Masters Theses

Keywords and Phrases

Additive manufacturing; Ceramic; Direct Ink Write; Material Extrusion; Robocasting; Silicon Nitride


“Ceramic On-Demand Extrusion (CODE) is a patented solid freeform fabrication method for manufacturing high-density monolithic ceramic parts. In the past 5-6 years, the technology has been successfully implemented to fabricate alumina and zirconia parts. The mechanical characterizations also show CODE’s high potential in achieving desired structural properties. The present study covers the fabrication of silicon nitride parts by CODE process, which entailed the design of paste formulation for achieving rheology suitable for dimensional control in fabricated parts and determining firing temperature and the content of sintering additives for silicon nitride green bodies fabricated by CODE. The density, hardness, and fracture toughness measurements showed comparable properties achieved against other additive manufacturing processes. The microstructure and XRD data confirmed the full densification achieved in the sintered samples. Demonstration samples with and without support material were successfully fabricated by the CODE process. During the research, the user guidelines for the CODE process and process control model were described for better transfer of technology and identifying areas needing further exploration for achieving process excellence”--Abstract, page iv.


Leu, M. C. (Ming-Chuan)

Committee Member(s)

Hilmas, Greg
Watts, Jeremy Lee, 1980-
Bayless, David J.


Mechanical and Aerospace Engineering

Degree Name

M.S. in Mechanical Engineering


Missouri University of Science and Technology

Publication Date

Fall 2021

Journal article titles appearing in thesis/dissertation

Fabrication of highly dense silicon nitride parts by ceramic on-demand extrusion process and pressureless sintering


xi, 46 pages

Note about bibliography

Includes bibliographic references.


© 2021 Sachin Choudhary, All rights reserved.

Document Type

Thesis - Open Access

File Type




Thesis Number

T 11940

Included in

Manufacturing Commons