EP 0687744 A3 19960821 - Nitrogen-containing sintered hard alloy
Title (en)
Nitrogen-containing sintered hard alloy
Title (de)
Stickstoffenthaltende hartgesinterte Legierung
Title (fr)
Alliage dur fritté contenant de l'azote
Publication
Application
Priority
- JP 10558494 A 19940519
- JP 4929095 A 19950215
Abstract (en)
[origin: EP0687744A2] A nitrogen-containing sintered hard alloy includes at least 75 percent by weight and not more than 95 percent by weight of a hard phase containing Ti, a group 6A metal and WC in a prescribed composition, and at least 5 percent by weight and not more than 25 percent by weight of a binder phase containing Ni, Co and unavoidable impurities, and contains at least 5 percent by weight and not more than 60 percent by weight of Ti in terms of a carbide or the like, and at least 30 percent by weight and not more than 70 percent by weight of a metal belonging to the group 6A of the periodic table in terms of a carbide, while the atomic ratio of nitrogen/(carbon + nitrogen) in the hard phase is at least 0.2 and less than 0.5, and the nitrogen-containing sintered hard alloy is provided with a soft layer containing a binder phase metal and WC in its outermost surface, and has a layer which is hardly provided with the hard phase containing WC in a portion immediately under the soft layer in a thickness of at least 3 mu m and not more than 30 mu m. According to this composition, it is possible to provide a nitrogen-containing sintered hard alloy which can be employed as a cutting tool having high reliability with no surface coating also in working under conditions bringing a strong thermal shock. <IMAGE>
IPC 1-7
IPC 8 full level
B22F 7/02 (2006.01); C22C 1/05 (2006.01); C22C 29/02 (2006.01); C22C 29/04 (2006.01)
CPC (source: EP KR)
B22F 3/101 (2013.01 - EP); B22F 3/1028 (2013.01 - EP); B22F 7/02 (2013.01 - EP); C22C 1/051 (2013.01 - EP); C22C 29/02 (2013.01 - EP); C22C 29/04 (2013.01 - EP); C22C 29/08 (2013.01 - KR); B22F 2201/02 (2013.01 - EP); B22F 2201/20 (2013.01 - EP); B22F 2998/00 (2013.01 - EP)
C-Set (source: EP)
Citation (search report)
- [PX] EP 0603143 A2 19940622 - SANDVIK AB [SE]
- [X] EP 0246211 A2 19871119 - SANTRADE LTD [CH]
- [XA] US 4277283 A 19810707 - TOBIOKA MASAAKI, et al
- [XA] US 4830930 A 19890516 - TANIGUCHI YASURO [JP], et al
- [AD] EP 0499223 A1 19920819 - TOSHIBA TUNGALOY CO LTD [JP]
- [A] US 5106674 A 19920421 - OKADA YOSHIKAZU [JP], et al
- [PX] EP 0635580 A1 19950125 - SUMITOMO ELECTRIC INDUSTRIES [JP]
- [A] EP 0515340 A2 19921125 - SANDVIK AB [SE]
- [A] EP 0368336 A2 19900516 - MITSUBISHI METAL CORP [JP]
- [A] US 4778521 A 19881018 - IYORI YUSUKE [JP], et al
- [A] US 4548786 A 19851022 - YOHE WARREN C [US]
- [A] US 4610931 A 19860909 - NEMETH BELA J [US], et al
- [X] SUZUKI H., HAYASHI K, AND TANIGUCHI Y.: "The beta-free layer formed near the surface of vacuum-sintered WC-beta-Co alloys containing nitrogen", TRANSACTIONS OF THE JAPAN INSTITUTE OF METALS, vol. 22, no. 11, 1981, pages 758 - 764, XP002004622
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
EP 0687744 A2 19951220; EP 0687744 A3 19960821; EP 0687744 B1 19991103; DE 69513086 D1 19991209; DE 69513086 T2 20000713; DE 69523342 D1 20011122; DE 69523342 T2 20020627; EP 0822265 A2 19980204; EP 0822265 A3 19980415; EP 0822265 B1 20011017; KR 0180522 B1 19990218; KR 950032671 A 19951222
DOCDB simple family (application)
EP 95107670 A 19950518; DE 69513086 T 19950518; DE 69523342 T 19950518; EP 97115279 A 19950518; KR 19950012885 A 19950519