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AssigneesLaboratoire Suisse de Recherches Horlogeres, Gutehoffnungshutte Sterkrade Aktiengesellschaft
InventorsHans Gass, Hans E. Hintermann, Hartmut Griepentrog
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A diffusion barrier and separation substance for metal parts which adjoin each other in an oxygen-free, inert and preferably a helium-containing atmosphere such as used in a closed-cycle high temperature reactor or gas turbine comprises first and second adjoining metal parts with a hexagonal boron nitride placed between said parts. The hexagonal boron nitride is applied to the boundary surface of the metal parts in an aqueous or organic suspension prepared as a pasty, putty-like or brushable liquid substance. The substance contains from 5 to 50% of boron nitride, from 0.5 to 30% of binders and from 2 to 6% of swelling agents and 50 to 90% liquid suspension medium. The suspension medium may advantageously contain an anti-corrosive agent and in addition the formed protective film is burned from 0.25 to 3 hours at a temperature of from 100.degree. to 500.degree. C.
A diffusion barrier and separation substance for metal parts adjoining each other in an oxygen-free, inert, and preferably in a helium-containing atmosphere such as is used in a closed-cycle high-temperature reactor, comprising first and second metal parts with a hexagonally crystallized boron nitride forming a diffusion barrier and separation between said parts, wherein said hexagonally crystallized boron nitride is applied as a suspension to the adjoining metal parts, said metal parts being of a nickel-containing alloy and having smooth boundary surfaces therebetween, said parts being mounted for sliding relative movement in a thermoelastic suspension.
A diffusion barrier and separation substance for metal parts adjoining each other in an oxygen-free, inert, and preferably in a helium-containing atmosphere such as is used in a closed-cycle high-temperature reactor, comprising first and second metal parts with a hexagonally crystallized boron nitride forming a diffusion barrier and separation between said parts, said hexagonally crystallized boron nitride being applied to the boundary surface between the metal parts in an aqueous suspension prepared as a pasty liquid comprising from 5 to 50% of hexagonal boron nitride, 0.5 to 30% of binders, 2 to 6% of swelling agents, and 50 to 95% of a liquid suspending medium to form a protective film.
Dependencies are inferred from the claim text.