scholarly journals Influence of Surfactants on the Characteristics of Nickel Matrix Nanocomposite Coatings

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Abbas Fahami ◽  
Bahman Nasiri-Tabrizi ◽  
Mohsen Rostami ◽  
Reza Ebrahimi-Kahrizsangi
Keyword(s):  
Silicon Carbide ◽  
Average Particle Size ◽  
Nanocomposite Coatings ◽  
Average Particle ◽  
Nickel Matrix ◽  
Weight Percentage ◽  
Carbon Particles ◽  
Nickel Silicon ◽  
Electrochemical Plating ◽  
Matrix Nanocomposite

Nickel-based nanocomposite coatings were prepared from a Watts-type electrolyte containing reinforcement’s particles (silicon carbide and graphite) to deposit onto the steel St-37 substrate. The electrochemical plating of the coatings in absence and presence of surfactants and reinforcements particles was carried out to optimize high quality coatings with appropriate mechanical and morphological features. The surfactants such as cetyltrimethylammonium bromide (CTAB), sodyumdodecyl sulfate (SDS), and saccharine affected electrodeposition plating and subsequently changed mechanical characteristics. Based on XRD results, the dominant phases in the absence of surfactants were nickel oxide (NiO), nickel, and silicon carbide (SiC), while the main phases in presence of surfactants were nickel (Ni) and SiC. The hardness of the resultant coatings was found to be from 332 to 593 (Hv) depending on the bath parameter and the reinforcements weight percentage (wt%) in the Ni matrix. Microscopic observations illustrated a cluster-like structure which consisted of some fine sphere particulates with average particle size of 65–150 nm. According to elemental mapping spectra, a homogenous distribution of nickel, silicon, and carbon particles appeared into the nickel matrix coating. Finally, the experimental outcomes demonstrated that the surfactants have significant influence on the composition of coatings, surface morphology, and mechanical properties.

Fabrication of silicon carbide nanoceramics

1996 ◽  
Vol 11 (7) ◽  
pp. 1601-1604 ◽  
Author(s):  
Mamoru Mitomo ◽  
Young-Wook Kim ◽  
Hideki Hirotsuru
Keyword(s):  
Silicon Carbide ◽  
Particle Size ◽  
Deformation Behavior ◽  
Superplastic Deformation ◽  
Average Particle Size ◽  
Liquid Phase Sintering ◽  
Carbide Powder ◽  
Average Particle ◽  
Average Grain Size ◽  
Silicon Carbide Powder

Ultrafine silicon carbide powder with an average particle size of 90 nm was densified by hot-processing with the addition of Al2O3, Y2O3, and CaO at 1750 °C. Silicon carbide nanoceramics with an average grain size of 110 nm were prepared by liquid phase sintering at low temperature. The materials showed superplastic deformation at a strain rate of 5.0 × 10-4/s at 1700 °C, which is the lowest temperature published. The microstructure and deformation behavior of materials from a submicrometer powder were also investigated as a reference.

Tensile Properties, Hardness and Micro Structural Analysis of Al 6061 – SiCP Metal Matrix Composites Fabricated by Ultrasonic Cavitation Approach

2012 ◽  
Vol 622-623 ◽  
pp. 1275-1279
Author(s):  
L. Poovazhagan ◽  
K. Kalaichelvan ◽  
D. Shanmugasundaram
Keyword(s):  
Structural Analysis ◽  
Metal Matrix Composites ◽  
Metal Matrix ◽  
Average Particle Size ◽  
Ultrasonic Cavitation ◽  
Average Particle ◽  
Matrix Composites ◽  
Weight Percentage ◽  
Al 6061 ◽  
Wide Range

The combined use of ultrasonic cavitation and mechanical stirring to disperse the silicon carbide particles (SiCp) in molten aluminum alloys has been studied. Composite materials with various weight percentage of Al 6061 alloy (matrix) and SiCp (reinforcement, average particle size 10 micrometers) were fabricated. The microstructure of the composites was investigated by optical microscopy (OM) and scanning electron microscopy (SEM). The micro structural analysis validates the good dispersion of SiCp in the metal matrix. The tension test results reveal that the tensile strength of the as-cast metal matrix composites (MMCs) have been improved significantly for the 5 and 10 weight percentage of SiCp and then decreases. The hardness of MMCs increases and the ductility decreases as the particle percentage increases. The ultrasonic cavitation based fabrication is a novel route for producing wide range of MMCs.

scholarly journals Development of 3D Slurry Printing Technology with Submersion-Light Apparatus in Dental Application

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7873
Author(s):  
Cho-Pei Jiang ◽  
M Fahrur Rozy Hentihu ◽  
Yung-Chang Cheng ◽  
Tzu-Yi Lei ◽  
Richard Lin ◽  
...  
Keyword(s):  
Particle Size ◽  
Average Particle Size ◽  
Holding Time ◽  
Average Particle ◽  
Powder Particle Size ◽  
Green Body ◽  
Zirconia Powder ◽  
Printing Technology ◽  
Weight Percentage ◽  
Sintered Part

