Dissertation > Excellent graduate degree dissertation topics show

Preparation and Properties of Ni-based CNT Composite Coatings

Author: ZhouQuan
Tutor: SunWanChang
School: Xi'an University of Science and Technology
Course: Materials Science
Keywords: Carbon nanotubes Composite Coatings Surfactant Tribological properties
CLC: TB383.1
Type: Master's thesis
Year: 2011
Downloads: 96
Quote: 0
Read: Download Dissertation

Abstract


As the development of technology, people have increased their demand in the wear resistance of materials. As a new carbon material, carbon nanotubes have excellent mechanical properties and special tubular structure, therefore those wear-resistant and antifriction composite materials which use CNT as a reinforce body have became the hot spot in the present studies. In this paper, CNT was used as strengthen phase and Ni-based CNT composite coatings were prepared by using electroless deposition and electro-deposition, the properties of the composite coatings were also studied.The carbon nanotubes were pretreated by immersing in a 1:1 mixture of H2SO4 and HNO3. The results show that the carbon nanotubes have been purified, shortened and actived after the treatment, and its suspension in water have also been improved. By studying the effect of surfactants on the dispersion stability of CNT and the properties of Ni-based CNT composite coatings, we find that adding appropriate amount of anionic surfactant SDS can significantly improve the dispersion of CNT in the plating bath, and the resulting composite coatings have a more excellent performance.The morphology of Ni-based CNT composite coatings were observed by using SEM. It can be found that the carbon nanotubes are uniformly distributed in the Ni matrix, the surfaces of the coatings are smooth and the composite coatings have good adhesion to the substrate. The structure of the composite coatings before and after heat treatment was analyzed by XRD. It is seen that Ni-P-CNT electroless composite coating presents a crystallization transformation during heat treatment. At the same time, because of the appearance of Ni3P and other crystalline phase, the hardness and wear resistance of the composite coatings are greatly improved. On the contrary, the corrosion resistance of the coatings is decreased. The annealed Ni/CNT composite coatings still presents a crystal structure which indicates that heat treatment have little effect on its performance.By adding carbon nanotubes into the plating bath, we can find that as the increase of CNT concentration in the bath, CNT content in the coatings and the properties of the coatings are also increased. At the same time, the increase of CNT concentration can improve the plating rate, but lead to an increase to the roughness of the composite coatings. As the CNT concentration in the plating bath exceeds a certain level, the agglomerations of carbon nanotubes become more serious, and the performance of the composite coatings tends to be reduced.The tribological properties of several different coatings were studied. The results show that as the co-deposited of carbon nanotubes, the wear rate and friction coefficient of the composite coatings are significantly decreased, and the wear marks are more smooth .All these indicates that carbon nanotubes play a good anti-friction and self-lubrication function in the wear process, and the addition of carbon nanotubes can greatly improved the tribological properties of the composite coatings.

Related Dissertations

  1. Preparation and Tribological Properties of TZ3Y20A-SrSO4 Ceramic Matrix Composites,TB332
  2. Carbon Nanotubes Compound Polymer Film Modified Electrode and Its Application for Electroanalytical Chemistry,O657.1
  3. SnO 2 / CNTs composite Controllable Preparation and Gas Sensitivity Study,TB383.1
  4. MWCNTs and ZnO / SnO 2 Composites and NO gas research,TB33
  5. Construction of Protic Ionic Liquid Modified Electrode and Its Enhanced Action in Direct Electron Transfer of GOD,O646
  6. Prepration of Manganses Dioxide and Investigation on the Performance of Supercapacitor,TM53
  7. Synthesis of Platinum-based Composite Catalysts and Their Electrocatalytic Properties for Methanol Oxidation,TM911.4
  8. Fabrication and Characterization of Nano-ZnO by PLA in Liquid Solution,TB383.1
  9. Process Properties of Hemoglobin Modified Electrode Degradating Trichloroacetic Acid,X703
  10. Molecular Conformation and Orientation and Adsorption Kinetics Models of Phospholipid at the Air/Water Interface,O647.31
  11. Determination of Organic Acids in Industrial Productions and Application of Carbon Nanotube in Chromatography Analysis,O657.75
  12. Preparation, Characterization of Oil-soluble Nano Graphite Lubricant Additives and the Tribological Property,TB383.1
  13. Preparation and Application of Three Dimensional Reinforcements with Carbon Nanotubes Grown on the Fiber Surfaces in Situ,TB383.1
  14. Study on the Preparation and Characterization for the CNT Laminated Film Based on PAN Precursors,TB383.2
  15. Synthesis of Silver Nanoparticles on Modified Multi-walled Carbon Nanotubes and Their Antimicrobial Effects,TB383.1
  16. Electrostantic Assembled Glass Fiber/Multiwall Carbon Nanotubes Hybrids Reinforced Polymer Composites,TB383.1
  17. Synthesis of Carbon Nanotubes/ Titanium Dioxide Composite Photocatalyst by Fluidized Bed Chemical Vapor Deposition (FBCVD) and Its Photocatalytic Properties,TB383.1
  18. The Construction and the Vitro Photodynamic Effects Evaluation of Chitosan-chlorin E6-single Wall Carbon Nanotubes Drug Delivery System,TQ460.1
  19. Nanotube modified carbon fiber reinforced composite material structure of the capacitor,TB33
  20. Nitrogen-doped SO 4 2 - / TiO 2 photocatalyst precipitation step Preparation and Photocatalytic Performance,O643.36
  21. High thermal conductivity epoxy composites and Research,TB332

CLC: > Industrial Technology > General industrial technology > Materials science and engineering > Special structural materials
© 2012 www.DissertationTopic.Net  Mobile