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Journal of Chinese Society for Corrosion and protection  2025, Vol. 45 Issue (6): 1717-1724    DOI: 10.11902/1005.4537.2025.054
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Effect of PVB Addition on Microstructure and Oxidation Resistance of Silicide Coatings on TZM Mo-alloy by Slurry Method
LONG Jiayi1, WANG Li1(), ZHAO Weiguo1, HAN Jiayu1, WANG Qingsong1, LIU Hailong1, GAO Lili1, HU Ping1(), FENG Pengfa2
1 National and Local Joint Engineering Research Center for Functional Materials Processing, School of Metallurgical Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
2 Jinduicheng Molybdenum Industry Co. Ltd. , Xi'an 710077, China
Cite this article: 

LONG Jiayi, WANG Li, ZHAO Weiguo, HAN Jiayu, WANG Qingsong, LIU Hailong, GAO Lili, HU Ping, FENG Pengfa. Effect of PVB Addition on Microstructure and Oxidation Resistance of Silicide Coatings on TZM Mo-alloy by Slurry Method. Journal of Chinese Society for Corrosion and protection, 2025, 45(6): 1717-1724.

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Abstract  

Silicide coating is often used as the main component of oxidation resistance coating on Mo-alloy due to the formation of SiO2 glass phase during high temperature service. At present, slurry method is widely used to prepare silicide coating on Mo-alloy surface due to easy operation and no-need for large equipment. However, the binder content in slurry method and its effect on the microstructure and oxidation resistance of the coating are still unclear. In this paper, silicide coatings with different binder contents were prepared on TZM Mo-alloy surface by slurry sintering method. The microstructure and phase composition of silicide coatings prepared with different binder PVB contents were studied by scanning electron microscopy (SEM) and X-ray diffraction (XRD), and then the oxidation resistance of Mo-alloy with coating was examined in air at 1000, 1100 and 1200 oC for 1 h respectively. The results showed that with the increase of PVB content in the range of 2% to 10%, the number and width of cracks of the prepared coatings decreased, correspondingly the weight loss of the coatings induced by high temperature oxidation is alleviated. However, when the PVB content exceeds than 10%, there is no significant improvement in crack formation and the weight loss. In summary, the optimal effect is achieved when the PVB content is 10%.
Key words:  molybdenum alloy      slurry method      PVB binder      silicide coating      oxidation resistance     
Received:  19 February 2025      32134.14.1005.4537.2025.054
ZTFLH:  TG174  
Fund: National Natural Science Foundation of China(52404410);National Natural Science Foundation of China(52374401);National Natural Science Foundation of China(52404409);Shaanxi Basic Research Program of Natural Science(2024JC-YBQN-0367);Shaanxi Key Research and Development Program(2024QCYKXJ-116);General Special Project of Scientific Research Program of Shaanxi Provincial Department of Education(24JK0515);Xi'an Science and Technology Program(24ZDCYJSGG0043)
Corresponding Authors:  WANG Li, E-mail: 13269528303@163.comHU Ping, E-mail: huping@xauat.edu.cn
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LONG Jiayi
WANG Li
ZHAO Weiguo
HAN Jiayu
WANG Qingsong
LIU Hailong
GAO Lili
HU Ping
FENG Pengfa

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https://www.jcscp.org/EN/10.11902/1005.4537.2025.054     OR     https://www.jcscp.org/EN/Y2025/V45/I6/1717

Fig.1  Surface SEM morphologies and enlarged images of the coatings prepared from the precursor slurries containing 2% (a1, a2), 10% (b1, b2) and 20% (c1, c2) PVB
Fig.2  Cross-sectional morphologies of the coatings prepared from the precursor slurries containing 2% (a), 10% (b) and 20% (c) PVB
Fig.3  Composition analysis results of the coatings prepared from the precursor slurries containing 2% (a), 5% (b),10% (c), 15% (d), 20% (e) and 30% (f) of PVB after oxidation at 1000 oC
Fig.4  XPS results of the coating prepared from the precursor slurry containing 10% PVB before and after oxidation at 1000 oC: (a) full spectrum, (b) Si 2p, (c) O 1s, (d) Mo 3d
Fig.5  Mass losses of the coatings prepared from the precursor slurries containing different contents of PVB after oxidation at 1000, 1100 and 1200 oC
Fig.6  XRD patterns of the coatings prepared from the precursor slurries containing 2%, 10%, 20% and 30%PVB before (a) and after (b) oxidation at 1000 oC for 1 h
Fig.7  Contents of Si and Mn in the coatings prepared from the precursor slurries containing different contents of PVB, and mass losses after oxidation at 1000 oC for 1 h
Fig.8  Mechanism diagrams of the influence of PVB on the oxidation behavior of silicide coating: (a1-c1) before oxidation, (a2-c2) after oxidation
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