Method of forming cavitated objects of controlled dimension

Details Method of forming cavitated objects of controlled dimension Method of forming cavitated objects of controlled dimension

C - Chemistry, Metallurgy

08

J

18/639

C08J 9/22 (2006.01) C03B 19/10 (2006.01) C08J 9/228 (2006.01)

Patent

CA 1168818

Abstract of the Disclosure A method of controllably varying the dimensions of cavitated objects such as hollow spherical shells wherein a precursor shell is heated to a temperature above the shell softening temperature in an ambient atmosphere wherein the ratio of gases which are permeable through the shell wall at that temperature to gases which are imper- meable through the shell wall is substantially greater than the corresponding ratio for gases contained within the precursor shell. As the shell expands, the partial pressures of permeable gases internally and externally of the shell approach and achieve equilibrium, so that the final shell size depends solely upon the difference in impermeable gas partial pressures and shell surface tension.

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