US4437890A
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Method of the preparation of high density sintered alloys based on iron and copper
Assignee: Resonac Corp
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Filing: 1983-03-21
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Granted: 1984-03-20
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Expires: 2003-03-21
Abstract
Abstract A method of the preparation of an improved high-density sintered alloy composed mainly or iron and up to 50 wt. % of copper, in which boron is added in an amount of no less than 0.03% to suppress or limit the copper growth phenomenon during sintering. The alloys prepared by the present method undergo less dimensional changes during sintering and are thus of a very high density as compared with the conventional alloys of the same type.
Inventors
- 👤 Tadao Hayasaka
- 👤 Masahiro Suzuki
- 👤 Shigeru Ozawa
- 👤 Yoshiaki Takeya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:57
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/02; C22C33/0257; C22C33/0278
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
72 words
Method of preparing a high density iron and copper based sintered alloy from alloy material composed mainly of iron and by weight up to 50% copper, 0-0.5% carbon, 0-3% nickel, and 0-1.5% molybdenum in which boron is added to the alloy material in an amount of no less than 0.03% and sufficient to suppress or limit the copper growth phenomenon of the copper present during sintering, and then sintering the alloy material.
Claim 2
Dependent Claim
72 words
Method of preparing a high density iron and copper based sintered alloy from alloy material composed mainly of iron and by weight up to 50% copper, 0-0.5% carbon, 0-3% nickel, and 0-1.5% molybdenum in which boron is added to the alloy material in an amount of no less than 0.03% and sufficient to suppress or limit the copper growth phenomenon of the copper present during sintering, and then sintering the alloy material.
Claim 3
Dependent Claim
48 words
Method of claim 1, wherein by weight a copper content of up to 8% is present, and the sintering is carried out in a die under a dimensional change of the alloy material upon sintering of no more than 0.4% calculated relative to the dimension of the die.
Claim 4
Dependent Claim
17 words
Method of claim 1, wherein by weight a boron content of up to about 0.5% is present.
Claim 5
Dependent Claim
17 words
Method of claim 1, wherein by weight a boron content of up to about 0.25% is present.
Claim 6
Dependent Claim
40 words
Method of claim 1, wherein by weight carbon is also present in an amount of up to 0.5% and sufficiently relative to the amount of boron present for suppressing or limiting the copper growth phenomenon conjointly with the boron present.
Claim 7
Dependent Claim
17 words
Method of claim 5, wherein by weight a boron content of up to about 0.25% is present.
Claim 8
Dependent Claim
35 words
Method of claim 5, wherein by weight the boron is present in an amount sufficient to provide a sintered alloy having a surface hardness of no more than 70 according to the Rockwell B scale.
Claim 9
Dependent Claim
75 words
Method of claim 1, for preparing a high density iron and copper base sintered alloy from alloy material composed mainly of iron and by weight up to 50% copper, 0-0.5% carbon, 0-3% nickel, 0-1.5% molybdenum, 0-2% chromium, and 0-0.6% manganese, in which boron is added to the alloy in an amount of 0.03-0.5% and sufficient to suppress or limit the copper growth phenomenon of the copper present during sintering, and then sintering the alloy material.
Claim 10
Dependent Claim
52 words
High density iron and copper based sintered alloy composed mainly of iron and by weight up to 50% copper, 0-0.5% carbon, 0-3% nickel, 0-1.5% molybdenum, and boron in an amount of no less than 0.03% and sufficient to suppress or limit the copper growth phenomenon of the copper presenting during the sintering.
Claim 11
Dependent Claim
52 words
High density iron and copper based sintered alloy composed mainly of iron and by weight up to 50% copper, 0-0.5% carbon, 0-3% nickel, 0-1.5% molybdenum, and boron in an amount of no less than 0.03% and sufficient to suppress or limit the copper growth phenomenon of the copper presenting during the sintering.
