Plastic and nonmetallic article shaping or treating: processes – Spheroidizing or rounding of solid particles
Patent
1986-12-12
1988-09-06
Silbaugh, Jan H.
Plastic and nonmetallic article shaping or treating: processes
Spheroidizing or rounding of solid particles
264 43, B29B 912
Patent
active
047691891
ABSTRACT:
Process for making hollow, ceramic macrospheres by making a paste of a continuous phase material (e.g., sodium silicate or potassium silicate) and an insolubilizing agent (e.g., kaolin clay). Pellets are formed from the paste and expanded by subjection to heat to form hollow spheroids. The spheroids are fired at a temperature (typically 600.degree.-1000.degree. C.) and for a time sufficient to insolubilize the continuous phase material. The process may further include coating the fired spheroids with an epoxy resin (to reduce porosity) and/or bonding a plurality of the fired spheroids together to form a rigid mass of bonded spheroids.
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Kutach Karen D.
Little Douglas B.
Minnesota Mining and Manufacturing Company
Sell Donald M.
Silbaugh Jan H.
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