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METALLIC PART FABRICATION WITH SELECTIVE INHIBITION SINTERING (SIS) BASED ON MICROSCOPIC MECHANICAL INHIBITION
by
Mahdi Yoozbashizadeh
A Dissertation Presented to the
FACULTY OF THE USC GRADUATE SCHOOL
UNIVERSITY OF SOUTHERN CALIFORNIA
In Partial Fulfillment of the
Requirements for the Degree
DOCTOR OF PHILOSOPHY
(Industrial and Systems Engineering)
December 2012
Object Description
| Title | Metallic part fabrication wiht selective inhibition sintering (SIS) based on microscopic mechanical inhibition |
| Author | Yoozbashizadeh, Mahdi |
| Author email | yoozbash@usc.edu;yoozbash@usc.edu |
| Degree | Doctor of Philosophy |
| Document type | Dissertation |
| Degree program | Industrial and Systems Engineering |
| School | Viterbi School of Engineering |
| Date defended/completed | 2012-08-14 |
| Date submitted | 2012-12-05 |
| Date approved | 2012-12-05 |
| Restricted until | 2012-12-05 |
| Date published | 2012-12-05 |
| Advisor (committee chair) | Khoshnevis, Behrokh |
| Advisor (committee member) |
Chen, Yong Udwadia, Firdaus |
| Abstract | The Selective Inhibition Sintering (SIS) process is an additive manufacturing (AM) technology which builds parts on a layer-by-layer basis. The principle idea of the SIS process is based on the prevention of selected segments of each powder layer from sintering. The purpose of this research is to investigate the fundamentals of the Selective Inhibition Sintering (SIS) process for the fabrication of metallic parts. A SIS-Metal process has been developed based on the microscopic mechanical inhibition principle. In this process the inhibitor, which is a salt solution or a carbohydrate solution (sucrose), is printed in the selected areas of each metal powder layer; the salt re-crystallizes when water evaporates under moderate heat; salt crystals decompose to second phase metal oxide during the sintering cycle; the decomposed solid particles cover the surface of affected metal powder particles and exert a retarding force on the surface movement and prevent the sintering. This thesis presents the results of the conducted research on the inhibition mechanism and control of the SIS process. Experimental results are also presented to demonstrate the capability of the process in fabricating metallic parts with various geometries. The SIS-Metal process has numerous advantages including low cost, minimal shrinkage and deformation effects and independence from polymeric binders which cause shrinkage and adverse effect on sintering furnace. The factors affecting the SIS-Metal process based on microscopic mechanical inhibition are investigated. By the aid of response surface methodology the effective factors are evaluated to improve the part strength, surface quality and dimensional accuracy of the parts made with the SIS-Metal process. |
| Keyword | inhibition from sintering; metallic part fabrication; powder metallurgy; powder sintering; rapid prototyping; additive manufacturing |
| Language | English |
| Part of collection | University of Southern California dissertations and theses |
| Publisher (of the original version) | University of Southern California |
| Place of publication (of the original version) | Los Angeles, California |
| Publisher (of the digital version) | University of Southern California. Libraries |
| Provenance | Electronically uploaded by the author |
| Type | texts |
| Legacy record ID | usctheses-m |
| Rights | Yoozbashizadeh, Mahdi |
| Access conditions | The author retains rights to his/her dissertation, thesis or other graduate work according to U.S. copyright law. Electronic access is being provided by the USC Libraries in agreement with the author, as the original true and official version of the work, but does not grant the reader permission to use the work if the desired use is covered by copyright. It is the author, as rights holder, who must provide use permission if such use is covered by copyright. The original signature page accompanying the original submission of the work to the USC Libraries is retained by the USC Libraries and a copy of it may be obtained by authorized requesters contacting the repository e-mail address given. |
| Repository name | University of Southern California Digital Library |
| Repository address | USC Digital Library, University of Southern California, University Park Campus MC 7002, 106 University Village, Los Angeles, California 90089-7002, USA |
| Repository email | cisadmin@usc.edu |
| Archival file | uscthesesreloadpub_Volume6/etd-Yoozbashiz-1381.pdf |
Description
| Title | Page 1 |
| Full text | METALLIC PART FABRICATION WITH SELECTIVE INHIBITION SINTERING (SIS) BASED ON MICROSCOPIC MECHANICAL INHIBITION by Mahdi Yoozbashizadeh A Dissertation Presented to the FACULTY OF THE USC GRADUATE SCHOOL UNIVERSITY OF SOUTHERN CALIFORNIA In Partial Fulfillment of the Requirements for the Degree DOCTOR OF PHILOSOPHY (Industrial and Systems Engineering) December 2012 |
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