Title:
CERMET FOR ROTARY TOOL
Document Type and Number:
Japanese Patent JP3217404
Kind Code:
B2
Abstract:
PURPOSE: To obtain a cermet for rotary tool excellent in wear resistance and thermal shock resistance by specifying a composition consisting of a group IVa cermet powder with specific grain size distribution, a group Va and VIa cermet powder, and an iron group metal powder.
CONSTITUTION: A cermet powder composition for rotary tool which contains 20-55% of powder of the carbides, nitrides, and carbonitrides of the group IVa transition metals, 20-70% of powder of the carbides, nitrides, and carbonitrides of the group Va and VIa transition metals, and 10-25% of iron group metal powder and where the above group IVa powder has a two-group distribution of 30% of a pulverized powder of 0.1-1.0μm average grain size and 70% of a coarse powder of 1.0-3.0μm average grain size is prepared. This powder composition is sintered, by which a cermet having sufficient wear resistance and thermal shock resistance required of rotary tools can be obtained. This cermet consists of, by volume, 70-95% of hard dispersed phase consisting of group IVa, Va, and VIa transition metals, C, and N and 5-30% of binding phase of iron group metals, and further, a state of specific crystalline grain distribution is formed in this cermet.
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Inventors:
Yuu Matsubara
Application Number:
JP28410391A
Publication Date:
October 09, 2001
Filing Date:
October 04, 1991
Export Citation:
Assignee:
Nippon Special Ceramics Co., Ltd.
International Classes:
B22F7/00; C22C29/02; C22C29/04; C22C29/06; C22C29/08; C22C29/10; C22C29/16; (IPC1-7): C22C29/02; B22F7/00; C22C29/16
Domestic Patent References:
| JP2190438A | ||||
| JP222438A | ||||
| JP2298406A |
Attorney, Agent or Firm:
Asamichi Kato
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