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

1997-06-09

1999-01-19

Nguyen, Ngoc-Yen

Chemistry of inorganic compounds

Silicon or compound thereof

Oxygen containing

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

Patent

active

058611347

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 above the melting point of both mixture components. Resulting SiO.sub.2 particles have altered morphology, internal porosity, and a negative thermal expansion coefficient when heated.

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