Polycrystalline diamond partially depleted of catalyzing...

Details Polycrystalline diamond partially depleted of catalyzing... Polycrystalline diamond partially depleted of catalyzing...

2005-03-01

2005-03-01

Turner, Archene (Department: 1775)

Coating processes

With post-treatment of coating or coating material

Chemical agent applied to treat coating

C075S743000, C075S753000, C216S056000, C216S096000, C216S100000, C427S337000

Reexamination Certificate

active

06861098

ABSTRACT:
A method for forming a superhard polycrystalline diamond or diamond-like element with greatly improved resistance to thermal degradation without loss of impact strength. Collectively called PCD elements, these elements are formed with a binder-catalyzing material in a high-temperature, high-pressure process. The PCD element has a plurality of partially bonded diamond or diamond-like crystals forming at least one continuous diamond matrix, and the interstices among the diamond crystals forming at least one continuous interstitial matrix containing a catalyzing material. The element has a working surface and a body, where a portion of the interstitial matrix in the body adjacent to the working surface is substantially free of the catalyzing material to a depth from the working surface, the remaining interstitial matrix contains the catalyzing material, causing a 950 degrees C. temperature at the working surface to be less than 750 degrees C. at the depth.

REFERENCES:
patent: 4224380 (1980-09-01), Bovenkerk et al.
patent: 0 617 207 (1994-03-01), None
patent: WO 0028106 (2000-05-01), None
International Search Report for PCT/GB01/03986, dated Feb. 18, 2002.
International Search Report for PCT/GB01/02638, dated Feb. 18, 2002.

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