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US4235630A
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Wear-resistant molybdenum-iron boride alloy and method of making same
Assignee: Caterpillar Inc
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Filing: 1978-09-05
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Granted: 1980-11-25
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Expires: 1998-09-05
Abstract
Abstract A wear-resistant, molybdenum-iron boride alloy (10) has a microstructure of a primary boride phase (12) and a matrix phase (14). The primary boride phase (12) comprises molybdenum alloyed with iron and boron, and the matrix phase (14) comprises one of iron-boron in iron and iron-molybdenum in iron and has a hardness less than that of the primary boride phase (12). The subject alloy finds particular utility in a composite material on a ground-engaging tool such as a cutting edge or ripper tooth, and can also be used for wear-resistant coatings, machine tool inserts, bearings, and the like.
Inventors
- 👤 B. Naga P. Babu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:50
CPC Classifications
C; C22; C22C; C22C32/00; C22C32/0047; C22C32/0073; C22C29/00; C22C29/14
Claims Analysis
Total Claims: 39
Claim 1
Independent Claim
63 words
A wear-resistant, molybdenum-iron boride alloy (10), comprising: a microstructure of a primary boride phase (12) and a matrix phase (14); said primary boride phase (12) comprising molybdenum alloyed with iron and boron; and said matrix phase (14) comprising one of iron-boron in iron and iron-molybdenum in iron, said matrix phase (14) having a hardness less than that of said primary boride phase (12).
Claim 2
Dependent Claim
63 words
A wear-resistant, molybdenum-iron boride alloy (10), comprising: a microstructure of a primary boride phase (12) and a matrix phase (14); said primary boride phase (12) comprising molybdenum alloyed with iron and boron; and said matrix phase (14) comprising one of iron-boron in iron and iron-molybdenum in iron, said matrix phase (14) having a hardness less than that of said primary boride phase (12).
Claim 3
Dependent Claim
26 words
The alloy of claim 1 wherein said primary boride phase (12) is present in a range of about 60 to 95 Vol.% of the total alloy.
Claim 4
Dependent Claim
26 words
The alloy of claim 1 wherein said primary boride phase (12) is present in a range of about 70 to 90 Vol.% of the total alloy.
Claim 5
Dependent Claim
18 words
The alloy of claim 1 including a plurality of residual impurities individually limited to levels below 2 Wt.%.
Claim 6
Dependent Claim
21 words
The alloy of claim 1 wherein molybdenum is in a range of about 50 to 77 Wt.% of the total alloy.
Claim 7
Dependent Claim
21 words
The alloy of claim 1 wherein iron is in a range of about 17 to 38 Wt.% of the total alloy.
Claim 8
Dependent Claim
21 words
The alloy of claim 1 wherein boron is in a range of about 5 to 13 Wt.% of the total alloy.
Claim 9
Dependent Claim
21 words
The alloy of claim 1 wherein molybdenum is in a range of about 55 to 65 Wt.% of the total alloy.
Claim 10
Dependent Claim
21 words
The alloy of claim 1 wherein iron is in a range of about 26 to 34 Wt.% of the total alloy.
Claim 11
Dependent Claim
21 words
The alloy of claim 1 wherein boron is in a range of about 8 to 12 Wt.% of the total alloy.
Claim 12
Dependent Claim
40 words
The alloy of claim 1 wherein molybdenum is in a range of about 50 to 77 Wt.%, iron is in a range of about 17 to 38 Wt.%, and boron is in a range of about 5 to 13 Wt.%.
Claim 13
Dependent Claim
40 words
The alloy of claim 1 wherein molybdenum is in a range of about 55 to 65 Wt.%, iron is in a range of about 26 to 34 Wt.%, and boron is in a range of about 8 to 12 Wt.%.
Claim 14
Dependent Claim
20 words
The alloy of claim 1 wherein said primary boride phase (12) is of the form Mo 2 FeB 2 .
