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US 5,395,221 AGranted
Carbide or boride coated rotor for a positive displacement motor or pump
AssigneePraxair S.T. Technology, Inc.
InventorsRobert C. Tucker, Jr., Melvin D. Mendenhall, Madapusi K. Keshavan
Life of this patent
Estimating the term…
Abstract
A rotor for a positive displacement motor or pump in which the rotor is coated with a metal carbide and metal alloy coating or a metal boride and metal alloy coating to impart excellent wear-resistance and corrosion-resistance properties to the rotor when used in abrasive and/or corrosion resistance environmental.
Claims16
A positive displacement device comprising a spiral-helix screw shaped coated rotor disposed within a tubular stator lined with an elastomer inner surface;
- said coated rotor having a coating selected from the group consisting of a metal carbide-with a metal or metal alloy, a metal boride with a metal or metal alloy and mixtures thereof;
- and wherein the coating contains at least 65 weight per cent metal carbide for the metal carbide coating and 65 weight percent metal boride for the metal boride coating and said coating has a hardness of at least 900 HV.3.
Dependencies are inferred from the claim text.