A METHOD OF MANUFACTURING OF A MECHANICAL FACE SEAL

摘要

A method of manufacturing of a mechanical end seal by powder metallurgy method is suggested. The seal is made of an iron based alloy substrate provided with annular groove. The groove is filled with a wear resistant material, which comprises at least one refractory metal carbide and a binder. The method comprising the following main sequence of steps: a) filling the annular groove formed in the substrate with a powdered mixture of refractory metal carbide and the binder, b) applying first external pressure onto said powdered mixture so as to produce a compact disposed within the annular groove, c) placing a powder of the binder onto the upper surface of the compact so as to form an upper layer of the powdered binder, d) applying second external pressure onto said upper layer so as to press thereof together with the compact and to produce an integral green body consisting of the upper layer portion and the bulk portion, e) heating said substrate in neutral or reducing atmosphere at a temperature sufficient to induce infiltration and diffusion of the binder from the upper layer portion.