HVOF Wear

HVOF Wear

March 12, 1991

Cross-Cylinder Wear Test

Sample coatings were applied to bars of 4140 steel as follows:

  • Nitrided – to approximately .007 – .010-inch depth
  • Chrome plated – .002 – .003-inch depth
  • Plasma spray – tungsten carbide powder
  • JK 558 , Tribaloy T-800
  • JK 591, Nistelle C

The cross-cylinder test uses a 1/2-inch diameter 6 percent cobalt tungsten carbide cutter blank rotating at 1,760RPM with a 15lb. load and a nitrogen wipe for a one-hour period. This test was performed by an independent laboratory.

RESULTS:

Material Volume Loss 10-6 Cubic Inches
1. Nitrided 44
2. Chrome plated 100
3. Plasma spray – tungsten carbide/cobalt no measurable wear
4. JK 558, Tribaloy T 800 powder 123
5. JK 591, Nistelle C powder 355
6. JK 112, tungsten carbide/cobalt powder no measurable wear