Fabrications and evaluations of hydrogen permeation on Al2O3/CeO2/graphene (ACG) composites membrane by Hot Press Sintering (HPS)

2013 ◽  
Vol 38 (18) ◽  
pp. 7654-7658 ◽  
Author(s):  
Na-Ri Lee ◽  
Soo-Sun Lee ◽  
Kyoeng-Il Kim ◽  
Whan-Gi Kim ◽  
Hyunchul Ju ◽  
...  
Keyword(s):  
Hydrogen Permeation ◽  
Hot Press ◽  
Hot Press Sintering

Preparation and Hydrogen Permeation on Al2O3-CuO-ZnO (ACZ)/Co Membrane by Hot Press Sintering (HPS)

2011 ◽  
Vol 695 ◽  
pp. 251-254 ◽  
Author(s):  
Saet Byol Rim ◽  
Kyeong Il Kim ◽  
Tae Whan Hong ◽  
Mie Won Jung
Keyword(s):  
Room Temperature ◽  
Hydrogen Permeation ◽  
Sol Gel ◽  
Hydrogen Permeability ◽  
Permeation Rate ◽  
Nitrate Hexahydrate ◽  
Distilled Water ◽  
Hot Press ◽  
Sol Gel Process ◽  
Hot Press Sintering

The Al2O3-CuO-ZnO (ACZ) was synthesized from sol-gel process with aluminum isopropoxide, copper (II) nitrate hemi pentahydrate, Zn (II) nitrate hexahydrate and primary distilled water. The ACZ synthesized powders were analyzed by TG/DTA, XRD, BET and FE-SEM. The ACZ-Co composites membrane was prepared by hot press sintering (HPS). Hydrogen permeability was characterized by Sievert's type hydrogen permeation membrane equipment. The hydrogen permeation rate was measured 0.0496 mol m-2 s-1 at room temperature under 2 bar of H2 atmosphere.

Evaluations of Hydrogen Permeation on TiN-20wt.%Co Membrane by Hot Press Sintering

2010 ◽  
Vol 297-301 ◽  
pp. 549-554
Author(s):  
Kyeong Il Kim ◽  
Sang Hern Kim ◽  
Whan Gi Kim ◽  
Soon Chul Ur ◽  
Tae Whan Hong
Keyword(s):  
Hydrogen Permeation ◽  
Operating Temperature ◽  
Hydrogen Permeability ◽  
Hydrogen Separation ◽  
Hot Press ◽  
New Materials ◽  
Practical Applications ◽  
Metal Ceramic ◽  
Polymer Metal ◽  
Hot Press Sintering

Nowadays, the most promising methods for high purity hydrogen production are membranes separation such as polymer, metal, ceramic and composites. It is well known that Pd and Pd-alloys membranes have excellent properties for hydrogen separation. However, it has hydrogen embrittlement and high cost for practical applications. Therefore, most scientists have studied new materials instead of Pd and Pd-alloys. On the other hand, TiN powders are great in resistance to acids and chemically stable under high operating temperature. In order to get specimens for hydrogen permeation, the TiN powders synthesized were consolidated together with pure Co powders by hot press sintering. During the consolidation of powders at HPS, heating rate was 10K/min and the pressure was 10MPa. It was characterized by XRD, SEM, and BET. Also, we estimated the hydrogen permeability by Sievert's type hydrogen permeation membrane equipment.

Hydrogen Permeability of NiO-Doped Alumina with Nickel Composites Membrane

2012 ◽  
Vol 724 ◽  
pp. 213-216 ◽  
Author(s):  
Bo Young Shon ◽  
Mie Won Jung
Keyword(s):  
Hydrogen Permeation ◽  
Thermal Evolution ◽  
Sol Gel ◽  
Hydrogen Permeability ◽  
Organic Additive ◽  
Hot Press ◽  
Sol Gel Process ◽  
Increase Surface Area ◽  
Nickel Composites ◽  
Hot Press Sintering

NiO-doped Al2O3was synthesized with 20 wt% of nickel nitrate using the sol-gel process. P123 as an organic additive added to increase surface area of powder. The phase transformation, thermal evolution and surface morphology of the powder were characterized by XRD, TG-DTA and FE-SEM. The 20 wt% NiO-doped Al2O3/10 wt% Ni composite membrane was prepared by hot press sintering (HPS) following with a mechanical alloying process. Hydrogen permeation flux for 20 wt% NiO-doped Al2O3/10 wt% Ni membrane was obtained as 0.1 mol/m2s at 673K.

