US4636252A
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Method of manufacturing a high toughness cermet for use in cutting tools
Assignee: Mitsubishi Metal Corp
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Filing: 1984-05-14
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Granted: 1987-01-13
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Expires: 2004-05-14
Abstract
Abstract A method of manufacturing a cermet having high toughness and high hardness, which exhibits excellent impact resistance and wear resistance when used in cutting tools. A mixed powder is prepared which consists essentially of: titanium nitride, from 25 to 50 percent by weight; titanium carbide, from 10 to 30 percent by weight; at least one selected from the group consisting of tantalum carbide, niobium carbide, and zirconium carbide, from 5 to 25 percent by weight; tungsten carbide, from 10 to 25 percent by weight; and at least one selected from the group consisting of Co and Ni, and Al if required, from 7.5 to 25 percent by weight in total. The above mixed powder is compressed into a green compact. The green compact is sintered in a nitrogen atmosphere under a pressure within a range from 0.1 to 100 torr, and at a temperature within a range from 1400 DEG to 1550 DEG C. In the resulting cermet, the hard disperse phase has a cored structure which is formed by an NaCl-type solid solution phase having a centered structure with titanium carbide at the center surrounded by a solid solution of at least one selected from the group consisting of tantalum carbide, niobium carbide, and zirconium carbide, tungsten carbide, titanium carbide, and titanium nitride, and by a titanium nitride phase.
Inventors
- 👤 Hironori Yoshimura
- 👤 Jhunichi Toyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:15
CPC Classifications
C; C22; C22C; C22C29/00; C22C29/02; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12049; Y10T428/12056; Y10T428/12181; Y10T428/12493; Y10T428/12535; Y10T428/12542; Y10T428/12549; Y10T428/12576
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
140 words
A method of manufacturing a cermet having high toughness for use in cutting tools, comprising the steps of: (a) preparing a mixed powder consisting essentially of: titanium nitride, from 25 to 50 percent by weight; titanium carbide, from 10 to 30 percent by weight; at least one compound selected from the group consisting of tantalum carbide, niobium carbide, and zirconium carbide, from 5 to 25 percent by weight; tungsten carbide, from 10 to 25 percent by weight; and at least one metal selected from the group consisting of Co and Ni, from 7.5 to 25 percent by weight; (b) compressing said mixed powder into a green compact; and (c) sintering said green compact in a nitrogen atmosphere under a pressure within a range from 0.1 to 100 torr, and at a temperature within a range from 1400° to 1550° C.
Claim 2
Independent Claim
140 words
A method of manufacturing a cermet having high toughness for use in cutting tools, comprising the steps of: (a) preparing a mixed powder consisting essentially of: titanium nitride, from 25 to 50 percent by weight; titanium carbide, from 10 to 30 percent by weight; at least one compound selected from the group consisting of tantalum carbide, niobium carbide, and zirconium carbide, from 5 to 25 percent by weight; tungsten carbide, from 10 to 25 percent by weight; and at least one metal selected from the group consisting of Co and Ni, from 7.5 to 25 percent by weight; (b) compressing said mixed powder into a green compact; and (c) sintering said green compact in a nitrogen atmosphere under a pressure within a range from 0.1 to 100 torr, and at a temperature within a range from 1400° to 1550° C.
Claim 3
Independent Claim
144 words
A method of manufacturing a cermet having high toughness for use in cutting tools, comprising the steps of: (a) preparing a mixed powder consisting essentially of: titanium nitride, from 25 to 50 percent by weight; titanium carbide, from 10 to 30 percent by weight; at least one compound selected from the group consisting of tantalum carbide, niobium carbide, and zirconium carbide, from 5 to 25 percent by weight; tungsten carbide, from 10 to 25 percent by weight; and Al and at least one metal selected from the group consisting of Co and Ni, from 7.5 to 25 percent by weight in total; (b) compressing said mixed powder into a green compact; and (c) sintering said green compact in a nitrogen atmosphere under a pressure within a range from 0.1 to 100 torr, and at a temperature within a range from 1400° to 1550° C.
