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US4966626A
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Sintered ferro alloy having heat and wear resistance and process for making
Assignee: Nissan Motor Co Ltd
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Filing: 1989-06-28
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Granted: 1990-10-30
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Expires: 2009-06-28
Abstract
Abstract A sintered ferro alloy comprises 5 to 25 wt % of one or two elements selected from Mo and W, 2 to 10 wt % of Cr, 0.1 to 0.9 wt % of Si, less than or equal to 0.7 wt % of Mn, less than or equal to 0.05 wt % of P, 0.5 to 2.0 wt % of C, 0.5 to 2.0 wt % of B, 0.1 to 7.0 wt % of at least one element selected from borides of La, Ce, Nd, Sm, Eu, Gd, Yb, Y or Sc, residual Fe, and contaminants. Also the alloy may comprise less than or equal to 20 wt % of at least one element selected from V, Nb, Ta, Ti, Zr, Hf, Co or Ni, if necessary. The alloy is produced by mixing the above mentioned components and pressurizing them in an Fe matrix, then sintering the pressurized mixture at 1150° C. to 1260° C. for 60 min. and reheating after sintering. This alloy has wear and heat resistance and can be utilized as valve seats for internal combustion engines in automotive vehicles.
Inventors
- 👤 Akira Fujiki
- 👤 Yoshiteru Yasuda
- 👤 Hiroyuki Endo
- 👤 Yutaka Ikenoue
- 👤 Keitaro Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:06
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/02; C22C33/0257; C22C33/0278; C22C33/0292; F; F01; F01L; F01L3/00; F01L3/22; F02; F02F; F02F7/00; F02F7/0085
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
96 words
A sintered ferro alloy having heat and wear resistance comprising: 5 to 25 wt % of at least one element selected from the group consisting of Mo and W, 2 to 10 wt % of Cr, 0.1 to 0.9 wt % of Si, less than or equal to 0.7 wt % of Mn, less than or equal to 0.05 wt % of P, 0.5 to 0.2 wt % of C, 0.5 to 0.2 wt % of B, 0.1 to 7.0 wt % of at least one boride of rare earth elements, and residual Fe and contaminants.
Claim 2
Dependent Claim
96 words
A sintered ferro alloy having heat and wear resistance comprising: 5 to 25 wt % of at least one element selected from the group consisting of Mo and W, 2 to 10 wt % of Cr, 0.1 to 0.9 wt % of Si, less than or equal to 0.7 wt % of Mn, less than or equal to 0.05 wt % of P, 0.5 to 0.2 wt % of C, 0.5 to 0.2 wt % of B, 0.1 to 7.0 wt % of at least one boride of rare earth elements, and residual Fe and contaminants.
Claim 3
Dependent Claim
43 words
The sintered ferro alloy as set forth in claim 1, wherein said alloy further comprises less than or equal to 20 wt % of at least one element selected from the group consisting of V, Nb, Ta, Ti, Zr, Hf, Co and Ni.
Claim 4
Dependent Claim
24 words
The sintered ferro alloy as set forth in claim 1, wherein said boride of rare earth elements is in the form of a hexaboride.
Claim 5
Dependent Claim
36 words
The sintered ferro alloy as set forth in claim 1, wherein said rare earth elements comprise at least one element selected from the group consisting of La, Ce, Nd, Sm, Eu, Gd, Yb, Y and Sc.
Claim 6
Dependent Claim
107 words
A valve seat which is formed from a sintered ferro alloy having heat and wear resistance, wherein said ferro alloy comprises: 5 to 25 wt % of at least one element selected from the group consisting of Mo and W, 2 to 10 wt % of Cr, 0.1 to 0.9 wt % of Si, less than or equal to 0.7 wt % of Mn, less than or equal to 0.05 wt % of P, 0.5 to 2.0 wt % of C, 0.5 to 2.0 wt % of B, 0.1 to 7.0 wt % of at least one boride of rare earth elements, and residual Fe and contaminants.
