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Fabrication and Microstructual Study of Ti/TiC Composite Coating on CP-Ti by Using Various Cored Wires and TIG

Monfared, Amir | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 41402 (07)
  4. University: Sharif University of Technology
  5. Department: Materials and Sceince Engineering
  6. Advisor(s): Kokabi, Amir Hossein; Asgari, Sirous
  7. Abstract:
  8. Tungsten Inert Gas (TIG) process and different cored wires that were filled separately with nano TiC particles, micro TiC particles and graphite powders were employed to produce surface composite coating on CP-Ti substrate to improve wear resistance. At first using titanium strips, wire drawing process and different powders various cored wires were produced and then using TIG, these cored wires were coated on CP-Ti. This process was done for different current intensities and velocities. Composite coating tracks were found to be affected by the TIG heat input and the kinds of the cored wires. The microstructures of the surface composite coating showed phases of α'-Ti and primary and dendritic TiC particles using the results of optical and scanning electron microscopy and X-ray diffractometry. Also greater volume fraction of TiC particles in the coating was found at lower heat input. A maximum micro hardness value of 1200 HV was found in the surface composite coating, which is 8 times greater than the substrate material (150 HV). Pin-on-disk wear tests exhibited the better performance of the surface composite coating than the untreated material which is attributed to the presence of TiC particles in the microstructure
  9. Keywords:
  10. Wear Resistance ; Titanium ; Cored Wire ; Tungsten Inert Gas (TIG)Welding ; Composite Coating ; Titanium Carbide

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