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    Spark plasma sintering of B4C-TiB2 composite: effect of combustion synthesized nanoparticle on sinterability and mechanical properties
    (Springer, 2025) Çoban, Ozan; Buğdaycı, Mehmet; Özer, Salih Çağrı; Başlayıcı, Serkan; Turan, Servet; Açma, Mahmut Ercan
    This study investigated the effects of fine particles with high surface area synthesized by Self-propagating High-Temperature Synthesis (SHS) on the SPS process and the properties of the resulting products. Correlations were established between particle size, SHS product addition, sinterability, and mechanical properties. The products were characterized by measuring shrinkage percentages, relative density, microhardness, elastic modulus, and fracture toughness, which were further correlated with SEM-EDS results. The results revealed that SHS nanoparticles significantly increased fracture toughness, especially with additions above 60%, by reducing average particle size, increasing powder porosity, and adding composite powder. The product exhibited high relative density (99.03%), elastic modulus (464 GPa), and fracture toughness (4.65 MPa.m1/2) when SPS was used on B4C-TiB2 powders containing 80% SHS product at a low temperature of 1550 degrees C. By adding 80% SHS product, hardness increased by 62% (19.5 GPa) and fracture toughness by 24%, even at low sintering temperatures, thus reducing energy consumption.
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    Structural features and energy harvester device applications of textured 0.675 PMN-0.325 PT piezoceramics
    (Springer, 2020) Berksoy Yavuz, Ayşe; Savacı, Umut; Turan, Servet; Alkoy, Sedat; Mensur Alkoy, Ebru
    In the current study, textured lead magnesium niobate-lead titanate solid solution with composition 0.675Pb(Mg1/3Nb2/3)O-3-0.325PbTiO(3) (0.675PMN-0.325PT) has been fabricated with 0.7 mol% manganese (Mn) doping to enhance the soft character and the figure of merit (FOM). Random and textured PMN-PT plates were prepared by tape casting where 1 vol% plate-like barium titanate (BaTiO3) single-crystal templates were added to induce texture. A detailed structural investigation using scanning/transmission electron microscopy (STEM) and precession electron diffraction techniques has been conducted to establish the orientational relationship between the PMN-PT matrix and the BT templates. The FOM of textured and doped PMN-PT was found to increase for almost fourfold compared to random undoped case. Characterization of the energy harvesting (EH) performance of unimorph EH devices indicated an over twofold increase in the output power of the doped and textured case in comparison to the undoped and random PMN-PT ceramics.