scholarly journals Conditions for Production of Composite Material Based on Aluminum and Carbon Nanofibers and Its Physic-Mechanical Properties

Nanomaterials ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 550 ◽  
Author(s):  
Oleg Tolochko ◽  
Tatiana Koltsova ◽  
Elizaveta Bobrynina ◽  
Andrei Rudskoy ◽  
Elena Zemtsova ◽  
...  
Keyword(s):  
Carbon Nanofibers ◽  
Carbon Nanostructures ◽  
Pure Aluminum ◽  
Metallic Matrix ◽  
Chemical Vapor ◽  
Matrix Composites ◽  
Mechanically Alloyed ◽  
Alumina Particles ◽  
Composite Microstructure

Aluminum-based metallic matrix composites reinforced by carbon nanofibers (CNFs) are important precursors for development of new light and ultralight materials with enhanced properties and high specific characteristics. In the present work, powder metallurgy technique was applied for production of composites based on reinforcement of aluminum matrices by CNFs of different concentrations (0~2.5 wt%). CNFs were produced by chemical vapor deposition (CVD) and mechanical activation. We determined that in situ synthesis of carbon nanostructures with subsequent mechanic activation provides satisfactory distribution of nanofibers and homogeneous composite microstructure. Introduction of 1 vol% of flux (0.25 NaCl + 0.25 KCl + 0.5 CaF2) during mechanic activation helps to reduce the strength of the contacts between the particles. Additionally, better reinforcement of alumina particles and strengthening the bond between CNFs and aluminum are observed due to alumina film removal. Introduction of pure aluminum into mechanically alloyed powder provides the possibility to control composite durability, plasticity and thermal conductivity.

The Synthesis of CNTs over Hydroxyapatite by CVD and the Preparation of CNTs/HA in Situ Composite

2011 ◽  
Vol 704-705 ◽  
pp. 790-795
Author(s):  
Hai Peng Li ◽  
Li Hui Wang ◽  
Chun Yong Liang ◽  
Hong Shui Wang
Keyword(s):  
Transition Metal ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Metal Catalyst ◽  
Matrix Composites ◽  
Transition Metal Catalyst ◽  
Catalyst Carrier ◽  
Fe Catalyst ◽  
Selection Of

Carbon nanotubes (CNTs) over hydroxyapatite (HA) as catalyst carrier were synthesized successfully using transition metal by chemical vapor deposition (CVD). The influences of catalyst types on the synthesis of CNTs were investigated when using Fe, Co and Ni as transition metal catalyst respectively. The results showed that CNTs synthesized by Fe catalyst normally possess more ideal morphology and higher crystallinity than those by the other two. But the yield rates of CNTs synthesized by CVD were in the order of Ni>Fe>Co. On the basis of this, HA matrix composites reinforced by CNTs in-situ were prepared and their mechanical properties were studied preliminarily. This study supplies valuable information for controlling the property of CNTs/HA composite by the selection of catalyst.

Synthesis of the in situ aluminum matrix composite through pyrolysis of high temperature vulcanization silicone

2017 ◽  
Vol 52 (1) ◽  
pp. 123-134 ◽  
Author(s):  
Mohammad Senemar ◽  
Behzad Niroumand ◽  
Ali Maleki ◽  
Pradeep K Rohatgi
Keyword(s):  
High Temperature ◽  
High Temperatures ◽  
Pure Aluminum ◽  
Aluminum Matrix ◽  
Aluminum Matrix Composite ◽  
Aluminum Matrix Composites ◽  
Matrix Composites ◽  
Commercially Pure ◽  
The Matrix

In this study, in situ aluminum matrix composites were synthesized through pyrolysis of high temperature vulcanization silicone in commercially pure aluminum melt. For this purpose, 1 to 4 wt% of high temperature vulcanization silicone was added to a vortex of molten aluminum at 750℃ and the resulting slurries were cast in steel dies. Microstructure, hardness, and tensile properties of the as-cast samples were examined at ambient and high temperatures. The results revealed the in situ formation and distribution of reinforcement particles in the matrix. Energy-dispersive X-ray analysis indicated that the formed reinforcement particles consisted of O and Si elements. This confirms the in situ reinforcement formation by pyrolysis of high temperature vulcanization silicone in the melt. The size of the in situ formed particles was mostly in the range of 200–2000 nm. It was shown that the composites synthesized by the addition of 4 wt% high temperature vulcanization had the highest mechanical properties both at ambient and high temperatures. Room temperature hardness, tensile strength, and yield strength of this sample were increased by about 50%, 23%, and 19% compared to the monolithic sample, respectively.

scholarly journals Study on the Microstructure and Wear Behavior of In-Situ Al3Ti/Al Composites Under Induction Heating

