Pretreatment processing of metal-matrix carbide power for...

Details Pretreatment processing of metal-matrix carbide power for... Pretreatment processing of metal-matrix carbide power for...

2006-04-11

2006-04-11

Kerns, Kevin (Department: 1725)

Metal founding

Process

Shaping liquid metal against a forming surface

C164S066100, C164S068100, C164S055100

Reexamination Certificate

active

07025112

ABSTRACT:
A metal-matrix material in the form of a carbide powder together with a sodium fluoride flux is deposited as a charge within a crucible for induction heating thereof to a flux melting temperature to thereby initiate pretreatment. The molten flux is spread over and covers powder particles of the metal-matrix carbide throughout, in response to stirring by rotation of an agitator during said flux melt heating within the crucible. The charge may be covered within the crucible by an air-purging blanket of argon gas during said heating. The powder fluxed charge is then cooled within the crucible before removal therefrom and sealingly packaged within aluminum soda cans or foil wrappings for future use storage. Such packaged charges are transferred from storage and introduced into a casting mold for enhanced centrifugal cast molding of metallurgical products, such as a metallic ring having an outer carbide bronze surface.

REFERENCES:
patent: 3372066 (1968-03-01), Quaas
patent: 5508116 (1996-04-01), Barrett
patent: 5776225 (1998-07-01), Megy
patent: 6129134 (2000-10-01), Divecha
patent: 6129135 (2000-10-01), Divecha et al.

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