Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F21—LIGHTING
  • F21H—INCANDESCENT MANTLES; OTHER INCANDESCENT BODIES HEATED BY COMBUSTION
  • F21H1/00—Incandescent mantles; Selection of imbibition liquids therefor
  • F21H1/02—Incandescent mantles; Selection of imbibition liquids therefor characterised by the material thereof

Definitions

• the invention relates to a gas incandescent body for gas lighting, consisting of one held on a base mineral framework on the basis of yttrium oxide, as well a process for its manufacture.
• Gas filament of the type mentioned above also as burned Gas lamps are mainly used for street lighting, in warning lights, especially on water and on railway signal lights, or in portable lights, for example in the camping area.
• the mesh-like trained oxide structure of the gas filament sends when heated by a gas flame due to thermoluminescence emission a glistening bright light (Auerlicht) out.
• other gases for example Propane gas used.
• the oxide framework mostly consists of a predominant proportion of radioactive thorium oxide.
• thorium-containing gas incandescent bodies represent because of the radioactivity of the thorium, especially if improper Use, but also during the manufacturing process, is a hazard that should not be underestimated. It therefore has not lacking in intensive efforts, the thorium content in the filament frame or lower the thorium even completely by other, non-radioactive substances to replace.
• DE 197 15 413 is a gas incandescent body from an oxide framework held on a ceramic base known that consists of at least 98 wt .-% of yttrium oxide and 0.8 to 1.6 wt% ceria, 0.008 to 0.2 wt% Contains aluminum oxide and 0 to 0.2 wt .-% magnesium oxide.
• This thorium-free glass filament stands out by a sufficiently high and above all a long one Period of constant light output.
• the oxide framework is stabilized with magnesium oxide in the area of the ceramic base, to at least in this part of the gas filament to improve the strength properties.
• the oxide structure remains mechanically highly sensitive, so that the lifespan due to vibration, for example through vehicle traffic with street lights or through the constant movement of arranged on water Warning devices, is restricted.
• the oxide structure during the Burning process in the course of the manufacturing process can there is insufficient shrinkage behavior, the to cracks and missing parts and an irregular shape of the oxide framework and the life and light output of the gas incandescent body is reduced.
• the invention has for its object a gas filament of the type mentioned and a procedure train its manufacture so that the finished products a uniformly shaped, homogeneous and in itself have stable oxide structure in order to operate as a light source even under mechanical stress Shocks a long life at essentially to ensure constant light output.
• the object is achieved with a gas incandescent body according to the features of independent claim 1 and with a method for its production according to Features of independent claim 4 solved.
• the basic idea of the invention is in that the mesh-like formed from an oxide mixture Framework of the gas incandescent body next to yttrium oxide and Contains cerium oxide as a further component of beryllium oxide. That instead of the usually provided alumina Beryllium oxide used ensures a homogeneous, stable structure of the oxide mixture.
• the filament will evenly and without internal during the burning process Tensions shaped. That is, during the molding shape of the gas filament during the burning process, Cracks and missing parts to a much lesser extent on, and on the other hand also the mechanical strength significantly increased, so that improved stability against vibrations, for example due to the constant movement of warning lights in water.
• beryllium oxide in combination with yttrium and cerium oxide a non-radioactive radiant gas glow plug with uniform shape and Mesh size will be provided, which also at mechanical stress over a long period of time constant light output guaranteed.
• Oxide framework of at least 97.6% yttrium oxide and a maximum of 1.8% from cerium oxide and a maximum of 0.6% from beryllium oxide.
• the oxide structure in the area of the ceramic base by a mixture of Aluminum salt and a magnesium salt reinforced so that the stability against vibrations is further improved becomes.
• an artificial silk fabric certain Mesh size with an aqueous solution with at least 97.5% by weight of yttrium nitrate and a maximum of 1.5% by weight of cerium nitrate and impregnated with a maximum of 1.0% by weight of beryllium nitrate.
• a preferred impregnation solution contains 98.6 % By weight yttrium nitrate, 0.8% by weight cerium nitrate and 0.6% by weight Beryllium.
• a tubular artificial silk fabric which was knitted with 120 or 180 needles in a predetermined mesh size, is in an aqueous impregnation solution containing 98.8% by weight yttrium nitrate (Y (NO 3 ) 4 ), 0.8% by weight. Contains cerium nitrate (Ce (NO 3 ) 4 ) and 0.6% by weight beryllium nitrate (Be (NO 3 ) 2 ). Then the artificial silk fabric tube is centrifuged and dried. The fabric fibers are now impregnated with a mixture of the salts mentioned above. In a subsequent treatment with ammonia solution, the three nitrate salts are converted into the respective hydroxides.
• Y (NO 3 ) 4 yttrium nitrate
• Be (NO 3 ) 2 beryllium nitrate
• the synthetic silk fabric treated in this way is now cut into sections which are sized according to the size of the gas incandescent body and which are individually preformed and each attached to a ceramic base.
• a salt solution consisting of 30% by weight magnesium nitrate (Mg (NO 3 ) 2 ) and 10% by weight aluminum nitrate (Al (NO 3 ) 3 ) is additionally applied to the artificial silk fabric.
• the synthetic silk knit is first burned (ashing), whereby the hydroxides are converted into oxides and a salt structure made of yttrium oxide, cerium oxide and beryllium oxide remains in the illuminated area of the gas incandescent body. and aluminum salt is reinforced.
• the oxide framework protruding from the ceramic base is stretched and shaped.
• composition of the salt mixture from yttrium oxide and cerium oxide in connection with the beryllium oxide used here according to the invention which is due to the small size of the beryllium ion Fits crystal structure, is already in the course of Burning process with good shrinking behavior a stable, uniformly shaped oxide structure with reduced inclination for the formation of defects and cracks and more even Mesh size generated, so that the reject rate the known gas incandescent bodies significantly reduced is.
• the light output, to which also the uniform shape and contributes to the mesh size of the oxide structure corresponds to Essentially that of the well-known thorium-free gas filament yttrium-based.

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• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Compositions Of Oxide Ceramics (AREA)

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Citations (6)

• 2002
  • 2002-01-23 EP EP02090033A patent/EP1331435A1/fr not_active Withdrawn

Patent Citations (6)

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