US5141574A
Expired / Lapsed
US
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Process of forming dispersions in titanium alloys by melting and precipitation
Assignee: Nippon Steel Corp
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Filing: 1991-08-02
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Granted: 1992-08-25
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Expires: 2011-08-02
Abstract
Abstract A wear-resistant titanium alloy containing titanium carbides which are crystallized and/or precipitated and are dispersed in the beta -phase matrix is disclosed. The alloy may further comprise alpha -phase and/or additional hard particles dispersed in the beta -phase matrix.
Inventors
- 👤 Wataru Takahashi
- 👤 Yoshihito Sugimoto
- 👤 Mutsuo Nakanishi
- 👤 Yoshiaki Shida
- 👤 Minoru Okada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:33
CPC Classifications
C; C22; C22C; C22C32/00; C22C32/0047; C22C32/0052; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12486; Y10T428/12493; Y10T428/12535; Y10T428/12576
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
33 words
A process for manufacturing a wear-resistant titanium based alloy comprising melting a mixture of a pure titanium and/or titanium alloy+carbide containing a β-phase-forming metallic element, then crystallizing and/or precipitating and dispersing titanium carbide.
Claim 2
Dependent Claim
33 words
A process for manufacturing a wear-resistant titanium based alloy comprising melting a mixture of a pure titanium and/or titanium alloy+carbide containing a β-phase-forming metallic element, then crystallizing and/or precipitating and dispersing titanium carbide.
Claim 3
Dependent Claim
21 words
A process for manufacturing a wear-resistant titanium alloy as defined in claim 1 wherein the mixture further comprises additional hard particles.
Claim 4
Dependent Claim
26 words
A process for manufacturing a wear-resistant titanium alloy as defined in claim 1, further comprising aging the resulting wear-resistant titanium alloy to precipitate and disperse α-phase.
Claim 5
Dependent Claim
27 words
A process for manufacturing a wear-resistant titanium alloy as defined in claim 1 wherein the carbide containing a β-phase-forming metallic element is tungsten carbide and/or chromium carbide.
Claim 6
Dependent Claim
25 words
The process of claim 1, wherein titanium carbides are crystallized from a melt containing titanium or precipitated from a β-phase of the titanium based alloy.
Claim 7
Dependent Claim
36 words
The process of claim 1, wherein the carbide containing the β-phase forming metallic element comprises at least one carbide selected from the group consisting of W 2 C, Cr 3 C 2 and Mo 2 C.
Claim 8
Dependent Claim
17 words
The process of claim 1, wherein the titanium based alloy contains 0.2 to 5% by weight carbon.
Claim 9
Dependent Claim
16 words
The process of claim 1, wherein the titanium carbides have diameters of 0.5 to 25 μm.
Claim 10
Dependent Claim
20 words
The process of claim 1, wherein the titanium carbides are dispersed in a β-phase matrix of the titanium based alloy.
Claim 11
Dependent Claim
15 words
The process of claim 1, wherein the titanium based alloy has a single β-phase microstructure.
Claim 12
Dependent Claim
36 words
The process of claim 1, wherein the carbide containing the β-phase forming metallic element comprises at least one carbide selected from the group consisting of W 2 C, Cr 3 C 2 and Mo 2 C.
Claim 13
Dependent Claim
26 words
A process for manufacturing a wear-resistant titanium alloy as defined in claim 2, further comprising aging the resulting wear-resistant titanium alloy to precipitate and disperse α-phase.
Claim 14
Dependent Claim
47 words
A process for manufacturing a titanium based alloy article which has a sliding surface, comprising hard-facing on the sliding surface a mixture of a pure titanium powder and/or titanium alloy powder+powder of a carbide containing a β-phase-forming metallic element, then crystallizing and/or precipitating and dispersing titanium carbide.
Claim 15
Dependent Claim
47 words
A process for manufacturing a titanium based alloy article which has a sliding surface, comprising hard-facing on the sliding surface a mixture of a pure titanium powder and/or titanium alloy powder+powder of a carbide containing a β-phase-forming metallic element, then crystallizing and/or precipitating and dispersing titanium carbide.
Claim 16
Dependent Claim
19 words
A process for manufacturing an article as defined in claim 13 wherein the mixture further comprises additional hard particles.
Claim 17
Dependent Claim
23 words
A process for manufacturing an article as defined in claim 13, further comprising aging the resulting hard-facing layer to precipitate and disperse α-phase
Claim 18
Dependent Claim
25 words
A process for manufacturing an article as defined in claim 13 wherein the carbide containing a β-phase-forming metallic element is tungsten carbide and/or chromium carbide.
Claim 19
Dependent Claim
33 words
A process for manufacturing an articles made as defined in claim 13 wherein the pure titanium powder and/or titanium alloy powder has a particle size of 60-250 mesh and has a polygonal shape.
Claim 20
Dependent Claim
19 words
A process for manufacturing an article as defined in claim 13 wherein the article is an automobile engine valve.
Claim 21
Dependent Claim
22 words
A process for manufacturing an article as defined in claim 13 wherein the article is formed as one piece by hot forging.
Claim 22
Dependent Claim
54 words
A process for manufacturing an article as defined in claim 13 wherein hard-facing is carried out using a cored wire comprising a sheath made of pure titanium and/or titanium alloy and a packed powder containing pure titanium powder and/or titanium alloy powder together with a powder of a carbide containing a β-phase-forming metallic element.
Claim 23
Dependent Claim
32 words
A process for manufacturing an article as defined in claim 13 wherein hard-facing is carried out using a wire made of a titanium alloy which contains titanium carbide in the β-phase matrix.
Claim 24
Dependent Claim
25 words
The process of claim 13, wherein titanium carbides are crystallized from a melt containing titanium or precipitated from a β-phase of the titanium based alloy.
Claim 25
Dependent Claim
17 words
The process of claim 13, wherein the titanium based alloy contains 0.2 to 5% by weight carbon.
Claim 26
Dependent Claim
16 words
The process of claim 13, wherein the titanium carbides have diameters of 0.5 to 25 μm.
Claim 27
Dependent Claim
20 words
The process of claim 13, wherein the titanium carbides are dispersed in a β-phase matrix of the titanium based alloy.
Claim 28
Dependent Claim
15 words
The process of claim 13, wherein the titanium based alloy has a single β-phase microstructure.
Claim 29
Dependent Claim
23 words
A process for manufacturing an article as defined in claim 14, further comprising aging the resulting hard-facing layer to precipitate and disperse α-phase.
Claim 30
Dependent Claim
20 words
A process for manufacturing an article as defined in claim 20 wherein the packed powder further contains additional hard particles.
Claim 31
Dependent Claim
20 words
A process for manufacturing an article as defined in claim 21 wherein the titanium alloy further contains additional hard particles.
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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) | 1995-08-25 | 1996-02-24 | 1996-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-08-25 | 2000-02-24 | 2000-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-08-25 | 2004-02-24 | 2004-08-25 | $7700.00 | Window Closed / Lapsed |