Nanoporous SiC Membrane Derived from Preceramic Polymer

2007 ◽  
Vol 124-126 ◽  
pp. 1733-1736 ◽  
Author(s):  
Y. Kim ◽  
Soo Ryong Kim ◽  
B.G. Song ◽  
Vikram V. Dabhade ◽  
B.K. Sea ◽  
...  
Keyword(s):  
High Temperature ◽  
Porous Alumina ◽  
Hydrogen Permeability ◽  
Hydrothermal Condition ◽  
Ceramic Membranes ◽  
Preceramic Polymer ◽  
Nitrogen Gas ◽  
Good Thermal Stability ◽  
Preceramic Polymers ◽  
Ft Ir

Ceramic membranes having nano sized pores have great potential for gas separation at high temperature due to their good thermal stability. Moreover, nanoporous silicon carbide membrane has potential application under hydrothermal condition at high temperature. In this research, nanoporous SiC membrane has been developed on the porous alumina plate using preceramic polymers as CVD precursor at 850oC. The preceramic polymer was characterized with Si29 NMR, FT-IR, GC and TGA. The prepared SiC membrane was characterized with SEM and EDS. The hydrogen permeability and selectivity toward nitrogen gas were measured using a GC.

Hydrogen Separation Characteristics of SiC Nanoporous Membrane at High Temperature

2007 ◽  
Vol 26-28 ◽  
pp. 271-274 ◽  
Author(s):  
Y. Kim ◽  
Eun Bi Kim ◽  
Soo Ryong Kim ◽  
Moo Hyun Suh ◽  
Doo Jin Choi ◽  
...  
Keyword(s):  
High Temperature ◽  
Pore Size ◽  
Coal Gasification ◽  
Hydrogen Permeability ◽  
Hydrothermal Condition ◽  
Ceramic Membranes ◽  
Combined Cycle ◽  
Hydrogen Separation ◽  
Alumina Support ◽  
Good Thermal Stability

Ceramic membranes having less than 1nm size pores have great potential for gas separation at high temperature due to their good thermal stability. Moreover, nanoporous silicon carbide membrane has potential application under hydrothermal condition at high temperature since it is highly stable at high temperature. In this research, nanoporous SiC membrane has been developed on porous alumina support using preceramic polymer. Pore size of the SiC membrane was controlled using polystylene(PS) as the pore forming agent. The SiC membrane having controlled pore size was characterized with SEM, EDS, FT-IR, XRD and pore size measurement. The hydrogen permeability and selectivity toward nitrogen gas of the developed membrane were 0.3 x 10-6 mole/m2.s.pa and 4.1, respectively. The nanoporous hydrogen selective SiC membrane shows promising application in membrane reactor for steam reforming reacti on of natural gas, water gas shift reactions and hydrogen separation from coal gasification such as Integrated Gasification Combined Cycle (IGCC).

Preparation of SiC Nanoporous Membrane for Hydrogen Separation at High Temperature

2006 ◽  
Vol 510-511 ◽  
pp. 926-929 ◽  
Author(s):  
Y. Kim ◽  
Soo Ryong Kim ◽  
Kun Hang Cho ◽  
Seong Youl Bae ◽  
Woo Teck Kwon
Keyword(s):  
Pore Size Distribution ◽  
Pore Size ◽  
Size Distribution ◽  
Porous Alumina ◽  
Amorphous State ◽  
Hydrogen Separation ◽  
Preceramic Polymer ◽  
Preceramic Polymers ◽  
Coating Method ◽  
Ft Ir

Nanoporous SiC membrane was developed on the porous alumina plate for the hydrogen separation using preceramic polymers such as polyphenylcarbosilane. The prepared preceramic polymers were characterized with FT-IR, TGA, GPC and XRD. Nanoporous SiC membrane was derived from the preceramic polymer using a spin coating method. The SiC membrane spin coated using 20 wt.% of polyphenylcarbosilane solution in cyclohexane does not show any cracks on the surface after heat treatment at 800oC. The average thickness of the SiC membrane is about 1µm. SiC coated porous alumina possesses asymmetric pore size distribution. There are micropores that originated from porous alumina substrate, and nanopores that derived from amorphous state of SiC membranes. The pore size distribution measurement showed that the sample contains 1-3 nm sized nano pores.

