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1. (WO1991007242) TREATMENT OF METALS FOR COATING OR ACTIVATION
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1991/007242 International Application No.: PCT/US1990/005204
Publication Date: 30.05.1991 International Filing Date: 13.09.1990
Chapter 2 Demand Filed: 14.05.1991
IPC:
B01J 25/00 (2006.01) ,B22F 7/00 (2006.01) ,B22F 9/16 (2006.01) ,C06B 45/14 (2006.01) ,C23C 26/00 (2006.01)
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
25
Catalysts of the Raney type
B PERFORMING OPERATIONS; TRANSPORTING
22
CASTING; POWDER METALLURGY
F
WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
7
Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting
B PERFORMING OPERATIONS; TRANSPORTING
22
CASTING; POWDER METALLURGY
F
WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
9
Making metallic powder or suspensions thereof; Apparatus or devices specially adapted therefor
16
using chemical processes
C CHEMISTRY; METALLURGY
06
EXPLOSIVES; MATCHES
B
EXPLOSIVE OR THERMIC COMPOSITIONS; MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES
45
Compositions or products which are defined by structure or arrangement of component or product
12
having contiguous layers or zones
14
a layer or zone containing an inorganic explosive or an inorganic thermic component
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
C
COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
26
Coating not provided for in groups C23C2/-C23C24/87
Applicants:
ALLOY SURFACES COMPANY, INC. [US/US]; 100 Locke Road Edgemoor Wilmington, DE 19808, US
Inventors:
BALDI, Alfonso, L.; US
Agent:
BAKALAR, Nathan; 1220 Market Building P.O. Box 2207 Wilmington, DE 19899, US
Priority Data:
433,11908.11.1989US
440,02621.11.1989US
472,66330.01.1990US
Title (EN) TREATMENT OF METALS FOR COATING OR ACTIVATION
(FR) TRAITEMENT DES METAUX EN VUE DE LEUR REVÊTEMENT OU DE LEUR ACTIVATION
Abstract:
(EN) Coating with high-melting metals can be simplified by alloying high-melting metal with sufficient aluminum to make low-melting alloy that is applied, bonded in place, and then subjected to the leaching out of some or most of the aluminum. The resulting surface is porous and will receive and hold top coatings as from spraying nozzles (12). Leached surface can be pyrophoric and top coating can be exothermically combustible. Pyrophoric powder can also be coated on boron or carbon fibers or sintered with combustible particles. Porosity can be created by subjecting workpiece to diffusion conditions in contact with depleting material such as powdered nickel or high-nickel aluminides or cobalt or high-cobalt aluminides. Aluminum particles can be electrophoretically deposited on foil and then diffused in. Leaching aluminum out with caustic is improved when a little H2O2 is present in the caustic in the leach tank (22). Subsequent treatment of the leached surface with weak acid further improves pyrophoricity, and folding of the pyrophoric member extends its pyrophorically-generated high temperature dwell. Resin foil containing pyrophoric particles makes effective decoy.
(FR) On peut simplifier le revêtement à l'aide de métaux à point de fusion élevé en ajoutant à un métal à pont de fusion élevé suffisamment d'aluminium pour faire un alliage à bas point de fusion qu'on applique, qu'on fait adhérer in-situ, et qu'on soumet ensuite à une élimination par lessivage d'une certaine quantité ou d'une grande partie de l'aluminium. La surface résultante est poreuse et elle pourra recevoir et permettre l'adhérence de revêtements de surface (12). La surface lessivée peut être pyrophorique et le revêtement de surface peut être combustible par voie exothermique. La poudre pyrophorique peut également être déposée sur des fibres de bore ou de carbone ou frittée avec des particules combustibles (16). On peut obtenir la porosité en soumettant la pièce à des conditions de diffusion en la mettant en contact avec un matériau d'apprauvrissement comme des aluminures pulvérulents à tenuer en nickel faible ou forte ou à teneur en cobalt faible ou forte. Les particules d'aluminium peuvent être déposées par électrophorèse sur la feuille et elles se diffusent ensuite. On améliore l'élimination par lessivage de l'aluminium avec du caustique lorsque celui-ci comprend un peu de H2O2 dans la cuve de lessivage (22). Le traitement ultérieur de la surface lessivée, avec un acide faible, améliore la pyrophoricité, et le pliage de l'élément pyrophophorique augmente le temps de maintien de la température élevée résultant de l'action pyrophorique. La feuille de résine contenant des particules pyrophoriques constitue un leurre efficace.
Designated States: CA, JP
European Patent Office (AT, BE, CH, DE, DK, ES, FR, GB, IT, LU, NL, SE)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
EP0500651JPH06502378CA2073058