Fabrication and Characterization of CeO2-NiO/SiC Membranes for Hydrogen Permeation

2014 ◽  
Vol 353 ◽  
pp. 143-147 ◽  
Author(s):  
Ji Hye Park ◽  
Mie Won Jung
Keyword(s):  
Mixed Oxides ◽  
Hydrogen Permeation ◽  
Sol Gel ◽  
Hot Press ◽  
Reaction Enthalpy ◽  
Sol Gel Process ◽  
Fabrication And Characterization ◽  
Hot Press Sintering ◽  
Permeation Test

In order to enhance the hydrogen permeation, Silicon carbide (SiC) was prepared with CeO2-NiO mixed oxides via sol-gel process and the SiC membranes with various contents of χ wt% mixed oxides (χ = 20, 40, 60 and 80) were fabricated by hot-press sintering (HPS) at 1173 K under vacuum condition. The effect of the CeO2-NiO mixed oxides was studied in terms of properties on hydrogen permeation. All the membranes were characterized by XRD, FE-SEM and BET instrument. The hydrogen permeation test was carried out at various temperatures under 0.1 MPa. Hydrogen permeation flux of the 80 wt% CeO2-NiO/SiC membrane, which has the highest value, was obtained at 2.92×10-6mol/m2sPa, 323 K. The reaction enthalpy (ΔH°) was calculated as - 4.95 J/mol by Arrhenius’s plot.

scholarly journals Remarkable plasma-resistance performance by nanocrystalline Y2O3·MgO composite ceramics for semiconductor industry applications

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Hyeon-Myeong Oh ◽  
Young-Jo Park ◽  
Ha-Neul Kim ◽  
Kundan Kumar ◽  
Jae-Woong Ko ◽  
...  
Keyword(s):  
Plasma Etching ◽  
Semiconductor Industry ◽  
High Plasma ◽  
Hot Press ◽  
Composite Ceramics ◽  
Plasma Resistance ◽  
Industry Applications ◽  
Hot Press Sintering ◽  
Resistance Performance ◽  
First Time

AbstractMotivated by recent finding of crystallographic-orientation-dependent etching behavior of sintered ceramics, the plasma resistance of nanocrystalline Y2O3-MgO composite ceramics (YM) was evaluated for the first time. We report a remarkably high plasma etching resistance of nanostructure YM surpassing the plasma resistance of commercially used transparent Y2O3 and MgAl2O4 ceramics. The pore-free YM ceramic with grain sizes of several hundred nm was fabricated by hot press sintering, enabling theoretical maximum densification at low temperature. The insoluble two components effectively suppressed the grain growth by mutual pinning. The engineering implication of the developed YM nanocomposite imparts enhanced mechanical reliability, better cost effectiveness with excellent plasma resistance property over their counterparts in plasma using semiconductor applications.

scholarly journals Effect of Sintering Temperature on Microstructure and Mechanical Properties of Hot-Pressed Fe/FeAl2O4 Composite

Crystals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 422
Author(s):  
Kuai Zhang ◽  
Yungang Li ◽  
Hongyan Yan ◽  
Chuang Wang ◽  
Hui Li ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Bending Strength ◽  
Sintering Temperature ◽  
Raw Materials ◽  
Hot Press ◽  
Microstructure And Mechanical Properties ◽  
Powder Particles ◽  
Hot Press Sintering ◽  
Sintering Method

