刘鲁,刘亚,吴长军,吴昱锋,苏旭平.预氧化处理对MP35N合金高温氧化行为的影响[J].表面技术,2024,53(2):60-70.
LIU Lu,LIU Ya,WU Changjun,WU Yufeng,SU Xuping.Effect of Pre-oxidation Treatment on High Temperature Oxidation Behavior of MP35N Alloy[J].Surface Technology,2024,53(2):60-70 |
| 预氧化处理对MP35N合金高温氧化行为的影响 |
| Effect of Pre-oxidation Treatment on High Temperature Oxidation Behavior of MP35N Alloy |
| 投稿时间：2022-11-15 修订日期：2023-05-09 |
| DOI：10.16490/j.cnki.issn.1001-3660.2024.02.005 |
| 中文关键词: MP35N Co-Ni-20Cr合金 预氧化 Al2O3氧化膜 氧化机制 表面改性 |
| 英文关键词:MP35N Co-Ni-20Cr alloy pre-oxidation Al2O3 oxide film oxidation mechanism surface modification |
| 基金项目:国家自然科学基金(52271005,51871030);江苏省教育厅高等学校自然科学研究重大项目(17KJA430001) |
|
|
| Author | Institution |
| LIU Lu | Jiangsu Key Laboratory of Materials Surface Science and Technology, Jiangsu Changzhou 213164, China |
| LIU Ya | Jiangsu Key Laboratory of Materials Surface Science and Technology, Jiangsu Changzhou 213164, China;Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering, Changzhou University, Jiangsu Changzhou 213164, China |
| WU Changjun | Jiangsu Key Laboratory of Materials Surface Science and Technology, Jiangsu Changzhou 213164, China |
| WU Yufeng | Jiangsu Key Laboratory of Materials Surface Science and Technology, Jiangsu Changzhou 213164, China |
| SU Xuping | Jiangsu Key Laboratory of Materials Surface Science and Technology, Jiangsu Changzhou 213164, China;Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering, Changzhou University, Jiangsu Changzhou 213164, China |
|
| 摘要点击次数: |
| 全文下载次数: |
| 中文摘要: |
| 目的 探索并优化合金成分、工艺以获得致密稳定的预氧化膜，提高合金抗氧化能力。方法 利用非自耗真空电弧炉熔炼合金，在真空容器中加热金属及其氧化物粉末获得平衡氧压。通过莱茵装置进行预氧化实验。通过FactSage计算Co-Ni-Cr-Mo-Al-Si体系的合金组织相图及其氧化相图，利用X射线衍射(XRD)和扫描电子显微镜对预氧化的试样进行物相分析。结果 在1 000 ℃、10–17 atm氧压下预氧化，未含Si的MP35N合金表面出现Cr2O3氧化物;随着Si添加量的增加，表面氧化物变为(Al,Cr)2O3，以Cr2O3为主，内氧化物为Al2O3;当Si含量(质量分数)为3%时，内部形成了近乎连续的带状Al2O3氧化膜。在1 000 ℃、10–25 atm氧压下，合金表面形成连续的Al2O3膜;在1 000 ℃、10–17 atm氧压下，Co-Ni-20Cr-10Mo-4Al-1Si合金预氧化后的外氧化膜为Cr2O3，内氧化物为Al2O3;随着氧压的提高，在空气气氛下合金表面生成尖晶石相氧化物。在1 000 ℃、10–17 atm氧压下预氧化1、5、10 h，Co-Ni-20Cr-10Mo-4Al-1Si合金表面外氧化膜为Cr2O3，内氧化物为Al2O3，随着时间延长至20 h，合金表面形成连续的Al2O3膜。结论 随着Si添加量的增加，Al元素的活度不断升高，从而提高了Al2O3的形成驱动力，提升了Al元素的扩散系数，有更多的Al元素扩散至合金表层，有利于Al元素的选择性氧化。预氧化氧压的降低和氧化时间的延长，有利于保护性外氧化Al2O3膜形成，可有效提高合金的抗高温氧化性能。 |
| 英文摘要: |
| In order to prepare the pre-oxidation film with good high temperature oxidation resistance, the nonconsumable vacuum arc furnace was used to melt the alloy, and the alloy samples were cut into 10 mm×10 mm×1 mm thin sheets for pre-grinding and polishing after annealing at 1 000 ℃ in the box furnace for 7 days. The Rhine apparatus was used for pre-oxidation experiment. The balanced oxygen pressure was obtained by heating metal and its oxide powder in a vacuum container. The oxygen pressure in the quartz tube was 1.9×10–3 Pa, and then heat treatment was conducted in a double temperature tube furnace. The effect of Si element on the activity of Al element was calculated by pandat software. The alloy structure phase diagram and oxidation phase diagram of Co-Ni-Cr-Mo-Al-Si system were calculated by FactSage software. The morphology, chemical composition and element distribution of the oxidation film surface and section of the pre-oxidation sample were characterized and the phase was analyzed by X-ray diffraction and scanning electron microscope. At 1 000 ℃ under oxygen pressure of 10–17 atm oxygen pressure, Cr2O3 oxide appeared on the surface of MP35N alloy without Si. With the increase of Si addition in the alloy, the surface oxide of the alloy became (Al,Cr)2O3, mainly composed of Cr2O3 oxide, and the internal oxide was Al2O3. When the content was 3%, a nearly continuous band-shaped Al2O3 oxide film was formed inside. Under the oxygen pressure of 10–25 atm, continuous Al2O3 film was formed on the alloy surface. Under the oxygen pressure of 10–17 atm, the outer oxide film of the Co-Ni-20Cr-10Mo-4Al-1Si alloy after pre-oxidation was Cr2O3, and the inner oxide was Al2O3. With the increase of oxygen pressure, spinel phase oxides were formed on the surface in the air. After pre-oxidation for 1 h, 5 h and 10 h at 1 000 ℃ and 10–17 atm oxygen pressure, the external oxide film on the surface of Co-Ni-20Cr-10Mo-4Al-1Si alloy was Cr2O3, and the internal oxide was Al2O3. With the extension of time, the coarse Cr2O3 particles on the surface transformed into dense Cr2O3 oxide film. Al2O3 gradually became continuous from the acicular oxide at the initial stage of oxidation and the oxide layer became thicker. When the pre-oxidation time was extended to 20 h, the outer layer of Cr2O3 film completely peeled off, and the alloy surface formed a continuous external oxidation Al2O3 film. The Si-containing alloys formed an additional SiO2 layer at the scale-alloy interface, effectively reducing Cr2O3 growth rate and Cr depletion in the underlying alloy. With the increase of Si addition, the activity of Al element increased continuously, which promoted the formation driving force of Al2O3 and the diffusion coefficient of Al element, and more Al element diffused to the surface of the alloy. At the same time, the addition of Si promoted the nucleation of metastable and stable alumina, which contributed to the selective oxidation of aluminum, so that continuous metastable and stable alumina oxide scales could be rapidly formed. At the same time, stable Al2O3 precipitation was formed at the interface of internal oxidation alloy, which slowed down the development of external nickel rich layer. The reduction of pre-oxidation oxygen pressure and the extension of oxidation time are conducive to the formation of protective external oxidation Al2O3 film, which can effectively improve the high temperature oxidation resistance and corrosion resistance of the alloy. |
| 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