Study on the Properties of Al-Al2O3 Composite Using Synthesized Alumina from Sol Gel Technique

2012 ◽  
Vol 59 (2) ◽  
Author(s):  
Hasmaliza Mohamad ◽  
Hanisah Abdul Rani
Keyword(s):  
Metal Matrix ◽  
Sintering Temperature ◽  
Sol Gel ◽  
Comparison Study ◽  
Commercial Alumina ◽  
Al2o3 Composite ◽  
Alumina Particles ◽  
Gel Technique ◽  
Ideal Method ◽  
The Ideal

Alumina reinforced aluminum is one of metal matrix composite (MMC) systems that can maintain its properties although at high temperature. Among various processes to produce MMC, powder metallurgy is the best method because of its efficiency dispersion of fine alumina particles. In this study, alumina powders were synthesized through sol gel method which is known as one of the ideal method to produce good properties of powders. The performances of synthesized alumina powders were then observed through the fabrication of composite. The percentage of alumina (0wt%, 10wt%, 20wt% and 30wt %) and sintering temperature (500°C and 550°C) were varied in order to observed their effects on the produced composite. Result shows that by increasing the percentage of alumina and sintering temperature, mechanical properties were increased where 30wt% alumina and 550°C sintering temperature give the optimum results. Comparison study by using 30wt% alumina and 550°C sintering temperature on the composite using synthesize and commercial alumina shows similar/comparable properties of composite.

Synthesis of Titania coated Alumina Particles by a Hybrid Sol-gel Method

2002 ◽  
Vol 740 ◽  
Author(s):  
A.D. Schmidt ◽  
S.B. Majumder ◽  
P.S. Dobal ◽  
R.S. Katiyar ◽  
D.C. Agrawal
Keyword(s):  
Anatase Phase ◽  
Sol Gel ◽  
Rutile Phase ◽  
Microscopy Imaging ◽  
Nano Crystalline ◽  
Heat Treated ◽  
Alumina Particles ◽  
Gel Technique ◽  
Titania Coatings ◽  
Titania Coating

ABSTRACTModifying their surface with a coating of another ceramic material can dramatically alter the properties of ceramic particles. In the present work we have demonstrated that the Al2O3 particles can be successfully coated by TiO2 using a novel sol-gel technique. The nature of these coatings was predicted on the basis of scanning electron microscopy imaging in conjunction with the micro-Raman scattering measurements. The surface morphology of these particles shows that either individual or group of sub-micron alumina particles are coated with the nano-crystalline titania particles. The thickness of the titania coating could be varied by changing the precursor sol concentration. Amorphous titania was converted to anatase phase at 400°C and upon further heating it started transforming to rutile phase, and both these phases coexisted in the coated particles that were heat treated up to 800°C. The mechanical strength of the titania coating was measured qualitatively by ultrasonicating the coated powders for longer duration to observe that titania coatings are strongly adhered with the alumina particles.

scholarly journals Impact of alumina particles on the morphology and mechanics of hybrid wood plastic composite materials

2019 ◽  
Vol 51 (1) ◽  
pp. 115-124 ◽  
Author(s):  
Srdjan Perisic ◽  
Marija Vuksanovic ◽  
Milos Petrovic ◽  
Andjela Radisavljevic ◽  
Aleksandar Grujic ◽  
...  
Keyword(s):  
Hybrid Composite ◽  
Moisture Absorption ◽  
Sol Gel ◽  
X Ray Diffraction ◽  
Pressing Method ◽  
X Ray ◽  
Plastic Composite ◽  
Alumina Particles ◽  
Gel Technique ◽  
The Impact

Hybrid composite panels of Wood-Plastic Composites (WPC) consisting of wood and poly (methyl methacrylate) (PMMA) were reinforced with alumina particles and made by ?hot pressing? method. Alumina-based particles were made by sol-gel technique. The particles were characterized by the X-ray diffraction (XRD). The resulting alumina particles were modified with (3mercaptopropyl) trimethoxysilane (MPTMS), in order to obtain better mechanical properties of the composite relative to the composite with unmodified alumina particles. The aim of this work was to study the influence of composite structure and the moisture absorption on bending and the impact properties of the hybrid composite. The bending and impact tests revealed that modulus of elasticity and absorbed energy of deformation increased with modification of alumina and slightly decrease after moisture absorption.

