US3725017A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coated nervous substrate
Assignee: Sealed Power Technologies LP
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Filing: 1970-01-07
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Granted: 1973-04-03
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Expires: 1990-01-07
Abstract
Abstract This invention relates to an alloy useful as a hard facing material. The alloy comprises a matrix such as a nickel-chromium matrix containing a separate interstitially boron-hardened tungsten phase. The alloy is used as a facing or coating for a number of base materials, and in particular as a piston ring facing. The invention is also concerned with a method of making said alloy by utilizing a plasma jet spray technique.
Inventors
- 👤 H Prasse
- 👤 Cormick H Mc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:23
CPC Classifications
C; C22; C22C; C22C27/00; C22C27/04; B; B05; B05B; B05B7/00; B05B7/16; B05B7/22; B05B7/222; B05B7/226; C22C19/00; C22C19/03; C22C19/05; C22C19/051; C22C19/057; C23; C23C; C23C4/00; C23C4/04; C23C4/06; C23C4/067; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9335; Y10S428/934; Y10S428/937; Y10T; Y10T428/00; Y10T428/12; Y10T428/12007; Y10T428/12493; Y10T428/12771; Y10T428/12861; Y10T428/12937
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
27 words
A piston seal as defined by claim 1, wherein said matrix amounts to from about 32 to about 44 percent by volume of said hard facing material.
Claim 2
Dependent Claim
24 words
A piston seal as defined by claim 1, wherein said tungsten-boron phase comprises free tungsten metal and contains substantially no carbon or tungsten carbide.
Claim 3
Dependent Claim
24 words
A piston seal as defined by claim 3, wherein said tungsten-boron phase has a hardness of from about 1600 to 3800 Knoop Hardness number.
Claim 4
Dependent Claim
31 words
A piston seal as defined by claim 1, wherein said tungsten-boron phase is present in an amount equal to from 44 to 57 percent by volume of said hard facing material.
Claim 5
Dependent Claim
30 words
A piston seal as defined by claim 1, wherein said mixture of nickel and chromium comprises a nickel-chromium alloy phase having a Knoop Hardness number of from 850 to 1820.
Claim 6
Dependent Claim
31 words
A piston seal as defined by claim 2, wherein the tungsten-boron phase is present in an amount equal to from 44 to 57 percent by volume of said hard facing material.
Claim 7
Dependent Claim
23 words
A piston seal in accordance with claim 2, wherein said facing mAterial contains from 1.1 to 6.2 percent by volume of aluminum oxide.
References Cited (Backward Citations)
US3313633A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |