scholarly journals Fabrication of Cu-W Nanocomposites by Integration of Self-Propagating High-Temperature Synthesis and Hot Explosive Consolidation Technologies

2018 ◽  
pp. 301
Author(s):  
S.V. Aydinyan ◽  
H.V. Kirakosyan ◽  
M.K. Zakaryan ◽  
L.S. Abovyan ◽  
S.L. Kharatyan ◽  
...  
Keyword(s):  
Internal Friction ◽  
Young Modulus ◽  
Internal Stresses ◽  
Composite Powders ◽  
High Temperature Synthesis ◽  
Measurement Results ◽  
Joint Reduction ◽  
Full Annealing ◽  
Explosive Consolidation ◽  
Improved Characteristics

Manufacturing W-Cu composite nanopowders was performed via joint reduction of CuO and WO3 oxides with various ratios (W:Cu = 2:1, 1:1, 1:3, 1:13.5) using combined Mg–C reducer. Combustion synthesis was used to synthesize homogeneous composite powders of W-Cu and hot explosive consolidation (HEC) technique was utilized to fabricate dense compacts from ultrafine structured W-Cu powders. Compact samples obtained from nanometer sized SHS powders demonstrated weak relation between the susceptibility and the applied magnetic field in comparison with the W and Cu containing micrometer grain size of metals. The density, microstructural uniformity and mechanical properties of SHS&HEC prepared samples were also evaluated. Internal friction (Q-1) and Young modulus (E) of fabricated composites studied for all samples indicated that the temperature 1000 °С is optimal for full annealing of microscopic defects of structure and internal stresses. Improved characteristics for Young modulus and internal friction were obtained for the W:Cu = 1:13.5 composite. According to microhardness measurement results, W-Cu nanopowders obtained by SHS method and compacted by HEC technology were characterized by enhanced (up to 85%) microhardness.

Young modulus and internal friction of a fiber‐reinforced composite

1986 ◽  
Vol 59 (6) ◽  
pp. 1972-1976 ◽  
Author(s):  
H. M. Ledbetter ◽  
Ming Lei ◽  
M. W. Austin
Keyword(s):  
Internal Friction ◽  
Young Modulus ◽  
Fiber Reinforced ◽  
Fiber Reinforced Composite ◽  
Reinforced Composite

scholarly journals Internal Friction and Young Modulus Behaviour of Hot-Rolled Cu-Al-Ni-Ti Shape Memory Alloys

1996 ◽  
Vol 06 (C8) ◽  
pp. C8-413-C8-416 ◽  
Author(s):  
E. Cesari ◽  
C. Seguí ◽  
J. Pons ◽  
F. Perelló
Keyword(s):  
Internal Friction ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Young Modulus ◽  
Hot Rolled

Characterization of Cr2O3-TiO2-CaF2 Coatings Using Plasma Spray Process

1997 ◽  
Author(s):  
A.Ph. Ilyuschenko ◽  
N.I. Shipica ◽  
P.A. Vityaz ◽  
A.A. Yerstak ◽  
A.Y. Beliaev
Keyword(s):  
Wear Resistance ◽  
Plasma Spray ◽  
Composite Coatings ◽  
Wear Testing ◽  
Material System ◽  
Composite Powders ◽  
Spray Coatings ◽  
Spray Process ◽  
Plasma Spray Coatings ◽  
High Temperature Synthesis

Abstract This paper presents the results of a study on the wear resistance of plasma spray coatings made from Cr2O3-TiO2-CaF2 powders. The composite powders used were produced by self-propagating high temperature synthesis. They were then applied under various conditions in order to optimize the material system, spray process, and application procedures. Based on the results of microstructural examination and wear testing, the thermally sprayed composite coatings have excellent wear resistance, good adhesion, and are self-lubricating at high temperatures.

Self-Propagating High-Temperature Synthesis of Si-SiC Composite Powder

2016 ◽  
Vol 675-676 ◽  
pp. 623-626 ◽  
Author(s):  
Tawat Chanadee ◽  
Sutham Niyomwas
Keyword(s):  
High Temperature ◽  
Composite Powder ◽  
Rice Husk Ash ◽  
Argon Atmosphere ◽  
Composite Powders ◽  
Temperature Synthesis ◽  
X Ray ◽  
High Temperature Synthesis ◽  
Silicon Silicon

Silicon-silicon carbide (Si-SiC) composite powders were synthesized by in-situ self- propagating high-temperature synthesis using rice husk ash (RHA)/carbon/Mg as precursors in argon atmosphere. The as-SHS powders were leached by two leaching steps. The microstructure and chemical composition of the obtained Si-SiC composite powders were examined using scanning electron microscope (SEM) and x-ray diffractometer (XRD), respectively.

