Process for producing polycrystalline, translucent sintered tube

Details Process for producing polycrystalline, translucent sintered tube Process for producing polycrystalline, translucent sintered tube

1984-08-22

1986-12-16

Derrington, James

Plastic and nonmetallic article shaping or treating: processes

Including step of generating heat by friction

264 65, 264 66, 2642091, 425376R, 501153, C04B 3564

Patent

active

046295933

ABSTRACT:
An improved process for producing polycrystalline, translucent sintered aluminum oxide tubes for use as high pressure gas discharge lamps is provided, in which an aluminum oxide powder mixture is dispersed and foamed prior to plasticizing. Into the dried powder plasticizing components based on PVA or low viscosity, weakly swelling methylcellulose adhesives in the form of a paste are mixed and the powder mixture subsequently cold formed to tubular form by extrusion. The application of these measures results not only in an especially low surface roughness with an average value of 0.2 micron, but also in a mechanical strength of at least 320 N/mm.sup.2 and an in-line light transmission of more than 64%.

REFERENCES:
patent: 3026210 (1962-03-01), Coble
patent: 4020134 (1977-04-01), Gordan et al.
patent: 4169875 (1979-10-01), Laska et al.
patent: 4396595 (1983-08-01), Heytmeijer et al.

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