Claim 4
Independent Claim
144 words
A method of manufacturing a cermet having high toughness for use in cutting tools, comprising the steps of: (a) preparing a mixed powder consisting essentially of: titanium nitride, from 25 to 50 percent by weight; titanium carbide, from 10 to 30 percent by weight; at least one compound selected from the group consisting of tantalum carbide, niobium carbide, and zirconium carbide, from 5 to 25 percent by weight; tungsten carbide, from 10 to 25 percent by weight; and Al and at least one metal selected from the group consisting of Co and Ni, from 7.5 to 25 percent by weight in total; (b) compressing said mixed powder into a green compact; and (c) sintering said green compact in a nitrogen atmosphere under a pressure within a range from 0.1 to 100 torr, and at a temperature within a range from 1400° to 1550° C.
Claim 5
Dependent Claim
25 words
The method as claimed in claim 1 or claim 2, wherein said titanium nitride is in an amount from 30 to 45 percent by weight.
Claim 6
Dependent Claim
26 words
The method as claimed in claim 1 or claim 2, wherein said titanium carbide is in an amount within a range from 15-25 percent by weight.
Claim 7
Dependent Claim
40 words
The method as claimed in claim 1 or claim 2, wherein said at least one compound selected from the group consisting of tantalum carbide, niobium carbide and zirconium carbide is in an amount from 10 to 15 percent by weight.
Claim 8
Dependent Claim
29 words
A method as claimed in claim 1 or claim 2, wherein said tungsten carbide is contained in an amount within a range from 10 to 20 percent by weight.
Claim 9
Dependent Claim
33 words
The method as claimed in claim 1, wherein said at least one metal selected from the group consisting of Co and Ni is in an amount from 12 to 20 percent by weight.
Claim 10
Dependent Claim
49 words
The method as claimed in claim 2, wherein Al and said at least one metal selected from the group consisting of Co and Ni are in a total amount from 12 to 20 percent by weight which includes the Al in an amount of from 0.01 to 1.2 percent.
Claim 11
Dependent Claim
22 words
The method as claimed in claim 1 or claim 2, wherein said pressure of nitrogen atmosphere is from 1 to 10 torr.
Claim 12
Dependent Claim
20 words
The method as claimed in claim 1 or claim 2, wherein said sintering temperature is from 1430° to 1480° C.
Claim 13
Dependent Claim
217 words
A cermet manufactured by the steps of: (a) preparing a mixed powder consisting essentially of: titanium nitride, from 25 to 50 percent by weight; titanium carbide, from 10 to 30 percent by weight; at least one compound selected from the group consisting of tantalum carbide, niobium carbide, and zirconium carbide, from 5 to 25 percent; tungsten carbide, from 10 to 25 percent by weight; and at least one metal selected from the group consisting of Co and Ni, from 7.5 to 25 percent by weight; (b) compressing the above mixed powder into a green compact; and (c) sintering the above green compact in a nitrogen atmosphere under a pressure within a range from 0.1 to 100 torr, and at a temperature within a range from 1400° to 1550° C., said cermet having a hard disperse phase which comprises two phases, namely a first phase having a core/shell structure which is formed of a NaCl-type solid solution phase with titanium carbide at the center surrounded by a solid solution of tungsten carbide, titanium carbide, titanium nitride and at least one compound selected from the group consisting of tantalum carbide, niobium carbide, and zirconium carbide, and a titanium nitride second phase; and a binder phase comprising at least one metal selected from the group consisting of Co and Ni.
Claim 14
Dependent Claim
217 words
A cermet manufactured by the steps of: (a) preparing a mixed powder consisting essentially of: titanium nitride, from 25 to 50 percent by weight; titanium carbide, from 10 to 30 percent by weight; at least one compound selected from the group consisting of tantalum carbide, niobium carbide, and zirconium carbide, from 5 to 25 percent; tungsten carbide, from 10 to 25 percent by weight; and at least one metal selected from the group consisting of Co and Ni, from 7.5 to 25 percent by weight; (b) compressing the above mixed powder into a green compact; and (c) sintering the above green compact in a nitrogen atmosphere under a pressure within a range from 0.1 to 100 torr, and at a temperature within a range from 1400° to 1550° C., said cermet having a hard disperse phase which comprises two phases, namely a first phase having a core/shell structure which is formed of a NaCl-type solid solution phase with titanium carbide at the center surrounded by a solid solution of tungsten carbide, titanium carbide, titanium nitride and at least one compound selected from the group consisting of tantalum carbide, niobium carbide, and zirconium carbide, and a titanium nitride second phase; and a binder phase comprising at least one metal selected from the group consisting of Co and Ni.
