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Extreme Coatings

Call: 888-367-2569

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Engineered Surfaces to Extend Service Life and Performance

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    Reduce Replacement Costs for Mud Rotors
    HVOF CPR delivers more abrasion and corrosion resistance than hard chrome plating (HCP) - even in high chloride environments
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    Twin Feedscrews
    Our high percentage carbide layer can provide from two to four times more wear life depending on fill loading.
    Plastic Injection Molding
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    Our coatings are perfect for injection molders and extruders when processing fiberglass, calcium carbonate, titanium dioxide and metals, ceramic or other highly abrasive fillers.
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    Continuous Mixing Rotors
    Our C1000 tungsten carbide has been used as chrome replacement in aggressive applications. C1000 doubles the working life of rotors compared to hard chrome plating.
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You are here: Home / Technical Resources / Test Results / Adhesive Wear Test ASTM G77

Adhesive Wear Test ASTM G77

The ASTM G77 test determines the resistance of materials to metal-to-metal sliding wear. Utilizing a block-on-ring testing machine to rank pairs of materials according to their sliding-wear compatibility characteristics, this test replicates “adhesive, metal-to-metal” wear. Results are reported as volume loss in cubic millimeters for both the block and the ring. Materials of higher wear resistance have lower volume loss. Friction coefficents may also be established during this test.

Test Conditions

Tested on 3000 meter slide length. Fixed load and stepped load to COF seizure. Mineral oil lubricant used, 30,000 revolutions, 300 RPM and 300 POUNDS FORCE

Adhesive Wear

Adhesive wear occurs when surface asperities on two materials contact under load, which converts relatively low force into super high pressure. Friction results between two points, creating micro-welds (adhesion) that subsequently fracture and cause undesirable fragments that impart abrasive wear to the two mating surfaces.

Stationary BlockBlock LossRing LossRotating Ring
BiMetallic (FeCr) 0.1370 0.2200 C1000
BiMetallic (FeCr) 0.1624 0.5158 Moly
BiMetallic (FeCr) 0.1990 1.4000 C4000
BiMetallic (FeCr) 0.4000 3.7000 Stellite
BiMetallic (FeCr) 0.1995 4.7000 Colmony 56
Carbide (WC) 0.0207 0.0641 C1000
Carbide (WC) 0.0249 0.2000 C4000
Carbide (WC) 0.1127 0.2966 CPM-9V
Nitrided Steel 0.045 0.0836 C1000
Nitrided Steel 0.605 1.192 Nitrided Steel

Note: This test was mainly done to compare a misconception that a hard coated feedscrew (Ring) in contact with a softer barrel liner (Block) will cause premature wear to the barrel. This test clearly shows that our tungsten coatings do not wear a barrel faster than any other alloys commonly used for wear resistance and actually can increase the barrel life.

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Extreme Coatings

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  • Home
  • About Us
    • Shows and Events
    • News
  • Our Processes
    • High Velocity Thermal Spray
    • The Process
    • Encapsulation Protection
      • Full Encapsulation of Feedscrews
      • Partial Encapsulation of Feedscrews
    • Chrome Plating Replacement
      • Feedscrews, Mixing Rotors, etc.
      • Mud Rotors and Downhole Tools
  • Applications
    • Plastic & Rubber Industries
      • Feedscrews
      • Parallel Twin Feedscrews
      • Co-Rotating Twin Feedscrews
      • Ultrasonic Welding Horns
      • Cushion Master
      • Continuous Mixing Rotors
      • Mixer Bodies
      • Extrusion Dies, Die Plates, Sheet Dies
      • Granulator Knife Blades
    • Oil & Gas Industry
      • Downhole Mud Rotors
      • Mandrels
    • Motorsports Industry
    • Marine Anti-Fouling
  • Technical Resources
    • Coating Formulas
      • Tungsten/Chromium Carbide
      • NiBoride
      • Other
    • Test Results
      • Abrasive Wear Test ASTM G65
      • Adhesive Wear Test ASTM G77
    • Case Studies
    • FAQs
    • Company Literature
    • ROI
    • Videos
  • How to Buy
    • Our Distributors
    • Purchase Encouragement Program (PEP)
    • Warranty
  • Contact Us
    • Application Profile Form
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