Synthesis of ultrafine zirconium carbide particles by SHS in an Al–Zr–C system: Microstructural evaluation and formation mode
| Autor: | Yu Long, Ran Maowu, Mousheng Song |
|---|---|
| Rok vydání: | 2013 |
| Předmět: |
Morphology (linguistics)
Materials science Engineering structures Mechanical Engineering Metallurgy Metals and Alloys Nanoparticle Chemical synthesis Diluent Zirconium carbide chemistry.chemical_compound chemistry Chemical engineering Mechanics of Materials Phase (matter) X-ray crystallography Materials Chemistry |
| Zdroj: | Journal of Alloys and Compounds. 564:20-26 |
| ISSN: | 0925-8388 |
| Popis: | Due to exhibiting the desirable mechanical and chemical properties, ZrC is widely applied as the multifunctional materials related to reinforced-particulates, engineering structures and electrical devices. Using self-propagating reaction technique, the ultrafine even nanosized ZrC particles were in situ fabricated in an Al–Zr–C powders with 30 and 40 wt.% Al contents, but the ZrC-forming reaction failed to be triggered at 50 wt.% Al content. The Microstructural characteristics of synthesized as-products, coupled with the formation mode of ZrC phase, was considered together. The results reveal that the ZrC particles size is highly influenced by Al content in the compact. For 30 wt.% Al content, the size is about 150 nm, while for 40 wt.% Al content, the clean ZrC nanoparticles with well-developed morphology is about 60 nm. The reaction–precipitation mechanism is responsible for the formation of ultrafine ZrC particles. DTA analysis, combined with the water-quenched treatment during SHS, strictly demonstrated the reaction habit of Al–Zr–C system. It is accepted that the reaction between Al and Zr to form ZrAl3 phase initially take place, and then the reaction between molten ZrAl3 phase and C to synthesize ZrC phase is followed. Al has been playing an important role in controlling the reaction habit of Al–Zr–C system, not only serving as a diluent to inhibit the ZrC particles from coarsening, but also as an intermediate reactant to participate in the total reaction process. |
| Databáze: | OpenAIRE |
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