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Title: Ceramic-metal composite article and joining method

Abstract

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 is described. 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,more » tantalum, tungsten, niobium, aluminum, cobalt, iron, or an alloy thereof. 4 figs.« less

Inventors:
; ; ; ;
Issue Date:
OSTI Identifier:
7207458
Patent Number(s):
5108025 A
Application Number:
PPN: US 7-703079
Assignee:
GTE Laboratories Inc., Waltham, MA (United States) PTO; EDB-94-082064
DOE Contract Number:  
AC05-84OR21400
Resource Type:
Patent
Resource Relation:
Patent File Date: 20 May 1991
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CERAMICS; BRAZING; COMPOSITE MATERIALS; FABRICATION; METALS; BRAZED JOINTS; BRAZING ALLOYS; LAYERS; ALLOYS; ELEMENTS; JOINING; JOINTS; MATERIALS; WELDED JOINTS; WELDING; 360601* - Other Materials- Preparation & Manufacture

Citation Formats

Kang, S., Selverian, J.H., Kim, H.J., Dunn, E.M., and Kim, K.S. Ceramic-metal composite article and joining method. United States: N. p., 1992. Web.
Kang, S., Selverian, J.H., Kim, H.J., Dunn, E.M., & Kim, K.S. Ceramic-metal composite article and joining method. United States.
Kang, S., Selverian, J.H., Kim, H.J., Dunn, E.M., and Kim, K.S. Tue . "Ceramic-metal composite article and joining method". United States.
@article{osti_7207458,
title = {Ceramic-metal composite article and joining method},
author = {Kang, S. and Selverian, J.H. and Kim, H.J. and Dunn, E.M. and Kim, K.S.},
abstractNote = {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 is described. 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. 4 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1992},
month = {4}
}