Mixture of grains and particles of vitreous silica, and new mate

Details Mixture of grains and particles of vitreous silica, and new mate Mixture of grains and particles of vitreous silica, and new mate

1993-05-20

1995-02-14

Group, Karl

Compositions: ceramic

Ceramic compositions

Refractory

C04B 3514

Patent

active

053895916

ABSTRACT:
The invention relates especially to a mixture of grains and particles of fused vitreous silica produced by dry mixing: (i) a moderately coarse particle size fraction of fused vitreous silica, (ii) a fine particle size fraction of fused vitreous silica, in which at least 95% by weight of the grains are smaller than 40 .mu.m, (iii) substantially spherical particles of fume silica, and (iv) optionally, at least one particle size fraction of fused vitreous silica which is coarser than fraction (i), the constituents (i) to (iv) being employed in the following proportions by weight: (i) 15-70%, (ii) 15-55%, (iii) 3-15% and (iv) 0-52%. The mixture can be used for the production of articles made of sintered vitreous silica.

REFERENCES:
patent: 4297309 (1981-10-01), North
patent: 4506025 (1985-03-01), Kleeb et al.
patent: 4929579 (1990-05-01), Lassiter

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