Ceramic-metal composite article and joining method

Patent · Tue Dec 31 23:00:00 EST 1991

OSTI ID:868257

Kang, Shinhoo ^[1]; Selverian, John H ^[2]; Kim, Hans J ^[3]; Dunn, Edmund M ^[4]; Kim, Kyung S ^[5]

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1. Wayland, MA
2. Burlington, MA
3. Concord, MA
4. Lexington, MA
5. Barrington, RI

A ceramic-metal article including a ceramic rod, a metal rod, and a braze joining the ceramic and metal rods at a braze area of a coaxial bore in the metal rod. The bore gradually decreases in diameter, having an inward seat area sized for close sliding fit about the ceramic, a larger brazing area near the joint end, and a void area intermediate the braze and seat areas. The ceramic is seated without brazing in the bore seat area. The side wall between the brazing area and the metal outer surface is about 0.030-0.080 inch. The braze includes an inner braze layer, an outer braze layer, and an interlayer about 0.030-0.090 inch thick. A shoulder between the brazing and void areas supports the interlayer during bonding while preventing bonding between the void area and the ceramic member, leaving a void space between the void area and the ceramic member. A venting orifice extends generally radially through the metal member from the outer surface to the void space. The braze layers are palladium, platinum, gold, silver, copper, nickel, indium, chromium, molybdenum, niobium, iron, aluminum, or alloys thereof. Preferred is a gold-palladium-nickel brazing alloy. The interlayer is nickel, molybdenum, copper, tantalum, tungsten, niobium, aluminum, cobalt, iron, or an alloy thereof.

• Research Organization: LOCKHEED MARTIN ENRGY SYST INC
• DOE Contract Number: AC05-84OR21400
• Assignee: GTE Laboratories Incorporated (Waltham, MA)
• Patent Number(s): US 5108025
• OSTI ID: 868257
• Country of Publication: United States
• Language: English

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