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          北京東方德菲儀器有限公司>>資料下載>>聲懸浮文獻(xiàn):航空聲懸浮--一種在高溫下進(jìn)行無(wú)容器液態(tài)處理的方法

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          聲懸浮文獻(xiàn):航空聲懸浮--一種在高溫下進(jìn)行無(wú)容器液態(tài)處理的方法

          閱讀:611        發(fā)布時(shí)間:2020-05-27
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            北京東方德菲儀器有限公司

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          A method for containerless ‘liquid-phase  processing was developed which has practical application in process and property research on virtually any material which is involatile at the melting point. It combines aerodynamic and acoustic forces to support and position the levitated material. The design provides forced convection control of the thermal boundary in the gas surrounding beam-heated specimens, which stabilizes the acoustic forces and allows acoustic positioning necessary to stabilize the aerodynamic levitation forces on molten materials. Beam heating and melting at very high temperatures was achieved. Experiments were conducted on specimens with diameters in the range 0.25-0.4 cm, of density up to 9 g/cm3, at temperatures up to 2700 K, and in oxygen, air, or argon atmospheres. Unique liquid-phase processing results included deep undercooling of aluminum oxide, glass formation at exceptionally small cooling rates, complete melting and undercooling  of YBa,Cu30,  superconductor  materials, direct formation of the YBa&O,  from the liquid phase, and the vaporization of volatile constituents from a low-liquefaction  point glass to form a refractory, high melting material..The application of rapid containerless batch processing operations to materials synthesis is discussed.

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