512 (1946-11-01), Lindquist et al.
patent: 4049380 (1977-09-01), Yih et al.
patent: 4231762 (1980-11-01), Hara
patent: 5283031 (1994-02-01), Ogasawara et al.
patent: 5337992 (1978-04-01), None
patent: 1689053 (1991-11-01), None
Chemical Abstracts, vol. 108, No. 22, May 30, 1988, Columbus, Ohio, US; Abstract No. 191222, Tsughiya, Shinjiro et al: “Copper-Iron Alloy Binder in Diamond Tools for Cutting and Polishing of fine Ceramics” XP002011548.
See abstract & JP 62 287 035 A (Fuji Die Co., Ltd., Japan).
Engström et al., “Powders and Processes for High Performance PM Steels”, Powder Metallurgy, vol. 35, No. 1, 1992, pp. 67-72.

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