Читать книгу Material science. Жаратылыстану факультеттерінің студенттеріне арналған әдістемелік құрал - Шолпан Гумарова - Страница 6

Gold. A yellow metal of very high plasticity, with a tensile strength of 150 MPa and elongation at rupture of 40 %. Its uses in electrical engineering include corrosion-resistant contact coats, photocell electrodes, vacuum-deposited thin-film microcircuits, etc.

Silver, A white, lustrous metal, resistant to oxidation at normal temperature. Of all the metals, silver has the lowest resistivity at normal temperature. The tensile strength of silver wire is about 200MPa, and elongation approximately 50 %. This wire is used for contacts intended to operate at low currents.

Silver is also employed for direct deposition of coats by fusion or vacuum evaporation on dielectrics, which serves as silver plates in ceramic and mica capacitors.

The metal presents a drawback in that migrates from the surface of a dielectric into its body at high humidity and also at elevated temperatures of the surrounding medium. Silver is inferior to other noble metals in chemical resistance.