Method for applying wear resistant coating to mechanical face seal

摘要

Mechanical face seal rings having a metallurgically bonded wear-resistant coating on the wear surfaces thereof and methods for forming such coated components is taught herein. The face seal rings, which can be formed of a relatively inexpensive base metal or alloy, have a hard metal alloy slurry disposed on the wear surfaces and then fused to form a metallurgical bond with the iron-based alloy. The wear-resistant coating comprises a fused, metal alloy comprising at least 60% iron, cobalt, nickel, or alloys thereof.

主权项

1. A method for producing a wear-resistant mechanical face seal ring, comprising:
obtaining an uncoated metal ring, comprising:
a radially inner surface;a radially outer surface forming an axially inner lip, an axially outer lip, and a groove therebetween;a coatable surface extending between an edge of the axially inner lip and the radially inner surface; coating an exposed area of the coatable surface with a slurry comprising a fusible, hard metal alloy with at least 60% by weight of iron, cobalt, nickel, or alloys thereof in the form of a finely divided powder, polyvinyl alcohol, a suspension agent, and a deflocculant; and forming a metallurgical bond between the exposed area and the coating slurry to form a metallurgically bonded wear-resistant coating on at least a portion of said coatable surface, wherein the wear-resistant coating comprises a fused hard metal alloy comprising at least 60% by weight iron, cobalt, nickel or alloys thereof, wherein the wear-resistant coating has a Vickers hardness greater than 950 HV, and wherein the wear-resistant coating excludes carbides.