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首页> 外文期刊>Journal of Materials Engineering and Performance >Carbon Transfer in Sodium System Under Thermal Cycling-Possibility of 'Metal Dusting'
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Carbon Transfer in Sodium System Under Thermal Cycling-Possibility of 'Metal Dusting'

机译：在热循环下钠系统中的碳转移-“金属除尘”的可能性

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摘要

High temperature sodium systems encounter thermal cycling during operation. Under this condition, the behavior of carbon dissolved in sodium needs special attention. Carbon chemistry of sodium is very complex because of the existence of multiple carbon-bearing species. In addition, carbon exists both in the dissolved ("active") and undissolved ("inactive") forms. Under thermal cycling conditions, as the temperature is lowered, carbon may precipitate as sodium acetylide. The equilibrium carbon activity imparted by this species is high enough to cause the precipitation of iron carbide (Fe_3C) in ferrous alloys. The Fe_3C may be destabilized at lower activities of carbon in the environment (when the temperature is increased) and may decompose to a fine dispersion of metal and graphite. This phenomenon of "metal dusting" is extremely detrimental to the components of sodium systems. The article analyses the possibility of "metal dusting" in an operating sodium system.
机译：高温钠系统在运行过程中会发生热循环。在这种情况下，需要特别注意碳溶解在钠中的行为。钠的碳化学非常复杂，因为存在多种含碳物质。另外，碳以溶解（“活性”）和未溶解（“惰性”）形式存在。在热循环条件下，随着温度降低，碳可能沉淀为乙炔酸钠。这种物质赋予的平衡碳活性足够高，足以引起铁合金中碳化铁（Fe_3C）的析出。 Fe_3C在环境中较低的碳活度下（温度升高时）可能不稳定，并可能分解为金属和石墨的精细分散体。这种“金属粉尘”现象对钠系统的成分极为不利。本文分析了在运行的钠系统中“金属粉尘”的可能性。

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