Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Heat and pressure simultaneously to effect sintering
Patent
1982-04-28
1984-01-31
Hunt, Brooks H.
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Heat and pressure simultaneously to effect sintering
419 49, 419 56, 425 78, 425405R, 425405H, B22F 314
Patent
active
044289065
ABSTRACT:
A quantity of material (10), which is at less than a predetermined density, is disposed within a sealed container (12) which is, in turn, encapsulated in a pressure-transmitting (18) medium which is, in turn, placed within a pot die (20) of a press where it is restrained as a ram (24) enters the pot die (20) and applies a force to the pressure-transmitting medium (18) to densify the material within the container into a compact (10') of predetermined density. The pressure-transmitting medium (18) is characterized by a rigid interconnected ceramic skeleton structure (26) which is collapsible in response to a predetermined force and fluidizing glass (28) capable of fluidity and supported by and retained within the skeleton structure (26). The glass (28) becomes fluidic and capable of plastic flow at temperatures utilized for compaction whereas the ceramic skeleton (26) retains its configuration and acts as a carrier for the fluidic glass (28). As external pressure is applied by coaction between the pot die (20) and ram (24), the ceramic skeleton structure (26) collapses to produce a composite (18') of ceramic skeleton structure fragments (26') dispersed in the fluidizing glass (28) with the composite (18) being substantially fully dense and incompressible and rendered fluidic and capable of plastic flow at the predetermined densification of the material being compacted within the container. Accordingly, the ceramic skeleton structure (26) is dominant to provide structural rigidity and encapsulation and retainment of the fluidic glass (28') until the skeleton structure (26) is collapsed under ram (28') becomes dominant to provide omni-directional pressure transmission to effect the predetermined densification of the material being compacted within the container (12).
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patent: 3689259 (1972-09-01), Hailey
patent: 4041123 (1977-08-01), Langet et al.
patent: 4081505 (1978-03-01), Kawai
patent: 4368074 (1983-01-01), Otto, Jr. et al.
Hunt Brooks H.
Kelsey-Hayes Company
Milton Jr. Harold W.
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