scholarly journals Characteristics of unsupported alumina membrane prepared using sol-gel technique

2017 ◽  
Vol 18 (2) ◽  
Author(s):  
M.R. Othman, ◽  
A.L. Ahmad ◽  
H. Mukhtar
Keyword(s):  
Pore Size Distribution ◽  
Pore Size ◽  
Sintering Temperature ◽  
Sol Gel ◽  
Alumina Membrane ◽  
Porous Support ◽  
Porosity Level ◽  
Gel Layer ◽  
Gel Technique ◽  
Coating Time

A laboratory scale alumina membrane was prepared using sol-gel technique. Results from the experiment demonstrate that the addition of PVA is important for viscosity adjustment to determine the appropriate coating time if the membrane is required for coating on the porous support. The effects of varying PVA content  and sintering temperature on the characteristics of the sintered membrane are discussed. In this work, a 2 volume % of PVA solution containing 4g of PVA in lOOml of water was discovered to be adequate to achieve appropriate porosity level and avoid cracks in the gel layer. It was also discovered that the sol viscosity essentially increased as the PVA addition was increased. On the contrary, the coating time decreased as PVA content in the sol was increased. Generally, the pore size of the membrane increased with the increase in PVA addition. The density of the membrane increased with increase in sintering temperature. The porosity level however, decreased as the temperature was increased. The pore size became greater and pore size distribution wider at higher sintering temperatures.

Porous Pellets of Tungsten Nano Powder: Investigation of Surface Porosity of Machined Surfaces

2018 ◽  
Vol 24 (8) ◽  
pp. 5527-5531
Author(s):  
K Shwetha ◽  
V Deepa ◽  
S. Prasanna Kumar ◽  
K. Santhosh Kumar ◽  
Meduri Ravi
Keyword(s):  
Sintering Temperature ◽  
Tungsten Powder ◽  
Sol Gel ◽  
Powder Particle Size ◽  
Surface Porosity ◽  
Porous Tungsten ◽  
Nano Powder ◽  
Dispenser Cathodes ◽  
Gel Technique ◽  
Tungsten Powders

The pressed dispenser cathodes are showing problem in machining due to their less strength because of low sintering temperature. In this paper, the synthesis of Nano tungsten powders and the fabrication of machinable porous Nano tungsten matrices were discussed. The Nano tungsten powders were synthesized by two different routes. One is by using Ammonium Meta Tungstate in sol gel technique and other is dissolving micron sized tungsten particles in Hydrogen Peroxide (H2O2). Using these synthesized Nano powders, the pellets were fabricated and the results were compared with the pellet made of commercially available tungsten powder (particle size 0.6–1 μ). The pressed porous tungsten buttons are sintered at high temperature and machining is carried out after copper infiltration. In this paper, surface morphology, hardness and machinability of porous tungsten Nano pellets were discussed.

Evolution of Phase Structure and Micro-Morphologies of the La0.7M0.3MnO3 (M=Ca, Sr) Sintered at Different Temperature

2015 ◽  
Vol 1095 ◽  
pp. 402-406
Author(s):  
Shao Qun Jiang ◽  
Gang Wang ◽  
Zong Shu Li ◽  
Ze Hua Wang ◽  
Ze Hua Zhou ◽  
...  
Keyword(s):  
Phase Structure ◽  
Sintering Temperature ◽  
Perovskite Phase ◽  
Sol Gel ◽  
Obvious Effect ◽  
Single Perovskite Phase ◽  
Solid State Sintering ◽  
Gel Technique ◽  
Cubic Structure ◽  
Sintering Method

