Gte Laboratories Incorporated

Other

Technitrol, Inc.

Shinhoo Kang

Edmund M Dunn

George C Wei

Charles Brecher

Philip C Wingert

Han J Kim

Hans J Kim

Kyung S Kim

John H Selverian

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.

Ceramic-metal composite article and joining method

An erosion resistant electrical contact material and a method of making the material is described. The material comprises from about 10 to about 20 volume percent of SnO.sub.2, from about 0.45 to about 1.2 volume percent of an oxide selected from the group consisting of TiO.sub.2, CeO.sub.2, ZrO.sub.2, HfO.sub.2, and combinations thereof and the balance being substantially silver.

Erosion resistant Ag-SnO.sub.2 electrical contact material

A new and improved method of bonding a bonded ceramic-metal article is described. The ceramic-metal article comprises a ceramic article, such as a lanthana-strengthened yttria article, bonded to a metal article, such as niobium, by a layer of a brazing material, such as a brazing alloy consisting essentially of 63% by weight silver, 35.25% by weight copper, and 1.75% by weight titanium to form a bonded ceramic-metal article. The method of bonding the ceramic article to the metal article comprises placing the brazing alloy between the lanthana-strengthened yttria article and the niobium article and heating the layered structure in vacuum at about 50 degrees centigrade above the liquids temperature of the brazing alloy for a period of about 5 minutes.

Method of bonding a ceramic article to a metal article

A new and improved method of brazing a ceramic-metal article is described. The ceramic-metal article comprises a ceramic article, such as a lanthana-strengthened yttria article, bonded to a metal article, such as niobium, by a layer of a brazing material, such as brazing alloy consisting essentially of 72% by weight silver, 28% by weight copper to form a joined ceramic-metal article. The method of brazing the ceramic article comprises coating a surface of the lanthana-strengthened yttria article with a group IVB metal, such as titanium, hafnium, and zirconium then placing a brazing alloy, such as a brazing alloy consisting essentially of 72% by weight silver and 28% by weight copper or a brazing alloy consisting essentially of 82% by weight gold and 18% by weight nickel, between the coated lanthana-strengthened yttria article and the niobium article and heating the layered structure in vacuum at about 50 degrees centrigrade above the liquidus temperature of the brazing alloy for a period of about 5 minutes.

Method of brazing a ceramic article to a metal article

A material for electrical contact use has the following composition: 6 to 18 percent tin oxide, 0.25 to 1% germanium oxide, 0.2 to 2% indium oxide, balance silver, all percentages by weight. The material exhibits superior erosion characterstics.

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Wayland, MA, United States of America

Shinhoo Kang