Process for making non-porous micron-sized high purity silica

Details Process for making non-porous micron-sized high purity silica Process for making non-porous micron-sized high purity silica

1990-03-02

1991-11-05

Dixon, Jr., William R.

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

501 54, 501154, 423335, 423338, 65 211, 65 214, C03C 306, C01B 3312

Patent

active

050631799

ABSTRACT:
A process for making non-porous, dense, silica partices having a diameter of about 3 to 1000 microns, a nitrogen B.E.T. surface area less than about 1 m.sup.2 /g, a total impurity content of less than about 50 ppm and a metal impurity content content of less than about 15 ppm from an aqueous dispersion of fumed silica. The particles are converted into porous particles and sintered in an atmosphere having a water partial pressure of from about 0.2 to about 0.8 atmosphere for temperatures below about 1200.degree. C.

REFERENCES:
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patent: 3501269 (1970-03-01), Winyall et al.
patent: 4105427 (1978-08-01), Elmer
patent: 4317668 (1982-03-01), Susa et al.
patent: 4419115 (1983-12-01), Johnson et al.
patent: 4459245 (1984-07-01), Ryon et al.
patent: 4572729 (1986-02-01), Lang et al.
patent: 4681615 (1987-07-01), Toki et al.
patent: 4810415 (1989-03-01), Winkelbauer et al.
patent: 4840653 (1989-06-01), Rabinovich
"Sol Gel Processing of Ceramics and Glass", David Johnson, Jr., Ceramic Bulletin, vol. 64, No. 12 (1985), pp. 1597-1602.

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