等离子喷涂制备MoSi_2-CoNiCrAlY复合涂层的高温氧化行为
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摘要
以高能球磨法制备的纳米MoSi_2-CoNiCrAlY复合粉末为喷涂材料,利用等离子喷涂技术在GH4169合金表面沉积了MoSi_2-CoNiCrAlY复合涂层,并研究了GH4169基材和复合涂层合金试样在900℃静态大气环境下的循环氧化行为。结果表明:复合涂层表现出较好的抗高温氧化性能,其氧化速率仅为1.23×10~(-7)mg~2·cm~(-4)·s~(-1),这归因于MoSi_2在氧化早期形成了SiO_2相,可以自封氧化膜。氧化后期SiO_2的脱落,Mo_5Si_3相的再次氧化生成MoO_3和MoO_2气相,以及MoSi_2的内氧化直接气化,会降低涂层的抗氧化性能。
With the ball milled nanocrystalline powders as spraying materials, MoSi_2-CoNiCrAlY composite coatings were deposited on GH4169 alloy by plasma spraying technology. The cycle oxidation behavior of coated and uncoated GH4169 alloy at 900 °C in static air was investigated. The results show that the composite coating exhibits good oxidation resistance at high temperature, and the oxidation rate is only 1.23×10~(-7) mg~2·cm~(-4)·s~(-1), which is attributed to a self-sealing oxide film SiO_2 with excellent protective properties formed at the early stage by oxidation of MoSi_2. The oxidation resistance of the coating would be reduced by the peeling of SiO_2 in the later period of oxidation and the reoxidation of Mo_5Si_3 phase to generate MoO_3 and MoO_2 gas phase as well as the internal oxidation of MoSi_2.
With the ball milled nanocrystalline powders as spraying materials, MoSi_2-CoNiCrAlY composite coatings were deposited on GH4169 alloy by plasma spraying technology. The cycle oxidation behavior of coated and uncoated GH4169 alloy at 900 °C in static air was investigated. The results show that the composite coating exhibits good oxidation resistance at high temperature, and the oxidation rate is only 1.23×10~(-7) mg~2·cm~(-4)·s~(-1), which is attributed to a self-sealing oxide film SiO_2 with excellent protective properties formed at the early stage by oxidation of MoSi_2. The oxidation resistance of the coating would be reduced by the peeling of SiO_2 in the later period of oxidation and the reoxidation of Mo_5Si_3 phase to generate MoO_3 and MoO_2 gas phase as well as the internal oxidation of MoSi_2.
引文
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[8]Mikula M,Pla?ienka D,Roch T et al.Surface&Coatings Technology[J],2016,288:203
[9]Yang Jiaoxi(杨胶溪),Zuo Tiechuan(左铁钏),Xiao Rongshi(肖荣诗).Heat Treatment of Metals(金属热处理)[J],2006,31(7):37
[10]Lan H,Yang Z G,Xia Z X et al.Corrosion Science[J],2011,53:1476
[11]Lan H,Hou P Y,Yang Z G et al.Oxidation of Metals[J],2011,75(1):77
[12]Lan Hao,Yang Zhigang,Zhang Yuduo et al.Rare metal Materials and Engineering[J],2012,41(2):194
[13]Wang Lu,Fu Qiangang,Zhao Fengling et al.Surface&Coatings Technology[J],2018,347:257
[14]Kulczyk-Malecka J,Zhang X,Carr J et al.Journal of the European Ceramic Society[J],2018,38(12):4268
[15]Nozahic F,Monceau D,Estournès C.Materials&Design[J],2016,94:444
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[17]Liu Mingtao(刘名涛),Zhong Xichun(钟喜春),Liu Zhongwu(刘仲武)et al.Journal of Materials Engineering(材料工程)[J],2014(5):17
[18]Yuan Kang,Peng Rulin,Li Xinhai et al.Surface&Coatings Technology[J],2015,261:86
[19]Hou Dangshe(侯党社),Li Kezhi(李克智),Li Hejun(李贺军)et al.Journal of Inorganic Materials(无机材料学报)[J],2008,23(2):213
[20]Paswan S,Mitra R,Roy S K.Intermetallics[J],2007,15(9):1217
[21]Mandal P,Thom A J,Kramer M J et al.Materials Science and Engineering A[J],2004,371(1-2):335
[22]Ye Dalun(叶大伦),Hu Jianhua(胡建华).Handbook of Practicality Inorganic Thermodynamics(实用无机物热力学数据手册)[M].Beijing:Metallurgical Industry Press,2002
[23]Wang Yang(王杨),Zhu Jiaqi(朱嘉琦),Dai Bing(代兵)et al.China Surface Engineering(中国表面工程)[J],2015,28(3):42
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[25]Zhu Y T,Stan M,Conzone S D et al.Journal of the American Ceramic Society[J],1999,82(10):2785