Hydrogen permeability of a nickel alloy after high-temperature holding in technical helium

1990 ◽  
Vol 25 (6) ◽  
pp. 610-612
Author(s):  
Yu. I. Belyakov ◽  
Yu. I. Zvezdin ◽  
E. V. Zagainova ◽  
Yu. V. Peretyagin
Keyword(s):  
High Temperature ◽  
Nickel Alloy ◽  
Hydrogen Permeability

Effect of the Pulse Laser Radiation on the Stabilization of the ZrO2 and HFO2 High-Temperature Phases

2015 ◽  
Vol 245 ◽  
pp. 200-203 ◽  
Author(s):  
Maxim Alexandrovich Pugachevskii ◽  
Viktor Igorevich Panfilov
Keyword(s):  
High Temperature ◽  
Transmission Electron Microscopy Data ◽  
X Ray Diffraction ◽  
X Ray ◽  
Good Thermal Stability ◽  
Quantitative Content ◽  
Electron Microscopy Data ◽  
Cubic Phases ◽  
Transmission Electron ◽  
Microscopy Data

The conditions of formation of the ZrO2 and HfO2 high-temperature (tetragonal and cubic) phases in the ablated nanoparticles were investigated. X-ray diffraction and transmission electron microscopy data demonstrate that laser intensities above 109 W/m2 ensure the formation of the ZrO2 high-temperature phases, while intensities above 5·109 W/m2 do the formation of the HfO2 high-temperature phases. Quantitative content of the high-temperature phases in layers of the ablated nanoparticles increases with raising the intensity. The obtained nanoparticles exhibit good thermal stability.

Study of High Temperature Properties of AlSi10Mg Alloy Produced by Laser-Based Powder Bed Fusion

2021 ◽  
Vol 1016 ◽  
pp. 1485-1491
Author(s):  
Marialaura Tocci ◽  
Alessandra Varone ◽  
Roberto Montanari ◽  
Annalisa Pola
Keyword(s):  
High Temperature ◽  
Additive Manufacturing ◽  
Test Temperature ◽  
Vertical Direction ◽  
Material Behavior ◽  
High Temperature Strength ◽  
Powder Bed Fusion ◽  
Mechanical Spectroscopy ◽  
Powder Bed ◽  
Good Thermal Stability

Additive manufacturing of Al alloys can represent an interesting solution for high-performance components in various industrial fields, as for instance the automotive and aerospace industry. Often, for these applications, the alloys are required to withstand exposure to high temperatures. Therefore, the investigation of the evolution of material properties with increasing temperature is of utmost importance in order to assess their suitability for this kind of applications. In the present study, tensile properties at high temperature were investigated for an AlSi10Mg alloy. Samples were manufactured by laser-based powder bed fusion in horizontal and vertical direction in order to examine the influence of building direction on material behavior. The samples were tested in as-built condition and after exposure to high temperature. Tensile tests were performed up to 150 °C and the effect of holding time at the test temperature was evaluated. Furthermore, the alloy was characterized by mechanical spectroscopy in order to evaluate the behavior of dynamic modulus with temperature and, thus, to provide a comprehensive characterization of the material behavior. It was found that the peculiar microstructure of the alloy produced by additive manufacturing is responsible for good high-temperature strength of the material up to 150 °C. The material also exhibits a good thermal stability even after holding at test temperature for 10 h.

Characteristics of castables incorporating highly porous alumina aggregates fabricated by high-temperature evaporation method

2019 ◽  
Vol 45 (10) ◽  
pp. 13509-13517 ◽  
Author(s):  
Muto Daimu ◽  
Shinobu Hashimoto ◽  
Yusuke Daiko ◽  
Sawao Honda ◽  
Yuji Iwamoto
Keyword(s):  
High Temperature ◽  
Porous Alumina ◽  
Evaporation Method ◽  
Highly Porous

Annealing behaviors of structural, interfacial and optical properties of HfO2 thin films prepared by plasma assisted reactive pulsed laser deposition

2010 ◽  
Vol 25 (4) ◽  
pp. 680-686 ◽  
Author(s):  
Zhifeng Ying ◽  
Wentao Tang ◽  
Zhigao Hu ◽  
Wenwu Li ◽  
Jian Sun ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Optical Properties ◽  
High Temperature ◽  
Pulsed Laser Deposition ◽  
Pulsed Laser ◽  
Laser Deposition ◽  
High Temperature Annealing ◽  
Good Thermal Stability ◽  
Transmission Measurements ◽  
Deposited Films

The structure and properties of HfO2 films deposited by plasma assisted reactive pulsed laser deposition and annealed in N2 were studied upon thermal annealing as well as the evaluation of thermal stability by Fourier transform infrared spectroscopy, spectroscopic ellipsometry, and optical transmission measurements. The as-deposited HfO2 films appear predominantly monoclinic with an amorphous matrix which becomes crystallized after high-temperature annealing. No interfacial SiOx is observed for the as-deposited films on Si. The deposited HfO2 films exhibit good thermal stability and show excellent transparency in a wide spectral range with optical band gap energies of 5.65–5.73 eV depending on annealing temperature. An improvement in the optical properties by high-temperature annealing is also observed.

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