Studies of Humic Substances at Different pH Values using Scanning Electron Microscopy, Scanning Tunnelling Electron Microscopy, and Electron Probe X-Ray Micro Analysis

1997 ◽  
pp. 93-99
Author(s):  
A.J. Simpson ◽  
C.L. Graham ◽  
M.H.B. Hayes ◽  
K.A. Stagg ◽  
P. Stanley
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Humic Substances ◽  
Electron Probe ◽  
X Ray ◽  
Ph Values ◽  
Scanning Tunnelling ◽  
Micro Analysis ◽  
Scanning Electron

scholarly journals The Influence of A Mo Addition on the Interfacial Morphologies and Corrosion Resistances of Novel Fe-Cr-B Alloys Immersed in Molten Aluminum

Materials ◽  
2019 ◽  
Vol 12 (2) ◽  
pp. 256 ◽  
Author(s):  
Zicheng Ling ◽  
Weiping Chen ◽  
Weiye Xu ◽  
Xianman Zhang ◽  
Tiwen Lu ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Electron Probe ◽  
Molten Aluminum ◽  
Dendritic Structure ◽  
H13 Steel ◽  
X Ray ◽  
Transmission Electron ◽  
The Matrix ◽  
Scanning Electron

The influence of a Mo addition on the interfacial morphologies and corrosion resistances of novel Fe-Cr-B alloys in molten aluminum at 750 °C was systematically investigated using scanning electron microscopy, X-ray diffractometer, electron probe microanalysis, and transmission electron microscopy. The results indicated that Mo could not only strengthen the matrix but also facilitate the formation of borides. Furthermore, the microstructures of Mo-rich M2B boride changed from a local eutectic net-like structure to a typical coarse dendritic structure and a blocky hypereutectic structure with increasing Mo addition. This was true of the blocky Mo-rich M2B boride, rod-like Cr-rich M2B boride and the corrosion products, which had a synergistic effect on retarding of the diffusion of molten aluminum. Notably, the corrosion resistance of the Fe-Cr-B-Mo alloy, with an 8.3 wt.% Mo addition, was 3.8 times higher than that of H13 steel.

scholarly journals Conduction Processes in Thick Film Resistors. Part I

1976 ◽  
Vol 3 (3) ◽  
pp. 131-140 ◽  
Author(s):  
M. P. Ansell
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Thick Film ◽  
Electron Probe ◽  
Electronic Conduction ◽  
Borosilicate Glasses ◽  
Electron Probe Micro Analysis ◽  
Metal Group ◽  
Micro Analysis ◽  
Scanning Electron

The structures of three families of thick film resistors have been investigated by scanning electron microscopy and electron probe micro-analysis. The two principal components of the resistive glazes, that is the conducting pigment and the glassy binder, have been identified in each case. The pigments were found to be simple or ternary oxides of the Pt transition metal group and Pd/PdO/Ag alloys. The glassy binders were based on lead borosilicate glasses.A model for the electronic conduction processes through the glass and pigments is proposed on the basis of the observed physical structures, the measured electrical properties of resistors and the properties of the component resistor materials.Part I of the total paper is concerned with identifying the phases in various Thick Film Resistors and part II considers the conduction processes that are appropriate.

A Scanning Electron Microscopy and Electron Probe X-Ray Microanalysis (SEM-EPMA) of Pink Teeth

1988 ◽  
Vol 33 (6) ◽  
pp. 12576J ◽  
Author(s):  
Noriaki Ikeda ◽  
Goutaro Watanabe ◽  
Akira Harada ◽  
Tsuneo Suzuki
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Electron Probe ◽  
X Ray ◽  
Pink Teeth ◽  
Scanning Electron

Estimation of Interdiffusivities of the Pseudo NiAl Binary Phase Formed in a Nickel-based Superalloy by Pack Cementation

2005 ◽  
Vol 20 (9) ◽  
pp. 2340-2347 ◽  
Author(s):  
H. Wei ◽  
X.F. Sun ◽  
Q. Zheng ◽  
H.R. Guan ◽  
Z.Q. Hu ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Electron Probe ◽  
Pack Cementation ◽  
X Ray Diffraction ◽  
X Ray ◽  
Binary Phase ◽  
Nickel Based Superalloy ◽  
Transmission Electron ◽  
Scanning Electron

The pseudo NiAl binary phase was formed in a nickel-based superalloy by pack cementation. Scanning electron microscopy, transmission electron microscopy, x-ray diffraction, electron probe microanalysis, and positron annihilation technique were used to characterize the pseudo NiAl binary phase. Based on reasonable assumptions, the chemical interdiffusivities of the pseudo NiAl binary phase were then assessed by means of the modified Wagner’s method. The results showed that the chemical interdiffusivities of the pseudo NiAl binary phase were about two orders of magnitude lower than those reported by others. The analysis indicated that the change in thermodynamic properties due to the additions of the microalloying atoms originally present in a superalloy could be responsible mainly for a decrease in chemical interdiffusivities.

scholarly journals Studi Metode Pendinginan Super Cepat untuk Pembentukan Bulk Metallic Glasses pada Paduan Cu45Zr45Al5Ag5

