期刊
SURFACE & COATINGS TECHNOLOGY
卷 252, 期 -, 页码 48-55出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2014.04.063
关键词
Ni-graphite coating; Supersonic atmospheric plasma spraying; Tribofilm; Friction coefficient; Wear resistance
资金
- National Natural Science Foundation of China [51202187]
- National Basic Research Program [2013CB035701]
- China Postdoctoral Science Foundation [2013M530421]
In this work, the METCO 307 (75 wt.% Ni + 25 wt.% graphite, M307) abradable seal coatings were deposited by conventional atmospheric plasma spraying system (APS) and high efficiency supersonic atmospheric plasma spraying system (SAPS), respectively. Comparative dry reciprocating sliding wear experiments on the as-sprayed coatings against a 440-C stainless steel ball were conducted on the CETR UMT-3 friction and wear tester. The results indicated that the average width and length of lubrication phase (graphite) were 3.54 +/- 0.06 and 7.51 +/- 0.13 mu m in the SAPS-coating, which were lower than 4.15 +/- 0.11 and 8.03 +/- 0.09 mu m in the APS-coating. The fine graphite phase improved the formation of homogeneous and continuous tribofilm during the reciprocating sliding friction process. The track depth of APS-coating increased from 0.093 to 0.161 mm, while that of SAPS-coating increased from 0.087 to 0.151 mm when the test temperature rose from 25 to 400 degrees C, indicating that the SAPS-coatings had a higher wear resistance. (C) 2014 Elsevier B.V. All rights reserved.
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