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赵三团,张相召,刘桂武,Valenza Fabrizio,Muolo Maria Luigia,乔冠军,Passerone Alberto.SiC陶瓷表面Mo-Ni-Si金属化及其与Ag的润湿性研究[J].稀有金属材料与工程(英文),2018,47(3):759~765.[Zhao Santuan,Zhang Xiangzhao,Liu Guiwu,Valenza Fabrizio,Muolo Maria Luigia,Qiao Guanjun and Passerone Alberto.Surface Metallization of SiC Ceramic by Mo-Ni-Si Coatings for improving its wettability by molten Ag[J].Rare Metal Materials and Engineering,2018,47(3):759~765.]
Surface Metallization of SiC Ceramic by Mo-Ni-Si Coatings for improving its wettability by molten Ag
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Received:March 24, 2016  Revised:May 13, 2016
DOI:
Key words: surface metallization  coating  SiC  wetting  interface
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Zhao Santuan,Zhang Xiangzhao,Liu Guiwu,Valenza Fabrizio,Muolo Maria Luigia,Qiao Guanjun and Passerone Alberto  
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Abstract:
      Three Mo-Ni-Si metallizing coatings with various chemical compositions were deposited on SiC ceramic substrates by vacuum fusion sintering process, and the phase compositions of the coatings and their interface microstructure were analyzed. The wetting and spreading of molten Ag on the coated SiC ceramic substrates were investigated by the sessile drop technique, and the interfacial behavior of the Ag/coated SiC systems was analyzed and discussed. The experimental results showed that the coatings were mainly composed of Mo5Si3, MoSi2, Ni2Si, NiSi2 and MoNiSi. The tetragonal MoSi2 grains located on the coating surface disappeared with the concentration of Mo increasing from 20 at.% to 40 at.%. The final contact angles of Ag/coated SiC systems at 1000 oC for holding 30 min were 45o, 79o and 85o for Mo20-Ni32-Si48, Mo30-Ni28-Si42 and Mo40-Ni24-Si36, respectively. This result can be closely related to the interactions between the Ag drop and the microstructure of the three Mo-Ni-Si coatings. No visible reaction layers were observed at all the coating/substrate interfaces before and after the wetting tests.