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US4574459A
Expired / Lapsed
US
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Extrusion die manufacture
Assignee: Corning Glass Works
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Filing: 1984-11-05
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Granted: 1986-03-11
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Expires: 2004-11-05
Abstract
Abstract This invention relates to a method for forming a die for use in fabricating a ceramic honeycomb monolith structure having passages separated by walls having predetermined thicknesses. The method involves forming slots in the die and then applying a uniform coating of iron boride, chromium carbide, aluminum oxide, titanium carbide, titanium nitride or titanium carbonitride to the slot-defining surfaces of the die through CVD, the coating ranging in thickness up to 30 microns and being controlled in thickness to ±1 micron.
Inventors
- 👤 Donald C. Peters
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:15
CPC Classifications
B; B23; B23P; B23P15/00; B23P15/24; B23P15/243; B28; B28B; B28B3/00; B28B3/20; B28B3/26; B28B3/2663; B28B3/269; B28B7/00; B28B7/34; B28B7/346; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49888; Y10T29/4998; Y10T29/49982; Y10T29/49986; Y10T29/49995; Y10T29/49996
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
90 words
A method for forming an extrusion die suitable for fabricating a ceramic honeycomb monolith structure having separated walls of predetermined thicknesses in parallel relationship to the longitudinal axis of said structure by forming slots in the die, and then applying a uniform coating selected from the group of iron boride, chromium carbide, aluminum oxide, titanium carbide, titanium nitride, and titanium carbonitride to the slot-defining surfaces of the die through chemical vapor deposition, that coating ranging in thickness up to about 30 microns and being controlled in thickness to ±1 micron.
Claim 2
Independent Claim
90 words
A method for forming an extrusion die suitable for fabricating a ceramic honeycomb monolith structure having separated walls of predetermined thicknesses in parallel relationship to the longitudinal axis of said structure by forming slots in the die, and then applying a uniform coating selected from the group of iron boride, chromium carbide, aluminum oxide, titanium carbide, titanium nitride, and titanium carbonitride to the slot-defining surfaces of the die through chemical vapor deposition, that coating ranging in thickness up to about 30 microns and being controlled in thickness to ±1 micron.
Claim 3
Dependent Claim
17 words
A method according to claim 1 wherein said coating ranges less than about 20 microns in thickness.
Claim 4
Dependent Claim
29 words
A method according to claim 1 wherein said ceramic honeycomb monolith structure has at least 400 passages per square inch separated by walls having thicknesses of less than 0.008".
Claim 5
Dependent Claim
75 words
An extrusion die suitable for fabricating a ceramic honeycomb monolith structure having separated walls of predetermined thicknesses in parallel relationship to the longitudinal axis of said structure, said die consisting essentially of steel, the slot-defining surfaces thereof having a uniform coating thereon ranging in thickness up to 30 microns and being controlled in thickness to ±1 micron selected from the group of iron boride, chromium carbide, aluminum oxide, titanium carbide, titanium nitride, and titanium carbonitride.
Claim 6
Dependent Claim
75 words
An extrusion die suitable for fabricating a ceramic honeycomb monolith structure having separated walls of predetermined thicknesses in parallel relationship to the longitudinal axis of said structure, said die consisting essentially of steel, the slot-defining surfaces thereof having a uniform coating thereon ranging in thickness up to 30 microns and being controlled in thickness to ±1 micron selected from the group of iron boride, chromium carbide, aluminum oxide, titanium carbide, titanium nitride, and titanium carbonitride.
Claim 7
Dependent Claim
18 words
An extrusion die according to claim 4 wherein said coating ranges less than about 20 microns in thickness.
Claim 8
Dependent Claim
20 words
An extrusion die according to claim 4 wherein said coating consists of at least two superposed layers of different composition.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-03-10 | 1989-09-09 | 1990-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-10 | 1993-09-09 | 1994-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-10 | 1997-09-09 | 1998-03-11 | $7700.00 | Window Closed / Lapsed |