Speaker
Description
Locally reinforced metal matrix composites (MMCs) are one of the most promising materials suitable to manufacture metallic parts with high wear resistivity. Currently MMCs can be produced by ex-situ and in-situ methods. For liquid-assisted techniques, the main phenomena determining the structure and properties of MMCs are wettability and reactivity. In this study, high temperature interaction (1350°C, argon atmosphere) between molten iron-based alloys (grey cast irons) and selected reactive ceramic substrates (graphite + titanium) was examined by the sessile drop method coupled. Non-contact heating of Fe-alloy/substrate couples was applied while the drops were deposited on the substrate by squeezing molten alloy from a capillary situated above the substrate. Real-time wetting behaviour was recorded using high-resolution high-speed CCD camera. These tests evidenced a good wetting and fast infiltration of molten Fe-alloy inside Ti-containing graphite substrates. The solidified drop/substrate couples were subjected to detailed structural characterization by light microscopy and scanning electron microscopy coupled with energy dispersive X-ray spectroscopy. These observations revealed the reactively formed transition region between the solidified drop and the substrate. For comparison, the same tests were performed under the same testing conditions with oxide-based substrates (Al2O3, ZrO2). The results obtained are discussed in terms of specific and principal differences between ex-situ and in-situ routes used for synthesis of Fe-based metal matrix composites by liquid-assisted processes.
This work was performed in the frame of The National Centre for Research and Development (NCBR) research project No. LIDER/49/0200/L-11/19/NCBR/2020
| Speaker Country | Poland |
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