STEM analysis of WC-Co coatings modified by nano-sized TiC and nano-sized WC addition
| Autor: | J. Wiedermann, Hanna Myalska, Radosław Swadźba, Krzysztof Szymański, Grzegorz Moskal, R. Rozmus |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
020502 materials Metallurgy Sintering chemistry.chemical_element 02 engineering and technology Surfaces and Interfaces General Chemistry Tungsten engineering.material 021001 nanoscience & nanotechnology Condensed Matter Physics Surfaces Coatings and Films Carbide 0205 materials engineering chemistry Coating Materials Chemistry engineering 0210 nano-technology Thermal spraying Dissolution Cobalt Solid solution |
| Zdroj: | Surface and Coatings Technology. 318:279-287 |
| ISSN: | 0257-8972 |
| DOI: | 10.1016/j.surfcoat.2017.01.072 |
| Popis: | Thermally sprayed hardmetal WC-Co-based coatings are widely applied in order to provide good wear resistance to mechanical components working in demanding environment. The WC-Co coatings are obtained by various spraying methods such as High Velocity Oxygen Fuel (HVOF) or High Velocity Air Fuel (HVAF) techniques. Additional improvement of coatings' properties can be achieved by adding very fine carbides to the WC-Co powder feedstock. The usual approach is the agglomeration and sintering of submicron-sized carbides without or with micro-sized carbides (bimodal distribution). In this work, WC-Co powders were modified by blending them with 5 wt% nano-sized TiC ( 0.9 W 0.1 by selected area electronic diffraction, was detected. W dissolution effect was observed to be lower in the case of nano-sized TiC-added coatings. Microstructural investigation by STEM indirectly indicates that nano-sized WC completely dissolved in the cobalt matrix, inducing solid solution of tungsten in cobalt formation in the 5 wt% WC-added coating. The formation of new phases containing Ti, except TiC, was not found in the coating. Obtained results suggest that nano-sized TiC may increase the stability of metallic matrix microstructure in a WC-Co-based coating. |
| Databáze: | OpenAIRE |
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