Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第22卷    第10期    总第163期    2012年10月

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文章编号:1004-0609(2012)10-2839-07
镍基合金表面二硅化钼复合涂层的制备和性能
颜建辉1,李益民2,张厚安3,唐思文1,许剑光1,刘龙飞1

(1. 湖南科技大学 先进材料制备及应用技术研究所,湘潭 411201;
2. 中南大学 粉末冶金国家重点实验室,长沙 410083;
3. 厦门理工学院 材料科学与工程系,厦门 361024
)

摘 要: 为了改善K403镍基高温合金的高温抗氧化性能,采用大气等离子喷涂在镍基合金表面制备了4种不同结构的MoSi2复合涂层。结果表明:4种结构涂层中K403/NiCoCrAlY/ZrO2/30%(体积分数)ZrO2-MoSi2/MoSi2复合涂层的抗热震性能最好,且该涂层的界面结合强度最高(22.5 MPa)。MoSi2涂层的自身结合强度大于涂层界面结合强度,结合机理以机械咬合式为主。该复合涂层在1 200 ℃氧化120 h后的质量增加仅为3.42 mg/cm2,提高K403合金和传统氧化锆涂层的抗氧化性能。MoSi2复合涂层表面在高温时生成了一层致密的SiO2保护膜,阻碍了氧的扩散,减轻了过渡层NiCoCrAlY/ZrO2界面处的氧化。

 

关键字: 镍基合金;二硅化钼;复合涂层;组织;性能

Preparation and properties of molybdenum disilicide composites coatings on surface of nickel-based alloy
YAN Jian-hui1, LI Yi-min2, ZHANG Hou-an3, TANG Si-wen1, XU Jian-guang1, LIU Long-fei1

1. Advanced Materials Synthesis and Application Technology Institute,
Hunan University of Science and Technology, Xiangtan 411201, China;
2. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;
3. Department of Material Science and Engineering, Xiamen University of Technology, Xiamen 361024, China

Abstract:In order to improve the oxidation resistance of nickel-based alloy at high temperature, four kinds of MoSi2 composite coatings were successfully prepared on the nickel-based alloys surface by air plasma spraying. The results indicate that the thermal shock resistance and the adhesion strength (22.5 MPa) of K403/NiCoCrAlY/ZrO2/30%(volume fraction)ZrO2-MoSi2/MoSi2 composites coating are the best among the four kinds of coatings. The self-bonding strength of MoSi2 coating is greater than the interfacial bond strength of the composites coating, and the bond mechanism is mechanical bond with bite combination. The mass increment is only 3.42 mg/cm2 when MoSi2 composites coating is oxidized at 1 200 ℃ for 120 h. Compared with the nickle-based alloy and the conventional thermal barrier coating, the oxidation resistance of the MoSi2 composites coating is improved. During the high-temperature oxidation process, a dense SiO2 layer is formed on the surface of the MoSi2 coating,which hinder the diffusion of oxygen. The oxidation degree of the boundary between the NiCoCrAlY and zirconia ceramic is relieved.

 

Key words: nickel-based alloy; molybdenum disilicide; composites coating; microstructure; properties

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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