REFINEMENT OF REPAIR PROCEDURES OF THERMAL GENERATING SET COFFERING

2016 ◽  
Vol 6 (4) ◽  
pp. 54-58 ◽  
Author(s):  
Alexey I. KHLYSTOV ◽  
Svetlana V. SOKOLOVA ◽  
Vladimir A. SHIROKOV
Keyword(s):  
Chemical Resistance ◽  
Metallic Aluminum ◽  
Generating Set ◽  
Phosphate Bond ◽  
Heat Resistant ◽  
Dispersed Particles ◽  
Soluble Glass ◽  
Binding Substance ◽  
Fireclay Refractory ◽  
Glass Heat

Different repair procedures for coffering of thermal generating set from fireclay refractory are viewed. To improve repair technologies the authors propose formulations of soluble-glass heat resistant plactic compositions with spread effect raised from metallic aluminum in the form of fine-dispersed particles. Coffering is treated by method of liquid phosphate bond deep impregnation to enhance thermal and chemical resistance of coffering repair surface. Phosphate bonds permit to enhance density and resistance of compositions based on any binding substance.

scholarly journals UV Curable Heat Resistant Epoxy Acrylate Coatings

2010 ◽  
Vol 4 (3) ◽  
pp. 205-216
Author(s):  
Firdous Habib ◽  
◽  
Madhu Bajpai ◽  
Keyword(s):  
Heat Resistance ◽  
Chemical Resistance ◽  
Polymeric Materials ◽  
Organic Polymer ◽  
Epoxy Acrylate ◽  
Uv Curable ◽  
Heat Resistant ◽  
Acrylate Resin ◽  
Physical And Chemical ◽  
Silicone Acrylate

Polymeric materials are exposed to high temperatures that results in lowering of the film integrity. A blend of an epoxy resin with the silicone acrylate resin was developed to provide high heat resistance UV cured coatings. Earlier siliconized epoxy coatings had been developed by conventional curing. But due to environmental awareness, high productivity rate, low process costs and energy saving UV curable coatings are enjoying considerable growth. Thermally stable UV cured coatings used in the present study were developed from silicone acrylate and epoxy acrylate resin with different diluents and photoinitiator. Such coatings provide higher thermal stability (693 K) along with physical and chemical resistance. In addition, such coatings can also be obtained by using functional amino silanes. The resin developed provides a simple and practical solution to improve heat resistance along with physical and chemical resistance of the UV cured coatings. The purpose of this research paper is to develop UV curable heat resistant coatings by the combination of inorganic and organic polymer, taking epoxy acrylate as a base resin.

A New Fluoroelastomer Derived from Tetrafluoroethylene and Propylene

1977 ◽  
Vol 50 (2) ◽  
pp. 403-412 ◽  
Author(s):  
G. Kojima ◽  
H. Kojima ◽  
Y. Tabata
Keyword(s):  
Mechanical Properties ◽  
Molecular Weight ◽  
Low Temperature ◽  
Chemical Resistance ◽  
Polymer Structure ◽  
High Potential ◽  
Structure And Properties ◽  
Heat Resistant

Abstract (1) A process to produce C2F4-C3H6 copolymer of molecular weight over 150 000 was established by exploiting a new catalyst which permits low temperature polymerization. (2) A vulcanization recipe, comprised of peroxide and TAIC, was established to give the copolymer superior vulcanizate properties. (3) Polymer structure and properties were elucidated, and the high potential as a heat-resistant elastomer was shown. (4) The resultant vulcanizate has been proved to be a unique fluoroelastomer with outstanding heat and chemical resistance as well as mechanical properties which are adequate in practice.

An Investigation of the Properties of Polymer and Film Materials Based on Polyamidobenzimidazoles

2017 ◽  
Vol 44 (12) ◽  
pp. 57-62
Author(s):  
V.V. Khakhinov ◽  
O.V. Il'ina
Keyword(s):  
Comparative Study ◽  
Physicochemical Properties ◽  
Chemical Resistance ◽  
Polymeric Materials ◽  
Strength Properties ◽  
Corrosive Media ◽  
Heat Resistant ◽  
Industrial Materials

A comparative study of the thermomechanical and strength properties of polymer and film materials based on polybenzimidazoles was carried out. The investigated polymeric materials are more heat resistant, have low flammability, and possess high physicochemical properties, combined with chemical resistance in various corrosive media, by comparison with analogous industrial materials.

