Diamond sintered compact having high electrical conductivity...

Compositions – Electrically conductive or emissive compositions – Elemental carbon containing

Reexamination Certificate

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C423S446000

Reexamination Certificate

active

08043533

ABSTRACT:
The present invention is to provide a diamond sintered compact having good conductivity together with the characteristics, such as hardness, thermal conductivity, thermal resistance, chemical stability, almost equal to those of a natural diamond. A boron-doped diamond sintered compact having good conductivity and high thermal resistance is produced by a sintering process, in which 90 to 99.9 wt. % of a boron-doped diamond powder and 0.1 to 10% wt. % of a powder comprising, one or more of carbonates including Mg, Ca, Sr or Ba, and/or one or more of composite carbonates composed by two or more of these elements, as a bonding phase component, are sintered together under Ht/HP conditions, and the bonding phase component melts and then fills into the space between the boron-doped diamond powder particles.

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European Search Report mailed Mar. 3, 2011 for the corresponding European patent application No. 07830622.2.

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