This study proposes an innovative three-dimensional printing technology with submersion-light apparatus. A zirconia powder with an average particle size of 0.5 µm is mixed with 1,6-Hexanediol diacrylate (HDDA) and photo-initiator to form a slurry. The weight percentage of zirconia powder to HDDA is 70:30 wt.%. A light engine box is submerged in a slurry and emits a layered pattern to induce photopolymerization and transform a slurry into a printed green body. Green body sintering parameters for the first and second stages are 380 °C with a holding time of 1.5 h and 1550 °C with a holding time of 2 h. The sintered parts’ length, width, and height shrinkage ratios are 29.9%, 29.7%, and 30.6%. The ball milling decreases the powder particle size to 158 ± 16 nm and the mean grain size of the sintered part is 423 ± 25 nm. The sintered part has an average hardness of 1224 (HV), a density of 5.45 g/cm3, and a flexural strength of 641.04 MPa. A three-unit zirconia dental bridge also has been fabricated with a clinically acceptable marginal gap.

scholarly journals Self-Propagating High-Temperature Synthesis of Silicon Carbide and Silicon Nitride Nanopowders Composition using Sodium Azide and Halides

2013 ◽  
Vol 16 (1) ◽  
pp. 41 ◽  
Author(s):  
Yu.V. Titova ◽  
A.P. Amosov ◽  
G.V. Bichurov ◽  
D.A. Maidan
Keyword(s):  
Silicon Carbide ◽  
High Temperature ◽  
Silicon Nitride ◽  
Combustion Synthesis ◽  
Sodium Azide ◽  
Average Particle Size ◽  
Average Particle ◽  
Temperature Synthesis ◽  
High Temperature Synthesis ◽  
Working Volume

<p>Regularities of self-propagating high-temperature synthesis (SHS) or combustion synthesis (CS) by using “silicon – sodium azide – ammonium hexafluorosilicate – carbon – aluminum” powder mixture in the nitrogen atmosphere were investigated. The thermodynamic analysis of the combustion synthesis was performed. Experimental investigation of the combustion process: the measurement of linear rates of the combustion front propagation and the maximum combustion temperatures was conducted in a laboratory reactor with working volume 4.5 liters. The influence of the components ratio in the initial mixture on the combustion temperature, combustion rate and composition of reaction product was studied. The phase composition of the product synthesized was determined with an X-ray  diffractometer. It was disclosed that the SHS product consists of the composition (mixture) of silicon carbide nanopowder with silicon nitride whiskers and a final halide. Investigation of surface topography and morphology of the product particles was carried out with a scanning electron microscope. Optimal mixture for the synthesis of nanoscale composition based on silicon carbide was determined: “14Si+6NaN<sub>3</sub>+(NH<sub>4</sub>)<sub>2</sub>SiF<sub>6</sub>+15C+Al”. In this case, the SHS product consists of four phases: silicon carbide (β-SiC) – 48.57 wt.%, α-silicon nitride (<em>α</em>-Si<sub>3</sub>N<sub>4</sub>) – 27.04 wt.%, β-silicon nitride (β-Si<sub>3</sub>N<sub>4</sub>) – 5.83 wt.%, and sodium hexafluoroaluminate (Na<sub>3</sub>AlF<sub>6</sub>) – 18.56 wt.%. The average particle size of the composition was in the range of 70–130 nm. It was shown that the composition of the silicon carbide with silicon nitride and the final halide Na<sub>3</sub>AlF<sub>6</sub> playing a role a flux can be used as a modifier of castable aluminum alloys and as a reinforcing phase of aluminomatrix composites.</p>

Fabrication of Bioactive Apatite Nuclei-Precipitated Titanium Alloys by Using Sandblasting

2012 ◽  
Vol 529-530 ◽  
pp. 553-558 ◽  
Author(s):  
Hiroshi Mizuno ◽  
Takeshi Yabutsuka ◽  
Takeshi Yao
Keyword(s):  
Silicon Carbide ◽  
Particle Size ◽  
Average Particle Size ◽  
Average Particle ◽  
Mechanical Interlocking ◽  
Alloy Plate ◽  
Ti Alloys ◽  
Silicon Carbide Particles ◽  
Carbide Particles ◽  
High Adhesive Strength

Micropores were formed on the surface of Ti metal, Ti-15Mo-5Zr-3Al alloy, Ti-12Ta-9Nb-3V-6Zr-O alloy plate by doubled sandblasting process using silicon carbide particles with 14.0 μm for average particle size as first process, then using the particles with 3.0 μm for average particle size as second process. Apatite Nuclei (AN) were precipitated in the pores. By these treatments, bioactive AN-precipitated Ti alloys were fabricated. Bioactivity of the AN-precipitated Ti alloys was examined by soaking in SBF and it was observed that hydroxyapatite was induced on the surface of the Ti alloys within 1 d. High adhesive strength of hydroxyapatite layer was achieved due to a mechanical interlocking effect between hydroxyapatite formed in the micropores and the plate.

