US4933008A
Expired / Lapsed
US
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Heat resistant and wear resistant iron-based sintered alloy
Assignee: Nissan Motor Co Ltd
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Filing: 1989-02-03
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Granted: 1990-06-12
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Expires: 2009-02-03
Abstract
Abstract A heat resistant and wear resistant iron-based sintered alloy for use as the material of an engine component part which is subjected to severe temperature and wear conditions. The iron-based sintered alloy is comprised of a matrix formed of metal powder having the composition of alloy steel or high speed tool steel. An additional metal component formed of hard alloy powder is dispersed in the matrix in an amount ranging from 3 to 50% by weight of the matrix. The hard alloy powder contains as major components iron, molybdenum and silicon which improve the wetting property of the hard alloy powder with the matrix and form intermetallic compounds which are high in hardness and excellent in heat and oxidation resistances.
Inventors
- 👤 Akira Fujiki
- 👤 Yoshiteru Yasuda
- 👤 Makoto Abe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 00:57
CPC Classifications
F; F02; F02F; F02F7/00; F02F7/0085; C; C22; C22C; C22C33/00; C22C33/02; C22C33/0207; C22C33/0257; C22C33/0278; C22C33/0285; F05; F05C; F05C2201/00; F05C2201/04; F05C2201/0433; F05C2201/0436
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
156 words
A heat resistant and wear resistant iron-based sintered alloy comprising: a matrix formed of metal powder having composition of one selected from the group consisting of alloy steel and high speed tool steel; and an additional metal component dispersed in said matrix and formed of hard alloy powder, said additional metal component being in an amount ranging from 3 to 50% by weight of said matrix, said hard alloy powder consisting essentially of carbon in an amount ranging from 0.02 to 0.2% by weight, silicon in an amount ranging from 3 to 30% by weight, manganese in an amount ranging from 0.05 to 0.7% by weight, molybdenum in an amount ranging from 10 to 60% by weight, titanium in an amount ranging from 1 to 7% by weight, boron in an amount ranging from 0.5 to 2% by weight, nickel in an amount ranging from 1 to 10% by weight, and balance being iron and impurities.
Claim 2
Dependent Claim
156 words
A heat resistant and wear resistant iron-based sintered alloy comprising: a matrix formed of metal powder having composition of one selected from the group consisting of alloy steel and high speed tool steel; and an additional metal component dispersed in said matrix and formed of hard alloy powder, said additional metal component being in an amount ranging from 3 to 50% by weight of said matrix, said hard alloy powder consisting essentially of carbon in an amount ranging from 0.02 to 0.2% by weight, silicon in an amount ranging from 3 to 30% by weight, manganese in an amount ranging from 0.05 to 0.7% by weight, molybdenum in an amount ranging from 10 to 60% by weight, titanium in an amount ranging from 1 to 7% by weight, boron in an amount ranging from 0.5 to 2% by weight, nickel in an amount ranging from 1 to 10% by weight, and balance being iron and impurities.
Claim 3
Dependent Claim
40 words
A heat resistant and wear resistant iron-based sintered alloy as claimed in claim 1, wherein said iron-based sintered alloy is produced by mixing said metal power and said hard alloy powder, compacting the mixed powders, and sintering said compacted powders.
Claim 4
Dependent Claim
39 words
A heat resistant and wear resistant iron-based sintered alloy as claimed in claim 1, wherein said hard alloy powder consists essentially of at least one of niobium, tantalum and tungsten in an amount not more than 20% by weight.
Claim 5
Dependent Claim
38 words
A heat resistant and wear resistant iron-based sintered alloy as claimed in claim 1, wherein said hard alloy powder consists essentially of at least one of chromium and cobalt in an amount not more than 20% by weight.
Claim 6
Dependent Claim
22 words
A heat resistant and wear resistant iron-based sintered alloy as claimed in claim 1, wherein said hard alloy powder has intermetallic compound.
Claim 7
Dependent Claim
36 words
A heat resistant and wear resistant iron-based sintered alloy as claimed in claim 5, wherein said intermetallic compound is at least one selected from the group consisting of FeMoSi, Fe 3 MoSi and MoSi 2 .
Claim 8
Dependent Claim
36 words
A heat resistant and wear resistant iron-based sintered alloy as claimed in claim 1, wherein said metal powder of said matrix has at least one structure of the group consisting of pearlite, sorbite, martensite, and bainite.
Claim 9
Dependent Claim
26 words
A heat resistant and wear resistant iron-based sintered alloy as claimed in claim 1, wherein said hard alloy powder contains at least 2% by weight titanium.
Claim 10
Dependent Claim
27 words
A heat resistant and wear resistant iron-based sintered alloy as claimed in claim 1, wherein said hard alloy powder contains from 2 to 4% by weight titanium.
Claim 11
Dependent Claim
27 words
A heat resistant and wear resistant iron-based sintered alloy as claimed in claim 1, wherein said hard alloy powder contains from 0.1 to 0.15% by weight carbon.
Claim 12
Dependent Claim
27 words
A heat resistant and wear resistant iron-based sintered alloy as claimed in claim 1, wherein said hard alloy powder contains from 5 to 15% by weight silicon.
