| 摘要 |
496,412. Metal articles for use with molten glass. NAAMLOOZE VENNOOTSCHAP MAATSCHAPPIJ TOT BEHEER EN EXPLOITATIE VAN OCTROOIEN. June 28, 1937, No. 17934. Convention date, June 27, 1936. [Class 56] [Also in Group II] Parts, such as the delivery nozzle lining shown in Fig. 2, intended for contact with molten glass, comprise a body 12 of platinum with an integral rhodium or rhodium-containing coating 13 on the surface not in contact with the glass ; volatilization of the platinum, which does not occur appreciably at the surface covered by the glass, is thereby prevented also at the surfaces exposed to air, or in contact with refractory material 10. The coating may consist of rhodium applied by electrodeposition. The article may be subsequently heated to 1400 or 1500 degrees Centigrade so that the metals diffuse and form an alloy at the interface. Alternatively, a platinum-rhodium alloy coating may be applied by rolling, drawing, or swaging an ingot of the alloy to the desired form, nesting it with a similarly-formed platinum body, and heating them to welding- point. Glass-contacting articles, such as the crucible shown in Fig. 3, which are intermittently exposed to the air whilst at high temperature, are similarly coated on all surfaces of the platinum body 14 with a rhodium or rhodium-containing casing 15. |