Claim 7
Dependent Claim
107 words
A valve seat which is formed from a sintered ferro alloy having heat and wear resistance, wherein said ferro alloy comprises: 5 to 25 wt % of at least one element selected from the group consisting of Mo and W, 2 to 10 wt % of Cr, 0.1 to 0.9 wt % of Si, less than or equal to 0.7 wt % of Mn, less than or equal to 0.05 wt % of P, 0.5 to 2.0 wt % of C, 0.5 to 2.0 wt % of B, 0.1 to 7.0 wt % of at least one boride of rare earth elements, and residual Fe and contaminants.
Claim 8
Dependent Claim
42 words
The value seat as set forth in claim 5, wherein said alloy further comprises less than or equal to 20 wt % of at least one element selected from the group consisting of V, Nb, Ta, Ti, Zr, Hf, Co and Ni.
Claim 9
Dependent Claim
23 words
The valve set as set forth in claim 5, wherein said boride of rare earth elements is in the form of a hexaboride.
Claim 10
Dependent Claim
35 words
The valve seat as set forth in claim 5, wherein said rare earth elements comprise at least one element selected from the group consisting of La, Ce, Nd, Sm, Eu, Gd, Yb, Y and Sc.
Claim 11
Dependent Claim
136 words
A process for forming a sintered ferro alloy having heat and wear resistance, said process comprising the steps of: mixing particles of 5 to 25 wt % of at least one element selected from the group consisting of Mo and W, 2 to 10 wt % of Cr, 0.1 to 0.9 wt % of Si, less than or equal to 0.7 wt % of Mn, less than or equal to 0.05 wt % of P, 0.5 to 2.0 wt % of C, 0.5 to 2.0 wt % of B, 0.1 to 7.0 wt % of at least one boride of rare earth elements, pressurizing the mixture of particles in an Fe matrix, sintering the pressurized particles at the temperature of 1150° C. to 1260° C. for 60 min., and performing heat treatment of resultant sintered mixture.
Claim 12
Dependent Claim
136 words
A process for forming a sintered ferro alloy having heat and wear resistance, said process comprising the steps of: mixing particles of 5 to 25 wt % of at least one element selected from the group consisting of Mo and W, 2 to 10 wt % of Cr, 0.1 to 0.9 wt % of Si, less than or equal to 0.7 wt % of Mn, less than or equal to 0.05 wt % of P, 0.5 to 2.0 wt % of C, 0.5 to 2.0 wt % of B, 0.1 to 7.0 wt % of at least one boride of rare earth elements, pressurizing the mixture of particles in an Fe matrix, sintering the pressurized particles at the temperature of 1150° C. to 1260° C. for 60 min., and performing heat treatment of resultant sintered mixture.
Claim 13
Dependent Claim
49 words
The process for forming a sintered ferro alloy as set forth in claim 9, wherein said mixture of particles further comprises less than or equal to 20 wt % of at least one element selected from the group consisting of V, Nb, Ta, Ti, Zr, Hf, Co and Ni.
Claim 14
Dependent Claim
29 words
The process for forming a sintered ferro alloy as set forth in claim 9, wherein said boride of rare earth elements is mixed in the form of a hexaboride.
Claim 15
Dependent Claim
40 words
The process for forming a sintered ferro alloy as set forth in claim 9, wherein said rare earth elements comprise at least one element selected from the group consisting of La, Ce, Nd, Sm, Eu, Gd, Yb, Y and Sc.
Claim 16
Dependent Claim
26 words
The process for forming a sintered ferro alloy as set forth in claim 9, wherein said boride is added as atomized particles of a Fe--Mo--W--Cr--(V)--Si--(Mn)--(Co)--borides--C alloy.
Claim 17
Dependent Claim
23 words
The process for forming a sintered ferro alloy as set forth in claim 9, wherein said boride is added separately as boride particles.
Claim 18
Dependent Claim
27 words
The process for forming a sintered ferro alloy as set forth in claim 9, wherein said heat treatment comprises quenching and tempering of said resultant sintered mixture.
Claim 19
Dependent Claim
13 words
A sintered ferro alloy consisting essentially of the components recited in claim 1.
Claim 20
Dependent Claim
24 words
A valve seat which is formed from a sintered ferro alloy, wherein said ferro alloy consists essentially of the components recited in claim 5.
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) | 1993-10-29 | 1994-04-30 | 1994-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-29 | 1998-04-30 | 1998-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-29 | 2002-04-30 | 2002-10-30 | $7700.00 | Window Closed / Lapsed |