Three different spark plasma sintering (SPS) treatments were applied to highly sinteractive, near-stoichiometric UO2.04 nanocrystalline (5 nm) powders produced by U(IV) oxalate hydrothermal decomposition at 170 °C. The conditions for reaching 95 % theoretical density (TD) in regular SPS, high pressure SPS (HP-SPS), and, the first time, two-step (2S-SPS), determined. Densification TD was achieve...

Abstract Dense ceramics of Na3xLa2/3−xZrO3−δ with orthorhombic (Pnma) perovskite structure have been prepared by spark plasma sintering (SPS) to investigate their Na+ ion conducting behaviors combining crystal chemistry. Despite suppressed Na volatilization owing the SPS technique, component tends be partially lost during sintering, and consequently, chemical composition is limited a small rang...

Zn4Sb3 is among the cheapest high performance thermoelectric materials, and it is made of relatively nontoxic elements. Strong activities are aimed at developing commercial power generation modules based on Zn4Sb3 making it vital to develop fast reliable synthesis processes for high-quality material. Here direct synthesis and compaction of homogeneous phase-pure thermoelectric Zn4Sb3 by spark p...

The effects of lithium doping on the sintering and grain growth of non-stoichiometric nano-sized magnesium aluminate spinel were studied using a spark plasma sintering (SPS) apparatus. Li-doped nano-MgO·nAl₂O₃ spinel (n = 1.06 and 1.21) powders containing 0, 0.20, 0.50 or 1.00 at. % Li were synthesized by the solution combustion method and dense specimens were processed using a SPS apparatus at...

Tungsten-heavy alloys (WHA) are a pseudo-alloy in which tungsten is the primary phase and remains filled with additives such as Ni–Fe Ni–Cu. These widely used to make their applications’ structural, electrical, electronic components. According this study, addition processing factors, prime factors affecting performance of WHAs microstructural features matrix composition, powders shapes sizes, d...

Although titanium/hydroxyapatite composite is an attractive material for dental implants, it would be more useful if it could be produced as a functionally graded material (FGM). In this paper, microstructure and microhardness of a five-layer titanium/hydroxyapatite functionally graded material has been investigated. First, titanium and hydroxyapatite (HA) powders were mixed with the Ti to HA v...

In this study, carbide-forming metallic additives (W, Mo, Cr, Ti) were introduced into the copper matrix to improve wettability of diamond particles in copper–diamond composites. The samples prepared by Spark Plasma Sintering (SPS) and Hot Pressing (HP) at 920 °C. phase composition, microstructure thermal conductivity investigated. influence additive concentration, sintering method as well natu...

Compared to batteries and electrochemical capacitors, dielectric capacitors are widely studied because of their huge advantages in terms charging/discharging speed power density. In this work, high-entropy (Bi0.2Na0.2Sr0.2Ba0.2Ca0.2)TiO3 lead-free relaxor-ferroelectric ceramics were prepared by both conventional sintering (CS) spark plasma (SPS). The results showed that the ceramic SPS obtained...

A BN-TiB2-TiN composite was produced via reactive sintering of the hexagonal BN (hBN) with 20 wt% Ti. Spark plasma (SPS) used as fabrication method and sample characterized by X-ray diffractometry, energy-dispersive spectroscopy, scanning electron microscopy. According to results, Ti utterly consumed during SPS, led in-situ TiB2 TiN0.9 formations. Additionally, microstructural study revealed nu...

Magnesium (Mg) has been paid attention to the viewpoint of weight reduction structural materials. However, Mg alloys fabricated by ingot metallurgy process have limited applications as materials due their low mechanical property and corrosion resistance. In this research, novel Mg-Al alloy was synthesized alloying-spark plasma sintering (MA-SPS) process. Vickers hardness test X-ray diffraction ...