scholarly journals OPTIMIZATION OF MIX-DESIGN OF CHEMICALLY RESISTANT SPRAYED CONCRETE

2019 ◽  
Vol 22 ◽  
pp. 26-30
Author(s):  
Radek Hermann ◽  
Rostislav Drochytka ◽  
Jiří Kolísko ◽  
Pavel Reiterman
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Fly Ash ◽  
Chemical Resistance ◽  
Raw Materials ◽  
Waste Glass ◽  
Mix Design ◽  
Sprayed Concrete ◽  
Secondary Raw Materials ◽  
Soluble Glass

This paper addresses optimization of mix-design and granulometric curves of aggregate of chemically resistant cementitious sprayed mix. The target of the paper is to improve properties of currently developed mix-design, which has no chemical resistance, and to utilize the secondary raw materials. The mix was optimized by additions improving chemical resistance and binder substituted by secondary raw materials. The binder was substituted by finely ground waste glass and high-temperature fly ash. Filler was substituted with slag from deposit yard and waste sand with soluble glass from steel manufacture. Main observed properties for design of optimized mix were workability time, consistence and physical-mechanical properties. Optimized mix-design successfully replaced all fine parts of filler and up to 30% of binder while the physical-mechanical properties were preserved or even enhanced. Optimized mix-designs show the same consistencies and workability times.

Characteristic Geometry and Diffraction Contrast of Dispersed ThO2 Crystals

1969 ◽  
Vol 27 ◽  
pp. 168-169
Author(s):  
R. J. Horylev ◽  
L. E. Murr
Keyword(s):  
Dark Field ◽  
Particle Orientation ◽  
Contrast Effects ◽  
Strain Fields ◽  
Diffraction Contrast ◽  
Dispersed Particles ◽  
Field Electron Microscopy ◽  
Dark Field Electron ◽  
Particle Images ◽  
Diffraction Effects

Smith has shown by dark-field electron microscopy of extracted ThO2 particles from TD-nickel (2% ThO2) that they possess single crystal characteristics. It is generally assumed that these particle dispersions are incoherent. However, some diffraction effects associated with the particle images appeared to be similar to coherency strain fields. The present work will demonstrate conclusively that ThO2 dispersed particles in TD-nickel (2% ThO2) and TD-NiCr (2% ThO2, 20% Cr, Ni) are single crystals. Moreover, the diffraction contrast effects are extinction fringes. That is, these effects arise because of the particle orientation with respect to the electron beam and the extinction conditions for various operating reflections The particles are in fact incoherent.

Surface treatment with silver particles isles on Titanium cp: study of antimicrobial activity

2020 ◽  
Vol 9 (4) ◽  
pp. e27942662
Author(s):  
Patrícia Capellato ◽  
Cláudia Eliana Bruno Marino ◽  
Gilbert Silva ◽  
Lucas Victor Benjamim Vasconcelos ◽  
Rodrigo Perito Cardoso ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Surface Treatment ◽  
Titanium Surface ◽  
Silver Clusters ◽  
Silver Particles ◽  
Silver Deposition ◽  
Dispersed Particles ◽  
Significant Difference ◽  
Diffusion Assay ◽  
Antibacterial Potential

During the last decades, researchers have been growing the interest in surface treatment with an antimicrobial agent. Silver nanoparticles (AgNPs) are widely used in biomedical fields due to their potent antimicrobial activity. So, in this study was investigated silver particles (isles) coated on titanium surface for dental and orthopedic application. Silver particles coating process on titanium surface were performed via sputtering that is a plasma-assisted deposition technique with and titanium without treatment was applied as comparing standard. Plasma treatment parameters were optimized so that the result was not a thin film of Ag but dispersed particles of Ag on the Ti-cp surface. The alloy surfaces were investigated using scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). In order to investigate antibacterial potential Staphylococcus aureus and Escherichia coli have been used at Agar diffusion assay. The results were analyzed by analysis of variance (ANOVA) in order to verify significant difference antimicrobial activity between samples that have shown no difference between the surfaces studied treatments. For silver deposition scattered particles (isles) over titanium surface for a 10-minute treatment, EDS revealed by silver clusters that the particles were not properly scattered onto surface, hence, the low effectiveness in antibacterial activity.

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