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首页> 外文期刊>Journal of Materials Science >Hydrogen gas pick-up mechanism of Al-alloy melt during Lost Foam Casting
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Hydrogen gas pick-up mechanism of Al-alloy melt during Lost Foam Casting

机译：消失模铸造铝合金熔体中氢气的吸收机理

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The hydrogen gas pick-up problem that can occur during Lost Foam Casting was investigated with reduced pressure tests and real castings. The initial hydrogen concentration of the melt and the contact time between melt and polystyrene had a main effect on the hydrogen gas pick-up of Al melt. The hydrogen gas pick-up of Al alloy depended also on pouring temperature and a proper metal front temperature gave the minimum hydrogen pick-up. At a low pouring temperature, the hydrogen went into the melt mainly from entrapped liquid product of polystyrene but at high pouring temperature it was by the gas as well as the liquid product. The mold flask evacuation down to 710 torr decreased the gas porosity down by around 0.4 vol%. The permeability of coating thickness had a great effect because it affects the filling time and the easy removal of liquid polystyrene. (C) 2004 Kluwer Academic Publishers. [References: 10]
机译：通过减压测试和实际铸件研究了失泡沫铸造过程中可能发生的氢气吸收问题。熔体的初始氢浓度以及熔体与聚苯乙烯之间的接触时间对Al熔体的氢气吸收有主要影响。铝合金的氢气吸收量还取决于浇铸温度，适当的金属前沿温度可以使氢气的吸收量最小。在较低的浇注温度下，氢气主要从截留的聚苯乙烯液体产物进入熔体，但在较高的浇注温度下，氢气既与气体一样，也与液体产物一样。抽空至710托的模具烧瓶使气体孔隙率降低了约0.4％（体积）。涂层厚度的渗透性具有很大的影响，因为它影响填充时间和液体聚苯乙烯的容易去除。 （C）2004 Kluwer学术出版社。 [参考：10]

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