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- W1982259633 abstract "Many high purity materials can be synthesized by a self-sustaining gas-phase flame for example: photovoltaic silicon; advanced fuels (e.g., boron); refractory metals (e.g., titanium, tantalum, zirconium, hafnium and niobium); and ceramics (e.g., silicon carbide, silicon nitride, tantalum carbide, titanium boride, and zirconium boride). Reactive metals, e.g., sodium or magnesium, combined with metal halides or mixtures of halides react hypergolically to produce the desired product as an aerosol and the by-product, reactive metal halide, in the gas phase. The key to the success of the process is the separation of the product from the by-product. This has been achieved by a novel supersonic impaction technique. The reaction products are expanded through a nozzle to produce a supersonic stream which is caused to impact a surface to produce a shock wave. The particles, unable to make the sharp turn behind the shock wave along with the gas, impact the surface where they are collected either as a solid, liquid, or powder, depending upon the surface configuration and temperature. The process has been examined thermodynamically for a large number of systems, and it has been demonstrated experimentally for silicon at 1.5 kg/h and yields exceeding 90%. Product purity is very high because of self-purification mechanisms inherent in the process." @default.
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- W1982259633 date "1992-01-01" @default.
- W1982259633 modified "2023-09-24" @default.
- W1982259633 title "A new gas-phase combustion synthesis process for pure metals, alloys, and ceramics" @default.
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- W1982259633 doi "https://doi.org/10.1016/s0082-0784(06)80219-5" @default.
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