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電沉積結(jié)合包埋滲制備復(fù)合涂層的高溫氧化行為
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廣西大學(xué)

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國家自然科學(xué)基金（51371059）；廣西自然科學(xué)基金（2016GXNSFDA380022）；廣西高等學(xué)校高水平創(chuàng)新團(tuán)隊(duì)項(xiàng)目（第二批）；廣西科技重大專項(xiàng)（桂科AA18118030，AA17204100）；廣西有色金屬及特色材料加工重點(diǎn)實(shí)驗(yàn)室基金（GXYSSF1804）


High Temperature Oxidation Behavior of Composite Coatings Prepared by Electrodeposition Combined with Pack Cementation
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National Natural Science Foundation of China (51371059); Guangxi Natural Science Foundation (2016GXNSFDA380022); High Level Innovation Team and Outstanding Scholar Program in Guangxi Colleges (the second batch); Major Science and Technology Projects in Guangxi (Guike AA18118030, AA17204100); Guangxi Non-ferrous Metals and Specialty Materials Processing Focus Laboratory Fund (GXYSSF1804)

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    摘要:

    為了提高鈮合金的高溫抗氧化性能，首先采用陰極勻速旋轉(zhuǎn)電沉積法在鈮合金表面制備了鉬層，然后通過包埋滲硅獲得硅化物復(fù)合涂層。研究了沉積態(tài)鉬層和硅化物涂層的形成和微觀組織結(jié)構(gòu)，對(duì)比分析了有或無涂層C103合金的高溫氧化行為。結(jié)果表明，陰極勻速旋轉(zhuǎn)法使沉積的電流效率提高一倍多，鉬層呈胞狀結(jié)構(gòu)、以非晶形式存在。經(jīng)包埋滲硅后，生成了表層以MoSi2為主、中間層為NbSi2的復(fù)合涂層，涂層與基體結(jié)合良好。經(jīng)1200 ℃氧化后，涂層試樣的氧化拋物線速率常數(shù)分別為1.83×10-2 mg2cm-4h-1、8.08 mg2cm-4h-1，與之相比，裸合金的氧化拋物線速率常數(shù)則為5.87×103 mg2cm-4h-1，而且僅氧化10 h裸合金即出現(xiàn)了嚴(yán)重粉化；在高溫氧化過程中，復(fù)合涂層表面生成SiO2垢層，具有優(yōu)良的抗高溫氧化性能。

    Abstract:

    In order to improve the high temperature oxidation resistance of niobium alloy, a molybdenum layer was firstly prepared on the surface of niobium alloy by electrodeposition method with uniform rotating cathode, and then the silicide composite coatings were obtained by the halide activated pack siliconizing. The formation and microstructure of as-deposited molybdenum layer and silicide coating were studied, and the high temperature oxidation behavior of C103 alloy with or without coating was compared and analyzed. The results showed that the current efficiency during electrodeposition was twice as high as that by conventional electrodeposition. The prepared molybdenum layer was amorphous with a cellular structure. After pack siliconizing, mainly MoSi2 and NbSi2 predominated the surface layer and intermediate layer of the composite coatings, respectively, and the composite coatings exhibited a strong interfacial bonding to the substrate. Thermally exposed to 1200 °C, the coated samples showed parabolic rate constants of 1.83×10-2 mg2cm-4h-1 and 8.08 mg2cm-4h-1, respectively. By comparison, a higher parabolic rate constant about 5.87×103 mg2cm-4h-1 was detected in the bare alloy, and pesting oxidation was found in the bare alloy only 10 h exposure. The composite coatings present excellent resistance to high temperature oxidation due to the formation of SiO2 surface scales during thermal exposure.

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楊維維,張有才,雷聲遠(yuǎn),凌奎,趙小蓮,李偉洲.電沉積結(jié)合包埋滲制備復(fù)合涂層的高溫氧化行為[J].稀有金屬材料與工程,2022,51(5):1797~1804.[yangweiwei, zhangyoucai, leishengyuan, lingkui, zhaoxiaolian, liweizhou. High Temperature Oxidation Behavior of Composite Coatings Prepared by Electrodeposition Combined with Pack Cementation[J]. Rare Metal Materials and Engineering,2022,51(5):1797~1804.]
DOI：10.12442/j. issn.1002-185X.20210408

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  • 收稿日期:2021-05-09
  • 最后修改日期:2021-06-18
  • 錄用日期:2021-06-22
  • 在線發(fā)布日期: 2022-06-09
  • 出版日期: 2022-05-30