scholarly journals Polyfunctional Anion Exchangers on the Basis of Allyl Compounds, Glyсydilic Ethers of Dioxybenzenes and Some Di- and Polyamines

2016 ◽  
Vol 3 (1) ◽  
pp. 37
Author(s):  
E.E. Ergozhin ◽  
A.K. Chalov ◽  
B.A. Mukhitdinova ◽  
R.A. Iskakova
Keyword(s):  
Composite Materials ◽  
Scientific Basis ◽  
Metal Particles ◽  
Process Performance ◽  
Anion Exchangers ◽  
Disperse Particles ◽  
Finely Disperse ◽  
Mineral Adsorbents ◽  
Allyl Compounds ◽  
Process Mode

Scientific basis for preparation of new carbon-mineral adsorbents, supports, highly selective catalysts, and composite materials synthesized by a carbide cycle mechanism on the finely disperse particles of the iron subgroup metals, their alloys with some other metals is discussed. It was found that the carbide cycle mechanism involves the chemical and physical steps. The regularities of the process performance on the both stages are considered. Graphite filaments may be formed of graphite layers with either coaxial-cylindrical, coaxial-conic or stack orientations in the filament body. A number of primary and secondary properties of the graphite aggregates is being discussed. We have developed the methods for control the synthesis of carbon-mineral materials of the specified properties by varying the parameters of the metal particles, the nature of hydrocarbon decomposition, and the process mode.

Study on Composite Materials Used in the Tennis Racket

2014 ◽  
Vol 540 ◽  
pp. 52-55
Author(s):  
Tie Huan Sun
Keyword(s):  
Composite Material ◽  
Composite Materials ◽  
Production Process ◽  
Process Analysis ◽  
Tennis Player ◽  
Process Performance ◽  
Tennis Racket ◽  
Good Pair ◽  
Materials Used ◽  
Important Position

In many sports, tennis occupies an important position. For a tennis player, it is an important factor in a good pair of tennis to win the game. The composite materials in the production process in tennis racket are studies in this paper. Analyzed and demonstrated several ways from its function and structure, process performance, process and process analysis. Finally, the production process of the racket will be detailed study, and then a conclusion will be get that is composite material has important practical value in the production of a tennis racket.

scholarly journals Weakly Hydrated Anion Exchangers Doped with Cu2O and Cu0 Particles—Thermogravimetric Studies

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 925
Author(s):  
Elżbieta Kociołek-Balawejder ◽  
Ewa Stanisławska ◽  
Igor Mucha
Keyword(s):  
Thermal Analysis ◽  
Composite Materials ◽  
Oxidation State ◽  
Copper Atom ◽  
Metallic Copper ◽  
Copper Deposit ◽  
Water Repellent ◽  
Anion Exchangers ◽  
Inorganic Composition ◽  
Hygroscopic Water

Hybrid ion exchangers (HIXs) containing fine Cu2O and Cu0 particles were subjected to thermal analysis in order to determine their hygroscopic water content (with regard to their anomalously low porosity) and to determine the effect of the oxidation state of the copper atom in the deposit on the thermal properties of composite materials. Commercially available anion exchangers, Amberlite IRA 900Cl (macroreticular, M) and Amberlite IRA 402OH (gel-like, G), were used as supporting materials. M/Cu2O, G/Cu2O, M/Cu and G/Cu, containing 4.3–8.4 wt% Cu, were subjected to thermal analysis under respectively air and N2. TG/DTG curves revealed that dry M/Cu and G/Cu contained as little as 7.2% and 4.3% hygroscopic water, while M/Cu2O and G/Cu2O contained respectively 10.6% and 9.4% (Cu0 was a stronger water repellent than Cu2O). The oxidation state of the copper atom in the deposit was found to affect the amount of the forming char, and also Cu0 was found to contribute to the formation of more char than in the pyrolysis of the pure resin (the anion exchanger with no copper deposit). Under air the two kinds of particles transformed into CuO, while under N2 metallic copper and char (from the resin phase) made up the solid residue. This means that in the pyrolysis of the HIXs the inorganic phase participated in char formation and it also transformed itself (undergoing reduction when possible). The above findings provide a basis for in-depth research aimed at the innovative use of copper-containing HIXs and at obtaining usable composite materials with a designed (organic-inorganic) composition.