Claim 15
Dependent Claim
23 words
The alloy of claim 1 wherein said alloy has an average Knoop hardness level of above 1550 Kg/mm 2 at 500 gram load.
Claim 16
Dependent Claim
18 words
The alloy of claim 1 wherein said primary boride phase (12) consists essentially of grains of equiaxed shape.
Claim 17
Dependent Claim
14 words
The alloy of claim 1 wherein said matrix phase (14) is iron-boron in iron.
Claim 18
Dependent Claim
17 words
The alloy of claim 1 in particulate form in a matrix and providing a composite wear-resistant material.
Claim 19
Dependent Claim
16 words
The alloy of claim 17 wherein said composite wear-resistant material is on a ground engaging tool.
Claim 20
Dependent Claim
66 words
A wear-resistant, molybdenum-iron boride alloy (10), comprising: molybdenum in a range of about 50 to 77 Wt.%; iron in a range of about 17 to 38 Wt.%; boron in a range of about 5 to 13 Wt.%; and wherein a primary boride phase (12) and a matrix phase (14) are provided, said primary boride phase (12) containing molybdenum and being harder than said matrix phase (14).
Claim 21
Dependent Claim
66 words
A wear-resistant, molybdenum-iron boride alloy (10), comprising: molybdenum in a range of about 50 to 77 Wt.%; iron in a range of about 17 to 38 Wt.%; boron in a range of about 5 to 13 Wt.%; and wherein a primary boride phase (12) and a matrix phase (14) are provided, said primary boride phase (12) containing molybdenum and being harder than said matrix phase (14).
Claim 22
Dependent Claim
23 words
The alloy of claim 19 wherein said primary boride phase (12) consists primarily of molybdenum alloyed with iron and boron in granular shape.
Claim 23
Dependent Claim
26 words
The alloy of claim 19 wherein said primary boride phase (12) is formed in a range of about 70 to 90 Vol.% of the total alloy.
Claim 24
Dependent Claim
25 words
The alloy of claim 19 wherein said primary boride phase (12) has grains (16,18,20) of equiaxed shape of the form Mo 2 FeB 2 .
Claim 25
Dependent Claim
77 words
A wear-resistant, molybdenum-iron boride alloy (10), comprising: molybdenum in a range of about 50 to 77 Wt.%; iron in a range of about 17 to 38 Wt.%; boron in a range of about 5 to 13 Wt.%; chromium in a range of about 0 to 4.9 Wt.%; titanium in a range of about 0 to 4.9 Wt.%; vanadium in a range of about 0 to 4.9 Wt.%; columbium in a range of about 0 to 4.9 Wt.%;
Claim 26
Dependent Claim
77 words
A wear-resistant, molybdenum-iron boride alloy (10), comprising: molybdenum in a range of about 50 to 77 Wt.%; iron in a range of about 17 to 38 Wt.%; boron in a range of about 5 to 13 Wt.%; chromium in a range of about 0 to 4.9 Wt.%; titanium in a range of about 0 to 4.9 Wt.%; vanadium in a range of about 0 to 4.9 Wt.%; columbium in a range of about 0 to 4.9 Wt.%;
Claim 27
Dependent Claim
70 words
zirconium in a range of about 0 to 4.9 Wt.%; hafnium in a range of about 0 to 4.9 Wt.%; tantalum in a range of about 0 to 4.9 Wt.%; tungsten in a range of about 0 to 4.9 Wt.%; and wherein the alloy includes a primary boride phase (12) and a matrix phase (14), said primary boride phase being between about 70 to 90 Vol.% of the total alloy.
Claim 28
Dependent Claim
70 words
zirconium in a range of about 0 to 4.9 Wt.%; hafnium in a range of about 0 to 4.9 Wt.%; tantalum in a range of about 0 to 4.9 Wt.%; tungsten in a range of about 0 to 4.9 Wt.%; and wherein the alloy includes a primary boride phase (12) and a matrix phase (14), said primary boride phase being between about 70 to 90 Vol.% of the total alloy.
