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Synthesis and microstructure observation of titanium carbonitride nanostructured coatings using reactive plasma spraying in atmosphere |
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| Authors: | Lin Zhu Jining HeDianran Yan Lisong XiaoYanchun Dong Jianxin ZhangHanlin Liao |
| Institution: | a School of Material Science and Engineering, Hebei University of Technology, 300130 Tianjin, PR China b Laboratoire d’Etudes et de Recherches sur les Matériaux, les Procédés et les Surfaces, Université de Technologie de Belfort-Montbéliard, Site de Sévenans, 90010 Belfort Cedex, France c Institute for Inorganic and Materials Chemistry, University of Cologne, 50939 Cologne, Germany |
| Abstract: | In the present study, nanostructured titanium carbonitride (TiCN) coatings were successfully deposited by reactive plasma spraying (RPS) technology using a self-designed gas tunnel mounted on a normal plasma spray torch. The phase composition and microstructure of the TiCN coatings were characterised by XRD, SEM and TEM. The results indicated that the main phase of the coatings was FCC TiC0.2N0.8 with a small amount of Ti3O. The coating that was deposited using 35 kW displayed better microstructure and properties. The coating exhibited a typical nanostructure including 90 nm diamertrical equiaxed grains and 400 nm long columnar grains by TEM images. The SEM observation further revealed that the equiaxed grains in parallel direction to the substrate surface in TEM images were actually the columnar grains perpendicular to the substrate surface. The formation mechanism of the nanostructured coatings was also discussed. The measured microhardness value of the coating was approximately 1659 Hv100 g, and the calculated crack extension force was about 34.9 J/m2. |
| Keywords: | Titanium carbonitride Reactive plasma spraying Nanostructured coating Microhardness Toughness |
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