Self-centering braze assembly methods
First Claim
1. A method of brazing an assembly, comprising:
- providing a ceramic member with an end, which end is formed without machining and which ceramic member includes zirconia, wherein an external diameter of the ceramic member is constant along a length of the ceramic member;
providing a metal member including titanium and an exterior flange, the exterior flange having a uniform thickness along its length and configured to at least partially encompass the end of the ceramic member, wherein an internal diameter of the exterior flange is constant along a length of the exterior flange and wherein the internal diameter of the external flange is greater than the external diameter of the ceramic member and the thickness of the exterior flange is less than a thickness of an adjacent portion of the metal member;
placing braze material between the metal member and the ceramic member, the braze material including titanium and nickel;
compressing the metal member and the end of the ceramic member formed without machining together with the exterior flange at least partially encompassing the end of the ceramic member;
heating the braze material, the metal member, and the ceramic member in a vacuum until the braze material forms a liquidus; and
cooling the braze material, the metal member, and the ceramic member in the vacuum until the braze material forms a solidus.
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Accused Products
Abstract
Braze and electrode wire assemblies, e.g., used with an implantable microstimulator, include a wire welded in the through-hole of an electrode, which electrode is brazed to a ceramic case that is brazed to a metal ring that is welded to a metal can. The braze joints are step or similar joints that self-center the case, provide lateral support during braze assembly, and provide increased surface area that prevents braze material from exuding from the joints. The end of the ceramic case that is brazed to the metal ring need not be specially machined. The shell has a reference electrode on one end and an active electrode on the other, and is externally coated on selected areas with conductive and non-conductive materials.
35 Citations
20 Claims
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1. A method of brazing an assembly, comprising:
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providing a ceramic member with an end, which end is formed without machining and which ceramic member includes zirconia, wherein an external diameter of the ceramic member is constant along a length of the ceramic member; providing a metal member including titanium and an exterior flange, the exterior flange having a uniform thickness along its length and configured to at least partially encompass the end of the ceramic member, wherein an internal diameter of the exterior flange is constant along a length of the exterior flange and wherein the internal diameter of the external flange is greater than the external diameter of the ceramic member and the thickness of the exterior flange is less than a thickness of an adjacent portion of the metal member; placing braze material between the metal member and the ceramic member, the braze material including titanium and nickel; compressing the metal member and the end of the ceramic member formed without machining together with the exterior flange at least partially encompassing the end of the ceramic member; heating the braze material, the metal member, and the ceramic member in a vacuum until the braze material forms a liquidus; and cooling the braze material, the metal member, and the ceramic member in the vacuum until the braze material forms a solidus. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 19)
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10. A method of brazing an assembly, comprising:
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providing a first metal member including an exterior flange of the first metal member, the exterior flange including an inner surface and a uniform thickness along its length, wherein an internal diameter of the exterior flange is constant along a length of the exterior flange; providing a braze material including titanium and nickel; providing a ceramic member including a formed end, wherein an external diameter of the ceramic member is constant along a length of the ceramic member and wherein the internal diameter of the exterior flange is greater than the external diameter of the ceramic member and the thickness of the exterior flange is less than a thickness of an adjacent portion of the metal member; holding the formed end of the ceramic member adjacent the inner surface of the exterior flange of the first metal member so that the exterior flange at least partially encompasses the formed end of the ceramic member; and brazing the first metal member to the ceramic member with the braze material where the formed end of the ceramic member and the inner surface of the exterior flange of the first metal member are held together. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 20)
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Specification