Low density silica particles and method for their preparation

Details Low density silica particles and method for their preparation Low density silica particles and method for their preparation

1998-12-21

1999-11-02

Nguyen, Ngoc-Yen

Chemistry of inorganic compounds

Silicon or compound thereof

Oxygen containing

501 39, 502 10, 23308R, C01B 33113, C03C 1100, B01J 2010

Patent

active

059764783

ABSTRACT:
Internal porosity is created in dense SiO.sub.2 particles by heating a mixture of the particles with B.sub.2 O.sub.3 at a temperature above about 450.degree. C. Resulting SiO.sub.2 particles have altered morphology, internal porosity, and small to negative volume changes when heated.

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P. C. Shultz, New zero-expansion glasses in the TiO/sub 2/-SiO/sub 2/system, 1972 Annual Meeting of the Optical Society of America. Abstracts Only, San Francisco, CA, USA, Oct. 17-20, 1972, p. 72.

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