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Evaluating the Risk of Corona Discharge in Superalloy Vacuum Induction Melting Furnace Applications

机译:高温合金真空感应熔炉应用中的电晕放电风险

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摘要

Corona discharge, or gas breakdown, is undesired in superalloy vacuum induction melting (VIM) applications as it can damage insulation, produce ozone and subsequently oxidize and contaminate the melt. Gas breakdown also introduces uncontrolled variations to the casting process and increases the risk of needing to scrap the end product. To reduce the risk of corona, a rule-of-thumb of 150 to 1000 micron (150 mTorr to 1 Torr) was developed in the past as a No-Go Pressure Zone. Operating within this zone has been observed to create an unwanted, readily ionizable environment. An analytical model is developed within this work to evaluate the historical rule-of-thumb. The analytical model incorporates the following elements: Paschen's law, gas compressibility, gas and insulation permittivity, and electric field non-uniformity. The model is then applied to a sampling of VIM furnace designs to evaluate the shifts of the No-Go Pressure Zone due to variations in configuration and other operating conditions. In the end, the objective is to improve VIM furnace design and operation to reduce the risk of corona discharge-thereby improving the casting process, practice of alloy melting and quality of the end product.
机译:电晕放电或气体击穿,在超合金真空感应熔化(Vim)应用中不希望,因为它可以损坏绝缘,产生臭氧并随后氧化并污染熔体。气体分解还引入了对铸造过程的不受控制的变化,并提高了需要废除最终产品的风险。为了降低电晕的风险,过去的拇指为150至1000微米(150毫瓦至1托),作为空压区。观察到该区域内的操作以创造不需要的,易于电离的环境。在这项工作中开发了一个分析模型,以评估历史规则的拇指。分析模型包括以下元素:Paschen的定律,气体可压缩性,气体和绝缘介质,以及电场不均匀性。然后将该模型应用于Vim炉设计的采样,以评估由于配置和其他操作条件的变化而导致的无-Go压力区的换档。最后,目的是改善Vim炉的设计和操作,以降低电晕放电的风险 - 从而改善铸造过程,合金熔化的实践和最终产品的质量。

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