Back to results
US 4,303,442 AGranted
Diamond sintered body and the method for producing the same
AssigneeSumitomo Electric Industries, Ltd.
InventorsAkio Hara, Shuji Yazu
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeSumitomo Electric Industries, Ltd.
InventorsAkio Hara, Shuji Yazu
Estimating the term…
The invention relates to a diamond sintered body having a high wear resistance and making it possible to obtain a processed surface of high dimensional precision and beautiful finish as a wear resisting tool blank for use particularly in a wire drawing die, shaving die and the like, as a tool blank for use in a cutting tool for a workpiece consisting of nonferrous metals, plastics, ceramic, etc., and as a cutting tool blank for use in a glass cutter, synthetic building material cutting blade, etc., and method for producing the same, wherein a mixture comprising a diamond powder below 1.mu. and a powder below 1.mu. of one or more than two kinds of carbides, nitrides and borides of IVa, Va and VIa group metals of the periodic table, and further a powder of iron group metals is placed between a plurality of cemented carbide plates and then subjected to hot press sintering at a high temperature and high pressure under which diamond is stable thereby enabling to obtain a diamond sintered body having high properties suitable for the aforesaid uses.
A diamond sintered body comprising 50-95 vol % of diamond below 1.mu., the remainder being a bonding material comprising carbides, nitrides and borides of IVa, Va or VIa group metals of the periodic table, solid solutions or mixture crystals thereof below 1.mu., and iron group metals.
A method for producing a diamond sintered body characterized in that a mixture of a diamond powder below 1.mu. and a powder below 1.mu. of one or more than two kinds of carbides, nitrides and borides of IVa, Va or VIa group metals of the periodic table and the solid solutions thereof, and a mixture in which a powder of iron group metals is further added, or a mixture of alloy powders of the said compounds and the iron group metals preliminarily alloyed are produced, said mixture being interposed between a plurality of cemented carbide plates directly or with the interposition of partition members for precluding the displacement of a liquid phase in the course of sintering, the diamond containing mixture being sintered by hot pressing it under the condition of high temperature and high pressure in which diamond is stable, thereafter reducing temperature and removing pressure thus taking out sintered body, subsequently part or whole of the cemented carbide plates being removed substantially in parallel.
Dependencies are inferred from the claim text.