Dissertation > Excellent graduate degree dissertation topics show

Influence of Vacuum Annealing Treatment on Microstructure and Properties of the Chromium-Doped Graphite-Like-Carbon Coatings

Author: ZhangBin
Tutor: ShiHuiYing
School: Xi'an University of Technology
Course: Materials Science and Engineering
Keywords: Graphite-like carbon coatings vacuum annealing coating-substrate binding strength microstructure
CLC: TG156.2
Type: Master's thesis
Year: 2009
Downloads: 43
Quote: 1
Read: Download Dissertation

Abstract


Chromium-doped Graphite-like carbon (GLC) films with different Cr content were deposited by closed field unbalanced magnetron sputter iron plating technique in this paper. The films were annealed in the vacuum environment. The performance and microstructure of samples were analysed before and after annealed by the instruments such as XPS, SEM, TEM, XRD, micro-hardness tester, scratcher tester, Pin-on-disc tester and so on. The effect of temperature and Cr content on mechanical and tribological performance of GLC films were also researched in this paper.The results show that the annealing temperature can influence the C bond structure of working layer. The SP2C content increases with rising annealing temperature. It indicates the coating had been translating into graphite state from amorphous carbon with the annealing temperature increase. The annealed in vacuum environment influences the crystal structure of coating. The crystal structure is amorphous state mainly under low temperature. When the temperature is 500℃, it translated into crystal phase such as Cr3C2 from XRD spectrum. The Cr3C2 diffraction intensity enhanced and the crystal phase of Cr23C6 appeared in the same time at 600℃. When the annealing temperature reached 800℃, the main structure of the coating was Cr3C2, Cr23C6 and little CrSi2 phases.The coating hardness increased and later decreased with the rising temperature. It’s the largest microhardness of coating when the temperature is 500℃. The coating hardness was consistent on the whole when Cr target current was 0A and 0.1 A; The adhesion strength of coating-substrate reduced with the annealing temperature increase, but the adhesion strength reduced trend is slow when it’s 0A; When the Cr target current was 0A and 0.1 A, the friction coefficient of coating was first decreased and then increased with the rising temperature, and the coating specific wear rate was increased gradually with the rising temperature; That Cr target current was 0.1 A the friction coefficient curve was stabler than it’s 0A and trend was slowly.

Related Dissertations

  1. Reactive Hot-Pressing and Mechanical Properties of （ZrB2-ZrO2）/BN Composites,TB332
  2. Microstructure and Mechanical Properties of Mg-Zn-Y-Zr Alloys,TG146.22
  3. Investigation on Microstructure and Properties of Cadmium-Free Silver-Based Intermediate Temperature Filler Metals,TG425.2
  4. Research on Technology and Mechanism of Joining Cemented Carbide to Carbon Steel,TG454
  5. The Investigations on the Characteristics and Mechanism of NIR Emission from Bi-doped Silicophosphate Glasses,TQ171.1
  6. Preliminary Study on Salt-Tolerant Mechanism of the New Pennisetum Purpereum Schumach Variety-Sumu No.2,S543.9
  7. Study on the Fine Structure of Intestine and Intestinal Mucosal Barrier in Zebrfish (Brachydanio Rerio),Q95-33
  8. Study on Characteristics of Morphology Anatomy and Physio-Biochemistry of Two Ecotype Varieties Cucumber Leggy Seedilings,S642.2
  9. Study on the Mechanism of Heat-Induced Gelation of Myofibrillar Proteins,TS251.1
  10. Studies on the Aggregation and Microstructure of Imidazolium Ionic Liquids in Solutions,O645.1
  11. Studies of Luminescence Characteristics of Eu3+-doped Rare Earth Borates REBaB9O16 （RE=rare Earth Ions and Y）,O627.3
  12. The Research on Extrusion Parameters Through the Plate Billet of Magnesium Alloy,TG379
  13. Study on Microstructure and Superconducting Properties of MgB2 Wires Fabricated by Two-Step PIT,TM26
  14. Study on Morphological Evolution and Toughening Mechanism of Sandbag Microstructure-toughened PA6/EPDM-M/nano-CaCO3 Ternary Composites,TB33
  15. The Photoluminescence of H1.77 [Sr0.8 Bi0.21Ta2 O7] Nano-layers Annealing under Different Temperatures and the Effect of the Cu2O Addition on Its Photocatalytic Activity,O482.31
  16. Study on Influence of Preferred Orientation on Mechanical and Recoverable Properties of TN479 Shape Memory Alloy Sheet,TG139.6
  17. Study on DC Casting of Aluminum Alloy under the Dual-frequency Electromagnetic Fields,TG292
  18. Low-Frequency Magnetic Pulsing Effect as Well as EET Study of Amorphous Alloy Fe43Co43Hf7B6Cu1,TG139.8
  19. Study on Electromagnetic Roll-Casting and Succeed Rolling of AZ61 Magnesium Alloy,TG339
  20. Study on Microstructure and Performance of Laser Cladding Ni-Based Amorphous Alloy Coatings,TG174.4
  21. The Preparation, Microstructure and Propertities of the New Type 3D-Meshy SiC/Cu-Fe Composite Material,TB33

CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Heat treatment > Heat treatment process > Annealing
© 2012 www.DissertationTopic.Net  Mobile