| 陈忠,蒙彩思,火克莉,张姚,郝粉利.不同条件下进行渗后扩散的铝硅涂层氧化行为研究[J].装备环境工程,2019,16(1):30-34. CHEN Zhong,MENG Cai-si,HUO Ke-li,ZHANG Yao,HAO Fen-li.Oxidation Behaviour of Al-Si Coating after Diffusion under Different Conditions[J].Equipment Environmental Engineering,2019,16(1):30-34. |
| 不同条件下进行渗后扩散的铝硅涂层氧化行为研究 |
| Oxidation Behaviour of Al-Si Coating after Diffusion under Different Conditions |
| 投稿时间：2018-11-01 修订日期：2019-01-25 |
| DOI：10.7643/ issn.1672-9242.2019.01.006 |
| 中文关键词: 铝硅涂层 氧化 SEM EDS |
| 英文关键词:Al-Si coating oxidation SEM EDS |
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| Author | Institution |
| CHEN Zhong | AECC Guiyang Precision Casting Company, Guiyang 550014, China |
| MENG Cai-si | AECC Guiyang Precision Casting Company, Guiyang 550014, China |
| HUO Ke-li | AECC Guiyang Precision Casting Company, Guiyang 550014, China |
| ZHANG Yao | AECC Guiyang Precision Casting Company, Guiyang 550014, China |
| HAO Fen-li | AECC Guiyang Precision Casting Company, Guiyang 550014, China |
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| 中文摘要: |
| 目的 提高铝硅涂层的抗氧化性能。方法 采用料浆法在DZ417G定向凝固镍基高温合金叶片的燃气流道表面制备铝硅防护涂层，通过扫描电子显微镜（SEM）分析不同条件下进行渗后扩散的铝硅涂层表面显微组织形貌和截面显微组织形貌。结果 无保护气氛下进行渗后扩散处理的铝硅涂层，在扩散过程中就已经发生了氧化，氧化过程首先形成多孔非致密结构的θ-Al2O3相，随着氧化过程的进行，θ-Al2O3相逐渐转变成致密结构的α-Al2O3相，从而起到真正的抗氧化作用。结论 铝硅涂层中的Al元素提前被消耗，对铝硅涂层的使用寿命存在一定影响，因而渗后扩散须保证在真空条件下或有保护气氛条件下进行，使叶片表面渗后的铝浓度达到一定的要求，从而在使用过程中可以生成致密结构的α-Al2O3相，起到抗氧化作用，提高叶片的使用寿命。 |
| 英文摘要: |
| Objective To improve the oxidation resistance of Al-Si coating. Methods Al-Si protective coatings were prepared on the gas flowing surface of directional freezing DZ417G Ni-superalloy blade by slurry method. The surface microstructure and cross-sectional microstructure of the coatings were analyzed by scanning electron microscopy (SEM). Results In the diffusion process of Al-Si coating without protective atmosphere, the porous and non-dense phase of θ-Al2O3 was formed firstly. With the oxidation process proceeding, θ-Al2O3 phase gradually transformed into dense structure of α-Al2O3 phase, which had the real oxidation resistance. Conclusion The Al element in the Al-Si coating is consumed in advance, which has certain influence on the service life of the Al-Si coating. Therefore, diffusion process after infiltration must be carried out in vacuum or in protective atmosphere. Then the Al concentration can meet requirement and α-Al2O3 phase can form in the application process for oxidation resistance and thus improve the service life of the blade. |
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