Compositions: ceramic – Ceramic compositions – Glass compositions – compositions containing glass other than...
Patent
1988-04-21
1990-06-12
Bell, Mark L.
Compositions: ceramic
Ceramic compositions
Glass compositions, compositions containing glass other than...
501 33, 501 35, 501 54, 501 55, 501 59, 501 63, 501 64, 501 65, 501 66, 501 67, 501 68, 501 69, 501 70, 501 71, 501 72, 65 31, C03C 1100, C03C 1200, C03C 1302
Patent
active
049333070
ABSTRACT:
Porous, silica-rich shapes have improved strength and abrasion resistance by leaching the precursor glass shape in preconditioned acid having silica ion and at least one common ion that is also present in the precursor glass shape. The precursor glass shapes have shapes such as fibers, hollow fibers, tubes, rods, beads, hollow spheres and plates and compositions having 30-75 volume percent silica and at least 10-65 volume percent nonsiliceous acid extractable components. Preconditioning of the acid solution results from a pretreatment of the acid with compounds that dissociate into the ions when added to the acid solution or with shapes, particles or fragments of glass compositions different from or similar to the glass shape to be leached so long as the glass composition has extractable material to provide the silica ion and at least one common ion.
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Barch Herbert W.
Hammel Joseph J.
Hegedus Roy D.
Marshall William P.
Robertson Walter J.
Bell Mark L.
Green Anthony J.
PPG Industries Inc.
Stachel Kenneth J.
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