| 摘要 |
<p>637,736. Dry contact rectifiers. NAAMLOOZE VENNOOTSCHAP PHILIPS' GLOEILAMPENFABRIEKEN. April 15, 1947, No. 10007. Convention date, Aug. 8, 1944. [Class 37] A method of applying a blocking layer 4, 5, e.g. of selenium or sulphur to an electrode for a rectifier, comprises disintegrating the material to be applied as blocking layer by ion bombardment. An aluminium carrier plate 1 is roughened and coated with a layer of carbon 2, and then selenium 3, to which has been added a volatile halide, e.g. tin chloride, is applied to the plate 1. The selenium surface 3 is smoothed by a press, the plate of which is previously coated with a resin-forming liquid, e.g. chinoline. The plate 1 is then heated at about 200‹ C. A layer 4 of a resin-forming liquid, e.g. triethanolamine, is sprayed either before or during the heating on the selenium, after which the plate 1 is placed between two electrodes in a vessel containing air, with the selenium layer 3 facing the cathode which is also of selenium. The pressure in the vessel is reduced to about 100 mm. of Hg and several kilovolts applied across the electrodes, whereby the selenium cathode is subjected to ion bombardment. The cathode disintegrates and selenium 5 is deposited on the plate 1. A low melting-point alloy forms the counter electrode.</p> |
