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The knives on this two-ton-per-minute potato harvester are normally completely worn out at the end of a season—largely due to the destruction of the leading edges.

We coated the leading edges on all the knives with 60% plasma tungsten carbide. We then chromed half of them and coated the other half with 88% tungsten carbide RocketCoat. The plasma carbide took all the major impact wear and allowed even the hard chrome to finish the season with little appreciable wear. The RocketCoat carbide did not even polish in service.