Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Including a second component containing structurally defined...
Patent
1993-07-14
1995-01-31
Nakarani, D. S.
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Including a second component containing structurally defined...
264122, 264126, 264127, 264131, 427212, 428144, 4283084, 4283179, 428327, 428328, 428329, 428330, 428331, 428403, 428404, 428406, 428407, 521145, 521919, 523201, 523205, 523206, 525902, B28B 1106, B29C 5900, B32B 516
Patent
active
053857801
ABSTRACT:
Particles of a fine powder of a thermoplastic synthetic resin (host powder) having a suitable broad range between its initial glass transition temperature (initial T.sub.g) and its final T.sub.g, are partially coated with an anti-caking coating powder (coating powder) by blending at an elevated temperature to form "mottled" particles. The elevated temperature is defined in relation to the initial and final T.sub.g s as: (initial T.sub.g -20).degree. C. but below the final T.sub.g. Mottled particles, without being encapsulated, have the unique ability to maintain their individual particulate characteristics at a temperature at least 10.degree. C. above the initial T.sub.g of the uncoated host powder, and flow freely under applied pressure. Such pressure is applied by a rolling drum which spreads the mottled particles onto a target bed where they are selectively sintered With a controlled high energy beam, usually a laser beam. Sequentially sintering contiguous layers of the mottled particles results in a porous sintered body. Such a body may be used to make a prototype of an article, which may be difficult or too expensive to machine, then to form a shell mold for use in investment casting. Mottled particles, when stored above their initial T.sub.g, form a bed from 10% to 65% more dense than a bed of uncoated host particles, even when the coating powder coats less than 50% of the area of the particles of host powder.
REFERENCES:
patent: 5034432 (1991-07-01), Ueno et al.
Lobo Alfred D.
Nakarani D. S.
Shust Nestor W.
The B. F. Goodrich Company
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