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金属学报  1996, Vol. 32 Issue (2): 180-186    
  论文 本期目录 | 过刊浏览 |
Ni-La_2O_3复合镀层对Ni抗高温循环氧化性能的影响
彭晓;李铁藩;李美栓;马信清;平德海
中国科学院金属腐蚀与防护研究所腐蚀与防护国家重点实验室;中国科学院金属研究所固体原子像开放研究实验室
EFFECT OF Ni-La_2O_3 ELECTRODEPOSITED COMPOSITE FILM ON THERMAL CYCLING OXIDATION OF Ni
PENG Xiao; LITiefan; LI Meishuan; MA Xinqing; PING Dehai(State Key Laboratory of Corrosion and Protection; Institute of Corrosion and Protection of Metals; Chinese Academy of Sciences; Shenyang 110015)(Laboratory of Atomic Imaging of Solids; Institute of Metal Reserch; Chinese Academy of Sciences; Shenyang 110015)(Manuscript received 1995-06-07; in revised form 1995-10-06)
引用本文:

彭晓;李铁藩;李美栓;马信清;平德海. Ni-La_2O_3复合镀层对Ni抗高温循环氧化性能的影响[J]. 金属学报, 1996, 32(2): 180-186.
, , , , . EFFECT OF Ni-La_2O_3 ELECTRODEPOSITED COMPOSITE FILM ON THERMAL CYCLING OXIDATION OF Ni[J]. Acta Metall Sin, 1996, 32(2): 180-186.

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摘要: 1273K循环氧化100h的实验结果表明,金属Ni表面沉积一层Ni-La_2O_3复合镀层(厚为30μm)后,抗循环氧化性能比金属Ni和表面沉积相同厚度Ni镀层的金属Ni有极大改善。Ni及其单镀Ni后,氧化速率快,氧化皮严重开裂;沉积复合镀层后,氧化速率显著降低,表面氧化层晶粒明显细化,氧化皮下发生开裂电子探针(EPMA)观测发现,La_2O_3分布在氧化层(50μm厚)的上表层(31μm厚)中。高分辨电子显微镜(HREM)发现复合镀层中分布着尺寸<5nm的La_2O_3纳米颗粒,据此提出,氧化时,由于小尺寸的La_2O_3纳米颗粒易部分溶解,成为产生并在氧化层晶界偏聚的La~(3+)的"储存池"。La~(3+)在NiO晶界偏聚,阻止了Ni~(2+)的短路扩散,改善了复合镀层氧化层的生长机制和力学性质.
关键词 复合镀层NiLa_2O_3循环氧化    
Abstract:The thermal cycling oxidation resistance of Ni with a Ni-La_2O_3 electrodeposited composite film of 30 μm in thickness is significantly improved in comparison to Ni with and without Ni-plating for 100 h-cyclic oxidation at 1273 K. The rapid growth and severe cracking of scale-on Ni with or without Ni-plating occurred during the thermal cycling process, but the application of Ni-La_2O_3 electrodeposited composite film on Ni resulted in a markable reduction of NiO growth and the scale has finer grain, non-cracking morphology. Electron probe microanalyses revealed that in the total NiO scale with an average thickness of about 50 μm, La_2O_3 was located in the region of about 31 μm near the scale / gas interface. High resolution electron microscopy showed that in the codeposited film La_2O_3 nanoparticles below 5 nm is in the dispersive or cluster state- Therefore, it is proposed that the modification of oxidation mechanism and mechanical property of the scale of Ni With Ni-La_2O_3 electrodeposited composite film may resulted from the partial dissolution of La_2O_3 with nano-size, and the segregation of La~(3+) at the NiO grain boundaries, which prevent the short distance diffusion of Ni~(2+).(Correspondent. PENG Xiao, Institute of Corrosion and Protection of Metals, Chinese Academy of Sciences,Shenyang 110015)
Key words electrodeposited composite film    Ni    La_2O_3    thermal cycling oxidation
收稿日期: 1996-02-18     
基金资助:国家自然科学基金
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