| 摘要 |
1,014,206. Extruding; working at specified temperatures. PECHINEY COMPAGNIE DE PRODUITS CHIMIQUES ET ELECTROMETALLURGIQUES. July 2, 1964 [July 3, 1963], No. 27396/64. Headings B3P and B3V. In the extrusion of beryllium 12 the latter is provided with an external sheath 11 of soft steel electroplated with copper and an internal sheath 13 or a solid core. The internal sheath may be electroplated internally with copper. External sheath 11 has an end cap 11<SP>1</SP>. The beryllium workpiece 12 is machined from a bar drawn from a cast ingot or sintered billet, or it may be machined directly from a sintered billet. Composite billet 10 is heated in an argon atmosphere to 850-1000‹ C., placed over a slightly heated and lubricated mandrel in the container of an extrusion press heated to 450‹ C., and extruded into a tube. The sheaths and plating are later dissolved in a bath of nitric acid. In another embodiment, Fig. 2 (not shown), the composite billet has a solid core of cupro-nickel or manganese steel which is later removed by pulling. The final beryllium tube may have internal and external fins. |
