Self-healing and high-temperature oxidation of nano-Ni dispersed Al2O3 hybrid materials

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Self-healing short-circuits in organic light-emitting diodes and solar cells

Organic materials open the way for large-scale applications of Organic Light-Emitting Diodes (OLED) and solar cells (OPV). These materials can be large-scale processed using printing and coating on rigid and flexible substrates. The resulting devices can therefore be fabricated at low cost for various applications. Production yields suffer,...

Healing particles in self-healing thermal barrier coatings

Crack healing in ceramic thermal barrier coatings (TBCs) may be realized by embedding Mo-Si based particles in the thermal barrier coating. Upon cracking, these particles are exposed to oxygen that permeates through the top layer and the crack gap is filled with SiO2 which is produced from oxidation at high temperature. Due to its amorphous...

Methodology to evaluate availability of self-healing agent for structural ceramics

Simple methodorogy to evaluate availability of self-healing agent have been established from the investigation on the relationship between oxidation behavior of self-healing agent and self-healing phenomena. The consistency of the established methodology was discussed by comparison in the lower bound of the available temperature range of mullite...

Self-healing of yttrium-doped CR2ALC MAX phase coatings deposited by hipims

Self-healing materials allow for a design concept based on damage management where damage that is inflicted during operation can be healed autonomously. It has been shown that the Mn+1AXn phases Ti3AlC2, Ti2AlC and Cr2AlC exhibit autonomous self-healing behaviour. Cracks are filled and hence healed by oxidation products of the M and A elements...

Atmospheric methane removal by methane-oxidizing bacteria immobilized on porous building materials

Biological treatment using Methane Oxidizing Bacteria (MOB) immobilized on carrier materials is considered as the best solution to mitigate methane emission at low concentrations (e.g., in animal houses). The porosity of the support is one of the most important factors for an efficient removal of methane. In animal houses, building materials...

Self-healing behavior of fiber-reinforced self-healing ceramics

The alumina fiber reinforced alumina containing the interlayer of SiC as healing agent was found to have self-healing ability for the delimitation of the fiber/matrix interface. Main crack in the composite is branched to fiber/matrix interface when the main crack reached the interface, because the interlayer has lower strength than those of the...

Oxidation induced crack healing of CR2(AL,SI)C MAX phase ceramic

The oxidation crack healing of Cr2AlC and Cr2(Al,Si)C was studied and compared with known healing of Ti2AlC. The oxidation induced crack healing of Ti2AlC is relatively fast and leads to full strength recovery, but the oxidation product contains besides ?-Al2O3 also undesired TiO2. However, when oxidizing Cr2AlC only ?-Al2O3 is formed, but full...

A conceptual study into the potential of MAX-phase ceramics for self-healing of crack damage

The reduction of maintenance and replacement work costs is an important driving force in the development of high temperature materials (T>800 °C) that can autonomously heal damage as a result of local cracks. In recent years some potential routes involving the addition of sacrificial particles have been identified, yet these systems have the...

Self crack healing induced by high temperature oxidation in SiN/SiC nano-laminated film

In bulk, Si3N4 reinforced by dispersing SiC particle has superior self crack healing ability at high temperature. In consideration with this fact, SiN/SiC nano-laminated film is expected to exhibit the self crack healing at high temperature. In this study, we investigated the self crack healing behavior of the SiN/SiC nano-laminated film...

The effect of SiC particle size on the healing efficiency of alumina at high temperatures

Structural ceramics like alumina are usually brittle and sensitive to flaws leading to a reduction in their mechanical properties. This situation is worsened by machining prior to service and during service by contact, which introduces micro cracks and hidden damages. Crack damage can easily be developed in such ceramics when loaded, which often...

Crack-healing effect of AL2O3 hybrid materials dispersed with Ni nanoparticles via thermal oxidation

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A CSP-Based Skeletal Mechanism Generation Procedure: Auto-Ignition and Premixed Laminar flames in n-Heptane/Air Mixtures

We use a procedure based on the decomposition into fast and slow dynamical components offered by the Computational Singular Perturbation (CSP) method to generate automatically skeletal kinetic mechanisms for the simplification of the kinetics of n-heptane oxidation. The detailed mechanism of the n-heptane oxidation here considered has been...

A comprehensive multi-scale approach for vapor-phase synthesis of metal oxide

Synthesis of metal oxide nano- and micro-sized particles by chemical vapor-phase route is a technologically and commercially competitive process. Linking reactor operation parameters to the particle properties represents the most critical task in designing such processes. A multi-scale modelling approach applied to industrial and laboratory...