Application of a weak-ionized plasma high-temperature flow for material development and treatment of hazardous substance, and its flow diagnostics

弱电离等离子体高温流在材料开发和有害物质处理中的应用及其流动诊断

• 批准号: 15560142
• 负责人: KAWAZOE Hiromitsu
• 金额: $ 2.24万
• 依托单位: Tottori University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15560142/
• 关键词: Weak ionized plasma; Arc-heated wind tunnel; Supersonic; Spectroscopy; Material change; Material hardness; Numerical simulation; EPMA; 合金

Weak ionized high temperature nitrogen plasma flow could be generated stably with the electrical energy of 9 kW. Optical diagnostics for the flow field, where a blunt cylindrical body was set, was undertaken to measure vibrational and rotational temperatures of the nitrogen, T_<vib> and T_<rot>. T_<rot> was 3,000±500 K and 2,500±500 K for the case of Mach number 5 and 6, respectively. On the other hand, T_<vib> was almost constant in the whole flow field for the both cases. It is considered that the required time for a nitrogen molecule to collide with an electron and its collision frequency might be the major factors for the reason.Copper and zinc components of a disc-shaped brass, which was exposed in the plasma flow, was drastically changed spatially. Furthermore, this weak ionized nitrogen plasma flow was found to have the ability to make steel hard by the gas nitriding. The steel with the Vickers hardness of 230 changed to be harder with the Vickers value of 630, and hardness of the steel was also changed spatially. It also suggests that the ionized nitrogen flow can be utilized to product a functionally gradient material.Nitrogen and oxygen mixture was ionized by the arc-plasma flow facility and the neutral O I and N I atoms was investigated optically by the Boltzmann plots method. The excited O I and N I temperatures were delived to be 18,500 K and 17,500K, respectively. Therefore, the temperature of a free electron should be 18,000±500K.

以9kw的电能可稳定产生弱电离高温氮等离子体流。对设置钝圆柱体的流场进行光学诊断，测量氮气的振动温度和旋转温度，T_<vib>和T_<rot>。在马赫数为5和6的情况下，T_< t>分别为3000±500 K和2500±500 K。另一方面，在两种情况下，T_<vib>在整个流场中几乎是恒定的。认为氮分子与电子碰撞所需的时间和碰撞频率可能是造成这种现象的主要因素。暴露在等离子体流中的圆盘状黄铜的铜和锌组分在空间上发生了剧烈的变化。此外，发现这种弱电离氮等离子体流具有通过气体氮化使钢变硬的能力。维氏硬度为230的钢在维氏硬度为630时变得更硬，并且钢的硬度也发生了空间变化。这也表明，可以利用电离氮流来生产功能梯度材料。用电弧等离子体流装置电离了氮氧混合物，用玻尔兹曼图方法研究了中性O I和N I原子的光学性质。激发的O I和N I温度分别为18,500 K和17,500K。因此，自由电子的温度应为18000±500K。

项目成果

超音速高エンタルピー窒素気流の新材料開発への応用

超音速高焓氮气流在新材料开发中的应用

• 发表时间: 2005
• 期刊: 日本機械学会中国四国支部第44回総会・講演会講演論文集 No.065-1
• 作者: 竹田大輔;友滝鉄志;川添博光
• 通讯作者: 川添博光

山内崇, 川添博光, 友滝鉄志: "超音速高エンタルピー窒素気流による鈍頭物体表面の改質と気流特性"第47回宇宙科学技術連合講演会講演集. CD-ROM・1D15. 280-283 (2003)

Takashi Yamauchi、Hiromitsu Kawazoe、Tetsushi Tomotaki：“超音速高焓氮气流对钝物体表面和气流特性的修改”第 47 届空间科学技术联盟会议记录 CD-ROM·1D15。 2003）

Application of Supersonic High Enthalpy Nitrogen Flow to Development of New Material

超音速高焓氮气流在新材料开发中的应用

• 发表时间: 2005
• 期刊: Proc 44th JSME Tyuu-Shikoku-branch Annual Meeting(in Japanese) No.065-1
• 作者: Takeda;D.;Tomotaki;T.;Kawazoe;H.
• 通讯作者: H.

超音速高エンタルピー窒素気流による鈍頭物体表面の改質と気流特性

超音速高焓氮气流对钝器表面及气流特性的改性

• 发表时间: 2003
• 期刊: 第47回宇宙科学技術連合講演会講演集 ldl5(CD-ROM)
• 作者: 山内崇;川添博光;友滝鉄志
• 通讯作者: 友滝鉄志

Material Alteration of Metal by High Temperature Plasma Flow and Its Flow Field

高温等离子体流对金属的物质蚀变及其流场

• 发表时间: 2005
• 期刊: Proc.49th Space Sciences and Technology Conf.(in Japanese) 2G16(CD-ROM)
• 作者: Tomotaki;T.;Takeda;D.;Kawazoe;H.
• 通讯作者: H.