Browse Prior Art Database

High Damping Materials

IP.com Disclosure Number: IPCOM000098162D
Original Publication Date: 1960-Apr-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 55K

Publishing Venue

IBM

Related People

Chapman, RM: AUTHOR [+3]

Abstract

It has been found that the spring contacts of a high speed wire contact relay exhibit a varying amount of in contact resistance following the making of the contact. This is due to vibration in the wire, which may be greatly reduced by using a metal of high damping capacity.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 2

High Damping Materials

It has been found that the spring contacts of a high speed wire contact relay exhibit a varying amount of in contact resistance following the making of the contact. This is due to vibration in the wire, which may be greatly reduced by using a metal of high damping capacity.

The frictional heat loss at the interface created by a dispersed phase in a metallic matrix is established as the prime factor in internal damping. This loss may be created by the introduction of a non-metallic particle that is unable to follow the displacement of the matrix, resulting in a phase shift, with an associated energy loss.

The presence of incoherent interfaces may be realized by the introduction of a dispersed, non-metallic phase with appreciably different modulus which may be accomplished by a number of methods which include: 1. Powder metallurgy.

2. Internal oxidation.

3. Precipitation of an insoluble phase in a melt.

Using the powder metallurgical method, silver-copper alloys are fabricated with inclusions of aluminum oxide, boron-nitride, and graphite. These exhibit higher damping qualities than the alloys alone. Silver magnesium nickel and beryllium copper alloys, internally oxidized to produce an immobile, lattice positioned oxide, display even higher damping qualities. The relative damping qualities of these alloys are in the drawing which is a plot of amplitude of vibration vs. cycles.

1

Page 2 of 2

2

[This page contains 3 pictures or other non-text o...