| Original document(14 pages) 中文版 |
A coated carbide tap (10) comprises a substrate (16) consisting of tungsten carbide cemented with 12 to 16% by weight cobalt with additions of small amounts of transition metal carbides added to restrain grain growth, and may also contain low levels of impurities that might be picked up during processing. The substrate (16) is coated with a layer of metal nitrides, carbides, carbonitrides, borides and/or oxides, the metal being chosen from one or more of the following: aluminum, silicon and the transition metals from Groups IVa, Va, and VIa of the Periodic Chart. The coating may comprise a monolayer (56) and/or alternating layers optionally with varying chemical composition. To reduce friction, a top outer layer (56) comprised of molybdenum disulphide; molybdenum disulphide and transition metals, or any combination thereof; carbon; carbon and transition metal carbides, or any combination thereof; and/or carbon nitride may be either co-deposited as a single layer or deposited in multiple or alternating layers to the coating. The coated carbide tap (10) of the invention can be used at cutting speeds at least three times faster than conventional taps without chipping or breaking the tap. |
Application Number
申请号 |
200480005364 |
Application Date
申请日 |
2004.02.18 |
| Title 名称 |
Coated carbide tap
|
Publication Number
公开号 |
1829599 |
Publication Date
公开日 |
2006.09.06 |
| Approval Pub. Date |
|
Granted Pub. Date |
|
| International Classification 分类号 |
B32B15/04,B32B9/00,B32B19/00,B32B9/04,B23B51/00,B23D77/00,B27G15/00,C22C29/00,C22C5/00,B22F9/00 |
Applicant(s) Name
申请人 |
Kennametal Inc. |
| Address 地址 |
|
| Inventor(s) Name 发明人 |
Henderer Willard E., Santhanam Anakkavur T. |
| Attorney & Agent 代理人 |
cai shengwei |
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