US5854434A
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US
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High-modulus iron-based alloy with a dispersed boride
Assignee: Toyota Central R&D Labs Inc
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Filing: 1997-01-21
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Granted: 1998-12-29
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Expires: 2017-01-21
Abstract
Abstract A high-modulus iron-based alloy containing at least one boride dispersed in an iron or iron-alloy matrix. The boride may be one of a Group IVa element, or a complex boride of at least one Group Va element and iron. A mixture of an iron or iron-alloy powder and a powder of at least one boride containing a Group IVa or Va element is compacted and sintered to make a shaped high-modulus iron-based alloy product.
Inventors
- 👤 Takashi Saito
- 👤 Kouji Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:08
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/02; C22C33/0257; C22C33/0278; C22C33/0292; B; B22; B22F; B22F2998/00; B22F2998/10
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
90 words
An iron-based alloy consisting essentially of: a matrix formed of iron or an iron alloy; and at least one boride selected from the group consisting of borides of Group IVa elements titanium, zirconium or hafnium and complex borides of at least one Group Va element vanadium, niobium or tantalum, and iron, said at least one boride being dispersed in said matrix, and wherein said at least one boride is in the form of fine particles having a diameter of not more than 100 microns, and dispersed uniformly in said matrix.
Claim 2
Dependent Claim
90 words
An iron-based alloy consisting essentially of: a matrix formed of iron or an iron alloy; and at least one boride selected from the group consisting of borides of Group IVa elements titanium, zirconium or hafnium and complex borides of at least one Group Va element vanadium, niobium or tantalum, and iron, said at least one boride being dispersed in said matrix, and wherein said at least one boride is in the form of fine particles having a diameter of not more than 100 microns, and dispersed uniformly in said matrix.
Claim 3
Dependent Claim
25 words
A iron-based alloy as set forth in claim 1, wherein said iron-based alloy has a content of carbon of not more than 0.1% by weight.
Claim 4
Dependent Claim
25 words
An iron-based alloy as set forth in claim 1, wherein the content of said at least one boride is from 5 to 50% by volume.
Claim 5
Dependent Claim
25 words
An iron-based alloy as set forth in claim 3, wherein the content of said at least one boride is from 10 to 40% of volume.
Claim 6
Dependent Claim
22 words
An iron-based alloy as set forth in claim 1, wherein said fine particles have a diameter of not more than 20 microns.
Claim 7
Dependent Claim
39 words
An iron-based alloy as set forth in claim 1, wherein said at least one boride of said borides of Group IVa elements is a diboride represented by chemical formula MB 2 , where M stands for Group IVa elements.
Claim 8
Dependent Claim
23 words
An iron-based alloy as set forth in claim 1, wherein said at least one boride is a boride of the Group IVa elements.
Claim 9
Dependent Claim
28 words
An iron-based alloy as set forth in claims 1, wherein said at least one boride is a complex boride of at least one Group Va element and iron.
Claim 10
Dependent Claim
31 words
An iron-based alloy as set forth in claim 1, wherein said at least one boride is in the form of fine particles having an average diameter of 4 to 100 microns.
Claim 11
Dependent Claim
62 words
An iron-based alloy as set forth in claim 1, wherein said iron-based alloy has a content of carbon of not more than 0.1% by weight, the content of said at least one boride is from 5 to 50% by volume, and said at least one boride is in the form of fine particles having an average diameter of 4 to 100 microns.
Claim 12
Dependent Claim
77 words
A process for manufacturing a high-modulus iron-based alloy according to claim 1, comprising the steps of: mixing iron or iron-alloy powders and powders of at least one boride of Group IVa elements titanium, zirconium or hafnium to prepare mixed powders; compacting said mixed powders into a shaped body; and sintering said shaped body, thereby dispersing particles of said at least one boride of said Group IVa elements in a matrix formed of said iron or iron-alloy powders.
Claim 13
Dependent Claim
15 words
A process as set forth in claim 11, further comprising hot working after said sintering.
Claim 14
Dependent Claim
91 words
A process for manufacturing a high-modulus iron-based alloy according to claim 1, comprising the steps of: mixing iron or iron-alloy powders, ferroboron powders, and ferroalloy powders containing at least one Group IVa element titanium, zirconium or hafnium to prepare mixed powders; compacting said mixed powders into a shaped body; and sintering said shaped body, thereby causing reaction of said ferroboron powders and said ferroalloy powders to form at least one boride of said Group IVa elements and to disperse particles thereof in a matrix formed of said iron or iron-alloy powders.
Claim 15
Dependent Claim
15 words
A process as set forth in claim 13, further comprising hot working after said sintering.
Claim 16
Dependent Claim
68 words
A process for manufacturing a high-modulus iron-based alloy according to claim 1, comprising the steps of: mixing iron or iron-alloy powders and powders of at least one boride of Group Va elements vanadium, niobium or tantalum to prepare mixed powders; compacting said mixed powders into a shaped body; and sintering said shaped body, thereby dispersing particles of at least one complex boride of said iron or iron-alloy powders.
Claim 17
Dependent Claim
15 words
A process as set forth in claim 15, further comprising hot working after said sintering.
Claim 18
Dependent Claim
96 words
A process for manufacturing a high-modulus iron-based alloy according to claim 1, comprising the steps of: mixing iron or iron-alloy powders, ferroboron powders, and ferroalloy powders containing at least one Group Va element vanadium, niobium or tantalum to prepare mixed powders; compacting said mixed powders into a shaped body; and sintering said shaped body, thereby causing reaction of said ferroboron powders and said ferroalloy powders to form at least one complex boride of at least one Group Va element and iron and to disperse particles thereof in a matrix formed of said iron or iron-alloy powders.
Claim 19
Dependent Claim
15 words
A process as set forth in claim 17, further comprising hot working after said sintering.
Claim 20
Dependent Claim
55 words
An iron-based alloy comprising: (a) a matrix comprising iron or an iron alloy; and (b) at least one compound selected from the group consisting of (i) borides of Group IVa elements and (ii) complex borides of at least one Group Va element and iron, wherein said at least one compound is dispersed in said matrix.
Claim 21
Dependent Claim
55 words
An iron-based alloy comprising: (a) a matrix comprising iron or an iron alloy; and (b) at least one compound selected from the group consisting of (i) borides of Group IVa elements and (ii) complex borides of at least one Group Va element and iron, wherein said at least one compound is dispersed in said matrix.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-12-28 | 2002-06-29 | 2002-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-12-28 | 2006-06-29 | 2006-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-12-28 | 2010-06-29 | 2010-12-29 | $7700.00 | Window Closed / Lapsed |