Synthesis, Structure, and Properties of Diboride Solid Solutions (Hf1 – xTax)B2
Tóm tắt
Porous sintered solid solutions (Hf1 – хTaх)B2 were synthesized from elements by self-propagating high-temperature synthesis and were then ground in a ball mill to fraction d50 < 10 μm. Compacts were hot-pressed from single-phase solid solutions of various stoichiometries (Hf1 – хTaх)B2, and their structure and properties were studied. The constructed dependences of the unit cell parameters on the parameter x confirmed that they obey Vegard’s law. Analysis of the microstructure by scanning electron microscopy, transmission electron microscopy, and energy dispersive spectroscopy confirmed the existence of a region of single-phase solutions between the HfВ2 and TaB2 phases. Lamellas made of (Hf0.8Ta0.2)B2 and (Hf0.6Ta0.4)B2 compacts were studied by transmission electron microscopy. It was determined that, with an increase in the tantalum content, the size of subgrains decreases to 0.2–1 μm, which correlates with the size of coherent scattering regions. The mechanical properties of the single-phase solid solutions were measured. It was shown that the solid solutions of the compositions (Hf0.8Ta0.2)B2 and (Hf0.6Ta0.4)B2 have record-high values of hardness (63–70 GPa) and elastic modulus (550–587 GPa). The temperature dependence of the electrical resistance was constructed, and the heat capacity, thermal diffusivity, and thermal conductivity were determined in over a wide range of compositions of solid solutions (Hf1 – xTax)B2, where x = 0–0.9.
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