Effect of carbon nanotubes on microhardness and adhesion strength of high-velocity oxy-fuel sprayed NiCr–Cr3C2 coatings

2021 ◽  
pp. 146442072110409
Author(s):  
Manjunatha Kuruba ◽  
Giridhara Gaikwad ◽  
Jegadeeswaran Natarajan ◽  
Praveennath G Koppad
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Composite Coating ◽  
Adhesion Strength ◽  
High Velocity ◽  
Steel Tube ◽  
Phase Identification ◽  
Mixed Powder ◽  
Coating Surface ◽  
Carbon Nanotube Composite

NiCr–Cr3C2 coatings are widely used for high temperature and tribological applications due to their high hardness, oxidation, and wear resistance properties. In the present investigation, an attempt is made to further enhance the hardness and adhesion strength of NiCr–Cr3C2 coatings by reinforcing them with multi-walled carbon nanotubes. The carbon nanotubes (3–7 wt%) with varying weight percentages were mixed with NiCr–Cr3C2 using a planetary ball rolling mill and sprayed on SA213 T12 (T12 alloy steel tube) using a high-velocity oxy-fuel spraying process. The microstructures of mixed powder, coating cross-section, and fractured coating surface were characterized using a scanning electron microscope while X-ray diffraction was used for phase identification in the fractured coating surface. The coated samples were subjected to microhardness and adhesion strength tests according to ASTM E384 and ASTM D4541-09 standards. Out of all coatings, NiCr–Cr3C2/7% carbon nanotube composite coating showed the lowest porosity of 1.17%, highest microhardness, and adhesion strength of 563.8 HV and 55.8 MPa, respectively. A fracture analysis after a pull-off adhesion test revealed adhesion failure for NiCr–Cr3C2 coating and combined adhesion/cohesion failure for NiCr–Cr3C2/7% carbon nanotube composite coating.

Mechanical Properties Of Polyaniline / Multi-walled Carbon Nanotube Composite Films

2003 ◽  
Vol 791 ◽  
Author(s):  
P. C. Ramamurthy ◽  
W. R. Harrell ◽  
R. V. Gregory ◽  
B. Sadanadan ◽  
A. M. Rao
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Composite Films ◽  
Weight Percent ◽  
Organic Electronic Devices ◽  
Multiwalled Carbon ◽  
Multi Walled Carbon Nanotube ◽  
Contact Devices ◽  
Carbon Nanotube Composite

ABSTRACTHigh molecular weight polyaniline / multi-walled carbon nanotube composite films were fabricated using solution processing. Composite films with various weight percentages of multiwalled carbon nanotubes were fabricated. Physical properties of these composites were analyzed by thermogravimetric analysis, tensile testing, and scanning electron microscopy. These results indicate that the addition of multiwalled nanotubes to polyaniline significantly enhances the mechanical properties of the films. In addition, metal–semiconductor (composite) (MS) contact devices were fabricated, and it was observed that the current level in the films increased with increasing multiwalled nanotube content. Furthermore, it was observed that polyaniline containing one weight percent of carbon nanotubes appears to be the most promising composition for applications in organic electronic devices.

Fabrication of Graphene/Carbon Nanotube Composite Modified Electrode for Selective and Sensitive Determination of Uric Acid

2013 ◽  
Vol 641-642 ◽  
pp. 562-565
Author(s):  
Zheng Xiao Liu ◽  
Jian Fei Xia ◽  
Zong Hua Wang ◽  
Yan Zhi Xia ◽  
Fei Fei Zhang ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Uric Acid ◽  
Carbon Nanotube ◽  
Modified Electrode ◽  
Phosphate Buffer Solution ◽  
Carbon Electrode ◽  
Buffer Solution ◽  
Sensitive Determination ◽  
Carbon Nanotube Composite

A novel composite was firstly synthesized by compositing graphenes (G) and carbon nanotubes (CNTs) and then a new composite modified electrode (G/CNTs/GCE) was prepared by coating the resulting composite on the surface of the glassy carbon electrode (GCE). The composite modified electrode G/CNTs/GCE showed great electrochemical activities which were studied by sensitive determining the electrochemistry behaviors of uric acid (UA). It revealed when the concentration range of UA changed from 1×10-7 mol/L to 1×10-3 mol/L, the peak currents had linear relationship with the concentration of UA in the phosphate buffer solution (PBS) which the value of pH is 7.0. And the linear equation is ip (μA) = 21.55C+28.94 (C: mmol/L), with the related coefficient 0.9964.

