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中南大学学报(自然科学版)

Journal of Central South University

第47卷    第3期    总第259期    2016年3月

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文章编号:1672-7207(2016)03-0730-11
扩散阻挡层对NiCrAlYSi涂层不同条件下热腐蚀行为的影响
许安1,杨阳1,李伟洲1, 2,秦泽华1,岑广1,刘会群2,易丹青2

(1. 广西大学材料科学与工程学院,广西南宁,530004;
2. 中南大学材料科学与工程学院,湖南长沙,410083
)

摘 要: 利用电弧离子镀技术在DSM11合金基体上制备含或不含扩散阻挡层(diffusion barrier,DB)的NiCrAlYSi涂层,对比研究2种涂层在900 ℃恒温热腐蚀行为和从900 ℃到室温的循环热腐蚀行为(表面混合盐质量分数为75% Na2SO4+25% K2SO4)。研究结果表明:在恒温热腐蚀条件下,含或不含扩散阻挡层的NiCrAlYSi涂层表面主要生成了α-Al2O3和γ/γ′相;腐蚀100 h后,NiCrAlYSi涂层出现了较多的Kirkendall孔洞,基体与涂层元素的互扩散明显。NiCrAlYSi/DB涂层的扩散阻挡层可有效地抑止基体与涂层的元素互扩散,防护效果比单一NiCrAlYSi涂层的效果好。在循环热腐蚀条件下,含或不含扩散阻挡层的NiCrAlYSi涂层表面主要生成α-Al2O3、尖晶石、TiO2和γ/γ′相;腐蚀100 h后,NiCrAlYSi涂层内氧化和内硫化现象严重,NiCrAlYSi/DB涂层的扩散阻挡层界面易开裂,影响扩散阻挡层的效力,导致涂层体系比单一NiCrAlYSi涂层更快失效。

 

关键词: NiCrAlYSi涂层;电弧离子镀;扩散阻挡层;高温热腐蚀;应力

Influence of diffusion barrier on hot corrosion behavior of NiCrAlYSi coating under different test conditions
XU An1, YANG Yang1, LI Weizhou1, 2, QIN Zehua1, CEN Guang1, LIU Huiqun2, YI Danqing2

1. School of Materials Science and Engineering, Guangxi University, Nanning 530004, China;
2. School of Materials Science and Engineering, Central South University, Changsha 410083, China

Abstract:The NiCrAlYSi coatings with or without a diffusion barrier (DB) were prepared on a Ni-based superalloy DSM11 by arc ion plating technique. The hot corrosion behaviors of two kinds of the coatings under different conditions in molten 75% Na2SO4+25% K2SO4 (mass fraction) at 900 ℃ or 900 ℃to room temperature were investigated and compared. The results show that during the isothermal hot corrosion, α-Al2O3 and γ/γ′ phases are formed on the NiCrAlYSi coating with or without a DB. After 100 h, NiCrAlYSi coating shows Kirkendall voids and the interdiffusion between the coating and substrate is obvious. NiCrAlYSi coatingwith a DB significantly suppresses the interdiffusion between the coating and substrate, and the defending effect is better than that of NiCrAlYSi coating without a DB. During the cyclic hot corrosion, the NiCrAlYSi coating with or without a DB consists of α-Al2O3, spinels, TiO2 and γ/γ′ phases. After 100 h, NiCrAlYSi coating presents the severe internal oxidation and sulfidation. The interface of barrier layer is prone to cleavage and will reduce its efficiency, which causes the NiCrAlYSi coating with a DB to display the earlier failure than the NiCrAlYSi coating without a DB.

 

Key words: NiCrAlYSi coating; arc ion plating; diffusion barrier(DB); hot corrosion; thermal stress

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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