Claim 12
Dependent Claim
53 words
Alloy of claim 9, wherein by weight a copper content of up to 8% is present and the alloy constitutes the product of sintering the alloy material in a die under a dimensional change of the alloy material upon sintering of no more than 0.4% calculated relative to the dimension of the die.
Claim 13
Dependent Claim
19 words
Alloy of claim 9, wherein by weight the boron is present in an amount of up to about 0.5%.
Claim 14
Dependent Claim
19 words
Alloy of claim 9, wherein by weight the boron is present in an amount of up to about 0.25%.
Claim 15
Dependent Claim
18 words
Alloy of claim 9, wherein by weight carbon is also present in an amount of up to 0.5%.
Claim 16
Dependent Claim
18 words
Alloy of claim 13, wherein by weight the boron is present in an amount of up to 0.25%.
Claim 17
Dependent Claim
22 words
Alloy of claim 13, wherein the alloy has a surface hardness of no more than 70 according to the Rockwell B scale.
Claim 18
Dependent Claim
22 words
Alloy of claim 9, wherein the alloy has a surface hardness of no more than 70 according to the Rockwell B scale.
Claim 19
Dependent Claim
41 words
High density iron and copper based sintered alloy of claim 10, composed mainly of iron and by weight up to 50% copper, 0-0.5% copper, 0-3% nickel, 0-1.5% molybdenum, 0-2% chromium, 0-0.6% manganese, and 0.03-0.5% boron, with the balance being substantially iron.
Claim 20
Dependent Claim
8 words
Alloy of claim 17, wherein carbon is present.
Claim 21
Dependent Claim
41 words
High density iron and copper based sintered alloy consisting essentially of by weight up to 50% copper, 0-3% nickel, 0-1.5% molybdenum, 0-2% chromium, 0-0.6% manganese, and boron in an amount of no less than 0.03% with the balance being substantially iron.
Claim 22
Dependent Claim
41 words
High density iron and copper based sintered alloy consisting essentially of by weight up to 50% copper, 0-3% nickel, 0-1.5% molybdenum, 0-2% chromium, 0-0.6% manganese, and boron in an amount of no less than 0.03% with the balance being substantially iron.
Claim 23
Dependent Claim
36 words
Alloy of claim 19, wherein by weight at least one of the following is present: 3% or less of nickel, 1.5% or less of molybdenum, 2% of less of chromium, and 0.6% or less of manganese.
Claim 24
Dependent Claim
49 words
High density iron and copper based sintered alloy consisting essentially of by weight up to 50% copper, carbon in an amount of 0.5% or less, 0-3% nickel, 0-1.5% molybdenum, 0-2% chromium, 0-0.6% manganese, and boron in an amount of no less than 0.03%, with the balance being substantially iron.
Claim 25
Dependent Claim
49 words
High density iron and copper based sintered alloy consisting essentially of by weight up to 50% copper, carbon in an amount of 0.5% or less, 0-3% nickel, 0-1.5% molybdenum, 0-2% chromium, 0-0.6% manganese, and boron in an amount of no less than 0.03%, with the balance being substantially iron.
Claim 26
Dependent Claim
36 words
Alloy of claim 21, wherein by weight at least one of the following is present: 3% or less of nickel, 1.5% or less of molybdenum, 2% or less of chromium, and 0.6% or less of manganese.
Claim 27
Dependent Claim
9 words
A bearing formed of the alloy of claim 19.
Claim 28
Dependent Claim
9 words
A bearing formed of the alloy of claim 20.
Claim 29
Dependent Claim
9 words
A bearing formed of the alloy of claim 21.
Claim 30
Dependent Claim
9 words
A bearing formed of the alloy of claim 22.
References Cited (Backward Citations)
CA873269A
Cited
US3971632A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-03-20 | 1987-09-19 | 1988-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-20 | 1991-09-19 | 1992-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-20 | 1995-09-19 | 1996-03-20 | $7700.00 | Window Closed / Lapsed |