Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – Of inorganic materials
Patent
1973-04-02
1977-04-12
White, Robert F.
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
Of inorganic materials
164120, 264 49, B29D 2700, B22F 302, B22F 310
Patent
active
040175715
ABSTRACT:
The preparation of three dimensional skeletal structures using the step of deforming rounded beads to form a mold or matrix is described. A filler material is introduced and then rigidified to form the skeletal structure. The deformable beads are composed of materials which deform upon compression or expansion due to pressure from adjacent beads and included, for instance, metals, waxes, salts, polymers, and ceramic compositions in their plasticly deformable states. The filler material which rigidifies to form the skeletal structure can be composed of solidifiable materials such as metals, polymers, or ceramic compositions. The solid material volume of the skeletal structure so formed upon removal of the beads is between about two percent (2%) to twenty percent (20%) of a corresponding volume of a non-skeletal solid material. The corresponding porosities representing the interconnected void volumes are between about eighty percent (80%) and ninety-eight percent (98%) of a corresponding volume of a non-skeletal solid material. The skeletal structures so formed can be flexible, semiflexible or rigid and are useful as heat exchangers, catalyst supports, distillation tower packings, filters and the like.
REFERENCES:
patent: 2695231 (1954-11-01), Causley
patent: 3078552 (1963-02-01), Grandey
patent: 3258349 (1966-06-01), Scott
patent: 3336134 (1967-08-01), Kulp et al.
patent: 3396923 (1968-08-01), Windecker
patent: 3535110 (1970-10-01), Todd
patent: 3734723 (1973-05-01), Blasch
"Powder Metallurgy", Peter Schwarzkopf, Int. Journal of Powder Metallurgy, 2/4/1966, pp. 3-11.
Norris Hugh Richard
Rice Warren A.
Vinton Clarence S.
Chemotronics International, Inc.
Lowe James B.
McLeod Ian C.
White Robert F.
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