2021 ◽  
Author(s):  
Yuting YAN ◽  
Libin NIU ◽  
Anwen ZHANG ◽  
Chengxin LIU ◽  
Zhidong FAN ◽  
...  
Keyword(s):  
Induction Heating ◽  
Wear Behavior ◽  
Pure Aluminum ◽  
Initial Position ◽  
Synthesis Methods ◽  
Matrix Composites ◽  
Particle Spacing ◽  
The Matrix ◽  
Al Matrix Composites

In the study, Ti fiber (200 μm, 99.8 wt.%) and pure aluminum (99.6 wt.%) were respectively used as the reaction source and matrix to prepare Al-based composites by in-situ synthesis methods. During the stage of preparing the preform, Ti fibers were fixed in the matrix at equal intervals to pre-control the initial position of the product. The preform was heated in an induction heating device finally, at the same time, parameter combinations of different frequencies and currents were applied to promote the in-situ reaction between Al-Ti, thereby the Al matrix composites reinforced by Al3Ti were obtained. The phase composition, microstructure and wear resistance of the composites were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and wear testers. The results show that when the frequency and current are 5 kHz and 15 A respectively, the Ti fiber is completely reacted, and the product is the isometric Al3Ti with a size of 1 – 2 μm and a particle spacing of about 5 μm, reaching the optimal microstructure under all parameters. Under the condition of a load of 9.8 N, the wear rate of the composites at 5 kHz and 15 A is 2.325 mg/mm2, indicating the best values in this experiment.

scholarly journals Role of Carbon Nanofiber on the Electrical Resistivity of Mortar under Compressive Load

2020 ◽  
pp. 036119812094741
Author(s):  
Thanyarat Buasiri ◽  
Karin Habermehl-Cwirzen ◽  
Lukasz Krzeminski ◽  
Andrzej Cwirzen
Keyword(s):  
Electrical Resistivity ◽  
Portland Cement ◽  
Carbon Nanofibers ◽  
Ordinary Portland Cement ◽  
Carbon Nanofiber ◽  
Compressive Load ◽  
Chemical Vapor ◽  
Load Sensing

A nanomodified cement consisting of particles with in situ synthesized carbon nanofibers was developed to introduce a strong load-sensing capability of the hydrated binder matrix. The material was produced using chemical vapor deposition. The nanomodified cement contained 2.71 wt% of carbon nanofibers (CNFs). The electrical properties of the composite were determined. Several mortar samples were prepared by partially substituting ordinary Portland cement with 2, 4, 6, 8, and 10 wt% of the nanomodified cement. Additionally an ordinary Portland cement mortar was used as reference. The results show that the strongest piezoresistive response and therefore the best load-sensing was obtained for the mortar containing the highest amount of CNFs. This mortar contained 10 wt% of nanomodified cement. The fractional change in electrical resistivity of this mortar was 82% and this mortar had a compressive strength of 28 MPa.

Carbon nanostructures formed on mesoporous silica by catalytic chemical vapor deposition of ethene

2008 ◽  
Vol 23 (2) ◽  
pp. 435-443 ◽  
Author(s):  
Lingxia Zhang ◽  
Jianlin Shi ◽  
Jiangtian Li ◽  
Zile Hua ◽  
Meiling Ruan
Keyword(s):  
Mesoporous Silica ◽  
Vapor Deposition ◽  
Carbon Nanostructures ◽  
Chemical Vapor ◽  
Coupling Agents ◽  
In Situ Reduction ◽  
Silane Coupling Agents ◽  
Wet Impregnation ◽  
Silane Coupling

Three different strategies, wet impregnation, in situ reduction, and grafting with silane coupling agents, have been used to introduce CoNi nanoparticles with different existing forms into mesoporous silica. These composites were used as catalysts to grow nanostructured carbons by catalytic chemical vapor deposition using ethene. Carbon nanotubes (CNTs) with different inner diameters can grow out of mesoporous silica particles incorporated with CoNi nanoclusters. Many fewer CNTs could be found in the pore channels of the sample prepared by using silane coupling agents than in those of the sample synthesized via wet impregnation. No CNTs formed in the pore channels of the sample prepared by in situ reduction. After the removal of silica, different carbon nanostructures have been obtained in the pore channels. Ordered graphite carbon mesostructure was obtained from the sample prepared by in situ reduction. Highly dispersed metal catalysts inside mesopore channels are favorable for the formation of graphite carbons with ordered mesostructures.

scholarly journals Characterization of in Situ Zirconium Diboride (Zrb2) Reinforced by Aluminium-Copper (Al-Cu) Metal Matrix Composites