An Fe/FeAl2O4 composite was prepared with Fe-Fe2O3-Al2O3 powder by a hot press sintering method. The mass ratio was 6:1:2, sintering pressure was 30 MPa, and holding time was 120 min. The raw materials for the powder particles were respectively 1 µm (Fe), 0.5 µm (Fe2O3), and 1 µm (Al2O3) in diameter. The effect of sintering temperature on the microstructure and mechanical properties of Fe/FeAl2O4 composite was studied. The results showed that Fe/FeAl2O4 composite was formed by in situ reaction at 1300 °C–1500 °C. With the increased sintering temperature, the microstructure and mechanical properties of the Fe/FeAl2O4 composite showed a change law that initially became better and then became worse. The best microstructure and optimal mechanical properties were obtained at 1400 °C. At this temperature, the grain size of Fe and FeAl2O4 phases in Fe/FeAl2O4 composite was uniform, the relative density was 96.7%, and the Vickers hardness and bending strength were 1.88 GPa and 280.0 MPa, respectively. The wettability between Fe and FeAl2O4 was enhanced with increased sintering temperature. And then the densification process was accelerated. Finally, the microstructure and mechanical properties of the Fe/FeAl2O4 composite were improved.

Mechanical and Microwave Dielectric Properties of Csf/Si3N4 Composites

2007 ◽  
Vol 546-549 ◽  
pp. 1661-1664
Author(s):  
Xiao Yan Wang ◽  
Fa Luo ◽  
Dong Mei Zhu ◽  
Wan Cheng Zhou ◽  
Hong Huan Wu
Keyword(s):  
Carbon Fibers ◽  
Microwave Dielectric Properties ◽  
Xrd Analysis ◽  
Network Analyzer ◽  
Hot Press ◽  
Frequency Range ◽  
The Real ◽  
Microwave Dielectric ◽  
Hot Press Sintering ◽  
Sintering Method

Csf/Si3N4 composites were prepared by hot-press sintering method using α-Si3N4 power, short chopping carbon-fiber and sintering additives. XRD analysis showed that the α-Si3N4 was almost completely transferred into β-Si3N4. The SEM micrographs of fractured surfaces showed that special network developed by rod-like β- Si3N4 grains. The flexure strength of 590±10MPa, and fracture toughness of 7.94±0.1MPa·m1/2 were achieved for the samples incorporated with 0.5wt% the carbon fibers .The microwave dielectric property of Csf/Si3N4 composites was measured at a frequency range of 8.2~18GHz by E8362B PNA series network analyzer. The real part (ε ′ ) of the permittivity of the Csf/Si3N4 composites increases from 10 to 58 with the rise of the content of carbon fibers in the composites, as well as the imaginary part increases from 0.03 to 98 at frequency of 9.375GHz. A strong frequency dependence of the real part was observed both in X and Ku bands.

Effects of MgO and Y2O3 on the Microstructure and Mechanical Properties of Al2O3 Ceramics

2013 ◽  
Vol 589-590 ◽  
pp. 572-577 ◽  
Author(s):  
Hua He Liu ◽  
Han Lian Liu ◽  
Chuan Zhen Huang ◽  
Bin Zou ◽  
Ya Cong Chai
Keyword(s):  
Mechanical Properties ◽  
Sintering Temperature ◽  
Hot Press ◽  
Composite Ceramics ◽  
Microstructure And Mechanical Properties ◽  
Suitable Amount ◽  
Hot Press Sintering ◽  
Grains Refinement ◽  
Better Than

Al2O3-MgO, Al2O3-Y2O3 and Al2O3-MgO-Y2O3 composite ceramics were fabricated respectively by hot-press sintering technique. With the analysis of the mechanical properties and microstructure, it was found that single additive MgO could be more favorable to the grains’ refinement and densification than Y2O3; the composite additive including both MgO and Y2O3 was better than single additive MgO or Y2O3, because their interactions could improve the mechanical properties of the Al2O3 ceramics; The sintering temperature could be reduced by adding the suitable amount of composite additives.

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