scholarly journals Chemical Method of Receipt of Powder-Like Mixtures of Copper Crystals (Cu) -Nano, Micro Dispersion of for Reinforcement of Polymeric Compositions are Used as Materials for Printing 3D

2016 ◽  
Vol 17 (2) ◽  
pp. 269-274
Author(s):  
М.V. Gorenko
Keyword(s):  
Mechanical Properties ◽  
Crystal Structures ◽  
Copper Powder ◽  
Chemical Process ◽  
Chemical Method ◽  
Crystallization Process ◽  
Powder Mixtures ◽  
Polymeric Compositions ◽  
Extrusion Method ◽  
Copper Crystals

We consider possibility of the chemical process of obtaining crystals of copper powder mixtures -nano, micro dispersion of for reinforcement of polymeric compositions are used as materials for printing 3D thermo-extrusion method, is given determination the physic and to mechanical properties of the resulting material, depending on the filler, we offer a method to reduce the porosity of products for the SLS technology, DMLS,investigated kinds of crystal structures of copper (Cu) and crystallization process copper (Cu) with -nano phase in solution H2O.

Effects of Sintering and Compress on Porosity, Mechanical Properties and Conductivity of Cu-Al2O3 Composite Materials Fabricated by Mechano-Chemical Method

2019 ◽  
Vol 889 ◽  
pp. 33-37
Author(s):  
Ho Ky Thanh ◽  
Duc Duy Nguyen ◽  
Tran Van Dung
Keyword(s):  
Mechanical Properties ◽  
Composite Materials ◽  
Chemical Process ◽  
Chemical Method ◽  
Particle Sizes ◽  
Xrd Pattern ◽  
Sintering Time ◽  
Properties Of Materials ◽  
Cold Pressed ◽  
Cylindrical Samples

Nano Al2O3 dispersion - strengthened Cu-matrix composite materials were fabricated by mechano-chemical method. The method carries out at room temperature by mechanical milling in the attritor in 16h hours using the mixtures of CuO, Al and Cu powder ingredients, and then the mixtures were cold pressed into cylindrical samples and sintered at various temperatures (from 700°C to 900°C) and time (from 1 to 3 hours) in argon atmosphere. The XRD pattern and EDS results revealed that Al2O3 phases were formed and dispersed into Cu-matrix during mechano-chemical process. The Al peak disapeared at the end of mechano-chemical process and the final obtained products were Cu-Al2O3 composite materials with Al2O3 content of 3-10% volume. The SEM and EDS results also showed that the particle sizes of Al2O3 were in about (50÷100)nm and uniformly dispersed within the C-matrix. The porosity of materials strongly depends on pressure compress, sintering time and temperature. It decreases with increasing of these parameters and reaches about 5%. The porosity and Al2O3 content affected on mechanical properties of materials, such as micro-hardness and compress strength, due to the dispersion of nano-Al2O3 into Cu-matrix. The conductivity of materials decreases with increasing porosity and Al2O3 content.

scholarly journals The crystal structures and mechanical properties of the uranyl carbonate minerals roubaultite, fontanite, sharpite, widenmannite, grimselite and čejkaite

2020 ◽  
Vol 7 (21) ◽  
pp. 4197-4221 ◽  
Author(s):  
Francisco Colmenero ◽  
Jakub Plášil ◽  
Jiří Sejkora
Keyword(s):  
Mechanical Properties ◽  
Hydrogen Bonding ◽  
Diffraction Pattern ◽  
Crystal Structures ◽  
First Principles ◽  
X Ray Diffraction ◽  
Carbonate Minerals ◽  
X Ray ◽  
Uranyl Carbonate

The structure, hydrogen bonding, X-ray diffraction pattern and mechanical properties of six important uranyl carbonate minerals, roubaultite, fontanite, sharpite, widenmannite, grimselite and čejkaite, are determined using first principles methods.

scholarly journals Conversion of Lignocellulosic Biomass to Nanocellulose: Structure and Chemical Process

