Title of article :
Fabrication of iron nitride coatings by reactive RF plasma spraying
Author/Authors :
Yamada، نويسنده , , Motohiro and Kouzaki، نويسنده , , Yoshihisa and Yasui، نويسنده , , Toshiaki and Fukumoto، نويسنده , , Masahiro، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2006
Pages :
7
From page :
1745
To page :
1751
Abstract :
Reactive plasma spraying is a promising process to fabricate thick non-oxide ceramics coatings. In this study, fabrication of iron nitride (Fe4N) coatings by reactive RF (Radio Frequency) plasma spraying was investigated. Iron particles were injected in Ar/N2 plasma and were deposited onto carbon steel substrates. In the case of applying conventional iron powder (particle size of 75 μm and under), it was possible to fabricate Fe/Fe4N composite coatings by reactive RF plasma spraying with using water-cooled substrate holder. However, the microstructure of the coatings was porous and lower concentration of the nitride phase. Moreover, it was difficult to increase the concentration of the nitride phase in the coatings by controlling spraying conditions such as N2 flow rate and RF power. On the other hand, it was possible to fabricate thick, dense microstructure and higher concentration of the nitride phase with applying fine iron powder as a feedstock powder material. And it was possible to control the concentration of the nitride phase in the coatings by changing N2 flow rate in the plasma gas. Moreover, the coating which did not include original Fe phase was also fabricated with the spraying condition of higher N2 flow rate. However, excessive N2 flow rate and RF power decrease the nitride phase due to increasing both in plasma and substrate temperature above the decomposition temperature of Fe4N (974 K). Therefore, fabrication of iron nitride coatings by reactive RF plasma spraying was possible with applying fine iron powder and substrate cooling.
Keywords :
Nitride ceramics , Iron nitride , Radio frequency plasma , Thermal Spray , reactive plasma spraying
Journal title :
Surface and Coatings Technology
Serial Year :
2006
Journal title :
Surface and Coatings Technology
Record number :
1813338
Link To Document :
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