Aluminum oxide tubes

Details Aluminum oxide tubes Aluminum oxide tubes

1989-11-22

1991-12-31

Seidleck, James J.

Stock material or miscellaneous articles

Hollow or container type article

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

138145, 428212, 428215, 4283073, F16L 910

Patent

active

050771051

ABSTRACT:
A gas-tight aluminum oxide tube having an Al.sub.2 O.sub.3 content of 98.0 to 99.8 wt-%, wherein the interior of the tube has a coating of Al.sub.2 O.sub.3 with a thickness of from 0.03 to 0.30 mm and a mean roughness R.sub.a of 2 to 10 .mu.m, is provided. Preferably, the outer surface of the tube can have a mean roughness of 1.0 to 1.5 .mu.m. Also, the coating material can contain from 15 to 30 vol-% pores and the tube material can contain from 5 to 10 vol-% pores.

REFERENCES:
patent: 4222978 (1980-09-01), Oda et al.
patent: 4396595 (1983-08-01), Heytmeijer et al.
patent: 4749601 (1984-01-01), Shimai et al.

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