Glasses and glass-ceramics containing rutile fibers

Compositions: coating or plastic – Coating or plastic compositions – Marking

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C03C 322

Patent

active

039486699

ABSTRACT:
This invention is concerned with the production of composite articles comprising a glass or glass-ceramic matrix containing long fibrous single crystals of rutile (TiO.sub.2) of very high aspect ratios grown in situ. The glass articles are formed via the heat treatment of a molten batch consisting essentially, by weight on the oxide basis, of about 45-65% B.sub.2 O.sub.3, 5-30% Al.sub.2 O.sub.3, 5-30% TiO.sub.2, and 3-30% alkaline earth metal oxides and can exhibit greatly improved mechanical strength and toughness when compared with the original, or fiber-free, glass. The glass-ceramic articles are formed by heat treating the fiber-containing glass in a particular manner to cause the development of fine-grained crystals in situ, resulting in a highly-crystalline article containing long fibrous single crystals of rutile exhibiting verh high aspect ratios.

REFERENCES:
patent: 2876074 (1959-03-01), Johnson
patent: 2920971 (1960-01-01), Stookey
patent: 3899340 (1975-08-01), Malmendier
patent: 3901719 (1975-08-01), Brydges et al.

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