Process and apparatus for producing polycrystalline,...

Details Process and apparatus for producing polycrystalline,... Process and apparatus for producing polycrystalline,...

B - Operations, Transporting

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B

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B28B 3/20 (2006.01) B28B 3/26 (2006.01) C04B 35/115 (2006.01) C04B 35/634 (2006.01) C04B 35/636 (2006.01)

Patent

CA 1246328

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 adhe- sives 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 mechani- cal strength of at least 320 N/mm2 and an in-line light transmission of more than 64%.

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