EP 0822265 A2 19980204 - 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
- EP 95107670 A 19950518
- JP 10558494 A 19940519
- JP 4929095 A 19950215
Abstract (en)
A nitrogen-containing sintered hard alloy includes a hard phase containing WC serving as an essential element and a carbide, nitride or a carbo-nitride of at least one transition metal being selected from the groups 4,A 5A and 6A of the periodic table or a composite carbo-nitride thereof and a binder phase containing Ni, Co and unavoidable impurities, an exudation layer containing a metal binder phase, mainly composed of Ni and Co, and WC being present on an alloy of this part, wherein the exudation layer is internally divided into a three layers in order of an outermost layer and an intermediate layer and an lowermost layer, wherein the outermost layer containing at least 0 percent by volume and not more than 30 percent by volume of WC with a rest being formed by a metal binder phase, the intermediate layer contains at least 50 percent by volume and not more than 100 percent by volume of WC with a rest being formed by a metal binder phase, the lower layer containing at least 0 percent by volume and not more than 30 percent by volume of WC with a rest being formed by a metal binder phase, wherein the outermost and lowermost layers being at least 0.1 mu m and not more than 10 mu m in thickness, the intermediate layer being at least 0.5 mu m and not more than 10 mu m in thickness. 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)
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