AMORPHOUS COMPOSITION AND MANUFACTURE

摘要

A glassy amorphous compsn. comprising silica and one other component is obtd. from an aq. or organic soln. of a precursor of the other component, by addn. of a silane. A reagent which hydrolyses the silane is then added and reaction effected to bring about polymerisation. The solvent is removed by spray drying, and the residue pyrolysed. The soln. may be aq., and the precursor an alkoxide of Mg or B. In a modification an amorphous cordierite-forming glass is produced from a soln. contg. at least two precursors to which a silane is added and hydrolysed. The precursors may be beta-diketonates or Mg and/or Al.