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US4246027A
Expired / Lapsed
US
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High-density sintered bodies with high mechanical strengths
Assignee: National Institute of Advanced Industrial Science and Technology
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Filing: 1979-03-23
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Granted: 1981-01-20
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Expires: 1999-03-23
Abstract
Abstract A novel sintered body suitable for use as a refractory or abrasive material is proposed with high mechanical strengths and hardness even at elevated temperatures. The sintered body of the invention is prepared by subjecting a powder mixture composed of titanium diboride as the base component, a nickel phosphide or nickel-phosphorus alloy and a third component selected from metals of chromium, molybdenum, niobium, tantalum, hafnium, rhenium and aluminum as well as diborides thereof, and the inventive sintered bodies are very advantageous in their industrial production owing to the relatively low sintering temperature of 2000 DEG C. or lower and in their high performance at elevated temperatures to find wide applications in the fields of high-temperature engineering and as a material for the high-speed cutting tools.
Inventors
- 👤 Tadahiko Watanabe
- 👤 Katsushige Nakazono
- 👤 Yunosuke Tokuhiro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:19
CPC Classifications
C; C22; C22C; C22C32/00; C22C32/0047; C22C32/0073; C22C29/00; C22C29/14
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
100 words
A sintered body of a powdery mixture composed essentially of (a) 100 parts by weight of titanium diboride, (b) from 0.5 to 15 parts by weight of an alloy of nickel and phosphorus containing from 3 to 25% by weight of phosphorus based on nickel, and (c) from 1 to 95 parts by weight of at least one metal selected from the group consisting of chromium, molybdenum, niobium, tantalum, hafnium, rhenium and aluminum or at least one metal diboride selected from the group consisting of chromium diboride, molybdenum diboride, niobium diboride, tantalum diboride, hafnium diboride, rhenium diboride and aluminum diboride.
Claim 2
Dependent Claim
100 words
A sintered body of a powdery mixture composed essentially of (a) 100 parts by weight of titanium diboride, (b) from 0.5 to 15 parts by weight of an alloy of nickel and phosphorus containing from 3 to 25% by weight of phosphorus based on nickel, and (c) from 1 to 95 parts by weight of at least one metal selected from the group consisting of chromium, molybdenum, niobium, tantalum, hafnium, rhenium and aluminum or at least one metal diboride selected from the group consisting of chromium diboride, molybdenum diboride, niobium diboride, tantalum diboride, hafnium diboride, rhenium diboride and aluminum diboride.
Claim 3
Dependent Claim
38 words
The sintered body as claimed in claim 1 wherein the amount of the metal as the component (c) is in the range from 1 to 10 parts by weight per 100 parts by weight of the component (a).
Claim 4
Dependent Claim
39 words
The sintered body as claimed in claim 1 wherein the amount of the metal diboride as the component (c) is in the range from 3 to 95 parts by weight per 100 parts by weight of the component (a).
Claim 5
Dependent Claim
28 words
The sintered body as claimed in claim 1 wherein the metal as the component (c) is selected from the group consisting of chromium, molybdenum, niobium, tantalum and rhenium.
Claim 6
Dependent Claim
32 words
The sintered body as claimed in claim 1 wherein the metal diboride as the component (c) is selected from the group consisting of chromium diboride, tantalum diboride, hafnium diboride and aluminum diboride.
Claim 7
Independent Claim
143 words
A method for the preparation of a sintered body which comprises (i) intimately admixing (a) 100 parts by weight of titanium diboride, (b) from 0.5 to 15 parts by weight of an alloy of nickel and phosphorus containing from 3 to 25% by weight of phosphorus based on nickel, and (c) from 1 to 95 parts by weight of at least one metal selected from the group consisting of chromium, molybdenum, niobium, tantalum, hafnium, rhenium and aluminum or at least one metal diboride selected from the group consisting of chromium diboride, molybdenum diboride, niobium diboride, tantalum diboride, hafnium diboride, rhenium diboride and aluminum diboride into a powdery mixture, (ii) molding the powdery mixture into a shaped body, and (iii) subjecting the shaped body to sintering by heating at a temperature in the range from 1500° to 2000° C. for 10 to 60 minutes.
Claim 8
Independent Claim
143 words
A method for the preparation of a sintered body which comprises (i) intimately admixing (a) 100 parts by weight of titanium diboride, (b) from 0.5 to 15 parts by weight of an alloy of nickel and phosphorus containing from 3 to 25% by weight of phosphorus based on nickel, and (c) from 1 to 95 parts by weight of at least one metal selected from the group consisting of chromium, molybdenum, niobium, tantalum, hafnium, rhenium and aluminum or at least one metal diboride selected from the group consisting of chromium diboride, molybdenum diboride, niobium diboride, tantalum diboride, hafnium diboride, rhenium diboride and aluminum diboride into a powdery mixture, (ii) molding the powdery mixture into a shaped body, and (iii) subjecting the shaped body to sintering by heating at a temperature in the range from 1500° to 2000° C. for 10 to 60 minutes.
Claim 9
Dependent Claim
35 words
The method as claimed in claim 6 wherein the steps (ii) and (iii) are conducted simultaneously under compression of the powdery mixture with a pressure in the range from 50 to 300 kg/cm 2 .
Claim 10
Dependent Claim
15 words
The method as claimed in claim 6 wherein the step (iii) is conducted in vacuum.
Claim 11
Dependent Claim
20 words
The method as claimed in claim 6 wherein the step (iii) is conducted in an atmosphere of a reducing gas.
Claim 12
Dependent Claim
13 words
The method as claimed in claim 9 wherein the reducing gas is hydrogen.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-01-20 | 1984-07-21 | 1985-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-20 | 1988-07-21 | 1989-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-20 | 1992-07-21 | 1993-01-20 | $7700.00 | Window Closed / Lapsed |