Abstract

1. Application of an electrolytic copper coating causes additional damping of vibrations and reduces the energy of the sound emitted. Such coatings can be used for vibration-absorbing and sound-absorbing materials and structure. 2. As compared with gray cast irons, which have quite satisfactory acoustical characteristics, highstrength cast iron with an electrolytic copper coating has lower sound emission (115–116 dB) but higher strength characteristics.

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