EUROPEAN CONGRESS AND EXHIBITION ON ADVANCED MATERIALS AND PROCESSES - EUROMAT 2021

Efficient joining materials and characterization techniques are of critical importance for the integration of ceramics in high performance structures.
This talk will overview several issues occurring when measuring the shear strength of joined ceramics and ways to overcome them.
An important topic relevant to the use of joined ceramics and composites to themselves or to other materials is...

The influence of the various content of the multilayered graphene (MLG) on the structural and mechanical properties of the final bulk porous silicon nitride-zirconia (Si3N4-ZrO2) based ceramics was investigated. The ceramic composites were prepared in the form of the laminated structure with different (5-30-5 wt% and 30-5-30 wt%) MLG content by hot isostatic pressing. ZrO2 particles were...

This study reports the first experimental evidence of the violation of the classical law for grain growth in twinned boron carbide ceramics. Grain-growth kinetics is drastically dependent on the presence of twin steps at the grain boundaries in B4C ceramics sintered by spark plasma sintering. The conjunction of high temperature gradients with large compressive stress when a pulse electric...

This study is shown as an example of the potential of synchrotron X-ray refraction technique to determine the evolution of damage in brittle (microcracked) materials. The strength of X-ray refraction resides in its high detectability of features (e.g., cracks, pores) within large volumes, enabling a macroscopic characterization of the microstructure. The case study is a Zirconia-based cast...

With the continuous miniaturization and increasingly performance requirements of microelectronic devices, new materials have been integrated as the low-k SiOC:H dielectric, introduced in the interconnections. This low dielectric constant material was developed by introducing porosities, which reversely have negatively affected its mechanical properties. Thus, product reliability becomes a...

Porous anodizing has recently attracted great interest as a simple and inexpensive method to produce nanostructured materials. By varying the anodizing conditions, the structure of the formed porous anodic Al oxide can be tuned and subsequently functionalized, making it highly attractive for various industrial applications from nanoscale electronics and optoelectronics to template, catalysts...

One of the research tasks for piezoresistive sensing and applications (e.g. healthcare monitoring, electronic skin, human–machine interfaces, and soft robotics) is the realization of efficient processing methods that allow both sensitivity at low and high strains [1]. Here we present such a processing method relying on extrusion involving thermoplastic polyurethane (TPU) and/or olefin block...

The behavior of ceramics at the nanometer scale strongly differs from the one of the corresponding bulk material. For instance, strong plastic deformation has recently been reported in isolated nanometer-sized alumina nanoparticles or MgO nanocubes, when tested in situ in a transmission electron microscope (TEM). This plastic behavior may also occur in a powder during the compaction process,...

Diamond foils are known to be exceptionally strong yet brittle. One approach to make ceramic foils less susceptible to brittle fracture is to introduce interfaces into the material that provide pathways for crack deflection. In this study, we were able to produce strong yet tough diamond/metal laminates (DMLs) with an outstanding performance from freestanding diamond foils using a brazing...

As new energy efficiency regulations tighten in the building sector, the required thickness for insulation with conventional materials (glass wool, polymeric foams...) may become prohibitive. This is a strong driving force for the development of a new class of products, the Super-Insulation at Atmospheric Pressure (SIAP) materials, based on the use of silica aerogel. Silica aerogels are...

Bioactive-element doped hydroxyapatite bioceramic (dHAp) powders were successfully prepared from different calcium precursors, using wet chemical precipitation method. The bioactive ions were incorporated into the hydroxyapatite crystals by adding appropriate amount of chloride salts of Mg2+, Sr2+ and Zn2+ ions into the base solution and they were co-precipitated with the calcium phosphate...

Novel eco-friendly method of preparation of Al2O3-AlN (AlON) composite ceramics was investigated using Hot isostatic pressing (HIP) technique. AlON ceramics are being investigated since 1980’s for their high strength and optical properties. Traditional synthesis of AlON ceramics include reactive sintering, carbothermal synthesis or spark plasma sintering. However, these technologies fail...

Polymer composites as high-performance materials are widely used and very specific for numerous applications. In building science, connecting and sealing joints with particle-filled thermoset polymers is a beneficial option due to its high mechanical properties and the ability to customize. It is therefore important to systematically predict the future performance depending on deviations...

The fabrication of heterostructures consisting of one-dimensional (1D) and two-dimensional (2D) nanomaterials, based on top-down and bottom-up approaches, as well as their functionalization processes, have drawn much attention over the last decade. Carbon nanotubes (CNTs) and graphene are the most widely studied carbon allotropes that represent the 1D and 2D nanostructures, respectively....

Carbon-based hybrid materials are an important class of artificial materials with potential applications in various fields ranging from energy storage (e.g. harvesting) to recycling applications (e.g. smart debonding). For this reason, both their synthesis process and the assessment of their properties are of high interest. Herein, we present a brief summary of recent developments in the area...

Carbon-based nanomaterials have been proven to be cutting-edge filler materials with advanced thermal and electrical properties, while their nanodimensions facilitate the development of defect—free mechanically robust crystal structures. Their strong hexagonal sp2 lattice allows free electron mobility in plane as well as thermal transport. In particular, carbon nanotubes (CNTs) and graphene,...

Carbon nanostructures and specifically nanotubes (CNTs) are materials of significant importance in nanotechnology. They have a wide range of applications ranging from automotive to aeronautics, due to their exceptional mechanical properties such as strength and stiffness-to-density/weight ratio. The synthesis of CNTs includes a variety of methods amongst which the chemical vapor deposition...

Surface diffusion is crucial for many physical and chemical processes, including epitaxial growth of crystals and heterogeneous catalysis. Although the phenomenon is common [1] and theoretically understood, measuring adatom migration barriers on 2D materials remains a daunting challenge. We are able to estimate the carbon adatom migration barrier on freestanding monolayer graphene, which has...

Spectroscopic techniques are one of the key steps in the characterization of novel nanomaterials and composites. In the case of infrared spectroscopy, however, there is one particular challenge that complicates its application to these materials, compared to the simpler analysis of homogeneous media: the need to account for the influence of material topology in the effective electromagnetic...

Silicon nitride (SiNx) and hydrogenated silicon nitride (SiNx:H) thin films have widespread applications, including passivation films for semiconductor devices in microelectronics industry or antireflective layers for solar cells. The most common deposition techniques of SiNx:H thin films are different types of chemical vapor deposition methods, such as plasma enhanced chemical vapor...

Graphene materials are competitive candidates as electrodes of supercapacitors and other energy storage devices due to their high specific surface area, electrical conductivity and stability. Either heteroatoms doping or incorporation with metal/metal oxides have been reported effective in further improving the capacitive performance of graphene-based electrodes. In this study, a low...

Materials with the DyMn2O5 structure type have immense potential for novel physical properties, but they remain largely unexplored. In this research, the isostructural SmFe1-xCrxTiO5 (x = 0-1) compounds were synthesized by the ceramic method. We thoroughly investigated their magnetic properties as well as possible photocatalytic applications. The crystal structure of these materials can be...