Metal-Filled Resin Composites

1973 ◽  
Vol 52 (3) ◽  
pp. 522-532 ◽  
Author(s):  
R.L. Bowen ◽  
H.H. Chandler
Keyword(s):  
Composite Materials ◽  
Physical Properties ◽  
Resin Composite ◽  
Metal Particles ◽  
Coupling Agents ◽  
Resin Composites

Certain physical properties of metal-filled resin composite materials can be improved if properly selected and applied coupling agents are used in treating the surfaces of the metal particles.

scholarly journals DEVELOPMENT OF RESOURCE-SAVING TECHNOLOGIES FOR OBTAINING COMPOSITE MATERIALS BASED ON THE USE OF OILSEED FLAX FIBERS

2021 ◽  
pp. 275-282
Author(s):  
Olga Gorach ◽  
Olena Dombrovska ◽  
Anastasiia Tikhosova
Keyword(s):  
Composite Materials ◽  
Chemical Composition ◽  
Raw Materials ◽  
Scientific Basis ◽  
Resource Saving ◽  
Flax Fibers ◽  
Scientific Substantiation ◽  
And Performance ◽  
Flax Straw

The article examines the ways to solve the problem of developing a scientific basis for obtaining composite materials of different functional purposes from oilseed flax fibers. The paper covers theoretical and experimental research in the area of processing flax raw materials. The purpose of the study is to provide scientific substantiation of developing the technologies for obtaining fillers to reinforce composite materials. In order to do it, we performed modification of oilseed flax fiber and developed technologies for processing oilseed flax straw with regulated technological and performance characteristics. The article also presents the results of the research on determining causes of low wettability of oilseed flax bast. In order to find out the causes of low bast wettability, we conducted research on examining chemical composition and anatomy of straw stems. The formulation for preparing the fiber aimed to be used as a filler for reinforcement of composite materials is offered. The study suggests evaluation of the quality of composite materials produced on the basis of using modified oilseed flax fibers.

scholarly journals Alumina matrix ceramic-nickel composites formed by centrifugal slip casting

2015 ◽  
Vol 9 (4) ◽  
pp. 199-202 ◽  
Author(s):  
Justyna Zygmuntowicz ◽  
Aleksandra Miazga ◽  
Katarzyna Konopka ◽  
Katarzyna Edrysiak ◽  
Waldemar Kaszuwara
Keyword(s):  
Composite Materials ◽  
Rotation Axis ◽  
Quantitative Description ◽  
Slip Casting ◽  
Metal Particles ◽  
Alumina Matrix ◽  
Casting Method ◽  
Composite Fabrication ◽  
Nickel Particles ◽  
Nickel Composites

The paper is focused on the possibility of fabricating the alumina matrix ceramic-nickel composites with gradient concentration of metal particles. Centrifugal slip casting method was chosen for the composite fabrication. This method allows fabrication of the graded distribution of nickel particles in the hollow cylinder composites. The horizontal rotation axis was applied. The samples were characterized by XRD, SEM and quantitative description of the microstructure. The macroscopic as well as SEM observations of the prepared composites confirmed the gradient concentration of Ni particles in the composite materials. The application of the centrifugal slip casting method allows for the graded distribution of metal particles in the samples.

Comparative Microstructures of Ion Milled and Electrochemically Thinned Composite Materials

1974 ◽  
Vol 32 ◽  
pp. 546-547
Author(s):  
R.R. Russell
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Composite Materials ◽  
Great Difficulty ◽  
Ion Milling ◽  
Transmission Electron ◽  
Ion Damage ◽  
Intermetallic Composite

Transmission electron microscopy of metallic/intermetallic composite materials is most challenging since the microscopist typically has great difficulty preparing specimens with uniform electron thin areas in adjacent phases. The application of ion milling for thinning foils from such materials has been quite effective. Although composite specimens prepared by ion milling have yielded much microstructural information, this technique has some inherent drawbacks such as the possible generation of ion damage near sample surfaces.

Electron Microscopy of the Shape of Small Metal Particles

1977 ◽  
Vol 35 ◽  
pp. 300-301
Author(s):  
M. Jose Yacaman
Keyword(s):  
Electron Microscopy ◽  
Metal Particle ◽  
Field Experiments ◽  
Size Range ◽  
Dark Field ◽  
Metal Particles ◽  
Bragg Condition ◽  
Crystal Particle ◽  
Small Metal Particle ◽  
Small Metal Particles

In the Study of small metal particles the shape is a very Important parameter. Using electron microscopy Ino and Owaga(l) have studied the shape of twinned particles of gold. In that work electron diffraction and contrast (dark field) experiments were used to produce models of a crystal particle. In this work we report a method which can give direct information about the shape of an small metal particle in the amstrong- size range with high resolution. The diffraction pattern of a sample containing small metal particles contains in general several systematic and non- systematic reflections and a two-beam condition can not be used in practice. However a N-beam condition produces a reduced extinction distance. On the other hand if a beam is out of the bragg condition the effective extinction distance is even more reduced.

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