Silver Metcar is a silver impregnated, carbon-graphite material useful for electrical
applications that require low resistance, low voltage drop and low electrical
noise. The carbon-graphite in Silver Metcar provides self-lubricating
properties and the pure silver provides high and constant electrical
conductivity. The material is corrosion resistant, dimensionally stable and has
a heavy overload capacity. Additives to the carbon-graphite base material
improve its self-lubricating properties in the dry atmospheres that occur at
high altitude and in space. Silver Metcar cannot melt or weld to another metal
surface because the carbon-graphite base material will not melt. It can be
silver plated so that it can be soldered to metal parts such as leaf springs or
conventional brush holders.
To make the Silver Metcar materials, solid
carbon-graphite base materials, in rings or blocks, are submerged in pure,
molten silver and the silver is forced into the porosity of the carbon-graphite
material using extremely high gas pressure. Most of the Silver Metcar grades
contain approximately fifty percent silver by weight. X-ray inspection is used
to ensure that each Silver Metcar part is uniformly impregnated with silver.
Ships, aircraft, rail systems and other
applications that require low electronic interference use the Silver Metcar
material for dc motor brushes, non-welding electrical contacts and rotary slip
ring brushes or contacts. Applications include air traffic control radars,
telecommunications systems and satellite communications systems.
Researchers at the University of Maryland have achieved a first in lithium-ion battery science: the development of a successful lithium-based battery using one material for all three core components of a battery -- anode, cathode, and electrolyte.
The online Bar Steel Fatigue Database for automotive design engineers has been updated for the fifth time and now contains 134 iterations, or grade/process combinations. It provides better predictability for designing parts with long-term reliability and durability.
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