Preparation of selective infrared line emitter composites
First Claim
1. A method of making a selective infrared line emitter composite of a sinter-bonded stuctural fiber and a selectively emitting rare earth metal oxide, said method comprising forming a dispersion of at least one structure-forming fiber having an emissivity less than 0.1 within the wavelength region of 0.7 to 5 microns, a high surface area carbon fiber of at least 200 m2 /g, and a binder in a liquid medium, collecting a mat of the dispersion, removing the liquid medium from the mat of the dispersion to afford a dried dispersion mat, heating the dried dispersion mat in an inert atmosphere at conditions sufficient to volatilize at least 99 weight percent of the binder and sinter-fuse the structure-forming fibers to form a binderless network of the structure-forming fiber and the high surface area carbon fiber, impregnating the high surface area carbon fiber of the binderless network with an aqueous solution of a rare earth compound, drying the impregnated binderless network, and heating the dried, impregnated binderless network to gasify the high surface area carbon fiber therein and convert the rare earth metal compound to its oxide.
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Abstract
Robust, large area selective infrared line emitters can be made using composites of rare earth metal compound particulates dispersed and interlocked in a network of connected structure-forming fibers having an emissivity less than about 0.1 in the range 0.7-5 microns. Articles where the composite is formed of rare earth metal oxide fibers in a network of sinter-bonded quartz fibers show narrow bandwidth emissions with good thermal conversion efficiencies.
14 Citations
8 Claims
- 1. A method of making a selective infrared line emitter composite of a sinter-bonded stuctural fiber and a selectively emitting rare earth metal oxide, said method comprising forming a dispersion of at least one structure-forming fiber having an emissivity less than 0.1 within the wavelength region of 0.7 to 5 microns, a high surface area carbon fiber of at least 200 m2 /g, and a binder in a liquid medium, collecting a mat of the dispersion, removing the liquid medium from the mat of the dispersion to afford a dried dispersion mat, heating the dried dispersion mat in an inert atmosphere at conditions sufficient to volatilize at least 99 weight percent of the binder and sinter-fuse the structure-forming fibers to form a binderless network of the structure-forming fiber and the high surface area carbon fiber, impregnating the high surface area carbon fiber of the binderless network with an aqueous solution of a rare earth compound, drying the impregnated binderless network, and heating the dried, impregnated binderless network to gasify the high surface area carbon fiber therein and convert the rare earth metal compound to its oxide.
Specification
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- Resources
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Current AssigneeAuburn University
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Original AssigneeAuburn University
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InventorsRose, Millard F., Adair, Peter L.
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Primary Examiner(s)DIXON, MERRICK L
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Application NumberUS08/460,042Time in Patent Office718 DaysField of Search264/128, 264/331.14, 264/127, 264/104, 264/105, 264/122, 264/125, 264/65, 264/61, 264/56, 264/59, 264/60, 264/29.4, 264/29.6, 264/29.2, 264/248, 264/DIG. 75 , 264/DIG. 257, 156/187US Class Current264/105CPC Class CodesC04B 2235/5224 Alumina or aluminatesC04B 2235/5232 Silica or silicates other t...C04B 2235/5236 ZirconiaC04B 2235/5409 expressed by specific surfa...C04B 35/50 based on rare-earth compoun...C04B 35/6365 Cellulose or derivatives th...C04B 35/76 Fibres, filaments, whiskers...C04B 35/80 Fibres, filaments, whiskers...Y10S 264/75 Processes of uniting two or...Y10S 428/917 ElectroluminescentY10S 501/904 Infrared transmitting or ab...Y10T 428/31 Surface property or charact...Y10T 442/2926 Coated or impregnated inorg...Y10T 442/618 Blend of chemically differe...Y10T 442/625 Autogenously bondedY10T 442/696 Including strand or fiber m...
