Effect of W content on the ablation properties of W-ZrC composites synthesized by reactive melt infiltration under oxyacetylene flame
| Autor: | Yujin Wang, Sijia Huo, Guiming Song, Dong Wang, Yu Zhou, Boxin Wei |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Thermal shock
Materials science 020502 materials Alloy Composite number Oxide chemistry.chemical_element 02 engineering and technology Tungsten engineering.material 021001 nanoscience & nanotechnology Evaporation (deposition) Carbide chemistry.chemical_compound 0205 materials engineering chemistry engineering Composite material 0210 nano-technology Porosity |
| Zdroj: | International Journal of Refractory Metals and Hard Materials. 74:28-39 |
| ISSN: | 0263-4368 |
| DOI: | 10.1016/j.ijrmhm.2018.02.020 |
| Popis: | W-ZrC composites with different W contents from 48 to 68 vol% have been produced by reactive melt infiltration of molten Zr2Cu alloy into porous preforms from partially-carburized W powders at 1300 °C for 1 h in vacuum. The influence of W content on ablation behavior and properties was evaluated under oxyacetylene flame conditions. When W content is above 50 vol%, the W-ZrC composites withstood the thermal shock at the early ablation stage. The linear and mass ablation rates of the 68 vol% W-ZrC composite without residual tungsten carbides are 0.8 μm·s−1 and 3.5 mg·s−1, respectively, tested at 2600 °C for 120 s. Such a performance is attributed to the evaporation of WO3 and residual Cu and the formation of protective ZrO2-rich oxide layers on the ablated surfaces of the composites. The ablation of W-ZrC composites is mainly caused by the thermo-chemical oxidation as well as thermo-mechanical erosion of the formed oxides. |
| Databáze: | OpenAIRE |
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