Patent US4784984A successfully refreshed from Google Patents.
US4784984A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stainless steel ribbon for use as a catalyst carrier for automobile exhaust gas and catalyst carrier containing the ribbon coiled into a honeycomb
Assignee: Nippon Steel Corp
•
Filing: 1987-01-30
•
Granted: 1988-11-15
•
Expires: 2007-01-30
Abstract
Abstract An Al-containing stainless steel is rapidly solidified from a molten state to produce a ribbon. In catalyst carrier for the exhaust gas of automobile, the Al is utilized for the formation of α-Al 2 O 3 whiskers, which carry and rigidly bond the γ-Al 2 O 3 powder to the ribbon, as the direct carriers of noble metals.
Inventors
- 👤 Mikio Yamanaka
- 👤 Keiichi Omura
- 👤 Masayuki Tendo
- 👤 Susumu Takemura
- 👤 Takashi Sato
- 👤 Tsutomu Ozawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:13
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9445; B01D53/9454; B01J; B01J35/00; B01J35/50; B01J35/56; B01J35/57; B01J37/00; B01J37/02; B01J37/024; F; F01; F01N; F01N3/00; F01N3/08; F01N3/10; F01N3/24; F01N3/28; F01N3/2803; F01N3/2807; F01N3/281; F01N2330/00; F01N2330/02; F01N2330/04; F01N2330/30; F01N2330/32; F01N2330/321; F01N2510/00; F01N2510/06; F01N2530/00; F01N2530/06; F02; F02B; F02B1/00; F02B1/02; F02B1/04; Y; Y02; Y02A; Y02A50/00; Y02A50/20; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9335; Y10S428/941; Y10T; Y10T428/00; Y10T428/12; Y10T428/12431; Y10T428/12438; Y10T428/12458; Y10T428/12493; Y10T428/12736; Y10T428/1275; Y10T428/12757
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
125 words
A ribbon for use as a metal honeycomb of a catalyst carrier of a catalyst converter, consisting of an Al-containing stainless steel ribbon having an Al content of 20% or less and an Si coontent of 3% or less, which is produced directly by a process of solidifying the Al-containing stainless steel from a molten state thereof directly into a form of a ribbon at a cooling speed of at least 10 3 °C./sec, thereby forming an Al-concentrated layer on a surface of said ribbon as solidified, said ribbon having as a metallurgical structure a columnar structure with grain boundaries principally oriented in a direction along a thickness of the ribbon and a maximum grain diameter measured perpendicularly to the columnar axis of 30 μm.
Claim 2
Dependent Claim
125 words
A ribbon for use as a metal honeycomb of a catalyst carrier of a catalyst converter, consisting of an Al-containing stainless steel ribbon having an Al content of 20% or less and an Si coontent of 3% or less, which is produced directly by a process of solidifying the Al-containing stainless steel from a molten state thereof directly into a form of a ribbon at a cooling speed of at least 10 3 °C./sec, thereby forming an Al-concentrated layer on a surface of said ribbon as solidified, said ribbon having as a metallurgical structure a columnar structure with grain boundaries principally oriented in a direction along a thickness of the ribbon and a maximum grain diameter measured perpendicularly to the columnar axis of 30 μm.
Claim 3
Dependent Claim
17 words
A ribbon according to claim 1, wherein the Al content is from 5 to 20% by weight.
Claim 4
Dependent Claim
18 words
A ribbon according to claim 1, wherein said ribbon has a thickness of from 30 to 70 μm.
Claim 5
Dependent Claim
139 words
A carrier for a catalyst for purification of exhaust gas of an automobile, which is produced by a process of solidifying a ribbon of an Al-containing stainless steel having an Al content of 20% or less and an Si content of 3% or less from a molten state thereof directly into a form of a ribbon at a cooling speed of at least 10 3 °C./sec, thereby forming an Al-concentrated layer on a surface of said ribbon as solidified, said carrier having as a metallurgical structure a columnar structure with grain boundaries principally oriented in a direction along a thickness of the carrier and a maximum grain diameter measured perpendicularly to the columnar axis of 30 μm, coiling the ribbon at a temperature of at least 500° C. after solidification, and subsequently forming the coiled ribbon into a honeycomb.
Claim 6
Dependent Claim
139 words
A carrier for a catalyst for purification of exhaust gas of an automobile, which is produced by a process of solidifying a ribbon of an Al-containing stainless steel having an Al content of 20% or less and an Si content of 3% or less from a molten state thereof directly into a form of a ribbon at a cooling speed of at least 10 3 °C./sec, thereby forming an Al-concentrated layer on a surface of said ribbon as solidified, said carrier having as a metallurgical structure a columnar structure with grain boundaries principally oriented in a direction along a thickness of the carrier and a maximum grain diameter measured perpendicularly to the columnar axis of 30 μm, coiling the ribbon at a temperature of at least 500° C. after solidification, and subsequently forming the coiled ribbon into a honeycomb.
Claim 7
Dependent Claim
19 words
A catalyst carrier according to claim 4, wherein said ribbon has a thickness of from 30 to 70 μm.
Claim 8
Dependent Claim
35 words
A catalyst carrier according to claim 4, wherein said ribbon has an α-Al 2 O 3 layer thereon having a thickness sufficient for carrying thereon γ-Al 2 O 3 which is impregnated with noble metal.
Claim 9
Dependent Claim
24 words
A catalyst carrier according to claim 6, wherein said α-Al 1 O 3 layer is formed by heating the ribbon in an oxidizing atmosphere.
Claim 10
Dependent Claim
20 words
A catalyst carrier according to claim 7, wherein said heating is carried out in an exhaust gas of an automobile.
Claim 11
Dependent Claim
29 words
A catalyst carrier according to claim 7, wherein said α-Al 2 O.sub. layer if formed in a flake- or whisker-form by an oxidation of Al of the stainless steel.
Claim 12
Dependent Claim
24 words
A catalyst carrier according to claim 8, wherein the thickness of said α-Al 2 O 3 layer is from approximately 7 μm or more.
References Cited (Backward Citations)
GB1452982A
Cited
JPS5066492A
Cited
DE2856795A1
Cited
US4331631A
Cited
US4300956A
Cited
US4318828A
Cited
EP0091526A2
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-11-15 | 1992-05-16 | 1992-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-15 | 1996-05-16 | 1996-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-15 | 2000-05-16 | 2000-11-15 | $7700.00 | Window Closed / Lapsed |