期刊
WEAR
卷 309, 期 1-2, 页码 96-111出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.wear.2013.11.001
关键词
Sliding wear; High temperature; Thermal spray coatings; Hardmetal coatings; Indentation; Nanoindentation
资金
- Regione Emilia Romagna (Italy), Net-Lab INTERMECH MO.RE
Recent studies of HVOF-sprayed WC-(W,Cr)(2)C-Ni coatings indicated an applicability at temperatures above 600 degrees C. Therefore, in the present paper the dry sliding wear behaviour of coatings prepared from one selected feedstock powder was studied up to 750 degrees C and compared to a WC-10%Co-4%Cr coating as reference. Coatings were prepared onto stainless steel substrates by a liquid-fueled high velocity oxygen-fuel (HVOF) spray process. A Cr-W-Ni-C mixed matrix phase and chromium-rich large (W,Cr)(2)C grains were formed as a result of metallurgical reactions between the components WC, Cr3C2 and Ni during spraying; therefore, the resulting coating can be better designated as WC-(W,Cr)(2)C-Ni. The dry unidirectional sliding wear behaviour of the coatings, studied according to ASTM G99 against Al2O3 counterbodies at four different temperatures (25 degrees C, 400 degrees C, 600 degrees C, 750 degrees C) and at two sliding speeds, was interpreted on the basis of their microstructure, micromechanical properties and oxidation behaviour. The morphology and composition inside the wear scars were also studied by SEM and micro-Raman spectroscopy. The results show that the WC-(W,Cr)(2)C-Ni coating exhibits good wear resistance up to 750 degrees C, whereas WC-CoCr, in spite of its very mild wear at low temperature, suffers from catastrophic oxidation at 750 degrees C. (C) 2013 Elsevier B.V. All rights reserved.
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