Patent US4579703A successfully refreshed from Google Patents.
US4579703A
Expired / Lapsed
US
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Method of manufacturing articles of ceramic material
Assignee: ABB Norden Holding AB
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Filing: 1982-03-08
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Granted: 1986-04-01
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Expires: 2002-03-08
Abstract
Abstract In the manufacture of an article of ceramic material, for example a bladed turbine wheel of silicon nitride, there is first formed a plurality of article parts, at least one of which is a shaped powder body formed from powder of ceramic material mixed with a plasticizer, after which the plasticizer is driven off by a suitable heating operation. The article parts are then assembled together into a configuration conforming to that of the article to be manufactured, and the assembled article parts are surrounded with a gas-impermeable layer, for example a layer of glass. Finally, the assembled parts are isostatically pressed at elevated temperature to form the assembled article parts into a dense, homogeneous article.
Inventors
- 👤 Jan Adlerborn
- 👤 Hans Larker
- 👤 Bertil Mattsson
- 👤 Jan Nilsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:46
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/12; F01D5/28; F01D5/284; B; B22; B22F; B22F3/00; B22F3/12; B22F3/1208; B22F3/1216; B22F3/1225; B22F5/00; B22F5/04; B22F7/00; B22F7/06; B22F7/062; B28; B28B; B28B1/00; B28B1/002; C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/584; C04B35/593; C04B35/622; C04B35/64; C04B35/645; C04B35/6455
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
156 words
A method of manufacturing an article of ceramic material, comprising the steps of (a) forming a plurality of shaped article parts from a composition containing a powder of ceramic material, at least one of said shaped article parts formed from a composition containing a powder of ceramic material mixed with a plasticizer, (b) driving off the plasticizer contained in said at least one shaped article part, (c) assembling said plurality of shaped article parts together into a configuration conforming to that of the article to be manufactured, at least one gap being left between two of the assembled shaped article parts, (d) applying sufficient jointing material comprising a powder mixed with a plasticizer over the gaps between the assembled shaped article parts to bridge said gaps, (e) driving off the plasticizer from said jointing material, (f) surrounding the assembled article parts with a gas-impermeable layer, and (g) isostatically pressing the assembled article parts at elevated temperature.
Claim 2
Independent Claim
156 words
A method of manufacturing an article of ceramic material, comprising the steps of (a) forming a plurality of shaped article parts from a composition containing a powder of ceramic material, at least one of said shaped article parts formed from a composition containing a powder of ceramic material mixed with a plasticizer, (b) driving off the plasticizer contained in said at least one shaped article part, (c) assembling said plurality of shaped article parts together into a configuration conforming to that of the article to be manufactured, at least one gap being left between two of the assembled shaped article parts, (d) applying sufficient jointing material comprising a powder mixed with a plasticizer over the gaps between the assembled shaped article parts to bridge said gaps, (e) driving off the plasticizer from said jointing material, (f) surrounding the assembled article parts with a gas-impermeable layer, and (g) isostatically pressing the assembled article parts at elevated temperature.
Claim 3
Dependent Claim
15 words
The method as claimed in claim 1, wherein said gas-impermeable layer is made of glass.
Claim 4
Dependent Claim
51 words
The method as claimed in claim 1, wherein said gas-impermeable layer is made of a layer of a glass material which forms a gas-impermeable layer when heated, and wherein said method includes between steps (f) and (g) the step of heating said layer of glass material to form said gas-impermeable layer.
Claim 5
Dependent Claim
28 words
The method as claimed in claim 1, wherein a first of said shaped article parts has a greater cross-sectional area than a second of said shaped article parts.
Claim 6
Dependent Claim
60 words
The method as claimed in claim 4, wherein in step (a) said first and second shaped article parts are each formed by pressing a composition containing a mixture of powder of ceramic material and a plasticizer, the plasticizer employed in forming said first article part having a lower molecular weight than the plasticizer employed in forming said second article part.
Claim 7
Dependent Claim
17 words
The method as claimed in claim 1, wherein said powder of ceramic material is silicon nitride powder.
Claim 8
Dependent Claim
31 words
The method as claimed in claim 6, wherein said plasticizer is selected from the group consisting of methyl cellulose, cellulose nitrate, an acrylic binder, a wax and a mixture of waxes.
Claim 9
Dependent Claim
39 words
The method as claimed in claim 1, wherein said shaped article parts consist of a hub part which includes a shaft and a ring part which includes projecting blades, the manufactured article of ceramic material being a turbine wheel.
Claim 10
Dependent Claim
44 words
The method as claimed in claim 8, wherein said ring part is made of a material having a high creep strength at a high temperature and said hub part is made of a material having a high strength at a low or medium-high temperature.
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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) | 1989-03-31 | 1989-09-30 | 1990-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-31 | 1993-09-30 | 1994-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-31 | 1997-09-30 | 1998-04-01 | $7700.00 | Window Closed / Lapsed |