US4934254A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Face seal with long-wearing sealing surface
Assignee: Tmt Research Development Inc
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Filing: 1984-03-29
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Granted: 1990-06-19
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Expires: 2004-03-29
Abstract
Abstract Mechanical seals are imroved in wear properties, erosion, corrosion and galling resistance by forming a diffusion coating in the seal structure surface comprising an intermetallic compound of the seal structure iron, nickel or cobalt base metal and one or more of aluminum, boron, silicon and carbon.
Inventors
- 👤 Eugene V. Clark
- 👤 George K. Sievers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:15
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/34; F16J15/3496; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9335; Y10S428/941; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12771; Y10T428/12861; Y10T428/12931
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
54 words
Method of forming a long wearing mechanical sealing surface on a nickel, iron or cobalt base structure which includes diffusing an intermetallic compound forming element into the surface of said structure from a diffusion pack under intermetallic compound forming conditions with said base metal to form an intermetallic compound defining said mechanical sealing surface.
Claim 2
Dependent Claim
54 words
Method of forming a long wearing mechanical sealing surface on a nickel, iron or cobalt base structure which includes diffusing an intermetallic compound forming element into the surface of said structure from a diffusion pack under intermetallic compound forming conditions with said base metal to form an intermetallic compound defining said mechanical sealing surface.
Claim 3
Dependent Claim
68 words
Mechanical seal having a first part comprising an iron, nickel or cobalt base structure having a structure surface, and a relatively movable second part cooperating with said first part structure at said surface, said first part structure having in contact with said second part in mechanical seal-defining relation a surface layer replacing said structure surface and consisting essentially of a diffusion coating-formed intermetallic compound of the base metal.
Claim 4
Dependent Claim
68 words
Mechanical seal having a first part comprising an iron, nickel or cobalt base structure having a structure surface, and a relatively movable second part cooperating with said first part structure at said surface, said first part structure having in contact with said second part in mechanical seal-defining relation a surface layer replacing said structure surface and consisting essentially of a diffusion coating-formed intermetallic compound of the base metal.
Claim 5
Dependent Claim
19 words
Mechanical seal according to claim 2, in which said second part comprises an iron, nickel or cobalt base structure.
Claim 6
Dependent Claim
47 words
Mechanical seal according to claim 2, in which said second part comprises an iron, nickel or cobalt base structure, said second part structure having a surface in contact with said first part structure surface and consisting essentially of a diffusion coating-formed intermetallic compound of the base metal.
Claim 7
Dependent Claim
38 words
Mechanical seal according to claim 2, in which said compound comprises said base metal and at least one of aluminum, boron, silicon, and carbon, and extends to both sides of the original surface boundary of said structure surface.
Claim 8
Dependent Claim
18 words
Mechanical seal according to claim 4, in which said compound comprises iron, nickel, cobalt or iron nickel aluminide.
Claim 9
Dependent Claim
16 words
Mechanical seal according to claim 4, in which said compound comprises iron, nickel, or cobalt boride.
Claim 10
Dependent Claim
19 words
Mechanical seal according to claim 4, in which said compound comprises iron, cobalt, iron, nickel, silicon or boron carbide.
Claim 11
Dependent Claim
17 words
Mechanical seal according to claim 4 in which said compound comprises iron, nickel, cobalt or boron silicide.
Claim 12
Dependent Claim
25 words
Mechanical seal according to claim 2, in which said surface layer compound contains about 30% aluminum by weight and the balance nickel, iron or cobalt.
Claim 13
Dependent Claim
25 words
Mechanical seal according to claim 2, in which said surface layer compound contains about 10% boron by weight and the balance nickel, iron or cobalt.
Claim 14
Dependent Claim
14 words
Mechanical seal according to claim 11, in which said surface layer comprises nickel aluminide.
Claim 15
Dependent Claim
25 words
Mechanical seal according to claim 12, including also small but effective amounts of tantalum, molybdenum, chromium, zirconium, titanium or silicon diffused into said surface layer.
Claim 16
Dependent Claim
25 words
Mechanical seal according to claim 2, including also small but effective amounts of tantalum, molybdenum, chromium, zirconium, titanium or silicon diffused into said surface layer.
Claim 17
Dependent Claim
23 words
Mechanical seal according to claim 2, in which the first part structure surface comprises a refractory metal carbide, and a base metal binder.
Claim 18
Dependent Claim
17 words
Mechanical seal according to claim 15, in which said base metal binder is nickel, iron or cobalt.
Claim 19
Dependent Claim
19 words
Mechanical seal according to claim 15, in which said refractory metal carbide is tungsten, tantalum, titanium or zirconium carbide.
Claim 20
Dependent Claim
16 words
Mechanical seal according to claim 15, including also a refractory metal boride formed in said surface.
Claim 21
Dependent Claim
22 words
Mechanical seal according to claim 15, in which said intermetallic compound comprises an aluminide of one or more of said base metals.
Claim 22
Dependent Claim
14 words
Mechanical seal according to claim 19, in which said intermetallic compound is nickel aluminide.
Claim 23
Dependent Claim
19 words
Mechanical seal according to claim 2, in which said surface layer is about 0.002 to 0.4 millimeter in depth.
Claim 24
Dependent Claim
19 words
Mechanical seal according to claim 20, in which said surface layer is about 0.02 to 0.4 millimeter in depth.
Claim 25
Dependent Claim
59 words
Method of forming a long wearing mechanical sealing surface on a nickel, iron or cobalt base structure which includes diffusing an intermetallic compound forming element into the surface of said structure to become a mechanical sealing surface from a diffusion pack under intermetallic compound forming conditions with said base metal to replace said structure surface with said intermetallic compound.
Claim 26
Dependent Claim
59 words
Method of forming a long wearing mechanical sealing surface on a nickel, iron or cobalt base structure which includes diffusing an intermetallic compound forming element into the surface of said structure to become a mechanical sealing surface from a diffusion pack under intermetallic compound forming conditions with said base metal to replace said structure surface with said intermetallic compound.
Claim 27
Dependent Claim
19 words
The method according to claim 23, including also selecting a cobalt base tungsten carbide cermet structure as said structure.
Claim 28
Dependent Claim
17 words
The method according to claim 24, including also diffusing boron into said structure from a boronzing pack.
Claim 29
Dependent Claim
17 words
The method according to claim 23, including also selecting a cobalt base metal structure as said structure.
Claim 30
Dependent Claim
17 words
The method according to claim 26, including also diffusing boron into said structure from a boronizing pack.
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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) | 1993-06-18 | 1993-12-18 | 1994-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-18 | 1997-12-18 | 1998-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-18 | 2001-12-18 | 2002-06-19 | $7700.00 | Window Closed / Lapsed |