Perry Johnson Registrars, Inc | UKASANABITAR
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Custom Bearings for Dry Running High & Low Temp Applications



Carbon-graphite bearings and thrust washers are used in high temperature applications because oil/grease lubricated, metallic bearings can start to have problems at temperatures above about 350ºF (177ºC). Oil/grease lubricants can start to melt, volatilize or carbonize above this temperature. When this occurs, oil/grease-lubricated metallic bearings start to experience high friction, high wear, galling, vibration and even seizing.

At high temperatures, plastic and composite bearings are subject to other problems such as softening, melting, deformation and may extrude out of the bearing area all together.

Carbon graphite bearings are ideally suited for applications at elevated temperatures because they rely on graphite for their self-lubricating properties. These solid homogeneous bearing materials do not contain oil/grease lubricants and they do not rely on oil/grease for lubrication. Thus, bearings manufactured from these carbon graphite materials are not subject to the shortcomings associated with petroleum-based lubricants at elevated temperatures.

Because the carbon graphite matrix is very strong, it is not subject to the deformation, melting, or even softening that can occur with plastic bearings at these elevated temperatures.

Room Temperature or Cold Temperature Dry Running Applications

Carbon-graphite bearings are also used for dry running at room temperature or cold temperatures. This occurs in applications where oil/grease lubricated metal bearings can not be used because:
  1. Oil/grease lubricants volatilize in vacuum
  2. At low temperatures, oil/grease lubricants can congeal, freeze, or solidify
  3. In environments containing abrasive dust which is attracted by oil/grease lubricants to form a paste that increases bearing wear.
  4. In high load, slow roll, start-stop equipment where oil/grease lubricants can be squeezed out of the rubbing surface and cause metal-to-metal contact.
  5. Where the bearings need to conduct an electric current.
  6. In sanitary or clean conditions where oil/grease lubricants could leak out and destroy product such as food, textiles, pharmaceuticals, paper, etc.
Custom Bearing Design

Metcar Engineers will work with the customer to design the ideal bearing for your application. Design considerations include:
  • Bearing size (length, wall thickness, press-fit/shrink-fit interference, running clearance)
  • Bearing wear rate at required load, speed, and temperature
  • Optimum carbon-graphite material grade
  • Temperature limitation (oxidation)
  • Coefficient of Friction
  • Shaft material and surface finish
Metcar bearings for dry running can be provided to customer print or to customer approved dimensions and tolerances. Metcar bearings are also available shrink fitted into metal housings, or metal retaining rings.






Specifications

Material

Over 150 grades of our proprietary carbon/graphite METCAR material are available. Our engineers will work with you to select the optimum grade.

Temperature Rating (Air/Oxidizing Environments)

-400 to 1000 ºF

Temperature Rating (Neutral/Reducing Environments)

-400 to 5600 ºF

Pressure Rating

Up to 1000 psi

Applications (High Temperature)

Annealing Furnaces
Ash Precipitator

Car Bottom Ovens

Carpet Drying Ovens

Continuous Brazing Oven

Continuous Ceiling Tile Dryers

Continuous Food Baking Ovens

Continuous Gypsum Board Dryers

Continuous Welding Guides

Glass Lehrs

Heat Treating Furnaces

High Temperature Ball Valve Stem Bearings

High Temperature Butterfly Valve Stem Bearings

High Temperature Butterfly, Flapper & Ball Valves

High Temperature Conveyors

High Temperature Dampers

High Temperature Screw Conveyors & Stokers

Oven Doors & Louvers

Paint Drying Ovens

Plywood Dryers

Rubber Curing Ovens

Steel Cooling Beds

Turbine Safety Bearings

Veneer Dryers

Applications (Room/Low Temperature)

Air-lubricated Bearings Electrically Conductive Bearings
Bearings for Rotary Antennas

Dash Pot Dampers

Fly Ash Conveyors

Food, Paper & Textile Conveyors

Ice Conveyors

Oil-free Air Pumps

Rotary Vacuum Pumps

Turbine Safety Bearings

QA/QC Practices

All raw material physically tested prior to machining
DCC/CMM dimensional measurement/verification

Optical measurements

Compliances

All gaging and measurement equipment is calibrated and fully traceable to NIST Standards
ISO9001-2008


 MORE IMAGES 

·  4-Bolt Flange Bearing Assembly

·  Sleeve & Thrust Bearing


 DOWNLOADS 

Metcar Physical Properties
(PDF, 447KB)


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