Heat-and corrosion-resisting protection tube

Details Heat-and corrosion-resisting protection tube Heat-and corrosion-resisting protection tube

1997-09-30

2000-07-25

Dye, Rena L.

Stock material or miscellaneous articles

Hollow or container type article

Glass, ceramic, or sintered, fused, fired, or calcined metal...

428 345, 428213, 4283122, 428332, 428338, 428702, 501119, 501120, 501121, 501127, C04B 3503, C04B 3510, F16L 910

Patent

active

060934611

ABSTRACT:
The present invention relates to a protection tube for protecting heaters and sensors used in melting furnace for reprocessing of incinerator ash, other melting furnace, and various other furnaces, the protection tube being excellent in resistance to heat and resistance to corrosion so as to be usable favorably for a long period. The heat- and corrosion-resisting protection tube is formed in a tubular body closed at an end, being composed of ceramics, and the ceramics have a softening point over 1700.degree. C. in the air atmosphere, a three-point bending strength of 150 MPa or more at 1450.degree. C., a resistance to heat shock of .DELTA.T of 150.degree. C. or more by water quenching method, and a mean grain size of 2 .mu.m or more, having a composition of 50 mol % or more of Al.sub.2 O.sub.3 and 50 mol % or less of MgO.

REFERENCES:
patent: 3311482 (1967-03-01), Klingler et al.
patent: 4060095 (1977-11-01), Kurita
patent: 4067792 (1978-01-01), Semkina et al.
patent: 4135538 (1979-01-01), Kurita
patent: 4211624 (1980-07-01), Semkina et al.
patent: 4948538 (1990-08-01), Wei et al.
patent: 5230565 (1993-07-01), Aoki et al.

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