Abstract: We have reported that development of texture can be controlled by colloidal processing in
a strong magnetic field followed by heating even for diamagnetic ceramics such as alumina, titania
and so on. We demonstrate in this study that alumina/alumina laminar composites with different
crystalline-oriented layer are produced by electrophoretic deposition (EPD) in a strong magnetic field.
This composite was fabricated by alternately changing the angle between the directions of the
magnetic and electric fields layer by layer during EPD in 12T. The grains in alternate layers are
Abstract: Cathodic electrophoretic deposition of bimodal alumina suspension was performed using
conductive polypyrrole (Ppy) film as an electrode. The coating of the Ppy on nonconductive ceramic
substrates was performed by polymerization of pyrrole (Py) in an aqueous solution. The relative green
density of the deposits measured by Archimedes’ method was 68 %. Alumina ceramics were obtained
by sintering the deposits together with the Ppy coated ceramic substrates in air.
Abstract: In the present work the behaviour of HAp extracted from pig bones at elevated
temperatures up to 1000oC in O2 and CO2 atmospheres has been studied. It has been found that CO2
atmosphere arrests HAp decomposition. Chemical analysis and infrared spectroscopy reveal that no
free CaO appears and no decrease of CO3
-2 concentration groups occurs in the material calcined in
CO2 atmosphere. In the O2 atmosphere at elevated temperatures CaO and CO2 are emitted from the
samples, although the remaining material retains the HAp structure as indicated by the X-ray
Abstract: Alumina–zirconia composites Al2O3–20 vol. % yttria stabilized zirconia containing two
types of yttria stabilized zirconia: 3mol% yttria doped ZrO2 and 8mol% yttria doped ZrO2 were
consolidated very rapidly to full density by high frequency induction heating sintering (HFIHS). A
comparison between 3YSZ and 8YSZ as a second phase toughening alumina has been made. Effects
of sintering temperature on the mechanical properties have been studied. The consolidated samples
were investigated by X-ray diffraction (XRD) and scanning electron microscope (SEM). The
microhardness, strength and toughness of the composites are determined. The results showed that,
3YSZ is most effective as a second phase toughening alumina then 8YSZ. Al2O3-3YSZ composites
with higher mechanical properties and small grain size were successfully developed at relatively low
temperatures through this technique.
Abstract: Vinyl ester BisGMA [Bisphenol-A-glycidyldimethacrylate] resin has been modified by
incorporating Titanium dioxide(TiO2)nanoparticles (0.5%-2% by weight). An ultrasonic mixing
process was employed to disperse the particles into the resin system prior to casting and curing test
specimens. From TEM investigation, it is found that the particles are nano size (5-60nm) and
dispersed throughout the entire volume of the resin. Dynamic mechanical analysis was conducted
for both the neat resin and nanocomposite. In dynamic mechanical analysis, nanocomposite shows
increase in storage modulus (6%), and glass transition temperature (5.8%) from neat resin system.
Thermogravimetric analysis shows 7.5% better thermal stability. In addition, the nanocomposite
shows enhance in the stiffness by 5% in flexural loading. The Tg and flexural modulus of the
nanocomposites were enhanced as the particle volume fraction was enhanced and than decreased.
Abstract: An ultrafine-grained Al-5083 alloy reinforced with 5 vol.% nano-sized β-SiC particles was
fabricated with a powder cryomilling and consolidation technique. Tensile tests were conducted at
temperatures from 298 to 773 K for this composite. The mechanisms for deformation and fracture of
this nanostructured composite at various temperatures are discussed.
Abstract: The displacement reaction (in situ reaction) is an effective process to solve the interfacial
problem between Al matrix and ceramic particles in Al alloy matrix composites. In this study, an Al
alloy matrix composite powder containing nanometer was produced by using high energy ball
milling, and a bulk Al alloy matrix composite reinforced with nanometer and submicrometer sized
Al2O3 particles was obtained by sintering the ball milled composite powder at 950 °C for 2h. It was
found that the Al2O3 particles were homogeneously distributed in the Al matrix after sintering. Some
of the Si particles have lots of fine Al2O3 particles distributed homogeneously in the Al matrix.
The hardness of the sintered specimen produced using as-milled composite powder is higher than
that of the sintered specimen produced using as-mixed powder.
Abstract: Composites made from wood residues and biomasses, together with either conventional polymers
such as polypropylene (PP) and their recyclate streams or with the new emerging biopolymers such
as polylactic acid (PLA), were compounded and injection moulded. Mechanical properties and
biodegradation analyses were undertaken. The addition of wood flour/sander dust (SD) and wood
fibres (WF), to the PP, with suitable compatibilizer, increased the flexural and tensile modulus and
strength, indicating a good bond between the fibres and matrix. The tensile and flexural strengths
were decreased with the addition of wood fillers, additives and biomasses to a PLA biopolymer
blend. Such biomasses and additives increased the biodegradation of the PLA blend, and some
control over biodegradation rates was achievable.
Abstract: Particulate composites prepared by sintering compacts of Al2O3 and TZP powders, in air
at 1500 and 1600 oC have been characterized in terms of microstructure and mechanical properties.
The mechanical properties of the composites appear to be controlled by three main factors: the grain
size of major phase, type of intergranular TZP, and presence of residual stress.
Abstract: Four types of yarns were made from flax sliver (Linum usitatissimum) as reinforcements
in composites: (1) twist-less, (2) two-fold, (3) high-twist singles and (4) medium-twist singles
yarns. Flexural, compressive and tensile properties of the epoxy composites were compared.