Claim 15
Dependent Claim
253 words
A cermet manufactured by the steps of: (a) preparing a mixed powder consisting essentially of: titanium nitride, from 25 to 50 percent by weight; titanium carbide, from 10 to 30 percent by weight; at least one compound selected from the group consisting of tantalum carbide, niobium carbide, and zirconium carbide, from 5 to 25 percent; tungsten carbide, from 10 to 25 percent by weight; and (i) at least one metal selected from the group consisting of Co and Ni, and (ii) Al, in a total amount from 7.5 to 25 percent by weight; (b) compressing the above mixed powder into a green compact; and (c) sintering the above green compact in a nitrogen atmosphere under a pressure within a range from 0.1 to 100 torr, and at a temperature within a range from 1400° to 1550° C., said cermet having a hard disperse phase which comprises two phase, namely a first phase having a core/shell structure which is formed of a NaCl-type solid solution phase with titanium carbide at the center surrounded by a solid solution of tungsten carbide, titanium carbide, titanium nitride and at least one compound selected from the group consisting of tantalum carbide, niobium carbide, and zirconium carbide, and a titanium nitride second phase; and a binder phase comprising at least one metal selected from the group consisting of Co and Ni, in which are dispersively present fine grains of intermetallic compounds of Al and Ti and at least one metal selected from the group consisting of Co and Ni.
Claim 16
Dependent Claim
253 words
A cermet manufactured by the steps of: (a) preparing a mixed powder consisting essentially of: titanium nitride, from 25 to 50 percent by weight; titanium carbide, from 10 to 30 percent by weight; at least one compound selected from the group consisting of tantalum carbide, niobium carbide, and zirconium carbide, from 5 to 25 percent; tungsten carbide, from 10 to 25 percent by weight; and (i) at least one metal selected from the group consisting of Co and Ni, and (ii) Al, in a total amount from 7.5 to 25 percent by weight; (b) compressing the above mixed powder into a green compact; and (c) sintering the above green compact in a nitrogen atmosphere under a pressure within a range from 0.1 to 100 torr, and at a temperature within a range from 1400° to 1550° C., said cermet having a hard disperse phase which comprises two phase, namely a first phase having a core/shell structure which is formed of a NaCl-type solid solution phase with titanium carbide at the center surrounded by a solid solution of tungsten carbide, titanium carbide, titanium nitride and at least one compound selected from the group consisting of tantalum carbide, niobium carbide, and zirconium carbide, and a titanium nitride second phase; and a binder phase comprising at least one metal selected from the group consisting of Co and Ni, in which are dispersively present fine grains of intermetallic compounds of Al and Ti and at least one metal selected from the group consisting of Co and Ni.
Claim 17
Dependent Claim
47 words
The method as claimed in claim 2 wherein, Al and at least one metal selected from the group consisting of Co and Ni is in an amount from 12 to 20 percent by weight which includes the Al in an amount of from 0.01 to 1.0 percent.
Claim 18
Dependent Claim
105 words
The method as claimed in claim 11 wherein, said titanium nitride is in an amount from 30 to 45 percent by weight; said titanium carbide is in an amount from 15 to 25 percent by weight; said at least one compound selected from the group consisting of tantalum carbide, niobium carbide and zirconium carbide is in an amount from 10 to 15 percent by weight; said tungsten carbide is in an amount from 10 to 20 percent by weight; and said at least one metal selected from the group consisting of Co and Ni is in an amount from 12 to 20 percent by weight.
Claim 19
Dependent Claim
149 words
The method as claimed in claim 12 wherein, said titanium nitride is in an amount of 30 to 45 percent by weight; said titanium carbide is in an amount from 15 to 25 percent by weight; said at least one compound selected from the group consisting of tantalum carbide, niobium carbide and zirconium carbide is in an amount from 10 to 15 percent by weight; said tungsten carbide is in an amount from 10 to 20 percent by weight; said at least one metal selected from the group consisting of Co and Ni is in an amount from 12 to 20 percent by weight; and the total of Al and said at least one metal selected from the group consisting of Co and Ni are in a total amount from 12 to 20 percent by weight which includes the Al in an amount of from 0.01 to 1.2 percent.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1990-01-12 | 1990-07-14 | 1991-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-12 | 1994-07-14 | 1995-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-12 | 1998-07-14 | 1999-01-13 | $7700.00 | Window Closed / Lapsed |