Claim 13
Dependent Claim
27 words
A heat resistant and wear resistant iron-based sintered alloy as claimed in claim 1, wherein said hard alloy powder contains from 20 to 50% by weight molybdenum.
Claim 14
Dependent Claim
27 words
A heat resistant and wear resistant iron-based sintered alloy as claimed in claim 1, wherein said hard alloy powder contains from 0.8 to 1.5% by weight boron.
Claim 15
Dependent Claim
27 words
A heat resistant and wear resistant iron-based sintered alloy as claimed in claim 1, wherein said hard alloy powder contains from 3 to 7% by weight boron.
Claim 16
Dependent Claim
28 words
A heat resistant and wear resistant iron-based sintered alloy as claimed in claim 1, consisting essentially of said matrix and said additional metal component dispersed in said matrix.
Claim 17
Dependent Claim
182 words
A component part of an internal combustion engine which part is subjected to impact and friction at high temperatures, said component part being formed of a heat resistant and wear resistant iron-based sintered alloy which comprises: a matrix formed of metal powder having composition of one selected from the group consisting of alloy steel and high speed tool steel; and an additional metal component dispersed in said matrix and formed of hard alloy powder, said additional metal component being in an amount ranging from 3 to 50% by weight of said matrix, said hard alloy powder consisting essentially of carbon in an amount ranging from 0.02 to 0.2% by weight, silicon in an amount ranging from 3 to 30% by weight, manganese in an amount ranging from 0.05 to 0.7% by weight, molybdenum in an amount ranging from 10 to 60% by weight, titanium in an amount ranging from 1 to 7% by weight, boron in an amount ranging from 0.5 to 2% by weight, nickel in an amount ranging from 1 to 10% by weight, and balance being iron and impurities.
Claim 18
Dependent Claim
182 words
A component part of an internal combustion engine which part is subjected to impact and friction at high temperatures, said component part being formed of a heat resistant and wear resistant iron-based sintered alloy which comprises: a matrix formed of metal powder having composition of one selected from the group consisting of alloy steel and high speed tool steel; and an additional metal component dispersed in said matrix and formed of hard alloy powder, said additional metal component being in an amount ranging from 3 to 50% by weight of said matrix, said hard alloy powder consisting essentially of carbon in an amount ranging from 0.02 to 0.2% by weight, silicon in an amount ranging from 3 to 30% by weight, manganese in an amount ranging from 0.05 to 0.7% by weight, molybdenum in an amount ranging from 10 to 60% by weight, titanium in an amount ranging from 1 to 7% by weight, boron in an amount ranging from 0.5 to 2% by weight, nickel in an amount ranging from 1 to 10% by weight, and balance being iron and impurities.
Claim 19
Dependent Claim
20 words
A component part as claimed in claim 16, wherein said hard alloy powder contains at least 2% by weight titanium.
Claim 20
Dependent Claim
175 words
A valve seat of an engine valve for an internal combustion engine, said valve seat being formed of a heat resistant and wear resistant iron-based sintered alloy which comprises: a matrix formed of metal powder having composition of one selected from the group consisting of alloy steel and high speed tool steel; and an additional metal component dispersed in said matrix and formed of hard alloy powder, said additional metal component being in an amount ranging from 3 to 50% by weight of said matrix, said hard alloy powder consisting essentially of carbon in an amount ranging from 0.02 to 0.2% by weight, silicon in an amount ranging from 3 to 30% by weight, manganese in an amount ranging from 0.05 to 0.7% by weight, molybdenum in an amount ranging from 10 to 60% by weight, titanium in an amount ranging from 1 to 7% by weight, boron in an amount ranging from 0.5 to 2% by weight, nickel in an amount ranging from 1 to 10% by weight, and balance being iron and impurities.
Claim 21
Dependent Claim
175 words
A valve seat of an engine valve for an internal combustion engine, said valve seat being formed of a heat resistant and wear resistant iron-based sintered alloy which comprises: a matrix formed of metal powder having composition of one selected from the group consisting of alloy steel and high speed tool steel; and an additional metal component dispersed in said matrix and formed of hard alloy powder, said additional metal component being in an amount ranging from 3 to 50% by weight of said matrix, said hard alloy powder consisting essentially of carbon in an amount ranging from 0.02 to 0.2% by weight, silicon in an amount ranging from 3 to 30% by weight, manganese in an amount ranging from 0.05 to 0.7% by weight, molybdenum in an amount ranging from 10 to 60% by weight, titanium in an amount ranging from 1 to 7% by weight, boron in an amount ranging from 0.5 to 2% by weight, nickel in an amount ranging from 1 to 10% by weight, and balance being iron and impurities.
Claim 22
Dependent Claim
20 words
A valve seat as claimed in claim 18, wherein said hard alloy powder contains at least 2% by weight titanium.
References Cited (Backward Citations)
US4093454A
Cited
US4422815A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-06-11 | 1993-12-11 | 1994-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-11 | 1997-12-11 | 1998-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-11 | 2001-12-11 | 2002-06-12 | $7700.00 | Window Closed / Lapsed |