Structure and Properties of Electron-Beam Coatings, Overlaid of SHS Composite Powders "TiC – Ti", Synthesized in Air

2016 ◽  
Vol 685 ◽  
pp. 719-723 ◽  
Author(s):  
Maxim G. Krinitcyn ◽  
Gennadii A. Pribytkov ◽  
Vasiliy G. Durakov
Keyword(s):  
Electron Beam ◽  
High Temperature ◽  
Structure And Properties ◽  
Composite Powders ◽  
Temperature Synthesis ◽  
X Ray ◽  
High Temperature Synthesis ◽  
Different Content ◽  
Carbide Particles

A structure of Ti-TiC coatings with different content of titanium binder, overlaid of composite powders, which were obtained by self-propagating high-temperature synthesis, was investigated. The structure was studied by X-ray analysis and metallography. A size of the carbide particles in coatings, hardness of coatings and rate of wear were measured.

scholarly journals Mechanism of self-propagating hightemperature synthesis of AlB2‒Al2O3

2019 ◽  
pp. 27-36
Author(s):  
Pan Yang ◽  
Guoqing Xiao ◽  
Donghai Ding ◽  
Yun Ren ◽  
Zhongwei Zhang ◽  
...  
Keyword(s):  
High Temperature ◽  
Ignition Temperature ◽  
Combustion Reaction ◽  
Peritectic Temperature ◽  
Composite Powders ◽  
Temperature Synthesis ◽  
Precipitation Mechanism ◽  
High Temperature Synthesis ◽  
Higher Temperature ◽  
Quenching Method

The mechanism of self-propagating high-temperature synthesis (SHS) of AlB2‒Al2O3 composite powders was studied by means of a combustion front quenching method (CFQM). The results showed that combustion reaction started with the melting of B2O3 and Al particles. As the combustion reaction proceeded, the interpenetration of Al and B2O3 in melts happened. The XRD results of the product revealed the reflections of Al2O3, suggesting there had been an exchange of oxygen atoms between Al and B, and evidencing the reaction, B2O3 (l) + 2Al (l) → 2B (s) + Al2O3 (l). Under higher temperature, some of B2O3 volatilized and reacted with B forming gaseous B2O2, which deposited on the surface of Al to precipitate Al2O3 and B. Then B made available dissolved into Al melt, and reacted with the Al in melt to precipitate AlB12 particles. Finally, AlB12 transforms to AlB2 at the peritectic temperature under high cooling rate. Thus, this combustion reaction can be described by the dissolution-precipitation mechanism. In the final products, besides AlB2 and Al2O3 particles, some of Al was also detected. A model corresponding to the dissolutionprecipitation mechanism was proposed, and the ignition temperature of the combustion reaction was determined to be around 800 °C. Ill. 13. Ref. 47.

Fabrication of «TiC-HSS Steel Binder» Composite Powders by Self-Propagating High Temperature Synthesis

2016 ◽  
Vol 712 ◽  
pp. 195-199 ◽  
Author(s):  
Elena N. Korosteleva ◽  
Gennadii A. Pribytkov ◽  
Maxim G. Krinitcyn ◽  
Anton V. Baranovskii ◽  
Victoria V. Korzhova ◽  
...  
Keyword(s):  
Mass Transfer ◽  
High Speed ◽  
Titanium Powder ◽  
High Speed Steel ◽  
Combustion Mode ◽  
Final Phase ◽  
Composite Powders ◽  
Temperature Synthesis ◽  
High Temperature Synthesis ◽  
Shs Method

The phase composition, microstructure and morphology of composite powders «TiC-HSS steel binder» obtained by the SHS method in layerwise combustion mode have been studied. Titanium powder, carbon (carbon black) in a ratio corresponding to equiatomic titanium carbide and high speed steel as a thermally inert binder was used as a reaction mixture. It was found that the mass transfer of reaction mixture components between the carbide and metal binder was taking place during synthesis, as a result of which the final phase and elemental composition of the synthesis products was formed. It is shown that the volume content of thermally inert binder significantly affects the dispersion of the formed carbide phase.

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