Cemented carbide for a drill, and for a drill forming holes in p

Details Cemented carbide for a drill, and for a drill forming holes in p Cemented carbide for a drill, and for a drill forming holes in p

1997-06-20

2000-02-22

Turner, Archene

Stock material or miscellaneous articles

Self-sustaining carbon mass or layer with impregnant or...

428323, 428325, 428697, 428698, 428699, B32B 900

Patent

active

060278080

ABSTRACT:
The present invention has as its objective the provision of a cemented carbide (for a drill) which has excellent breakage resistance and which displays good adhesion when coated with a hard-carbon coating; as well as the provision of a drill for forming holes in printed circuit boards which is made using said cemented carbide. It is a WC-iron group metal cemented carbide having as its main component WC having an average grain size of 0.7 .mu.m or less; containing 0.1 to 3.0 weight percent of one or more types selected from the group consisting of V, Cr, Ta and Mo; whose surface layer consists of substantially only WC or only WC grains and components other than binder phase comprising iron group metals; wherein the average grain size of the WC in the surface layer is larger than the average grain size of the WC in the interior; and wherein the Young's Modulus at the interior is 600 MPa or higher.

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