Fired ceramic having dense and low thermal expansion characteris

Details Fired ceramic having dense and low thermal expansion characteris Fired ceramic having dense and low thermal expansion characteris

1978-06-07

1980-03-25

McCarthy, Helen M.

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

106 396, 106 397, 106 65, 106 732, 106 7333, 106 734, 106 735, C04B 3518, C04B 3520, C04B 3550

Patent

active

041949170

ABSTRACT:
A fired ceramic having dense and low thermal expansion characteristics comprises 0.3 to 8 wt. % of at least one of rare earth oxides and has a thermal expansion coefficient of less than 0.3% and a porosity of less than 10%.
The fired ceramic having dense and low thermal expansion characteristics comprises a main component of cordierite, lithium aluminosilicates or aluminum titanate.
The rare earth oxide is preferably Y.sub.2 O.sub.3 and can be CeO.sub.2 or La.sub.2 O.sub.3.

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Smoke, E. J., "Inorganic Dielectrics Research,"-R & D Technical Report-0232-5, U.S. Army Electronics Command, Dec. 1969, pp. 153-156, pp. 165-171.
Chem. Abstracts-69, (1968), Item 4842y, "Dielectric Constants of Microcrystalline Glasses Containing Compounds of Bismuth, Lead and Cerium."

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