US4485147A
Expired / Lapsed
US
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Process for producing a sintered product of copper-infiltrated iron-base alloy and a two-layer valve seat produced by this process
Assignee: Mitsubishi Metal Corp
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Filing: 1983-09-01
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Granted: 1984-11-27
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Expires: 2003-09-01
Abstract
Abstract A process for producing a Cu-infiltrated sintered Fe-base material without requiring a separate Cu infiltration step is disclosed. The process comprises the steps of preparing two powder mixes, one having a predetermined composition with a powder of infiltrating material containing Cu powder or Cu alloy powder as the primary component, and the other having a predetermined composition without said powder of infiltrating material; pressing the two powder mixes into a compact having said powder of infiltrating material present locally; and sintering the compact under ordinary conditions so as to cause the infiltrant to penetrate into the infiltrant-free area simultaneously with the sintering. Also disclosed is a two-layer valve seat produced by this process. One layer of the valve seat accounts for the principal part of the seat and is made of an Fe-base sintered material containing Cu or Cu alloy as an infiltrant, and the other layer provides a layer to contact the valve and is infiltrated with Cu through pores during the sintering.
Inventors
- 👤 Yoshio Nishino
- 👤 Seiichi Kirigaya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:02
CPC Classifications
C; C22; C22C; C22C38/00; F; F01; F01L; F01L3/00; F01L3/02; F01L3/04; C22C33/00; C22C33/02; C22C33/0207; C22C33/0242; F02; F02B; F02B1/00; F02B1/02; F02B1/04; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12042; Y10T428/1216
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
97 words
A process for producing a sintered product of a copper-infiltrated iron-base alloy comprising the following steps: (1) preparing two powder mixes, one having a predetermined composition with a powder of infiltrating material containing Cu powder or Cu alloy powder as the primary component, and the other having a predetermined composition without said powder of infiltrating material; (2) pressing the two powder mixes into a compact having said powder of infiltrating material present locally; and (3) sintering the compact under ordinary conditions so as to cause the infiltrant to penetrate into the infiltrant-free area simultaneously with the sintering.
Claim 2
Dependent Claim
97 words
A process for producing a sintered product of a copper-infiltrated iron-base alloy comprising the following steps: (1) preparing two powder mixes, one having a predetermined composition with a powder of infiltrating material containing Cu powder or Cu alloy powder as the primary component, and the other having a predetermined composition without said powder of infiltrating material; (2) pressing the two powder mixes into a compact having said powder of infiltrating material present locally; and (3) sintering the compact under ordinary conditions so as to cause the infiltrant to penetrate into the infiltrant-free area simultaneously with the sintering.
Claim 3
Dependent Claim
144 words
A process for producing a two-layer valve seat made of an iron-base sintered material comprising the following steps: (1) preparing first and second powder mixes, the first mix containing a powder of infiltrating material mainly composed of Cu powder or Cu alloy powder and which, after sintering, forms the principal part of a valve seat, and the second mix containing no powder of infiltrating material and which, after sintering, forms a layer to contact the valve; (2) pressing the two powder mixes to form a two-layer compact wherein one layer is composed of the first powder mix and the other layer is composed of the second powder mix; (3) sintering the two-layer compact under ordinary conditions so as to cause the infiltrant to move from the layer of the first powder mix to the layer of the second powder mix simultaneously with the sintering.
Claim 4
Dependent Claim
144 words
A process for producing a two-layer valve seat made of an iron-base sintered material comprising the following steps: (1) preparing first and second powder mixes, the first mix containing a powder of infiltrating material mainly composed of Cu powder or Cu alloy powder and which, after sintering, forms the principal part of a valve seat, and the second mix containing no powder of infiltrating material and which, after sintering, forms a layer to contact the valve; (2) pressing the two powder mixes to form a two-layer compact wherein one layer is composed of the first powder mix and the other layer is composed of the second powder mix; (3) sintering the two-layer compact under ordinary conditions so as to cause the infiltrant to move from the layer of the first powder mix to the layer of the second powder mix simultaneously with the sintering.
Claim 5
Dependent Claim
15 words
A two-layer seat produced from an iron-base sintered material by the process of claim 2.
Claim 6
Dependent Claim
19 words
A process according to claim 2 wherein said first powder mix contains 5 to 35 wt. % of copper.
Claim 7
Dependent Claim
26 words
A process according to claim 4 wherein said first powder mix further contains 0.01 to 4.0 wt. % of one or both of P and Sn.
Claim 8
Dependent Claim
27 words
A process according to claim 2 wherein said first powder mix contains 5 to 35 wt. % of Cu and 0.5 to 12 wt. % of Pb.
Claim 9
Dependent Claim
45 words
A process according to claim 6 wherein said first powder mix further contains 0.01 to 4.0 wt. % of one or both of P and Sn and the second powder mix containes 0.01 to 4.0 wt. % of one or both of P and Sn.
Claim 10
Dependent Claim
16 words
A two-layer valve seat produced from an iron-base sintered material by the process of claim 4.
Claim 11
Dependent Claim
16 words
A two-layer valve seat produced from an iron-base sintered material by the process of claim 5.
Claim 12
Dependent Claim
16 words
A two-layer valve seat produced from an iron-base sintered material by the process of claim 6.
Claim 13
Dependent Claim
16 words
A two-layer valve seat produced from an iron-base sintered material by the process of claim 7.
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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) | 1987-11-27 | 1988-05-28 | 1988-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-27 | 1992-05-28 | 1992-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-27 | 1996-05-28 | 1996-11-27 | $7700.00 | Window Closed / Lapsed |