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Comparative Impact Testing of Coatings: Analysis and Conclusions

A study comparing impact resistance of EHC, WC-Co, and WC-CoCr coatings through drop tests using various heights and materials. Results show variations in crack formation and visibility, with HVOF proving better in certain aspects than chrome. Further analysis required. Conclusions align with previous Gravelometry findings.

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Comparative Impact Testing of Coatings: Analysis and Conclusions

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  1. Whackometry data HCAT Program Review Long Beach April 2001

  2. Whackometer • Simulate FOD (hammers, rocks, F-8’s, etc.) • 1 lb (1 7/8” dia) 52100 ball • Drop down tube • Flattens rod surface about 0.003” • Cracks around periphery of flattened area • 100x optical examination 2 - 8’ FOD for thought

  3. Impact crater - 5’ drop onto WC-CoCr 0.010”

  4. Work done so far • Drop tests done on 0.005” and 0.010” EHC, WC-Co, WC-CoCr • Heights 24 - 103” • Damage small - need microscopy • Some multiple-drops, but confusing and no obvious additional damage • This is not same as done by Don Parker • dropped coating on 3lb fixture onto 1” ball • did drops near edge of coating • could not get visible failure otherwise (cf ice cracking) • counted drops to visible failure

  5. EHC - 0.010”, 102” drop Circumferential cracks Longitudinal cracks away from flat Longitudinal cracks away from flat

  6. WC-Co, 0.010”, 102” drop Circumferential cracks

  7. WC-CoCr, 0.010”, 102” drop Circumferential cracks

  8. Conclusions • Damage not greatly different • chrome shows both circumferential and longitudinal cracks (along rod), while HVOF only shows circumferential cracks • more cracks visible for EHC than for HVOF (but also depends on contrast, surface reflectivity, roughness, etc.) • Damage at lower drop height still to be analyzed • So far HVOF is better than or equal to chrome • This is same conclusion as for Gravelometry

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