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1. (WO1979000247) COATING OF SUBSTRATES
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1979/000247 International Application No.: PCT/GB1978/000029
Publication Date: 17.05.1979 International Filing Date: 23.10.1978
IPC:
B01D 53/86 (2006.01) ,B01J 13/00 (2006.01) ,B01J 37/02 (2006.01) ,C23D 5/02 (2006.01) ,G21C 3/20 (2006.01)
B PERFORMING OPERATIONS; TRANSPORTING
01
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
D
SEPARATION
53
Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases or aerosols
34
Chemical or biological purification of waste gases
74
General processes for purification of waste gases; Apparatus or devices specially adapted therefor
86
Catalytic processes
B PERFORMING OPERATIONS; TRANSPORTING
01
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
J
CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS, COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
13
Colloid chemistry, e.g. the production of colloidal materials or their solutions, not otherwise provided for; Making microcapsules or microballoons
B PERFORMING OPERATIONS; TRANSPORTING
01
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
J
CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS, COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
37
Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
02
Impregnation, coating or precipitation
C CHEMISTRY; METALLURGY
23
COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
D
ENAMELLING OF, OR APPLYING A VITREOUS LAYER TO, METALS
5
Coating with enamels or vitreous layers
02
by wet methods
G PHYSICS
21
NUCLEAR PHYSICS; NUCLEAR ENGINEERING
C
NUCLEAR REACTORS
3
Reactor fuel elements or their assemblies; Selection of substances for use as reactor fuel elements
02
Fuel elements
04
Constructional details
16
Details of the construction within the casing
20
with coating on fuel or on inside of casing; with non-active interlayer between casing and active material
Applicants:
Inventors:
Priority Data:
45471/7701.11.1977GB
Title (EN) COATING OF SUBSTRATES
(FR) REVETEMENT DE SUBSTRATS
Abstract:
(EN) The invention is concerned with providing substrates with coatings obtainable from sols, for example to protect the substrate (such as in nuclear reactors or hydrocarbon cracking plant) or to provide a carrier for catalytically active material. Hitherto, coatings obtained from sols have had a high porosity and high surface area so that they have not been entirely satisfactory for the above applications. In the invention, dense, low-porosity coatings are provided by contacting the substrate with a sol of refractory material (e.g. CeO2 or SiO2) convertible to a gel of density at least 40% of the theoretical density of the refractory material, and converting the sol to the gel. Optionally, the gel may be converted to a ceramic coating by firing.
(FR) Application sur des substrats de revetements obtenus a partir de solutions colloidales, par exemple pour proteger le substrat (comme ceux utilises dans les reacteurs nucleaires ou dans les installations de craquage d"hydrocarbures) ou pour fournir un support a un materiau presentant une activite catalytique. Jusqu"a present, les revetements obtenus a partir des solutions colloidales avaient un degre eleve de porosite et une forte surface specifique de sorte qu"ils ne donnaient pas entierement satisfaction pour les applications ci-dessus mentionnees. Selon l"invention, des revetements denses, de faible porosite sont produits en mettant le substrat au contact d"une solution colloidale d"un materiau refractaire (par exemple CeO2 ou SiO2) convertible en un gel de densite au moins egale a 40% de la densite theorique du materiau refractaire, et en convertissant la solution colloidale en gel. De plus, le gel peut etre transforme en un revetement ceramique par cuisson.
Designated States:
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
JPS54500020