msepostdoc-list Final Exam Seminar, Tuesday, November 30, at 11:30 AM

[Morgan, Yuan-Yu Karen]

Please consider attending this seminar:

MATERIALS ENGINEERING
SEMINAR

"The Influence of Print Layer Orientation on the Mechanical Properties of SiC and Cf/SiC CMCs Formed via Direct Ink Writing"
By
Kyle Cox
                                                                                                                                                                                  Purdue MSE M.S. Final Exam

Advisors: Professor Rodney Trice and Professor Jeff Youngblood

ABSTRACT

Silicon carbide is a useful monolithic and matrix ceramic due to its excellent mechanical properties and corrosion/oxidation resistance at high temperature. This makes it an attractive material for use in advanced applications, such as aircraft engines and high-speed flight. In this study, additively manufactured monolithic SiC and Cf/SiC CMCs, processed via direct ink writing (DIW) of a 53 vol% colloidal suspension, achieved >96% theoretical density through pressureless sintering. When present, fibers are aligned in the direction of the print path. Five different print paths were studied, including a 0o path, 90o path, 0/90o path, 0/15/30/45/60/75/90o path, and 0/30/60/90/60/30/0o path. Four-point bend testing was performed to determine flexural strength and Weibull analysis was performed. Strengths were highest for the 0o print path. The characteristic strength, σo, of this print path was 375 MPa with a Weibull modulus of 7.4 for monolithic SiC and a σo of 361 MPa with a Weibull modulus of 10.7 for Cf/SiC. Weibull modulus was greater for Cf/SiC samples compared to identically printed monolithic SiC samples. SEM and optical microscopy were used to analyze printed parts which showed a high degree of fiber alignment in the direction of the print. Fiber pullout was observed on the fracture surface, as well as intragranular fracture.







Date: Tuesday, November 30, 2021

Time: 11:30 A.M.
Place: by Webex https://purdue.webex.com/meet/rtrice



Yuan-Yu Karen Morgan,Ph.D.
Academic Advisor-Graduate Program
School of Materials Engineering
Neil Armstrong Hall of Engineering, Room 2217
765-494-4103
ymorgan at purdue.edu<mailto:ymorgan at purdue.edu>

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