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URN etd-0126105-194755 Statistics This thesis had been viewed 5168 times. Download 1904 times. Author Chen-Yi Wei Author's Email Address email@example.com Department Materials Engineering Year 2004 Semester 1 Degree Ph.D. Type of Document Doctoral Dissertation Language English Page Count 97 Title Wear Resistance Improvement of AISI D2 Tool Steel by Post Treatment of Plasma Nitriding on Chromium Carbide Coating Prepared by TRD Keyword Thermoreactive diffusion Chromium carbide Chromium Nitride Fluidized bed technique Plasma nitriding Thermoreactive deposition Thermoreactive deposition Plasma nitriding Fluidized bed technique Chromium Nitride Chromium carbide Thermoreactive diffusion Abstract A modified TRD (Thermoreactive Deposition / Diffusion) has been investigated in a low pressure fluidized bed furnace in this study. The steel specimens AISI D2 were positioned above the surface of the alloying powder. The activator was periodically introduced into the alloying powder to provide the working atmosphere for the required process. Since the pressure of the retort was maintained between 6.7×102 Pa and 5.3×104 Pa, the consumption of fluidized gas (argon) was reduced significantly. A modified TRD also significantly increased the working space of the treating zone. Furthermore, the kinetics of reaction K = K0 exp(-Q/RT) was empirically determined in this study. It is shown that the activator, NH4Cl, can effectively lower the activation energy Q, as well as enhance the formation rate of the carbide layer.
The chromium nitride obtained from TRD followed by plasma nitriding (dual treatment) provides more resistant than that of the solely TRD treated one.
Advisor Committee F.-S. Chen - advisor
C.-H. Hsu - co-chair
Chen-Hsien Hwang - co-chair
Lee-Der Liu - co-chair
Liu-Ho Chiu - co-chair
Pee-Yew Lee - co-chair
Y.-C. Chen - co-chair
Files Date of Defense 2004-12-27 Date of Submission 2005-01-26