Oxidation Resistance and Insulation of AlPO4/Al2O3 Coating on Tungsten Substrate at High Temperature

2017 ◽  
Vol 1142 ◽  
pp. 168-172
Author(s):  
Ai Ling Fan ◽  
Ying Kun Xue ◽  
Wei Tian Li
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
High Temperature ◽  
Composite Coating ◽  
Oxidation Resistance ◽  
Electronic Device ◽  
Sol Gel ◽  
Gel Method ◽  
Scanning Electron ◽  
Tungsten Substrate

To improve the oxidation resistance and insulation of tungsten electronic device at high temperature, an AlPO4/Al2O3 composite coating was synthesized on the tungsten substrate by sol-gel method. The morphology of coating was investigated by scanning electron microscopy (SEM). Compared to the blank specimens, the coated ones exhibit excellent oxidation resistance and insulation at about 1100, which can be attributed to the compact coating without porosity and crack. Up to 1200, the effects of coating became dramatically poor. The electron conductivity mechanism was discussed.

Biomorphic TiO2 Ceramics Prepared from Cotton Stalk

2012 ◽  
Vol 602-604 ◽  
pp. 526-529
Author(s):  
Qing Wang ◽  
Lin Zhang ◽  
Ya Hui Zhang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Phase Composition ◽  
High Temperature ◽  
Sol Gel ◽  
Cotton Stalk ◽  
X Ray Diffraction ◽  
X Ray ◽  
Carbon Template ◽  
Scanning Electron

Biomorphic TiO2 was prepared by high temperature pyrolysis and a modified sol-gel route. The morphology and microstructure of TiO2 samples were characterized by scanning electron microscopy. The phase composition of the resulting sample was analyzed by X-ray diffraction. The results suggest that the biomorphic TiO2 mainly consists of rutile TiO2, and replicates the shape and part microstructure of the carbon template.

scholarly journals Nanocomposites Produced by Growth of Hydroxyapatite onto Silica Particles Prepared by the Sol-Gel Method

1996 ◽  
Vol 5 (1) ◽  
pp. 096369359600500 ◽  
Author(s):  
R. Rodríguez ◽  
J. Coreño ◽  
J.A. Arenas ◽  
V.M. Castaño
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Sol Gel ◽  
Silica Particles ◽  
X Ray Diffraction ◽  
Gel Method ◽  
X Ray ◽  
Sol Gel Method ◽  
Silica Sols ◽  
Scanning Electron

The growth of hydroxyapatite, a calcium phosphate, on silica particles prepared by the sol-gel method is reported. The size of the silica sols was controlled by changing the pH of water before the mixing with the alcoxide. Particle size profiles of sols were obtained by using dynamical light scattering. The characterisation of the composites, of nanometer sizes, was performed by employing X-ray diffraction, scanning electron microscopy and Raman spectroscopy.

Characteristic of Nanoporous SiO2 Thin Film Prepared by Sol-Gel Method with Catalyst HF

2005 ◽  
Vol 475-479 ◽  
pp. 1733-1736 ◽  
Author(s):  
Z.W. He ◽  
Xing Qin Liu ◽  
D.Y. Xu ◽  
Qiang Su ◽  
D.F. Guo ◽  
...  
Keyword(s):  
Thin Film ◽  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Dielectric Constant ◽  
Sol Gel ◽  
Gel Method ◽  
Sol Gel Method ◽  
Sio2 Thin Film ◽  
Reaction In Solution ◽  
Scanning Electron

The characteristic of nanoporous SiO2 thin film prepared by sol-gel method with catalyst HF was studied by scanning electron microscopy, Fourier transform infrared, HP analyzer series and ellipsometry. Results showed the incorporation of HF effectively adjusted the pore size and distribution, and lowered the leakage current density and dielectric constant. This might be related to the weak acidity of HF, which properly controlled the velocity of chemical reaction in solution, and to the introduction of strong Si-F bonds, which had the lower electronegative and the larger volume.

