Activated sintering of refractory borides
| Autor: | G. L. Zhunkovskii, V. A. Kotenko, O. N. Grigor'ev, P. V. Mazur, T. M. Evtushok |
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| Rok vydání: | 2011 |
| Předmět: |
Zirconium
Materials science Metallurgy Metals and Alloys Sintering Recrystallization (metallurgy) chemistry.chemical_element Condensed Matter Physics Tungsten borides chemistry.chemical_compound chemistry Mechanics of Materials Boride Materials Chemistry Ceramics and Composites Melting point Wetting Eutectic system |
| Zdroj: | Powder Metallurgy and Metal Ceramics. 50:212-216 |
| ISSN: | 1573-9066 1068-1302 |
| DOI: | 10.1007/s11106-011-9320-2 |
| Popis: | The interaction of titanium, zirconium, and tungsten borides with chromium is studied. It is shown that the process is induced by contact melting involving intensive wetting of borides with interaction products at temperatures much lower than the melting points of components. The temperature dependences of contact angles and the phase constitution of interaction products are analyzed. Chromium vapors that reduce the strength of chemical bonds in the lattice lead to a liquid eutectic phase with low contact angles to the surface of borides and promote the activated sintering of boride systems. It is demonstrated that low-porous (1–2%) borides can form at sintering temperatures lower than the temperature of secondary recrystallization. The dependence of bending and compressive strength on sintering temperature is examined. Conditions for producing low-porous fine-grained materials are determined. |
| Databáze: | OpenAIRE |
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