Patent US4312682A successfully refreshed from Google Patents.
US4312682A
Expired / Lapsed
US
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Method of heat treating nickel-base alloys for use as ceramic kiln hardware and product
Assignee: Haynes International Inc
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Filing: 1979-12-21
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Granted: 1982-01-26
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Expires: 1999-12-21
Abstract
Abstract Disclosed is a NICRALY alloy containing nominally about 16% chromium, about 5.3% aluminum, about 0.02% yttrium and the balance essentially nickel, and heat treated in a manner to develop an essentially aluminum oxide surface. The NICRALY alloy is especially suited for use as components and support systems in kilns that are used in the firing steps in the manufacture of ceramic articles.
Inventors
- 👤 Robert B. H. Herchenroeder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:40
CPC Classifications
C; C22; C22C; C22C19/00; C22C19/03; C22C19/05
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
133 words
The method for producing a kiln hardware article for use in the manufacture of ceramic products including the steps of: a. providing an alloy consisting essentially of, in weight percent, 8 to 25 chromium, 2.5 to 8 aluminum, a small but effective yttrium content not exceeding over 0.04, and the balance nickel and impurities plus modifying elements optionally selected from the groups: up to 15 total Mo, Rh, Hf, W, Ta and Cb; up to 0.5 total C, B, Mg, Zr and Ca; up to 1Si, up to 2Mn, up to 20Co, up to 5Ti, and up to 30Fe b. fashioning said alloy into said article with a required shape for said use, and c. heat treating said fashioned article to provide a predominantly aluminum oxide film of the surface of said article.
Claim 2
Independent Claim
133 words
The method for producing a kiln hardware article for use in the manufacture of ceramic products including the steps of: a. providing an alloy consisting essentially of, in weight percent, 8 to 25 chromium, 2.5 to 8 aluminum, a small but effective yttrium content not exceeding over 0.04, and the balance nickel and impurities plus modifying elements optionally selected from the groups: up to 15 total Mo, Rh, Hf, W, Ta and Cb; up to 0.5 total C, B, Mg, Zr and Ca; up to 1Si, up to 2Mn, up to 20Co, up to 5Ti, and up to 30Fe b. fashioning said alloy into said article with a required shape for said use, and c. heat treating said fashioned article to provide a predominantly aluminum oxide film of the surface of said article.
Claim 3
Dependent Claim
25 words
The method of claim 1 wherein said alloy contains about 10 to 20 chromium, about 3 to 7 aluminum and about 0.005 to 0.035 yttrium.
Claim 4
Dependent Claim
23 words
The method of claim 1 wherein step "a" includes providing said alloy by ESR process and then hot and/or cold working said alloy.
Claim 5
Dependent Claim
28 words
The method of claim 1 wherein the heat treatment of step "c" comprises heat treating said article at a temperature over 2000° F. for at least one hour.
Claim 6
Dependent Claim
11 words
A kiln hardware article made by the process of claim 1.
References Cited (Backward Citations)
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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) | 1985-01-25 | 1985-07-27 | 1986-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-01-25 | 1989-07-27 | 1990-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-01-25 | 1993-07-27 | 1994-01-26 | $7700.00 | Window Closed / Lapsed |