Carbide or boride coated rotor for a positive displacement...

Details Carbide or boride coated rotor for a positive displacement... Carbide or boride coated rotor for a positive displacement...

F - Mech Eng,Light,Heat,Weapons

04

B

F04B 15/00 (2006.01) F01C 21/08 (2006.01)

Patent

CA 2119322

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.

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