Ultra-low expansion ceramic articles

Details Ultra-low expansion ceramic articles Ultra-low expansion ceramic articles

1974-07-29

1976-05-18

Van Balen, William J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Physical dimension specified

65 33, 106 396, 106 40R, 106 48, 252477R, 252450, 428116, 428332, 428338, 156 7, 156 24, 156 25, C03C 322, B32B 500

Patent

active

039580580

ABSTRACT:
Ultra-low expansion ceramic articles, having average linear coefficients of thermal expansion below about 5.4 .times. 10.sup.-.sup.7 /.degree.C over the range from room temperature to 1000.degree.C, are produced by removal of MgO and Al.sub.2 O.sub.3 from cordierite articles by acid leaching to produce ceramic articles having oxide compositions in the range of about 55-75% SiO.sub.2, 18-32% Al.sub.2 O.sub.3, and 7-13% MgO which are characterized by the presence of a major amorphous silica-rich phase.

REFERENCES:
patent: 2731355 (1956-01-01), Skinner
patent: 2920971 (1960-01-01), Stookey
patent: 3061495 (1962-10-01), Alford
patent: 3112184 (1963-11-01), Hollenbach
patent: 3113008 (1963-12-01), Elmer
patent: 3113855 (1963-12-01), Elmer
patent: 3251403 (1966-05-01), Smith
patent: 3498774 (1970-03-01), Saffadi
patent: 3790654 (1974-02-01), Bagley
patent: 3856706 (1974-12-01), Harrison

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