2019 ◽  
Vol 3 (2) ◽  
pp. 10-17
Author(s):  
Andromeda Dwi Laksono ◽  
Rifqi Aulia Tanjung
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Differential Scanning Calorimetry ◽  
Metallic Glasses ◽  
Electron Probe ◽  
Bulk Metallic Glasses ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Energy Dispersion Spectrometer ◽  
Scanning Electron

Bulk Metallic Glass (BMG) memiliki sifat mekanik, magnetik, kimia dan fisik yang berbeda dengan paduan polikristalin karena susunan internal atomnya yang tidak teratur. Sehingga, BMG memiliki kekuatan mekanik yang baik, kekerasan yang tinggi, ketahanan terhadap aus dan korosi yang tinggi, dan kehalusan permukaan yang baik. Berdasarkan sifat tersebut, BMG memiliki kelayakan yang menjanjikan di bidang industry. Dalam penelitian ini, metode pengecoran cetakan di tembaga digunakan untuk menyiapkan BMG paduan Cu45Zr45Al5Ag5. Paduan dileburkan ulang dengan pendinginan super cepat menggunakan mesin pendingin di bawah temperatur -25 oC. Dengan metode pengecoran cetakan di tembaga, sampel ukuran besar berbentuk batang dipotong dengan diameter 2 mm hingga 4 mm dan panjang 30 mm. Batang kemudian dipotong lagi menjadi spesimen berbentuk cakram. Untuk memastikan apakah sampel adalah BMG atau tidak, sampel dievaluasi dengan Scanning Electron Microscopy (SEM), Energy Dispersion Spectrometer (EDS), Differential Scanning Calorimetry (DSC), Electron Probe X-ray Micro Analyzer (EPMA), dan X -ray Difraction (XRD). Hasilnya dibahas dalam penelitian ini. Kata Kunci: Bulk Metallic Glasses, Cu45Zr45Al5Ag5, Pengecoran Cetakan di Tembaga.

scholarly journals Conduction Processes in Thick Film Resistors. Part II

1976 ◽  
Vol 3 (3) ◽  
pp. 141-151 ◽  
Author(s):  
M. P. Ansell
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Thick Film ◽  
Electron Probe ◽  
Electronic Conduction ◽  
Borosilicate Glasses ◽  
Electron Probe Micro Analysis ◽  
Metal Group ◽  
Micro Analysis ◽  
Scanning Electron

The structures of three families of thick film resistors have been investigated by scanning electron microscopy and electron probe micro-analysis. The two principal components of the resistive glazes, that is the conducting pigment and the glassy binder, have been identified in each case. The pigments were found to be simple or ternary oxides of the Pt transition metal group and Pd/PdO/Ag alloys. The glassy binders were based on lead borosilicate glasses.A model for the electronic conduction processes through the glass and pigments is proposed on the basis of the observed physical structures, the measured electrical properties of resistors and the properties of the component resistor materials.Part I of the total paper is concerned with identifying the phases in various thick film resistors and part II considers the conduction processes that are applicable.

Water damage in polyester resins

1967 ◽  
Vol 300 (1463) ◽  
pp. 415-419 ◽  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
High Pressure ◽  
Electron Probe ◽  
Polyester Resin ◽  
Water Soluble ◽  
Stress Distributions ◽  
Polyester Resins ◽  
X Ray ◽  
Scanning Electron

The nature of cracks, produced in three cured polyester resins during exposure to water has been studied by the combined techniques of optical microscopy, scanning electron microscopy and electron probe X-ray microanalysis. There are many cracks totally enclosed within the resin and it is shown that these must be attributed to pockets of high pressure produced at impurity inclusions by interaction with water : in most cases, osmotic pressure from water soluble inorganic inclusions. The distribution and orientation of cracks gives evidence of relatively complex laminar stress distributions generated by water exposure in a polyester resin plate. There can be a laterally compressive stress in the interior of a plate, with laterally tensile stress at or nearer to the surface. It is pointed out that the interactions of water with a cured polyester resin have the necessary complexity to generate such stress systems since the first effects, water uptake and hydrolysis, causing swelling, also enhance molecular mobility and can promote further double-bond polymerization, accompanied by shrinkage.

scholarly journals Synthesis and solubility of brompyromorphite Pb5(PO4)3Br

Mineralogia ◽  
2012 ◽  
Vol 43 (1-2) ◽  
pp. 129-135 ◽  
Author(s):  
Urszula Janicka ◽  
Tomasz Bajda ◽  
Maciej Manecki
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Solubility Product ◽  
X Ray Diffraction ◽  
Ph Measurements ◽  
X Ray ◽  
Ph Values ◽  
Free Energy Of Formation ◽  
Scanning Electron ◽  
Energy Of Formation

AbstractThe bromide analogue of pyromorphite Pb5(PO4)3Br was synthesized and characterized by X-ray diffraction, infrared spectroscopy and scanning electron microscopy. The solubility of the brompyromorphite was measured at 25°C and pH values of 2.0, 2.6 and 3.2. For the 3 pH measurements, the average solubility product, log KSP, for the reaction Pb5(PO4)3Br ⇔ 5Pb2+ + 3PO- 3- + Br- at 25ºC is -77.38 ± 0.70. The free energy of formation, ΔG°f,298, calculated from this measured solubility product is -3724.7 ± 4.3 kJ mol−1. These results confirm that brompyromorphite is more soluble than pyromorphite.

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