2019 ◽  
Vol 7 (4.14) ◽  
pp. 406
Author(s):  
N. H. Mustafa ◽  
N. N. A. Basir ◽  
R. E. Ibrahim ◽  
M. M. Mahat ◽  
N. N. Bonnia ◽  
...  
Keyword(s):  
Phase Distribution ◽  
Microstructural Analysis ◽  
Metallic Matrix ◽  
Ex Situ ◽  
Homogeneous Distribution ◽  
Second Phase ◽  
Matrix Composites ◽  
In Situ Reaction ◽  
Clean Interface

Aluminium matrix composites by way of in-situ reaction has arisen as a preference conducive to knock out imperfections and defects exiting within ex situ MMC. In the present work, Al-Cu-ZrB2 have been develop through in situ reaction which boost mechanical properties over dispersion strengthening together with grain refinement obtained by the existence of each particulates inside the melt all along solidification. Al-Cu reinforced among different proportion of ZrB2 (0, 3 and 6 wt. %) synthesized using in situ fabrication at 800 °C of molten aluminum-copper alloys by inorganic salts K2ZrF6 together with KBF4. The amalgam were specified using XRD, FESEM together with mechanical test on appropriately sectioned and metallographically prepared surface to examine and inspect phase distribution, hardness together with tensile properties. From result acquired, raised ZrB2 amount will increase rate of tensile and hardness characteristics of Al-Cu alloy. XRD patterns exposed development of ZrB2 particulates without existence of unspecified other compounds. Most of ZrB2 granular were located near grain boundaries of Al dendrites. Microstructural analysis exposed the homogeneous and consistent allocation of second phase particles, clean interface and favorable bonding. It is support that ZrB2 molecules are predominantly in nano size among hexagonal either tetragonal shape, yet minor molecules in micron size are also noticed. For that reason, composite synthesized using in situ techniques exhibit homogeneous distribution of reinforcing tend to be superlative associated within clean interface along the metallic matrix. In order to accomplish better mechanical features, it is necessary to regulate and control phase arrangement all along fabrication of Al-Cu with higher contents of ZrB2.  

scholarly journals In situ fabrication of dendritic tin-based carbon nanostructures for hydrogen evolution reaction

2020 ◽  
Vol 4 (10) ◽  
pp. 5223-5228
Author(s):  
Oluwafunmilola Ola ◽  
Yu Chen ◽  
Kunyapat Thummavichai ◽  
Yanqiu Zhu
Keyword(s):  
Chemical Vapor Deposition ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Vapor Deposition ◽  
Carbon Nanostructures ◽  
Chemical Vapor ◽  
Chemical Vapor Deposition Method ◽  
Deposition Method ◽  
In Situ Fabrication

In this work, dendritic tin-based carbon nanostructures with different morphologies were synthesized by a facile two-step carbonization and chemical vapor deposition method and were then evaluated for their performance in hydrogen evolution reaction.

Fabrication of (Al2O3-Al3Nb)/Al Composite Materials by In-Situ Reaction Using MA Processed Al/Nb2O5 Powder

2010 ◽  
Vol 654-656 ◽  
pp. 2931-2934
Author(s):  
Hyun Bom Lee ◽  
Hiroyasu Tezuka ◽  
Equo Kobayashi ◽  
Tatsuo Sato ◽  
Kee Do Woo
Keyword(s):  
Intermetallic Compound ◽  
Matrix Composites ◽  
Mechanically Alloyed ◽  
In Situ Reaction ◽  
Al Composite ◽  
Specific Temperature ◽  
By Products ◽  
Matrix Powder ◽  
Al Matrix

A planetary ball milling (PBM) technique was employed to fabricate mechanically alloyed (MA processed) Al-Nb2O5 composite powder. Nano or sub-micron sized Nb2O5 particles were homogeneously embedded in the Al particles after milling for various periods. None of cracks, by-products and pores were observed in the areas between embedded Nb2O5 particulates and Al matrix powder after milling. The sequence of the in-situ reaction was confirmed by DSC, XRD measurements, optical microscopy and EPMA. The specific temperature of the in-situ reaction was between 650 and 700°C. Al-based metal matrix composites (MMC) reinforced with the sub-sieve sized θ-Al2O3 particulates and Al3Nb intermetallic compound were successfully fabricated by the in-situ reaction process. The substituted Nb by the in-situ reaction was fully reacted with Al to form the Al3Nb intermetallic compound during sintering. A number of sub-sieve sized θ-Al2O3 particulates and Al3Nb intermetallic compound formed by the in-situ reaction between Al and Nb2O5 were homogeneously distributed in the Al matrix during sintering. Nano sized θ-Al2O3 particulates are preferentially distributed near the Al3Nb intermetallic compound and no by-products are formed in the interfaces with the Al matrix.

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