| 摘要 |
1,007,329. Zone-melting. PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd. Dec. 12, 1962 [Dec. 15, 1961], No. 46939/62. Heading B1S. A rod 3 of material in a vessel 2 is zonemelted in a tube 4 by passage of the tube through a graphite heating member which comprises two rings 5 closely surrounding tube 4 and connected by a thin ring 6 spaced from tube 4, the graphite member being contained in a stationary tube 8 which has an inert gas inlet 16 and is surrounded by two ovens 11 and 12 and an induction coil 7 for heating the centre of ring 6. Tube 4 has an inert gas outlet 17 and a sleeve 13 which is displaced together with tube 4 between bearing and driving rollers 14 and 15 respectively. Tube 4 passes into tube 8 through a sealing ring 10 of P.T.F.E. Vessel 2 may be contained in a sealed ampoule 1. Gallium arsenide may be zone-melted in the presence of arsenic. |
