A5037466457- Aluminum Alloys Composites Properties
- MXene and MAX Phase Materials
- Advanced ceramic materials synthesis
- Metal and Thin Film Mechanics
- Advanced materials and composites
- Diamond and Carbon-based Materials Research
- Boron and Carbon Nanomaterials Research
- Additive Manufacturing and 3D Printing Technologies
- Semiconductor materials and devices
- Thermal properties of materials
- Intermetallics and Advanced Alloy Properties
- Laser-induced spectroscopy and plasma
- High-pressure geophysics and materials
- Heat Transfer and Optimization
- Nuclear Materials and Properties
- Advanced Materials Characterization Techniques
- Advanced Thermoelectric Materials and Devices
- Microwave Dielectric Ceramics Synthesis
- Tribology and Wear Analysis
- Catalysis and Oxidation Reactions
- 2D Materials and Applications
- Tribology and Lubrication Engineering
- Nuclear materials and radiation effects
- Advanced Surface Polishing Techniques
- Catalysis and Hydrodesulfurization Studies
RWTH Aachen University
2020-2025
Institut de Chimie de la Matière Condensée de Bordeaux
2017-2021
Thinfilm (Sweden)
2019-2021
Linköping University
2019-2021
Centre National de la Recherche Scientifique
2017-2019
University of Nebraska–Lincoln
2017-2019
Université de Bordeaux
2017-2019
Abstract Ceramic–polymer composites are of interest for designing enhanced and unique properties. However, the processing temperature windows sintering ceramics much higher than that compaction, extrusion, or polymers, thus traditionally there has been an inability to cosinter ceramic–polymer in a single step with high amounts ceramics. The cold process is low‐temperature technology recently developed ceramic‐based composites. A wide variety ceramic materials have now demonstrated be...
The oxidation of MAX phases has largely been investigated, but the effect secondary and microstructure is still unclear. We report on reactive non-reactive sintering, starting powders, microstructure, phase formation, chemical composition Cr2AlC phases. grain sizes are shown to be sensitive both processing method powders. Secondary were observed mostly in reactively sintered samples as Cr7C3 AlCr2 identified, Al contents varied between 24.4 28.0 at%. Finally, behavior produced was evaluated...
We report on the oxidation behaviour of V2AlC coatings up to 800 °C, in air. The were deposited at 580 °C using magnetron sputtering from a powder metallurgical composite target and subsequently oxidised for 5, 15 30 min. microstructural evolution samples was investigated, X-ray diffraction patterns collected track formation oxides. first indications appear after just min 500 as V-based oxides grew surface coatings. Later, presence mostly ternary (V, Al)-oxides observed starting 5 600 °C....
TiBx thin films with a B content of 1.43 ≤ x 2.70 were synthesized using high-power impulse magnetron sputtering (HiPIMS) and direct-current (DCMS). HiPIMS allows compositions ranging from understoichiometric to overstoichiometric dense B/Ti ratio between 2.06, while DCMS yields 2.20 2.70. Excess in results hardness up 37.7 ± 0.8 GPa, attributed the formation an amorphous B-rich tissue phase interlacing stoichiometric TiB2 columnar structures. We furthermore show that TiB1.43 by HiPIMS,...
Metastable Cr 2 C was formed upon Al extraction from AlC MAX phase thin films using Cu as a getter material.
In this work, we demonstrate that ultraviolet (UV) laser photolysis of hydrocarbon species alters the flame chemistry such it promotes diamond growth rate and film quality. Optical emission spectroscopy laser-induced fluorescence direct UV irradiation a diamond-forming combustion produces large amount reactive play critical roles in growth, thereby leading to enhanced growth. The is more than doubled, quality improved by 4.2%. Investigation nucleation process suggests time significantly...
Proof of concept for contactless tracking phase transitions and grain growth in self-reporting ceramic Cr–Al–B coatings by resistivity measurements. The results are verified state-of-the-art situ ex methods.
Abstract Autonomous health tracking of coated components via electrical resistance measurements requires physical connections between coating and readout. Here, the proof concept for contactless decomposition in autonomous self‐reporting Cr‐Al‐B coatings is demonstrated. Contactless‐monitored changes Cr 0.34 Al 0.31 B 0.35 reveal 2 AlB 3 4 to CrB . Comparison contactless‐measured data with situ ex high‐resolution scanning transmission electron microscopy, as well X‐ray diffraction...
Abstract The influence of sputtering parameters on the size distribution silver (Ag) nanoparticles (NP) synthesized by onto castor oil and polyethylene glycol (PEG600) was investigated. sputtered species arriving at substrate were described in terms flux kinetic energy. In both liquids, about 99% NPs measured ≤ 5 nm diameter, with most range 1-2 1-2.5 PEG600 oil, respectively. Overall, larger obtained than (40-55% 8-35% > 2 PEG600, respectively). grey color solutions indicated...
This work reports on sputter depositions carried out from a compound (Ti,Zr)2AlC target, whereupon Al-containing (Ti,Zr)C thin films (30-40 nm in thickness) were deposited MgO(111) and Al2O3(0001) substrates at temperatures ranging between 500 900 {\deg}C. The presence of Al within the carbide structure was evidenced by lattice parameter variations. Furthermore, chemical analyses showed that distribution throughout film thickness fairly homogeneous. Thicker (80-90 nm) same target consisted...
Nanostructured materials and nanocomposites have shown great promise for improving the efficiency of thermoelectric materials. Herein, Fe nanoparticles were imbedded into a CrN matrix by combining two physical vapor deposition approaches, namely, high-power impulse magnetron sputtering nanoparticle gun. The combination these techniques allowed formation in which remained intact without intermixing with matrix. electrical thermal transport properties investigated compared to those monolithic...
Compositionally-graded Cr2AlC coatings were deposited from composite targets with Al concentration gradients along the long-axis of targets, ranging 20.0 to 30.0 at.%, in an industrial plant. Stoichiometric by HPPMS a peak-power density 217 W/cm2 and at substrate bias potential −100 V require target at.% compensate for Al-loss induced preferential re-sputtering thermally desorption these deposition conditions. The stoichiometric coating floating can be attained segment containing 26.4 Al....
Thermal properties of metal matrix composite materials are becoming ever more relevant with the increasing demand for thermally efficient materials. In this work, thermal conductivity and heat transfers at interfaces copper reinforced diamond particles (Cu/D) discussed. The contain either ZrC or TiC interphases exhibit, respectively, higher lower conductivities respect to their pure Cu/D counterparts. These accounted presence strong covalent bonds increased relative densities. role these is...
A (Mo0.24Cr0.76)0.40Al0.32B0.28 thin film was deposited by direct current magnetron sputtering at 600 °C substrate temperature. Analysis X-ray diffraction, energy-dispersive spectroscopy, elastic recoil detection analysis, and high-resolution scanning transmission electron microscopy revealed the formation of previously unreported (Mo,Cr)2AlB2 MAB phase, along with Cr3AlB4, CrB4, Mo, in good agreement density functional theory (DFT) calculations. Hence, phase family Mo-Cr-Al-B system is...
In this work, the influence of ultraviolet (UV) laser photolysis hydrocarbons on combustion chemical vapor deposition diamond films was investigated at 193 and 248 nm. Although output fluence nm 1 order magnitude lower than that laser, UV irradiations led to similar enhancement growth: a 2-fold increase in rate 3% quality compared those obtained without irradiation. situ thermionic measurement emission currents revealed nucleation time reduced from 9.5 min irradiation 4.2 7.0 min,...