Method for joining rhenium to columbium
AssigneeAlliedSignal Inc.
InventorDonald Lee Mittendorf
Life of this patent
Estimating the term…
Abstract
A method for joining rhenium to columbium and columbium based alloys that minimizes the formation of brittle intermetallics. First, a layer of ruthenium is applied to both the rhenium and columbium and then heated until the ruthenium diffuses with the rhenium and columbium respectively. A braze foil is place between the two outer ruthenium layers and the assembly is heated in a range of 50.degree. C. to 100.degree. C. above the liquidus of the braze, thereby joining the rhenium to the columbium. Alternatively, the ruthenium coated surfaces are placed in contact and diffused together under a compressive load of at least 1000 psi.
Claims14
A method for joining rhenium to columbium and columbium based alloys, comprising the following steps:
- (a) providing a first article having at least a portion of rhenium;
- (b) providing a second article having at least a portion taken from the group consisting of columbium and columbium based alloys;
- (c) applying a first layer of ruthenium to said rhenium portion;
- (d) applying a second layer of ruthenium to said columbium portion;
- (e) heating said ruthenium layered rhenium portion to form a mixed layer of ruthenium and rhenium therebetween;
- (f) heating said ruthenium layered columbium portion to form a mixed layer of ruthenium and columbium therebetween;
- (g) providing a braze foil;
- (h) placing said ruthenium layered rhenium portion and said ruthenium layered columbium portion in contact with opposite sides of said braze foil;
- (i) heating the assembly of the previous step to a temperature above the liquidus of said braze;
- and
- (j) cooling the assembly of step (i) to ambient temperature.
A method for joining rhenium to columbium and columbium based alloys, comprising the following steps:
- (a) providing a first article having at least a portion of rhenium;
- (b) providing a second article having at least a portion taken from the group consisting of columbium and columbium based alloys;
- (c) applying a first layer of ruthenium to said rhenium portion;
- (d) applying a second layer of ruthenium to said columbium portion;
- (e) placing said first ruthenium layer in contact with said second ruthenium layer and applying a compressive load thereto;
- (f) heating the assembly of step (e) until said rhenium diffuses with said first ruthenium layer, said first ruthenium layer diffuses with said second ruthenium layer, and said second ruthenium layer diffuses with said columbium;
- and
- (g) releasing said compressive load and cooling said assembly to ambient temperature.
A method for joining rhenium to columbium and columbium based alloys, comprising the following steps:
- (a) providing a first article having at least a portion of rhenium;
- (b) providing a second article having at least a portion taken from the group consisting of columbium and columbium based alloys;
- (c) applying a first layer of ruthenium to said rhenium portion;
- (d) applying a second layer of ruthenium to said columbium portion;
- and
- (e) bonding said first layer of ruthenium to said second layer of ruthenium .
Dependencies are inferred from the claim text.