Effect of Graphite Addition on Structure and Properties of Ti(CN) Coatings Deposited by Reactive Plasma Spraying
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- 作者：Pengbo Mi ; Jining He ; Hongjian Zhao ; Zenglei Ni…
- 关键词：microstructure ; mechanical properties ; reactive plasma spraying ; Ti(CN) coatings ; tribological properties
- 刊名：Journal of Thermal Spray Technology
- 出版年：2016
- 出版时间：December 2016
- 年：2016
- 卷：25
- 期：8
- 页码：1588-1595
- 全文大小：
- 刊物类别：Chemistry and Materials Science
- 刊物主题：Surfaces and Interfaces, Thin Films; Tribology, Corrosion and Coatings; Characterization and Evaluation of Materials; Operating Procedures, Materials Treatment; Analytical Chemistry;
- 出版者：Springer US
- ISSN：1544-1016
- 卷排序：25
文摘
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, CNx, 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.