Beta-spodumene glass-ceramics exhibiting excellent dimensional s

Details Beta-spodumene glass-ceramics exhibiting excellent dimensional s Beta-spodumene glass-ceramics exhibiting excellent dimensional s

1977-05-06

1978-11-21

Bashore, S. Leon

Compositions: coating or plastic

Coating or plastic compositions

Marking

65 33, 106 398, C03B 3200, C03C 322

Patent

active

041264770

ABSTRACT:
This invention is directed to the production of glass-ceramic articles having compositions within the Li.sub.2 O-Al.sub.2 O.sub.3 -SiO.sub.2 field nucleated with a combination of TiO.sub.2 + ZrO.sub.2 wherein beta-spodumene solid solution constitutes the primary crystal phase. Mullite and/or corundum along with ZrTiO.sub.4 solid solution and, occasionally, ZrO.sub.2 solid solution are present as secondary crystal phases. Because of their low coefficients of thermal expansion and exceptional long time dimensional stability at temperatures up to 1000.degree. C., the compositions can be useful in applications where extreme changes in temperature are experienced; for example, the construction of honeycomb structures used in regenerative heat exhchangers for turbine engines.

REFERENCES:
patent: 3241985 (1966-03-01), Kuwayama et al.
patent: 3582371 (1971-06-01), Bruno et al.
patent: 3804608 (1974-04-01), Gaskel et al.
patent: 4042403 (1977-08-01), Reade

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