High temperature refractory joining paste
First Claim
1. A method of joining refractory metal components comprising the steps of:
- (a) providing a first refractory metal component and a second refractory metal component, said first and second refractory metal components having corresponding surfaces in need of joining;
(b) providing a joining paste mixture comprising a refractory material present in an amount between 95.0 wt. % and 99.8 wt. % and a material having a lower melting point than the refractory material present in an amount between 0.2 wt. % and 5.0 wt. % based on a total weight of said refractory material and the material having a lower melting point than the refractory material, and a binder mixture;
(c) applying said paste mixture to the surface in need of joining on said first refractory metal component and to the surface in need of joining on said second refractory metal component;
(d) contacting said first refractory metal component to said second refractory metal component at the surfaces in need of joining to form a joined structure;
(e) heating the joined structure to a eutectic point of said paste mixture; and
(f) forming a substantially refractory joint between said first and second refractory metal components.
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Accused Products
Abstract
A method of and novel composition for transient liquid phase bonding of refractory metal structures is described herein. Preferably, the composition comprises a first component substantially similar to the composition of the refractory metal structure, and a second component having a lower melting temperature than the first component comprising a metallic constituent selected from the group consisting of iron, nickel and cobalt. The second component acts as a melting point depressant to temporarily lower the melting point of the first component so that the join can be accomplished without melting the structure itself. Upon applying the composition to the surfaces of refractory metal structures in need of joining, the assembly is heated to a eutectic point defined as the lowest melting point of the composition. A localized liquid region is formed at the interface of the two structures which solidifies when the second component diffuses into the structures such that the region becomes increasingly refractory thereby solidifying into a substantially refractory joint.
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Citations
33 Claims
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1. A method of joining refractory metal components comprising the steps of:
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(a) providing a first refractory metal component and a second refractory metal component, said first and second refractory metal components having corresponding surfaces in need of joining;
(b) providing a joining paste mixture comprising a refractory material present in an amount between 95.0 wt. % and 99.8 wt. % and a material having a lower melting point than the refractory material present in an amount between 0.2 wt. % and 5.0 wt. % based on a total weight of said refractory material and the material having a lower melting point than the refractory material, and a binder mixture;
(c) applying said paste mixture to the surface in need of joining on said first refractory metal component and to the surface in need of joining on said second refractory metal component;
(d) contacting said first refractory metal component to said second refractory metal component at the surfaces in need of joining to form a joined structure;
(e) heating the joined structure to a eutectic point of said paste mixture; and
(f) forming a substantially refractory joint between said first and second refractory metal components. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of repairing molybdenum sintering furniture comprising the steps of:
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(a) providing a first piece of sintering furniture and a second piece of sintering furniture having corresponding surfaces in need of joining;
(b) providing a metal paste mixture comprising an organic binder mixture, and between 80.0 wt. % and 85.0 wt. % molybdenum and between 0.5 wt. % and 5 wt. % iron based on a total weight of said paste mixture;
(c) applying a layer of said paste mixture to the surfaces in need of joining on said first and second pieces of said sintering furniture;
(d) contacting said pieces to be joined by its surfaces having said paste mixture to form a joined piece;
(e) heating the joined piece; and
(f) forming a substantially refractory joint between said first and second pieces of sintering furniture. - View Dependent Claims (14, 15, 16, 17)
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18. A method of repairing tungsten sintering furniture comprising the steps of:
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(a) providing a first piece of sintering furniture and a second piece of sintering furniture having corresponding surfaces in need of joining;
(b) providing a metal paste mixture comprising an organic binder mixture, and between 95.0 wt. % and 99.8 wt. % tungsten and between 0.2 wt. % and 5.0 wt. % of a material selected from the group consisting of iron, nickel and cobalt based on a total weight of the tungsten and the material selected from the group consisting of iron, nickel and cobalt;
(c) applying a layer of said paste mixture to the surfaces in need of joining on said first and second pieces of said sintering furniture;
(d) contacting said pieces to be joined at its surfaces having said paste mixture to form a joined piece;
(e) heating the joined piece; and
(f) forming a substantially refractory joint between said first and second pieces of sintering furniture. - View Dependent Claims (19, 20, 21, 22)
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23. A method of joining refractory metal components comprising the steps of:
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(a) providing a first refractory metal component and a second refractory metal component, said first and second refractory metal components having corresponding surfaces in need of joining;
(b) providing a joining paste mixture comprising a refractory material, a material having a lower melting point than the refractory material selected from the group consisting of iron, nickel and cobalt present in an amount between 0.2 wt. % and 5.0 wt. % based on a total weight of said refractory material and the material having a lower melting point than the refractory material, and a binder mixture;
(c) applying said paste mixture to the surface in need of joining on said first refractory metal component and to the surface in need of joining on said second refractory metal component;
(d) contacting said first refractory metal component to said second refractory metal component at the surfaces in need of joining to form a joined structure;
(e) heating the joined structure to a eutectic point of said paste mixture; and
(f) forming a substantially refractory joint between said first and second refractory metal components. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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Specification