Study Application of High Energy and High Power Plasma Jet to Melting and Refining

高能大功率等离子射流在熔化精炼中的应用研究

• 批准号: 02555139
• 负责人: KOBAYASHI Akira
• 金额: $ 7.68万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research (B)
• 财政年份: 1990
• 资助国家: 日本
• 起止时间: 1990 至 1992
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02555139/
• 关键词: Plasma melting and refining; Gas tunnel type plasma jet; Aluminum; Titanium; High power plasma jet; Transferred energy; Melting efficiency; High energy plasma jet; ガストンネル型; 高温・高エネルギ-密度; 溶融効率

In this study, a gas tunnel type plasma jet, which is a high energy and high power type of heat source. has been applied to the melting of aluminum alloy which have been widely used, and the characteristics of this new plasma melting system was clarified experimentally. The results obtained are as follows:1) The thermal efficiency of this gas tunnel type plasma jet was more than 70%. The transferred energy to the substrate was increased expornentially as the operating distance (melting distance:L) was decreased.2) The melting efficiency of this plasma melting system was increased as the power input to plasma torch: P was increased. At P=25kW, L=30mm, the melting efficiency of aluminum alloy was more than 30%3) The observation of microstructure showed that the melted Al alloy had many pores hardness of the melted Al alloy was decreased rather than that of as received Al alloy.The surface nitridation of titanium materials was carried out at low pressure in a nirtogen atmosphere by using gas tunnel type plasma jet.1) The TiN film which gad the value of Hv=2000 was obtained effectively. The ratio of nitridation of the TiN film, in the case of Ti alloy, was almost 100%2) The analysis of composition of melted Ti marerials showed the possibility of the formation of new functionally materials by high energy plasma jet.

在这项研究中，气体隧道型等离子射流是一种高能、高功率类型的热源。已应用于已广泛应用的铝合金熔炼中，并通过实验阐明了这种新型等离子熔炼系统的特点。得到的结果如下： 1)该气体隧道式等离子射流的热效率达到70%以上。随着操作距离（熔化距离：L）的减小，转移到基材的能量呈指数增加。2）该等离子熔化系统的熔化效率随着等离子炬的输入功率：P的增加而增加。在P=25kW、L=30mm时，铝合金的熔化效率大于30%3)显微组织观察表明，熔化的铝合金有很多气孔，熔化的铝合金的硬度较原态铝合金有所下降。采用气体隧道式等离子射流在氮气气氛下进行低压表面氮化。1)有效地获得了Hv=2000的TiN薄膜。对于Ti合金，TiN薄膜的氮化率几乎为100%。2)对熔化的Ti材料的成分分析表明，高能等离子射流形成新型功能材料的可能性。