| 摘要 |
1308021 Coating with ruthenium W C HERAEUS GmbH 4 May 1970 [6 May 1969] 21421/70 Heading C7F [Also in Division H1] A light-current switch contact comprises a backing of magnetic material such as an ironnickel alloy coated with ruthenium by precipitation from the gaseous phase. The ruthenium is precipitated to a thickness of 1 to 30Á in a vacuum of less than 10<SP>-1</SP> mm Hg and preferably less than 10<SP>-4</SP> mm Hg. |
