| 摘要 |
1477521 Soldering B B C BROWN BOVERI and CO Ltd 27 Sept 1974 [1 Oct 1973] 42081/74 Heading B3R An assembly comprises an apertured plug 6 of pulverulent material soldered in a metallized aperture 2 in a ceramic body 1 and a metal member 5 soldered in the aperture in the plug. In an embodiment the plug 6 is formed from a metal powder coated with solder wettable metal or a ceramic powder coated with solder wettable metal and is located in the aperture 2 adjacent the metallized coating 4 of the aperture with the rectangular metal member 5 passing through the aperture in the plug and a layer of solder 7 on the surface of the plug. Alternatively the plug may be formed from a mixture of metal coated ceramic powder and solder powder or a mixture of metal coated metal powder and solder powder, thus avoiding the need for a solder layer 7. Heating causes the solder to melt and secure the plug to the aperture in the ceramic body and the member 5 in the aperture in the plug. The metallizing of the aperture in the ceramic body may be effected by sintering and the ceramic body and the ceramic powder for the plug may be purified aluminium oxide, magnesium oxide, beryllium oxide, zirconium oxide of a mixture of two or more of these oxides or a silicate ceramic. The metal for use as powder to form the plug may be tungsten, molybdenum, tantalum, chromium, nickel-iron alloys, nickelcobalt-iron alloys, nickel-chromium-iron alloys, molybdenum-cobalt-iron alloys and for metal coating the metal or ceramic powder gold, silver, nickel or copper may be electroplated. The solder may be silver alloy or cadmium-zinc alloy and uncoated metal powder may be employed for the plug. |
