Fields of Application
Many uses of Metallized Carbon Corporation materials arise from lubrication problems that cannot be solved with conventional oil-grease lubrication. The following applications, where oil-grease lubricants have problems, will illustrate the conditions where oil-free; self-lubricating Metcar materials are successfully utilized.
- At high temperatures, from 350 to 1000°F. in oxidizing atmospheres, and from 350 to 6000°F. In non-oxidizing atmospheres, (where oil-grease lubricants volatilize or carbonize), Metcar is employed in ovens, dryers, hot conveyors, kiln cars, ventilation dampers, steam turbines, refuse burners, blowers, gas turbine engines; paint dryers, and other high temperature equipment. Unlike plastic materials, Metcar material will not melt or extrude out under pressure
- In Submerged applications, (where oil-grease lubricants would be washed away), Metcar is employed in pumps, meters, mixers, valves, textile finishing tanks, etc. Because Metcar has little or no atomic attraction to metals, the hydrodynamic film that occurs with low viscosity liquids (such as water, gasoline, hot oils, molten materials, and strong chemical solutions) provides excellent lubrication for Metcar materials.)
- At low temperatures, from -30 to -450°F. (Where oil grease lubricants congeal, solidify or become sluggish) Metcar is used in cryogenic pumps, ice conveyors, radar and other equipment which must function in very cold weather.
- In Sanitary or clean conditions, as in the food, pharmaceutical, textile, paper, canning, and packaging industries, (where oil-grease lubricants contaminate products) Metcar is extensively employed in mixers, conveyors, agitators, winders, oil-free compressors, and other equipment. The FDA has approved several Metcar Grades as "Generally Recognized as Safe" (GRAS) for food contact applications.
- In vacuum, (where oil-grease lubricants volatilize) Metcar is used in vacuum pumps, and bearings for high altitude and deep space mechanisms. Special Metcar Grades have been developed for running in dry gases (due point less the -30°F) such as dry nitrogen.
- In corrosive chemicals (where oil-grease lubricants are dissolved and metal parts are corroded) Metcar is employed in chemical pumps, mixers, meters, valves, handling acids, alkalis, solvent, and other corrosive chemicals, Metcar can handle most chemicals without swelling, or warping. Metcar corrosion resistant grades can handle all chemicals except for a few extremely strong oxidizing agents such as hot, concentrated, nitric acid.
- In seal applications (where oil-grease lubricants would cause too much separation of the rubbing surfaces) Metcar is used for mechanical seal primary rings and circumferential seals rings where the rubbing surfaces are only separated by a few microns to prevent the leakage of high pressure liquids and gasses. Metcar seals are used extensively in pumps, mixers, power turbines, aircraft engines, and high speed gear boxes. Several Metcar Grades are specifically designed to provide a high modulus of elasticity; which reduces deformation or "coning" in high-pressure mechanical seal primary rings.
- In equipment where relatively constant friction over varying environmental conditions is required, (where the varying meniscus drag of oil-grease lubricants would be unacceptable) as in delicate instruments and dashpot damper assemblies, Metcar is successfully employed.
- In environments containing abrasive dust (which is attracted by oil-grease lubricants to form a paste that increases bearing and shaft wear), as on dust conveyors and ash conveyors, oil-free Metcar is used to great advantage.
- In high load, slow roll, start-stop or reciprocating conditions (where oil-grease lubricants can be squeezed out of the rubbing surface and cause metal to metal seizing and galling), Metcar materials coat the shaft or counter face with a graphite film that does not rely on continuous rotating motion to provide lubrication
Typical Components Made by Metcar Materials:
|Ball Valve Seats|
Centrifugal Pump Case Wear Rings
Mechanical Seal Primary Rings
Piston Guide Rings
Reciprocating Shaft Seal Rings
Rotary Pressure Joint Rings
Rotary Pump Vanes or Blades
Radial Shaft Seal Rings
Slides or Runners
Specialty, Precious Metal Contacts and Brushes
Valve Stem Guides