GB778368A - Improvements in and relating to hot rolling and sintering of metal powder - Google Patents

Abstract

778,368. Making metal strip, bars, &c., powder metallurgy. MANNESMANN AKT.- GES., and CHEMETALS CORPORATION. April 14, 1955 [April 15, 1954], No. 10778/55. Classes 83 (2) and 83 (4). Rolling; working at specified temperatures. In a method of forming rod, strip, &c., from precipitated metal powder, a self-sustaining bar formed by partially sintering the powder is compressed by rolling, in two stages to the required density. In an example, copper powder 3 formed by a precipitation method from a salt solution is fed by a continuous belt 4 through sintering furnaces 8, 10 which partially sinter the powder before it is compressed by roll 11 to complete the consolidation. The wet powder fed from a centrifuge 1 over a drier 2 is smoothed to uniform thickness by rolls 7 and heated to 300-600‹ C. in a furnace 8. The bar then passes through rolls 9 where the first consolidation takes place. The bar is then heated to 700-1050‹ C. in a second furnace 10 from which it passes directly into the rolls 11. The furnaces 8 and 10 may be totally enclosed by a jacket 17 containing an inert atmosphere or the furnaces may be interconnected to form a single furnace and the rolls 9 placed inside. The finished bar may leave the rolls 11 through a cooling chamber 12 or may be fed through a furnace at 800-1050‹ C. and rolled to effect further consolidation,