郝建民,俞茂兰,陈永楠,陈宏.气体介质对常压等离子体还原氧化铜的影响[J].表面技术,2016,45(3):193-197,204.
HAO Jian-min,YU Mao-lan,CHEN Yong-nan,CHEN Hong.The Influence of Gas Medium on Reduction of CuO with Atmospheric Pressure Plasma Jet[J].Surface Technology,2016,45(3):193-197,204 |
| 气体介质对常压等离子体还原氧化铜的影响 |
| The Influence of Gas Medium on Reduction of CuO with Atmospheric Pressure Plasma Jet |
| 投稿时间：2015-09-20 修订日期：2016-03-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2016.03.032 |
| 中文关键词: 常压射流等离子体 氨分解 氧化铜 气体介质 |
| 英文关键词:atmospheric plasma jet decomposed NH3 CuO gas medium |
| 基金项目: |
|
|
| Author | Institution |
| HAO Jian-min | Material Surface Strengthening Research Institute, Chang'an University, Xi'an 710054, China |
| YU Mao-lan | Material Surface Strengthening Research Institute, Chang'an University, Xi'an 710054, China |
| CHEN Yong-nan | Material Surface Strengthening Research Institute, Chang'an University, Xi'an 710054, China |
| CHEN Hong | Material Surface Strengthening Research Institute, Chang'an University, Xi'an 710054, China |
|
| 摘要点击次数: |
| 全文下载次数: |
| 中文摘要: |
| 目的利用常压射流型等离子体还原氧化铜,以不同的等离子体还原介质和还原时间为研究对象,讨论了两者对氧化铜还原的影响。方法实验采用等离子焰流扫描试样,然后应用扫描电镜观察还原后试样的表面微观形貌,通过X射线衍射仪分析试样处理前后表面相成分的变化。结果采用N2+热氨作为气体介质,其还原产物为Cu4O3和Cu3O,相对于其他气体介质得到的还原产物Cu2O,能将Cu2+还原至更低的价态,原因是氨气经过热分解以后得到H2、N2和NH3的混合气体,该混合气经电离、激发、解离后易得到激发态的氢分子。分析结果表明：40s的主要还原产物为Cu3O,其含氧量低于CuO,随着时间延长,亚稳相Cu3O逐渐转变成较稳定的Cu2O,当还原时间为100s,析出Cu单质。结论N2+热氨是还原性较强的气体介质。氧化铜中铜离子价态随还原时间增加而降低,同时伴随亚稳定相Cu3O向Cu2O转变现象。还原过程中高能电子对CuO颗粒有加热熔融作用,激发态的活性粒子发挥主要的还原作用。 |
| 英文摘要: |
| Objective The reduction process of CuO with atmospheric pressure plasma jet was mainly influenced by different plasma gas and reduction time. And above two influence factors were discussed in this article. Methods Plasma jet was used to scan the surface of samples. The microstructure and phase composition were studied by SEM and XRD analysis after the reduction process. Results The reduction productsconsisted of Cu4O3 and Cu3O when using N2+decomposed NH3, whose valence state was lower than other reduction product Cu2O.Because the decomposed NH3 get excited hydrogen molecules easily after ionization, inspire, dissociative. The results show that main reduction product consisted of Cu3O at 40s,whose valence state is lower than that of CuO.Metastable phase Cu3O was gradually transformed into a relatively stable phase Cu2O as time went by. With the reduction time extending, Cu was segregated as time reached to 100s.ConclusionN2+decomposed NH3 had better reducibility than other gas medium. With increasein reduction time,copper ion valence was decreased and the Cu3O phase was transformed from metastable state into a relatively stable state. During the reduction process, the high energy electrons had the heating effect on the CuO particles, and the active particles in the excited state played a major role in the reduction. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
| 关闭 |
|
|
|
渝公网安备 50010702501715号