Publications de Mehdi Mazaheri

High/room temperature mechanical properties of 3Y-TZP/CNTs composites

Spark Plasma Sintering (SPS) method was practiced, in the current investigation, to obtain fully dense materials with an excellent dispersion of MWCNTs (Multi-walled Carbon Nanotubes) within the matrix. Scanning and transmission electron microscopy microgr ...

Elsevier Sci Ltd2014

Processing and Consolidation of TaC/HfC Based Composites Using MoSi2 and Carbon Nanotubes

Mehdi Mazaheri

Tantalum and hafnium carbides are classified as Ultra High Temperature Ceramics (UHTC) because of their extreme melting temperatures (above 3900 degrees C). Therefore, these materials can safely operate in the range of temperature that any other materials ...

Trans Tech Publications Ltd2013

High Temperature Behavior of Nano-Structured Ceramic Composites Studied by Mechanical Spectroscopy

Mehdi Mazaheri

Silicon nitride based ceramics (SiAlONs); tetragonal polycrystalline zirconia (3Y‐TZP); alumina and their composites reinforced with different amount of multi‐ walled carbon‐nanotubes (CNTs) have been processed by Spark Plasma Sintering (SPS). High tempera ...

EPFL2013

Effect of Ca substitution on crystal structure and superconducting properties of ferromagnetic superconductor RuSr2-xCaxGd1.4Ce0.6Cu2O10-delta

Henrik Moodysson Rønnow, Neda Nikseresht Ghanepour, Mehdi Mazaheri

We have investigated the effect of Ca substitution for Sr site on structural, magnetic and superconducting properties of RuSr2-xCaxGd1.4Ce0.6Cu2O10-delta system. In this system, the magnetic coupling of RuO2 and CuO2 plays an important role in magnetic and ...

Elsevier2012

Sintering behavior of nano alumina powder shaped by pressure filtration

Mehdi Mazaheri

In the present study, the sintering behavior of a commercial nano alumina powder with an initial particle size of 100 nm was investigated. The shrinkage response of the powder formed by pressure filtration (PF) during non-isothermal sintering was measured ...

2011

Multi-walled carbon nanotube/nanostructured zirconia composites: Outstanding mechanical properties in a wide range of temperature

Robert Schaller, Daniele Mari, Gilbert Fantozzi, Mehdi Mazaheri

Multi-walled carbon nanotube (MWCNT)/nanostructured zirconia composites with a homogenous distribution of different MWCNT quantities (ranging within 0.5-5 wt.%) were developed. By using Spark Plasma Sintering we succeeded in preserving the MWCNTs firmly at ...

Elsevier2011

High-Temperature Mechanical Spectroscopy of Nitrogen-Rich Ca-alpha-SiAlON Ceramics

Robert Schaller, Daniele Mari, Mehdi Mazaheri

Nitrogen-rich Ca-alpha-SiAlON ceramics made with different starting powder compositions have been studied by high-temperature mechanical spectroscopy in parallel with compressive deformation in a spark plasma sintering equipment. The mechanical loss spectr ...

2011

The effect of processing conditions on the microstructure and impact behavior of melt infiltrated Al/SiCp composites

Mehdi Mazaheri

In the current research, pressureless melt infiltration (PM!) was applied to study the effect of different processing conditions on the final properties of Al/SiC composites, fabricated through the infiltration of aluminum melt into SiC particulates porous ...

Elsevier2011

Sintering behavior of an ultrafine alumina powder shaped by pressure filtration and dry pressing

Mehdi Mazaheri

Master sintering curve (MSC) was used as a practical approach to analyse the sintering behavior of an ultrafine alumina powder. Non-isothermal sintering was carried out at three heating rates. The concept of the MSC has been used to investigate the effect ...

2010

Enhanced electrical conductivity of ultrafine-grained 8Y(2)O(3) stabilized ZrO2 produced by two-step sintering technique

Mehdi Mazaheri

Two-step sintering of nanocrystalline zirconia powder stabilized with 8 mol% yttria resulted in remarkable enhancement of the electrical conductivity and significant suppression of the accelerated grain growth. The electrical conductivity of the nearly ful ...

2010

Reverse precipitation synthesis and characterization of CeO2 nanopowder

Mehdi Mazaheri

In the present work, CeO2 nanopowder was synthesized via a reverse precipitation method using CeCl3 center dot 7H(2)O, NH4OH and sodium dodecyl sulfate as raw materials. The effect of thermal treatment on the crystal growth, surface area and chemical bonds ...

2010

High temperature mechanical spectroscopy of yttria stabilized zirconia reinforced with carbon nanotubes

Robert Schaller, Daniele Mari, Mehdi Mazaheri

High temperature mechanical properties of zirconia reinforced with carbon-nanotubes (CNTs) are studied by mechanical spectroscopy. CNTs limit zirconia grain-boundary sliding (GBS) and consequently deformation. Concurrent grain-growth and plastic deformatio ...

Wiley2010