The La0.7M0.3MnO3 (M=Ca, Sr) were synthesized by combining sol-gel technique and solid state sintering method. The evolutions of phase structure and micro-morphologies of the La0.7M0.3MnO3 with final sintering temperature (950-1250°C) were investigated. The results show that the La0.7Ca0.3MnO3 compounds exhibit single perovskite phase with cubic structure and the La0.7Sr0.3MnO3 compounds exhibit single perovskite phase with rhombohedra structure. The final sintering temperature has no obvious effect on the phase structure of La0.7Ca0.3MnO3. However, the density and grain size of La0.7M0.3MnO3 (M=Ca, Sr) increase with the increase of the final sintering temperature. Moreover, the micro-morphologies of La0.7Ca0.3MnO3 are more sensitive to final sintering temperature compared with that of La0.7Sr0.3MnO3. When sintering temperature is no less than 1150°C, the La0.7Ca0.3MnO3 has hardly any pore. After sintering at no less than 1250°C, the La0.7Sr0.3MnO3 becomes dense.

scholarly journals Influence of Sintering Temperature on Low-field Spin-polarized Tunneling Magnetoresistance of La0.7Ca0.3MnO3

2008 ◽  
Vol 18 (1) ◽  
pp. 48-57 ◽  
Author(s):  
Pham Thanh Phong ◽  
Do Hung Manh ◽  
Le Van Hong ◽  
Nguyen Xuan Phuc ◽  
Nguyen Van Khiem ◽  
...  
Keyword(s):  
Transition Temperature ◽  
Sintering Temperature ◽  
Strong Dependence ◽  
Sol Gel ◽  
Temperature Drop ◽  
Conduction Electrons ◽  
Low Field ◽  
Spin Polarized ◽  
Polarized Transport ◽  
Gel Technique

In this study we report the effect of sintering temperature on the low field magnetoresistance (LFMR) of La0.7Ca0.3MnO3 manganite synthesized through sol-gel technique. The La0.7Ca0.3MnO3 has been sintered at 600°C, 700°C, 800°C, 900°C and 1200°C. The crystallite as well as particle size also show strong dependence on the sintering temperature. While the ferromagnetic – paramagnetic (FM-PM) transition temperature remains almost constant, the metal – insulation transition temperature drop gradual and the low field magnetoresistance (LFMR) increase with a decrease in grain size. We have analyzed our data based on the spin – polarized transport of conduction electrons at the grain boundaries.

Effect of Sintering Temperature on Structure and Electric Properties of (Ba0.96Ca0.04)(Zr0.05Ti0.95)O3 Ceramics

2015 ◽  
Vol 655 ◽  
pp. 141-146
Author(s):  
Xin Guan ◽  
Xiang Yun Deng ◽  
Jian Hao ◽  
Guang Hao Sun ◽  
Chuang Jun Huang
Keyword(s):  
Dielectric Constant ◽  
Sintering Temperature ◽  
Ferroelectric Properties ◽  
Sol Gel ◽  
Calcium Titanate ◽  
Ferroelectric Ceramics ◽  
X Ray Diffraction ◽  
Pure Perovskite Structure ◽  
Maximum Dielectric Constant ◽  
Gel Technique

Barium calcium titanate (Ba0.96Ca0.04)(Zr0.05Ti0.95)O3 ferroelectric ceramics were prepared by sol–gel technique. The ceramics were sintering at 1290°C-1370°C. X-ray diffraction was employed to investigate the microstructure, and the surface topography was investigated by SEM graphs. The dielectric constant vs temperature was measured by Temperature dielectric spectrometer, and TF Analyzer 2000 measured the ferroelectric properties. It can be found that all the ceramics show pure perovskite structure suggesting that solid solution were formed. SEM showed that the samples uniform in grain size at 1330 °C. Our study revealed that when the sintering temperature is 1330 °C the maximum dielectric constant was 29,600, the maximum piezoelectric coefficient d33 could reach 399pm/V and the remanent polarization (Pr) was 8.3 μc/cm2, respectively.

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