EP0193701A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Method of carrying gamma-alumina by porous ceramic structure
Assignee: Denso Corp
•
Filing: 1986-01-07
•
Granted: —
•
Expires: 2006-01-07
Abstract
Abstract A method of carrying y-alumina by a porous ceramics structure includes the steps of: causing fine particles of y-alumina together with a carrier gas to flow through pores in the porous ceramics structure so as to deposite the y-alumina fine particles on the surfaces of the skeleton of the porous ceramics structure, and heating the structure with the y-aluminum particles deposited thereto to a predetermined temperature thereby fixing the y-alumina particles. The fine particles of y-alumina are formed by causing an arc discharge between the surface of molten aluminum and an aluminum electrode so as to generate vapor of aluminum, and oxidizing the aluminum vapor by an oxidizing gas which may be Ar-O 2 carrier gas which is made to flow through the pores in the porous ceramics structure.
Inventors
- 👤 Akira Takeuchi
- 👤 Yukihisa Takeuchi
- 👤 Hitoshi Yoshida
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 11:16
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/45; C04B41/50; C04B41/5025; C04B41/5031; B; B01; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01J; B01J37/00; B01J37/02; B01J37/0215; B01J37/34; B01J37/341; B01J37/347; C04B41/80; C04B41/81; C04B41/85; C04B41/87; B01J21/00; B01J21/02; B01J21/04
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
80 words
A method of carrying y-alumina by a porous ceramics structure comprising the steps of: causing both fine particles of y-alumina and a carrier gas to flow through pores in said porous ceramics structure so as to deposite said y-alumina fine particles on the surface of the skeleton around the pores of said structure; and heating said structure with said y-alumina fine particles deposited thereto to a predetermined temperature thereby fixing said y-alumina fine particles on said surface of said skeleton.
Claim 2
Independent Claim
80 words
A method of carrying y-alumina by a porous ceramics structure comprising the steps of: causing both fine particles of y-alumina and a carrier gas to flow through pores in said porous ceramics structure so as to deposite said y-alumina fine particles on the surface of the skeleton around the pores of said structure; and heating said structure with said y-alumina fine particles deposited thereto to a predetermined temperature thereby fixing said y-alumina fine particles on said surface of said skeleton.
Claim 3
Independent Claim
111 words
A method of carrying y-alumina by a porous ceramics structure comprising the steps of: generating an arc discharge between the surface of aluminum in molten state and an aluminum electrode so as to generate aluminum vapor; oxidizing said aluminum vapor to form fine particles of y-alumina; causing both the y-alumina fine particles and a carrier gas to flow through pores of said porous ceramics structure so as to deposite said y-alumina fine particles on the surface of skeleton of said structure around said pores; and heating said structure with said y-alumina fine particles deposited thereto to a predetermined temperature thereby fixing said y-alumina fine particles to the surface of said skeleton.
Claim 4
Independent Claim
111 words
A method of carrying y-alumina by a porous ceramics structure comprising the steps of: generating an arc discharge between the surface of aluminum in molten state and an aluminum electrode so as to generate aluminum vapor; oxidizing said aluminum vapor to form fine particles of y-alumina; causing both the y-alumina fine particles and a carrier gas to flow through pores of said porous ceramics structure so as to deposite said y-alumina fine particles on the surface of skeleton of said structure around said pores; and heating said structure with said y-alumina fine particles deposited thereto to a predetermined temperature thereby fixing said y-alumina fine particles to the surface of said skeleton.
Claim 5
Dependent Claim
31 words
A method for carrying y-alumina by a porous ceramics structure according to claim 2, wherein said y-alumina fine particles are formed by contact between said aluminum vapor and an oxidizing gas.
Claim 6
Dependent Claim
24 words
A method of carrying y-alumina by a porous ceramics structure according to claim 3, wherein said oxidizing gas serves also as said oxidizing gas.
Claim 7
Dependent Claim
45 words
A method of carrying y-alumina by a porous ceramics structure according to claim 4, wherein said porous ceramics structure has a multiplicity of inlet passages, a multiplicity of outlet passages and partition walls by which said inlet and outlet passages are separated from each other.
Claim 8
Dependent Claim
31 words
A method of carrying y-alumina by a porous ceramics structure according to claim 5, wherein said partition wall is constituted by a three-dimensional network-type skeleton and pores defined by said skeleton.
Claim 9
Dependent Claim
29 words
A method of carrying y-alumina by a porous ceramics structure according to claim 6, wherein said oxidizing gas is air or a mixture gas containing mainly argon and oxygen.
Claim 10
Dependent Claim
39 words
A method of carrying y-alumina by a porous ceramics structure according to claim 6, wherein a thin ceramics film is formed on the surface of said skeleton so as to close pores opening in the surface of said skeleton.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.