Claim 29
Dependent Claim
68 words
A wear-resistant, molybdenum-iron boride alloy (10), comprising: a microstructure containing a primary boride phase (12) and a matrix phase (14); said primary boride phase (12) consisting primarily, but not essentially of molybdenum alloyed with iron and boron and having a microstructure characterized primarily by grains of equiaxed form; and said matrix phase (14) consisting primarily, but not essentially of one of iron-boron in iron and iron-molybdenum in iron.
Claim 30
Dependent Claim
68 words
A wear-resistant, molybdenum-iron boride alloy (10), comprising: a microstructure containing a primary boride phase (12) and a matrix phase (14); said primary boride phase (12) consisting primarily, but not essentially of molybdenum alloyed with iron and boron and having a microstructure characterized primarily by grains of equiaxed form; and said matrix phase (14) consisting primarily, but not essentially of one of iron-boron in iron and iron-molybdenum in iron.
Claim 31
Dependent Claim
58 words
A wear-resistant, molybdenum-iron boride alloy (10), comprising: 70 to 90 Vol.% of a primary boride phase (12) characterized primarily, but not essentially of molybdenum alloyed with iron and boron in equiaxed grain form; and 10 to 30 Vol.% of a matrix phase (14) characterized primarily, but not essentially of one of iron-boron in iron and iron-molybdenum in iron.
Claim 32
Dependent Claim
58 words
A wear-resistant, molybdenum-iron boride alloy (10), comprising: 70 to 90 Vol.% of a primary boride phase (12) characterized primarily, but not essentially of molybdenum alloyed with iron and boron in equiaxed grain form; and 10 to 30 Vol.% of a matrix phase (14) characterized primarily, but not essentially of one of iron-boron in iron and iron-molybdenum in iron.
Claim 33
Independent Claim
109 words
A method of making a wear-resistant, molybdenum-iron boride alloy (10), comprising: (a) mixing a plurality of ferroboron particles and a plurality of molybdenum particles and forming a mix at a preselected ratio by weight; (b) compressing the mix at a preselected pressure level into an article of preselected shape; (c) sintering the article at a temperature sufficient for controlled formation of a liquid phase; (d) holding said temperature for a preselected period of time sufficient to effect a substantially complete reaction and a substantially densified article; and (e) cooling the substantially densified article to provide an alloy (10) having a primary boride phase (12) in a matrix phase (14).
Claim 34
Independent Claim
109 words
A method of making a wear-resistant, molybdenum-iron boride alloy (10), comprising: (a) mixing a plurality of ferroboron particles and a plurality of molybdenum particles and forming a mix at a preselected ratio by weight; (b) compressing the mix at a preselected pressure level into an article of preselected shape; (c) sintering the article at a temperature sufficient for controlled formation of a liquid phase; (d) holding said temperature for a preselected period of time sufficient to effect a substantially complete reaction and a substantially densified article; and (e) cooling the substantially densified article to provide an alloy (10) having a primary boride phase (12) in a matrix phase (14).
Claim 35
Dependent Claim
15 words
The method of claim 26 wherein step (c) includes sintering in a substantially inert atmosphere.
Claim 36
Dependent Claim
15 words
The method of claim 26 wherein step (c) includes sintering under less than atmospheric pressure.
Claim 37
Dependent Claim
17 words
The method of claim 26 wherein the preselected pressure level of step (b) is about 345 MPa.
Claim 38
Dependent Claim
15 words
The method of claim 26 wherein the temperature of step (c) is about 1600° C.
Claim 39
Dependent Claim
17 words
The method of claim 26 wherein the period of time of step (d) is about ten minutes.
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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) | 1983-11-25 | 1984-05-26 | 1984-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-25 | 1988-05-26 | 1988-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-25 | 1992-05-26 | 1992-11-25 | $7700.00 | Window Closed / Lapsed |