Effect of Graphite Addition on Structure and Properties of Ti(CN) Coatings Deposited by Reactive Plasma Spraying |
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Authors: | Pengbo Mi Jining He Hongjian Zhao Zenglei Ni Fuxing Ye |
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Affiliation: | 1.School of Materials Science and Engineering,Tianjin University,Tianjin,China;2.School of Materials Science and Engineering,Hebei University of Technology,Tianjin,China |
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Abstract: | Ti(CN) coatings with graphite addition ranging from 0 to 50 wt.% were prepared using reactive plasma spraying technology and their microstructure, mechanical, and tribological properties were investigated using scanning and transmission electron microscopy, x-ray diffraction analysis, x-ray photoelectron spectroscopy, Vickers microhardness testing, and block-on-ring wear testing. The results showed that graphite addition resulted in crystallite size refinement and an increase in the amount of amorphous phase. The Ti(CN) coatings consisted of a mixture of Ti(CN), graphite, CN x , and amorphous phases. The hardness first increased then decreased as the graphite content was increased, with a maximum of 1450 HV0.2 for 30 wt.% graphite addition. The fracture toughness decreased from 4.38 MPa m1/2 to 2.76 MPa m1/2 with increasing graphite content. The friction coefficient decreased due to unreacted graphite embedded in the matrix. Also, the wear rate first decreased then increased, with a minimum value of 2.65 × 10?6 mm3 N?1 m?1 for 30 wt.% graphite addition. The wear mechanisms of the Ti(CN) coatings included abrasive, adhesive, and oxidation wear. |
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