Research on Ni-P-Carbon-Nanotube Electro-Brush Plating Composite Coating Technology

2014 ◽  
Vol 940 ◽  
pp. 24-27
Author(s):  
Yu Feng Zhang ◽  
Jian Cheng Wang ◽  
Xue Bing Liao ◽  
Jie Lei
Keyword(s):  
Composite Material ◽  
Carbon Nanotube ◽  
Bond Strength ◽  
Composite Coating ◽  
Ph Value ◽  
Coating Technology ◽  
Composite Plating ◽  
Plating Solution ◽  
Carbon Nanotube Composite ◽  
Brush Plating

A film of Ni-P-Carbon-nanotube composite material is deposited on the surface of the metal substances by electro-brush plating. In this process, the composition of the Ni-P-Carbon-nanotube composite plating solution, the pretreatment on the carbon-nanotube and the effects on quality by the different brush plating technology conditions are investigated. The results shows that carbon-nanotube particles can be distributed uniformly in the coating by oxidizing, sensitizing and activating while the temperature of the plating solution should be controlled at 55°C, and PH value, 1.5~2.5. After the carbon-nanotube is added, the coating defects, such as the crack, the desquamation and the low bond strength, can be prevent effectively.

Functionalization effect on a Pt/carbon nanotube composite catalyst: a first-principles study

2016 ◽  
Vol 18 (32) ◽  
pp. 22687-22692 ◽  
Author(s):  
Byung-Hyun Kim ◽  
Kwang-Ryeol Lee ◽  
Yong-Chae Chung ◽  
Mina Park
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Functional Groups ◽  
First Principles ◽  
Atomic Oxygen ◽  
Composite Catalyst ◽  
Atomic Nitrogen ◽  
First Principles Calculations ◽  
Surface Functional Groups ◽  
Carbon Nanotube Composite

Chemical interactions between Pt and both pristine and defective carbon nanotubes (CNTs) that were functionalized with various surface functional groups, including atomic oxygen (–O), atomic nitrogen (–N), hydroxyl (–OH) and amine (–NH2) groups, were investigated through first-principles calculations.

Facile fabrication of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate)-coated selenium nanowire/carbon nanotube composite films for flexible thermoelectric applications

2021 ◽  
Author(s):  
Dabin Park ◽  
Minsu Kim ◽  
Jooheon Kim
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Composite Film ◽  
Composite Films ◽  
Multi Walled Carbon Nanotubes ◽  
Facile Fabrication ◽  
Selenium Nanowires ◽  
Carbon Nanotube Composite ◽  
Flexible Thermoelectric ◽  
Walled Carbon Nanotubes

In this study, we synthesized a flexible thermoelectric composite film consisting of poly(3,4-ethylenedioxythiopene)-poly(4-styrenesulfonate)-coated selenium nanowires (PEDOT:PSS-coated Se NWs) and multi-walled carbon nanotubes (MWCNT) via simple solution mixing. The PEDOT:PSS-coated Se...

Freestanding CoSeO3·H2O nanoribbon/carbon nanotube composite paper for 2.4 V high-voltage, flexible, solid-state supercapacitors

Nanoscale ◽  
2018 ◽  
Vol 10 (25) ◽  
pp. 12003-12010 ◽  
Author(s):  
Yingchang Jiang ◽  
Zeyi Wu ◽  
Le Jiang ◽  
Zhichang Pan ◽  
Peiyu Yang ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Solid State ◽  
Energy Density ◽  
High Voltage ◽  
High Energy ◽  
High Energy Density ◽  
Carbon Nanotube Composite ◽  
Composite Paper

Freestanding paper consisting of ultrathin CoSeO3·H2O nanoribbons and carbon nanotubes fabricated by a vacuum-assisted filtration strategy exhibits 2.4 V high-voltage, high energy density and excellent flexibility for solid-state supercapacitors.

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