Sintered bushings and methods for making the same
AssigneeGarrett Transportation I Inc.
InventorsPetr Balon, Philippe Renaud, Marek Slouka
Life of this patent
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Abstract
A bushing includes a first wall section disposed about a channel. The first wall section is formed of a first sintered powdered metal alloy having a first mean sintering temperature in powdered form. A second wall section is disposed adjacent and affixed to the first wall section about the channel. The second wall section is formed of a second sintered powdered metal alloy having a second mean sintering temperature in powdered form that is different than the first mean sintering temperature. The difference between the first and second mean sintering temperatures is about 150° C. or less.
Claims20
A bushing comprising:
- a first wall section disposed about a channel, wherein the first wall section is formed of a first sintered powdered metal alloy having a first mean sintering temperature in powdered form;
- and
- a second wall section disposed adjacent and affixed to the first wall section about the channel, wherein the second wall section is formed of a second sintered powdered metal alloy having a second mean sintering temperature in powdered form that is different than the first mean sintering temperature, wherein a difference between the first and second mean sintering temperatures is about 150° C. or less.
A bushing comprising:
- an interior wall section disposed about a channel, wherein the interior wall section is formed of a sintered powdered cobalt-based alloy having a first mean sintering temperature in powdered form of from about 950° C. to about 1250° C.;
- and
- an exterior wall section disposed about and affixed to the interior wall section, wherein the exterior wall section is formed of a sintered powdered stainless steel alloy having a second mean sintering temperature in powdered form of from about 1050° C. to about 1350° C.
A method for making a bushing, the method comprising:
- providing or obtaining a first powdered metal alloy and a second powdered metal alloy that is different than the first powdered metal alloy, wherein the first powdered metal alloy has a first mean sintering temperature and the second powdered metal alloy has a second mean sintering temperature that is different than the first mean sintering temperature, wherein a difference between the first and second mean sintering temperatures is about 150° C. or less;
- mixing a first binder with the first powdered metal alloy to form a first mixture;
- mixing a second binder with the second powdered metal alloy to form a second mixture;
- performing a bi-metal injection molding process to form a green component in a shape of the bushing, wherein the green component comprises:
- a first green wall section disposed about a channel and formed of the first mixture;
- and
- a second green wall section disposed adjacent to the first green wall section about the channel and formed of the second mixture;
- debinding the green component to form a brown component in the shape of the bushing having a porous structure;
- and
- sintering the brown component at a sintering temperature effective to densify and sinter the brown component including the first and second powdered metal alloys to form the bushing.
Dependencies are inferred from the claim text.