2014 ◽  
Vol 2014 ◽  
pp. 1-20 ◽  
Author(s):  
H. V. Lee ◽  
S. B. A. Hamid ◽  
S. K. Zain
Keyword(s):  
Molecular Structure ◽  
Mechanical Properties ◽  
Lignocellulosic Biomass ◽  
Chemical Process ◽  
Catalyst Design ◽  
Natural Resistance ◽  
Cellulose Crystallinity ◽  
Biomass Recalcitrance ◽  
Cellulose Accessibility ◽  
High Cellulose

Lignocellulosic biomass is a complex biopolymer that is primary composed of cellulose, hemicellulose, and lignin. The presence of cellulose in biomass is able to depolymerise into nanodimension biomaterial, with exceptional mechanical properties for biocomposites, pharmaceutical carriers, and electronic substrate’s application. However, the entangled biomass ultrastructure consists of inherent properties, such as strong lignin layers, low cellulose accessibility to chemicals, and high cellulose crystallinity, which inhibit the digestibility of the biomass for cellulose extraction. This situation offers both challenges and promises for the biomass biorefinery development to utilize the cellulose from lignocellulosic biomass. Thus, multistep biorefinery processes are necessary to ensure the deconstruction of noncellulosic content in lignocellulosic biomass, while maintaining cellulose product for further hydrolysis into nanocellulose material. In this review, we discuss the molecular structure basis for biomass recalcitrance, reengineering process of lignocellulosic biomass into nanocellulose via chemical, and novel catalytic approaches. Furthermore, review on catalyst design to overcome key barriers regarding the natural resistance of biomass will be presented herein.

Effect of Small Iron, Chromium and Boron Additions as Alloying Elements on Microstructure and Mechanical Properties of Ni3Al

2007 ◽  
Vol 23 ◽  
pp. 123-126
Author(s):  
Radu L. Orban ◽  
Mariana Lucaci
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Room Temperature ◽  
Alloying Elements ◽  
Alloyed Powder ◽  
Mechanically Alloyed ◽  
Powder Mixtures ◽  
B Additions ◽  
Strength And Ductility ◽  
Iron Chromium

This paper investigates the effect of Fe, Cr and B additions, in small proportions, as alloying elements in Ni3Al with the purpose to reduce its intrinsic fragility and extrinsic embrittlement and to enhance, in the same time, its mechanical properties. It represents a development of some previous research works of the authors, proving that Ni3Al-Fe-Cr-B alloys obtained by reactive synthesis (SHS) starting from Mechanically Alloyed powder mixtures have superior both room temperature tensile strength and ductility, and compression ones at temperatures up to 800 °C, than pure Ni3Al. These create premises for their using as superalloys substitutes.

Effect of Temperature on the Structure and Mechanical Properties of Mechanically Alloyed Al-Nio Composite

2014 ◽  
Vol 59 (1) ◽  
pp. 121-126
Author(s):  
M. Zygmunt-Kiper ◽  
L. Blaz ◽  
M. Sugamata
Keyword(s):  
Mechanical Properties ◽  
Aluminum Oxide ◽  
Aluminum Matrix ◽  
Hot Extrusion ◽  
Effect Of Temperature ◽  
Compression Tests ◽  
Mechanically Alloyed ◽  
Structure Morphology ◽  
High Purity Aluminum ◽  
Extrusion Method

Abstract Mechanical alloying of high-purity aluminum and 10 wt.% NiO powders combined with powder vacuum compression and following hot extrusion method was used to produce an Al-NiO composite. Mechanical properties of as-extruded materials as well as the samples annealed at 823 K /6 h, were tested by compression at 293 K - 770 K. High mechanical properties of the material were attributed to the highly refined structure of the samples. It was found that the structure morphology was practically not changed during hot-compression tests. Therefore, the effect of deformation temperature on the hardness of as-deformed samples was very limited. The annealing of samples at 823 K/6 h induced a chemical reaction between NiO-particles and surrounding aluminum matrix. As a result, the development of very fine aluminum oxide and Al3Ni grains was observed.

