期刊
SURFACE & COATINGS TECHNOLOGY
卷 203, 期 8, 页码 1094-1100出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2008.10.013
关键词
High velocity erosion; Chromium carbide (Cr3C2); High velocity thermal spray coating; Heat treatment
资金
- WOKA GmbH
- Metal Spray Suppliers (NZ) Ltd
- Holster Engineering (NZ) Ltd
- Material Performance Technologies (NZ)
- The University of Auckland
In Part 1 of this two part series the variation in erosion mechanisms as a function of as-sprayed coating microstructure was presented. The oxidation resistance of Cr3C2-NiCr coatings means that they are used in high temperature applications where WC-Co based systems are no longer suitable. High temperature exposure has been shown to generate microstructural development in these coatings, leading to variations in coating hardness. In this work the effect of such coating development on the high velocity erosion response is investigated. The HVAF and HVOF coatings of Part I were heat treated for up to 30 days at 900 degrees C to generate a range of coating microstructures up to steady state. Erosion was performed under the same conditions as in Part 1. Heat treatment increased the ductility of the NiCr phase, enabling ductile erosion deformation to occur. Intersplat sintering reduced the significance of splat based erosion mechanisms and forced mass loss to become dictated by the phase microstructure. Such developments improved the quantified erosion resistance of both coating systems relative to the as-sprayed conditions. The coating microhardness was shown to be a poor indicator of erosion response across the range of coating microstructures investigated. (C) 2008 Elsevier B.V. All rights reserved.
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