A5015644165- Advanced ceramic materials synthesis
- Advanced materials and composites
- Ferroelectric and Piezoelectric Materials
- Aluminum Alloys Composites Properties
- Microwave Dielectric Ceramics Synthesis
- MXene and MAX Phase Materials
- High Entropy Alloys Studies
- Metal and Thin Film Mechanics
- Semiconductor materials and devices
- Multiferroics and related materials
- Advanced Thermoelectric Materials and Devices
- Nuclear materials and radiation effects
- Intermetallics and Advanced Alloy Properties
- Acoustic Wave Resonator Technologies
- Advancements in Solid Oxide Fuel Cells
- Dielectric properties of ceramics
- Bone Tissue Engineering Materials
- X-ray Diffraction in Crystallography
- Chemical Reaction Mechanisms
- Crystallization and Solubility Studies
- Electronic Packaging and Soldering Technologies
- Advanced Surface Polishing Techniques
- Graphene research and applications
- Electromagnetic Effects on Materials
- Additive Manufacturing and 3D Printing Technologies
Queen Mary University of London
2016-2025
Nanoforce Technology (United Kingdom)
2014-2023
Dartmouth Hospital
2003
Flash sintering (FS) is an energy efficient technique involving electrical Joule heating, which allows very rapid densification (<60 s) of particulate materials. Since the first publication on flash-sintered zirconia (3YSZ) in 2010, it has been intensively researched and applied to a wide range Going back more than century ago, we have found close similarity between FS oxides Nernst glowers developed 1897. This review provides comprehensive overview based literature survey consisting 88...
This paper reports the electrochemical, optical and thermal effects occurring during flash sintering of 8 mol % yttria-stabilized zirconia (8YSZ). In-situ observations polycrystalline single crystal specimens revealed electrochemical blackening/darkening an incubation period prior to sintering. The phenomenon is induced by cathodic partial reduction under DC fields. When using a low frequency AC field (0.1⁻10 Hz) blackening reversible, following imposed polarity switching. Thermal imaging...
This paper presents a thorough study of the strain response different types electroceramics during dynamical electrical loading. It highlights important aspects to take into account in experimental methodology and outlines general guidelines for discussion interpretation results. The contributions piezoelectric effect, electrostriction ferroelectric/ferroelastic domain switching produced application an alternating electric field are discussed by describing strain-electric (S-E) loops...
Pure ZrB 2 powder was Flash sintered in an SPS furnace ( FSPS ). The samples were densified up to 95.0% 35 s under applied pressure of 16 MPa. Compared Conventional CSPS ), the newly developed technique resulted unprecedented energy and time savings about 95% 98% respectively. monoliths obtained by compared with respect microstructures, densification behavior, grain growth. methodology might find application a wide range highly conductive ceramics as such refractory borides carbides.
Abstract The properties of graphene open new opportunities for the fabrication composites exhibiting unique structural and functional capabilities. However, to achieve this goal we should build materials with carefully designed architectures. Here, describe ceramic-graphene by combining foams pre-ceramic polymers spark plasma sintering. result is a material containing an interconnected, microscopic network very thin (20–30 nm), electrically conductive, carbon interfaces. This generates...
A novel processing methodology that allows combined preheating and Flash‐ SPS ( FSPS ) of silicon carbide‐based materials has been developed. Beta‐SiC (+10 wt% B 4 C) powders were densified (Ф 20 mm) up to 96% their theoretical density in 17 s under an applied pressure 16 MP a (5 kN ). The flash event was attributed the sharp positive temperature dependence electrical conductivity (thermal runaway) SiC, sudden increase electric power absorption (Joule heating) samples after sufficient...
The classical view of the structural changes that occur at ferroelectric transition in perovskite-structured systems, such as BaTiO3, is polarization occurs due to off-center displacement B-site cations. Here, we show bismuth sodium titanate (BNT)-based composition 0.2(Ba0.4Sr0.6TiO3)–0.8(Bi0.5Na0.5TiO3), this model does not accurately describe situation. Such BNT-based systems are interest lead-free alternatives currently used materials a variety piezo-/ferroelectric applications. A...
Abstract Accelerating perovskite solid solution discovery and sustainable synthesis is crucial for addressing challenges in wireless communication biosensors. However, the vast array of chemical compositions their dependence on factors such as crystal structure, sintering temperature require time-consuming manual processes. To overcome these constraints, we introduce an automated materials approach encompassing machine learning (ML) assisted material screening, robotic synthesis,...
A novel processing route that induces simultaneous densification and texturing of SiC ceramics by Flash Spark Plasma Sintering (FSPS) is reported. Unlike hot forging (which produces in a direction orthogonal to the load as result plastic deformation), FSPS produced parallel pressing direction. The was driven thermal gradient generated within sample along its axial due higher electrical resistivity compared graphite punch (the midthickness hotter than surfaces contact with punches). In FSPSed...
Flash joining of CVD-SiC coated Cf/SiC samples with a Ti interlayer was achieved using Spark Plasma Sintering machine. The influence different heating powers and discharge times were investigated. sample flash joined at maximum power 2.2 kW (peak electric current 370 A) within 7 s showed the highest apparent shear strength 31.4 MPa, which corresponds to interlaminar composites. A temperature ∼1237 °C reached during joining. An extremely rapid rate 9600 °C/min combined very short processing...
This paper presents a novel derivative of flash sintering, in which contactless sintering (CFS) is achieved using plasma electrodes. In this setup, electrical contact with the sample to be sintered made by two arc electrodes, one on either side, allowing current pass through sample. opens up possibility continuous throughput sintering. Preheating, usual precondition for provided electrodes heat 1400 °C. The best results were produced pre-compacted samples (bars 1.8 mm thick) pure B4C...
Composition modification by doping and solid solution is a well-studied strategy in thermoelectric (TE) materials to optimise their properties. Recently, the concept of entropy stabilization has offered possibility forming random solutions that have properties go beyond rule mixture. In this study, we prepared series high-entropy half-Heusler (HEHHs) with varying valence electron counts (VEC), (Ti0.33Zr0.33Hf0.33)1-x(V0.33Nb0.33Ta0.33)xCoSb (x = 0.5 0.75). Compared medium- low-entropy...
Abstract The reverse piezoelectric effect allows for the conversion of an electrical input signal into mechanical displacement and forms basis operation positioners actuators. Addressing practical need cost-effective sensitive materials, we introduce erbium-doped lead magnesium niobium titanate ceramics which exhibit exceptionally high strain (3.19% bipolar 0.8% unipolar) under a very low applied field 2 kV mm −1 , resulting in record-breaking coefficients ( d 33 * values 15,950 4014 pm V...
A Flash Spark Plasma Sintering (FSPS) technique was used to fully densify Magnéli phase titanium suboxides (95%TD) in 9 s. modified FSPS setup contributed produce homogeneous and dense microstructures, thus avoiding undesired residual porosity at the contact surfaces between samples electrodes. FSPSed retained original phases (Ti4O7, Ti5O9 Ti6O11) of starting powder, whereas Ti4O7 disappeared those densified using Conventional (CSPS). Compared CSPSed samples, ones possessed higher...
The quaternary AgPb18SbTe20 compound (abbreviated as LAST) is a prominent thermoelectric material with good performance. Endotaxially embedded nanoscale Ag-rich precipitates contribute significantly to decreased lattice thermal conductivity (κlatt) in LAST alloys. In this work, Ag alloys was completely replaced by the more economically available Cu. Herein, we conscientiously investigated different routes of synthesizing CuPb18SbTe20 after vacuum-sealed-tube melt processing, including (i)...