Development of technology for processing of chip wastes made of Al—Mg—Sc system alloy using hot extrusion method

2021 ◽  
pp. 123-129
Author(s):  
N.N. Zagirov ◽  
Yu.N. Loginov ◽  
E.V. Ivanov ◽  
V.G. Kuz’min
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Production Process ◽  
Liquid State ◽  
Hot Extrusion ◽  
Technological Scheme ◽  
System Alloy ◽  
Chip Processing ◽  
Extrusion Method

The problem of chip processing of aluminum alloy containing scandium is considered. The difficulty of remelting due to easy oxidation of the alloy components is noted. It is proposed to dispose of the shavings without transferring the metal to liquid state. The aim of the work is to construct technological scheme for the processing of waste chips of the Al—Mg—Sc alloy formed as result of machining cast billets by cutting. Results of experiments including cold briquetting, hot extrusion and drawing are presented. The mechanical properties of the product obtained according to several variants of the technological scheme are measured. The possibility of continuous drawing of semi-finished product is shown. The conclusion is made about the possibility of using the scheme in the production process.

Research of Treatment Technology for Electroplating Wastewater

2014 ◽  
Vol 487 ◽  
pp. 713-716 ◽  
Author(s):  
Yi Dan Zhou ◽  
Miao Sun ◽  
Li Juan Wang ◽  
Guan Nan Xi
Keyword(s):  
Waste Water ◽  
Wastewater Treatment ◽  
Electrochemical Method ◽  
Chemical Process ◽  
Biological Treatment ◽  
Chemical Method ◽  
Treatment Technology ◽  
Electroplating Wastewater ◽  
The Common ◽  
Physical And Chemical

The sources and composition of electroplating waste water are summarized. The common wastewater treatment technology, such as physical and chemical method, physic-chemical process, biological treatment and electrochemical method, and so on. Then the vision for the development of electroplating wastewater treatment technology is made.

The crystallization process, microstructure, martensitic transformation and mechanical properties of Ti-Ni-Zr alloy ribbons

2019 ◽  
Vol 778 ◽  
pp. 542-553 ◽  
Author(s):  
Xiaoyang Yi ◽  
Haizhen Wang ◽  
Bin Sun ◽  
Kuishan Sun ◽  
Weihong Gao ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Martensitic Transformation ◽  
Crystallization Process ◽  
Zr Alloy

scholarly journals Effect of Cr and W on the Crystallization Process, the Microstructure and Properties of Hypoeutectic Silumin to Pressure Die Casting

2016 ◽  
Vol 16 (3) ◽  
pp. 109-114 ◽  
Author(s):  
T. Szymczak ◽  
G. Gumienny ◽  
T. Pacyniak
Keyword(s):  
Mechanical Properties ◽  
Crystallization Process ◽  
Die Casting ◽  
Intermetallic Phase ◽  
Small Extent ◽  
Metallographic Analysis ◽  
Higher Temperature ◽  
Dta Studies ◽  
Pressure Die Casting ◽  
Additional Phase

Abstract This article presents the results of studies in the hypoeutectic silumin destined for pressure die casting with the simultaneous addition of chromium and tungsten. The study involved the derivative and thermal analysis of the crystallization process, metallographic analysis and mechanical properties testing. Silumin 226 grade was destined for studies. It is a typical silumin to pressure die casting. AlCr15 and AlW8 preliminary alloys were added to silumin. Its quantity allowed to obtain 0.1, 0.2, 0.3 and 0.4% of Cr and W in the tested alloy. Studies of the crystallization process as well as the microstructure of the silumin poured into DTA sampler allowed to state the presence of additional phase containing 0.2% or more Cr and W. It has not occurred in silumin without the addition of above mentioned elements. It is probably the intermetallic phase containing Cr and W. DTA studies have shown this phase crystallizes at a higher temperature range than α (Al) solid solution. In the microstructure of each pressure die casting containing Cr and W the new phases formed. Mechanical properties tests have shown Cr and W additives in silumin in an appropriate amount may increase its tensile strength Rm (about 11%), the yield strength Rp0.2 (about 21%) and to a small extent elongation A.

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