Glaze-forming solid-film
lubricant technology was originally developed by the National Aeronautics and
Space Administration (NASA) for the space shuttle program as a means of
providing a journal bearing lubricant that works in an oxygenated atmosphere,
in a vacuum, and functions at temperatures encountered during re-entry. The
lubricants developed contain lubricative oxide material (LOM) particles that
are self-lubricating in any atmosphere, as well as in a vacuum and at high
environmental and frictional temperatures.
The novel aspect of this
technology is that the lubricants also contain glaze formers that help to bond
the solid film to the substrate and create a new lubricated wear surface on top
of the substrate. Many areas in industry can utilize this technology to solve difficult
high-temperature lubrication and wear problems.
Glaze-forming solid-film
lubricants create a new surface, approximately 30 microns (0.001-inch) thick,
on the bearing surfaces and fill in small surface irregularities. The new
surfaces are formed on both contacting surfaces of the bearing (for example,
shaft outer diameter and journal inner diameter). The new surface is smooth,
nonmetallic, possesses a low coefficient of friction and provides corrosion
protection to the substrate. During motion between the shaft and journal, the
glaze wears away, but the metal surfaces remain unaffected. The glaze is
periodically replenished to maintain lubrication and prevent metal-to-metal
contact.
At the microscopic
level, all machined surfaces consist of microscopic, mountain-like asperities,
plateaus and valleys. The formation of a solid-film lubricant glaze takes place
at the microscopic level as the asperities or plateaus of the opposing surfaces
collide and slide over one another.
When the surfaces are
coated with the CerOxi film compound, a thin film of carrier fluid and
nano-size solid lubricant particles coat the asperities, plateaus and valleys
of the mating surfaces. As these surfaces come together, the carrier fluid
keeps the surfaces apart through elastohydrodynamic fluid pressure generated
between the mating surfaces.
When asperities and
plateaus collide, frictional temperatures above 315°C (600°F) and Hertzian
loading more than 200,000 psi occur instantaneously at the microscopic contact
areas of the collisions. At 315°C (600°F), the carrier fluid completely
evaporates leaving no residue. A soft, dry mixture of nanoparticles (powder)
now coats the mating surfaces. (Figure 2).
The contact pressure and
frictional temperature resulting from asperity and plateau collisions melt the
powder nano particles, forming a thermo-chemical liquid that lubricates the
mating surfaces (as long as the frictional temperature remains high). When the
contact surface cools, the liquid solidifies into a solid oxidation-resistant glaze
bonded to the substrate.
Cer-Oxi FilmTM
high-temperature compound is a paste-like compound composed of a synthetic base
oil, LOMs, glaze formers and proprietary materials. NLGI #00, #0 and #1
consistencies are pumpable through central distribution systems or can be
dispensed from a grease gun for reapplication, depending upon the configuration
of the specific application. These compounds are used to lubricate plain
journal bearings and sliding surfaces. They are not suitable for antifriction
element bearings. So if you are looking for metal coating and lubricators visit
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