Synthesis and Characterization of Al2O3-SiC Nano Composite by Sol-Gel Method and the Effect of TiO2 on Sintering

2011 ◽  
Vol 13 ◽  
pp. 7-19 ◽  
Author(s):  
Hamid Reza Rezaie ◽  
Raheleh Mohammad-Rahimi ◽  
Ali Nemati ◽  
M. Samadani
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Sol Gel ◽  
Nitrogen Atmosphere ◽  
Nano Particles ◽  
Matrix Composites ◽  
Gel Method ◽  
Sol Gel Method ◽  
Nano Powder ◽  
Scanning Electron

In the present article, α-Al2O3 nano powder was synthesized by a simple aqueous sol–gel method by using AlCl3 as precursor. It was shown that the gel calcined at 1000°C, 1100 °C and 1200 °C resulted in the formation of a crystalline α-Al2O3 nano powder. In continue TEOS and saccharose was used to prepare SiO2 xerogels containing carbon nano particles. The conversion of the gel to β-SiC nano powders was accomplished by carbothermal reduction at 1500°C for 1 h in argon atmosphere. In second pace alumina matrix composites with nano particles of 5 vol% SiC were prepared with the addition of TiO2 as sintering aid and densified by pressureless sintering method at 1600°C and 1630°C for 2 h in nitrogen atmosphere. Green pellets were obtained by uniaxial pressing of 137 MPa. Maximum density (97.3%) was achieved at 1630°C. Vickers hardness was 16.5 GPa after sintering at 1630°C. Scanning electron microscopy revealed that the SiC particles were well distributed throughout the composite matrix. The precursors and the resultant powders were characterized by X-ray diffraction (XRD), thermal analysis (STA) and scanning electron microscopy (SEM).

Fabrication of Bioactive Glass with Titanium Ion Doping via Various Reactive Environments

2019 ◽  
Vol 801 ◽  
pp. 21-26
Author(s):  
Wei Fang ◽  
Bo Rui Huang ◽  
Tzu Hao Liu ◽  
Jhih An Chen ◽  
Ching Fen Chang ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Chemical Composition ◽  
Bioactive Glass ◽  
Sol Gel ◽  
Energy Dispersive ◽  
Gel Method ◽  
X Ray ◽  
Ion Doping ◽  
Scanning Electron

Bioactive glass has high biocompatibility and bioactivity. With specific ion adding, it can show different advantages. Titanium ion can improve the mechanic strength, antibacterial ability of bioactive glass, and stability. In this study, bioactive glass with titanium ion doping by the sol-gel method via various reactive environments was fabricated successfully. The morphology was observed by scanning electron microscopy (SEM). The chemical composition was measured by energy dispersive X-ray spectrometer (EDS). By soaking in SBF, the bioactivity of samples had also been analyzed. The formula of bioglass has been optimized to make the better bioactivity.

scholarly journals Structural and optical properties of SnO2–Al2O3 nanocomposite synthesized via sol-gel route

2015 ◽  
Vol 33 (4) ◽  
pp. 714-718 ◽  
Author(s):  
Neeraj K. Mishra ◽  
Chaitnaya Kumar ◽  
Amit Kumar ◽  
Manish Kumar ◽  
Pratibha Chaudhary ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Optical Properties ◽  
Sol Gel ◽  
Physical Interaction ◽  
X Ray Diffraction ◽  
Structural And Optical Properties ◽  
X Ray ◽  
Sensing Applications ◽  
Scanning Electron

AbstractA nanocomposite of 0.5SnO2–0.5Al2O3 has been synthesized using a sol-gel route. Structural and optical properties of the nanocomposite have been discussed in detail. Powder X-ray diffraction and scanning electron microscopy with energy-dispersive X-ray diffraction spectroscopy confirm the phase purity and the particle size of the 0.5SnO2–0.5Al2O3 nanocomposite (13 to 15 nm). The scanning electron microscopy also confirms the porosity in the sample, useful in sensing applications. The FT-IR analysis confirms the presence of physical interaction between SnO2 and Al2O3 due to the slight shifting and broadening of characteristic bands. The UV-Vis analysis confirms the semiconducting nature because of direct transition of electrons into the 0.5SnO2–0.5Al2O3 nanocomposites.

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