Fabrication of Bioactive Apatite Nuclei Precipitated Ti-15Mo-5Zr-3Al Alloy by Using Doubled Sandblasting Process

2014 ◽  
Vol 631 ◽  
pp. 231-235 ◽  
Author(s):  
Takeshi Yabutsuka ◽  
Hiroshi Mizuno ◽  
Ryoki Karashima ◽  
Takeshi Yao
Keyword(s):  
Silicon Carbide ◽  
Particle Size ◽  
Adhesive Strength ◽  
Average Particle Size ◽  
Average Particle ◽  
Alloy Plate ◽  
Ti Alloys ◽  
Size Of Particles ◽  
Silicon Carbide Particles ◽  
Carbide Particles

Micropores were formed on the surface of Ti-15Mo-5Zr-3Al alloy plate by doubled sandblasting process using silicon carbide particles with 14.0 μm and/or 3.0 µm average particle size by changing the combination of the size of particles. Apatite Nucleus (AN) was precipitated in the pores. By these treatments, bioactive AN precipitated Ti alloys were fabricated. Bioactivity of the Ti alloys was examined by soaking in SBF. Formed hydroxyapatite showed highest adhesive strength in the case of sandblasting using 14.0 μm particles then using 3.0 μm particles.

Porous NiO-SDC Carbonates Composite Anode for LT-SOFC Applications Produced by Pressureless Sintering

2011 ◽  
Vol 52-54 ◽  
pp. 488-493 ◽  
Author(s):  
Raharjo Jarot ◽  
Andanastuti Muchtar ◽  
Wan Ramli Wan Daud ◽  
Norhamidi Muhamad ◽  
Edy Herianto Majlan
Keyword(s):  
Average Particle Size ◽  
Average Particle ◽  
Face Centered Cubic ◽  
X Ray Diffraction ◽  
Weight Percentage ◽  
Composite Anodes ◽  
Optimum Porosity ◽  
Face Centered ◽  
Two Phases ◽  
Cold Pressed

Composite anodes made of NiO and SDC-(Li/Na)2CO3 were investigated in relation to their structure, morphology, and porosity. As a first step, the anode powder was prepared by mixing the NiO with SDC-(Li/Na)2CO3 via solid state reaction in weight percentage of 60 : 40 wt% and in various compositions of carbonates (20 and 30wt%), namely NiO-SDC8020 and NiO-SDC7030, respectively. The powder mixtures were then calcined at 680oC. The resultant powder was fine with surface area of about 13.10-13.70 m2/g and an average particle size of 0.32-0.37µm. The powders consist of two phases i.e. the cubic NiO and face-centered cubic structure SDC-(Li/Na)2CO3 as confirmed with x-ray diffraction. The microstructures were observed under scanning electron microscopy (SEM). The anode pellets were later compacted at different pressures (27, 32 and 37 MPa) and sintered at 600oC. The optimum porosity (20.99-24.78%) was achieved for samples of NiO-SDC8020 and NiO-SDC7030 sintered at 600oC and cold pressed at 32 and 37 MPa.

Preparation and Properties of Magnesium-Aluminum Matrix Composites Reinforced with Silicon Carbon Particles

2012 ◽  
Vol 583 ◽  
pp. 3-8 ◽  
Author(s):  
Tan Wei Zhou ◽  
Xiang Rong Liu ◽  
Run Lan Zhang ◽  
Zhuang Zhuang Su
Keyword(s):  
Average Particle Size ◽  
Aluminum Matrix ◽  
Optical Microscope ◽  
Aluminum Matrix Composites ◽  
Al Alloy ◽  
Average Particle ◽  
Carbon Particles ◽  
Sic Particles ◽  
Silicon Carbon ◽  
The Matrix

Mg-5wt.%Al alloy based composites reinforced with 0wt.%, 1wt.%, 2wt.% silicon carbon (SiC) particles (average particle size about 3.5µm) were prepared under flux protection conditions. The microstructures, textures, components and hardness of the above composites were investigated through optical microscope, scanning electron microscope, X-ray diffraction and sclerometer. The results indicate that SiC particles are distributed along grain boundaries, limiting grain growth and conducing to the refinement of the matrix. The hardness of composites increases with the increase of SiC particles addition amount. The presences of Mg2Si and the binary carbide Al4C3 were observed in the composites. The Al4C3 phase has a crystal structure closer to that of Mg than to that of SiC, which can be act as a potential nucleant for Mg-5wt.%Al alloy.

Abrasion and erosion wear of electrodeposited nickel - silicon carbide nanocomposite coatings

2017 ◽  
Vol 48 (8) ◽  
pp. 785-791 ◽  
Author(s):  
V. Alar ◽  
I. Žmak ◽  
I. Stojanović ◽  
V. Šimunović ◽  
Z. Čeralinac
Keyword(s):  
Silicon Carbide ◽  
Nanocomposite Coatings ◽  
Erosion Wear ◽  
Electrodeposited Nickel ◽  
Nickel Silicon
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