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Synthesis of Fine‐Grained Polycrystalline Diamond Compact and Its Microstructure
Author(s) -
Akaishi Minoru,
Ohsawa Toshikazu,
Yamaoka Shinobu
Publication year - 1991
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1991.tb07288.x
Subject(s) - diamond , materials science , sintering , crystallite , microstructure , boron nitride , material properties of diamond , polycrystalline diamond , vickers hardness test , metallurgy , chemical vapor deposition , economies of agglomeration , grain size , composite material , chemical engineering , nanotechnology , engineering
Sintering of a fine‐grained polycrystalline diamond compact with grains less than 1 μm in size was successfully carried out by making a laminate on a WC/Co powder compact under sintering conditions of 5.8 GPa and 1430° to 1480°C for 30 min, in which small amounts of poly(ethylene glycol) and fine powder of cubic boron nitride were added to the starting diamond powder. The former played the role of preventing agglomeration of the diamond powder and the latter of suppressing abnormal grain growth during sintering. Microstructural observation of the polycrystalline diamond showed that in the regions near the WC/Co layer a comparatively large amount of Co metal was present between diamond grains, but in other regions the amount of Co decreased, and the diamond grains were seen to be bonded strongly. The Vickers hardness of the polycrystalline diamond was 55 ± 5 GPa with 19.6 N load.