Ballistic-resistant glass-ceramic and method of preparation

Details Ballistic-resistant glass-ceramic and method of preparation Ballistic-resistant glass-ceramic and method of preparation

1982-08-16

1984-09-25

McCarthy, Helen M.

Compositions: ceramic

Ceramic compositions

Devitrified glass-ceramics

2 25, 65 33, 65134, 428911, 501 5, 501 10, 501 64, 501 67, 501 69, C03C 322

Patent

active

044736533

ABSTRACT:
A composition and method of making a high strength semi-crystalline ceramic material of the lithium, aluminum, silicon oxides system type. The composition is characterized by a relatively narrow range of lithium, aluminum, silicon and potassium oxides to form a base glass batch and is modified by including a novel proportional combination of the catalysts or modifiers comprising the components TiO.sub.2, ZrO.sub.2 and SnO.sub.2 and including one or more additives taken from a group consisting of B.sub.2 O.sub.3, MgO, Cr.sub.2 O.sub.3, CeO.sub.2, V.sub.2 O.sub.5 and Na.sub.2 O within specific percentage ranges.
The composition is formed and subjected to heat treatment within certain time and temperature steps to provide for the desired degree, size and type of crystalline formation (lithium disilicate, cristobalite, spinel) which exhibits the desired physical, mechanical and chemical properties which include a superior resistance to high speed projectiles for armor applications.

REFERENCES:
patent: 2971853 (1961-02-01), Stookey
patent: 3238085 (1966-03-01), Hayami et al.
patent: 3380818 (1968-04-01), Smith
patent: 3804608 (1974-04-01), Gaskell et al.
patent: 3809543 (1974-05-01), Gaskell et al.
patent: 3977857 (1976-08-01), Mattox
Handbook of Chemistry and Physics-54th Ed. (1973-1974) p. F-18 "Comparison of Hardness Values of Various Materials on Mohs and Knoop Scales".

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