Dissertation > Excellent graduate degree dissertation topics show

Effect of Ti Content on Tribological and Thermal Impact Properties of CrTiAlN Coatings by Magnetron Sputtering

Author: ZuoKe
Tutor: JiangBaiLing；BaiLiJing
School: Xi'an University of Technology
Course: Materials Science and Engineering
Keywords: CrTiAlN coating phase microstructure tribological property thermal impact property
CLC: TG174.4
Type: Master's thesis
Year: 2009
Downloads: 13
Quote: 0
Read: Download Dissertation

Abstract


CrTiAIN coatings with different Ti content were deposited on high speed steel and silicon wafers substrates by changing Ti target current in magnetron sputtering system. The chemical composition, phases and microstructures of the coatings were analyzed by EDS, XRD, SEM and TEM. The basic mechanical properties such as hardness, toughness, adhesion strength and impact properties of the coatings were tested. Friction and wear behavior of the coatings were studied by WMM-2 wear tester and optical microscope. The thermal impact properties of the coatings were evaluated using box electrical resistance furnace at different temperature. Then Mechanisms which Ti content effect on tribological adaptability and thermal impact properties of the coatings were discussed through combining with the chemical composition, phases, microstructures and basic mechanical properties of the coatings.The results indicate:With the increase of Ti content, the (Cr,Ti,Al)N system gradually substitutes for CrN and becomes mainly phases of the coatings, besides it appears a small quantity of TiN phase in the coatings, the surface morphology of the coatings gradually changes from triangular pyramid structure to cellular structure. Coating with 5.13at% Ti content shows the best mechanical properties. Friction and wear at room temperature, with the increase of Ti content, the friction coefficients with 45 steel take from 0.5 to 0.37, wear rates of the coatings also decrease, and the wear mechanism undergoes a adhesive wear→abrasive wear transformation. Heat friction and wear, with the increase of Ti content, the friction coefficients decrease. Wear rate of the coating with 0% Ti content is largest, the coating with the most Ti content show larger than wear rate of the other coatings. Adhesive wear, abrasive wear and oxidation wear are three most factor that is effect on the heat wear mechanism, and with the increase of Ti content, oxidation wear become dominant in three kinds wear mechanism. With the increase of Ti content, CrTiAIN coatings have different thermal impact properties. As for coating with high Ti content, TiO2 that is loosen structure was easily formed when happen thermal impact, it offer the chance of further oxidation for coatings and reduce thermal impact property of the coatings. Finally, the coatings with high Ti content have the worse thermal impact property.

Related Dissertations

  1. Research on Physical Properties and Data Processing in the Process of Removing Acid of LNG,TE644
  2. Reactive Hot-Pressing and Mechanical Properties of （ZrB2-ZrO2）/BN Composites,TB332
  3. Microstructure and Mechanical Properties of Mg-Zn-Y-Zr Alloys,TG146.22
  4. Investigation on Microstructure and Properties of Cadmium-Free Silver-Based Intermediate Temperature Filler Metals,TG425.2
  5. Research on Technology and Mechanism of Joining Cemented Carbide to Carbon Steel,TG454
  6. Research on the Integrated Grating Subdividing Digital Display Device Based on DSP,TH822
  7. Signal Detection Circuit Design for Slow-Light Optic Fiber Gyroscope,V241.5
  8. Influence of Inclined Secondary Air on Gas-Solid Flows in a W-Shaped Flame Boiler,TK229
  9. Study of Effect of High Temperature Seperator on Hydrodynamices in CFB Boiler Furance,TK229.66
  10. Study on Gas-Solid Two-Phase Flow in Spouted Beds,TK173
  11. Study on Drive and Control System of Five-Phase PMSM Based on FPGA,TM341
  12. Design of Servo Control System with Linear Motor Based on Digital Filter Technology,TM359.4
  13. Grid-Side Converter Control and Wind Turbine Emulator in Direct Drive Wind Power System,TM46
  14. Research of Wavefront Transformation Based on Liquid Crystal Spatial Light Modulator,TN761
  15. Research on Ionosphere Contamination of High Frequency Radar Echoes and Time-Frequency Analysis Technology,TN958.93
  16. Research on Signal Receiving System of Phase Laser Range Finder,TN249
  17. Study of Target Simulation and Signal Processing Algorithm for Skywave Over-The-Horizon Radar,TN958.93
  18. LF thermal state slag recycling desulfurization behavior of the process,X757
  19. Study on the Recycling of Post-Consumer Polyester Textiles,X791
  20. The Research of the Expression Level of Hexokinasel1 in the Chronic Phase and Blastic Phase of Patients with Chronic Myeloid Leukemia,R733.7
  21. Fabricationand Properties of SiC-AlN Multiphase Ceramics Prepared by Gelcasting,TQ174.62

CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metal corrosion protection,metal surface treatment > Corrosion control and protection > Metal surface protection technology
© 2012 www.DissertationTopic.Net  Mobile