Stephen Joseph Bennett

US Patent:

57131333, Feb 3, 1998

Filed:

Jun 27, 1996

Appl. No.:

8/670171

Inventors:

Deepak G. Bhat - Troy MI
Darrell Johnson - Rochester Hills MI
Stephen L. Bennett - Rochester Hills MI

Assignee:

Valenite Inc. - Madison Heights MI

International Classification:

B26B 900

US Classification:

30350

Abstract:

Methods for producing an adherent diamond film on a cemented metal carbide substrate are disclosed. Particularly, the present invention discloses methods of preparing the surface of a cemented metal carbide surface such that an adherent polycrystalline diamond coating may be deposited thereon using CVD techniques. Cutting tool inserts produced from such adherent diamond film coated cemented metal carbide articles are also disclosed.

US Patent:

55608396, Oct 1, 1996

Filed:

Jun 27, 1994

Appl. No.:

8/266087

Inventors:

Stephen L. Bennett - Rochester Hills MI
Deepak G. Bhat - Troy MI
Darrell Johnson - Rochester Hills MI

Assignee:

Valenite Inc. - Madison Heights MI

International Classification:

C23C 1600
B05D 300

US Classification:

216100

Abstract:

Methods for producing an adherent diamond film on a cemented metal carbide substrate are disclosed. Particularly, the present invention discloses methods of preparing the surface of a cemented metal carbide surface such that an adherent polycrystalline diamond coating may be deposited thereon using CVD techniques. Cutting tool inserts produced from such adherent diamond film coated cemented metal carbide articles are also disclosed.

US Patent:

54946352, Feb 27, 1996

Filed:

May 20, 1993

Appl. No.:

8/064686

Inventors:

Stephen L. Bennett - Rochester Hills MI

Assignee:

Valenite Inc. - Madison Heights MI

International Classification:

B22F 310
B22F 700

US Classification:

419 14

Abstract:

Processes are disclosed in which cemented carbide parts, having a wide range of initial carbon levels, and a wide range of sizes, can be carburized to a critical carbon level, and then slow cooled at various rates, to yield stratified enriched zones in the near-surface region of said parts. The enriched zones are characterized by the cobalt content decreasing, and the microhardness increasing, continuously through the enriched zones, and approaching values characteristic of the interior. The combination of stratified enriched zones in the near surface region and the 6% binder interior provide the toughness and deformation resistance required for heavy roughing applications. A wide variety of cemented carbides, having different compositions and WC grain sizes, can also be carburized and slow cooled using the same techniques to yield stratified binder enriched zones having the same hardness profiles and cobalt content profiles as described above.