Glass beads having improved fracture toughness

Details Glass beads having improved fracture toughness Glass beads having improved fracture toughness

1995-02-06

1997-10-07

Warden, Jill

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Particulate matter

501 33, 501 34, 501 53, 501 55, 501 72, 65111, C03C 1200

Patent

active

056746164

ABSTRACT:
Glass beads in accordance with the present invention may be constituted of SiO.sub.2, Al.sub.2 O.sub.3, Na.sub.2 O, K.sub.2 O, BaO, SrO, TiO.sub.2, and CeO.sub.2. The glass of which the glass beads is made will generally contain at least 40% SiO.sub.2 as the network former, from about 10 to about 25% Na.sub.2 O and K.sub.2 O as fluxes, from about 5 to about 25% of BaO and/or SrO as a fracture resistance improvement components, a small amount of Al.sub.2 O.sub.3, and--when made from CRT waste--very small amounts of TiO.sub.2 and CeO.sub.2. The glass beads of the invention are suitable for use as reflective elements in roadway markings and as media in shot-peening metal cleaning procedures.

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