The New Jersey Institute of Technology's
Electronic Theses & Dissertations Project

Title:	Study of surface properties produced by magneto-plasma on nitriding for improving wear resistance
Author:	Shih, I-Tsung
View Online:	njit-etd1993-045 (xviii, 177 pages ~ 9.0 MB pdf)
Department:	Department of Mechanical Engineering
Degree:	Doctor of Philosophy
Program:	Mechanical Engineering
Document Type:	Dissertation
Advisory Committee:	Dubrovsky, Roman (Committee chair) Chen, Rong-Yaw (Committee member) Droughton, John Vincent (Committee member) Levy, Nouri (Committee member) Suchow, Lawrence (Committee member)
Date:	1993-01
Keywords:	Nitriding. Plasma-enhanced chemical vapor deposition. Surface hardening. Coating processes. Microstructure. Mechanical wear.
Availability:	Unrestricted
Abstract:	In this work a newly developed surface treatment process, Magneto-Plasma Ion Nitriding process, was developed and studied. This process was developed to increase durability and wear resistance of operational surfaces of different machine components. In this study, orthogonal experimental analysis was used to develop, optimize, and select the process parameters. Coating layers were characterized and studied by using scanning electron microscopy(SEM), Auger electron spectroscopy(AES), and image analysis system. The influence of different process treatment parameters, such as temperature, nitrogen concentration, and magnetization, on the layers properties was studied. The mechanism of layer formation and bonding was proposed and a mathematical model was derived. To perform the wear resistance test, the wear testing methodology and a computer-controlled wear testing machine were designed, manufactured, and assembled. Selected process parameters permitted developing different types of compound layers, such as ε , γ1, α phases, or their combination. Microstructure and microhardness investigations were performed with respect to deposited layers. Differently applied magnetic treatments to the surface provided improvement in diffusion bonding of deposited compound layers to substrate. The mechanism of this bonding was introduced and explained in this work. As a result of the developed magneto-plasma ion nitriding surface treating process, it was found that durability and wear resistance of operational surfaces of machine components made from different steels have been significantly improved.