From: Msegradstudent-list <msegradstudent-list-bounces@ecn.purdue.edu> On Behalf Of Morgan, Yuan-Yu Karen Sent: Wednesday, November 17, 2021 11:21 AM To: msegradstudent-list@ecn.purdue.edu; msefaculty-list@ecn.purdue.edu; msepostdoc-list@ecn.purdue.edu Cc: Ku Blanco, Aury Y <akublanc@purdue.edu> Subject: [msegradstudent-list] Preliminary Exam Seminar Wednesday, December 1, 8 AM Please consider attending this seminar: MATERIALS ENGINEERING SEMINAR “Radiative Properties of Ultra-High Temperature Ceramics: ZrB2-SiC” By Abdullah Saad Purdue MSE Preliminary Exam Advisor: Professor Rodney Trice and Professor Carlos Martinez ABSTRACT Developing vehicles that can fly at a speed more than Mach 5 is essential for next-generation hypersonic aircraft. During hypersonic flight, a significant amount of energy is transferred to the vehicle leading edge, heating it to a temperature greater than 1800℃. It is necessary to reduce this high surface temperature of leading edges and this reduction in temperature can be achieved by radiating heat away from the surface. The relevant material property is emissivity, with a value approaching one desired. To protect the leading edge of hypersonic vehicle from extreme heating, it is important to find a class of materials that can withstand high temperatures and have enhanced radiative property. Ceramics are suitable for high-temperature applications since they usually melt at higher temperatures than metals and alloys. The potential class of materials to be used in extreme hypersonic environments is known as ultra-high temperature ceramics (UHTC). Usually, borides and carbides of transition materials are considered UHTC because of their high melting points, oxidation, and ablation resistance. Among them, ZrB2 has been investigated as a promising UHTC material for the hypersonic application. However, ZrB2 alone is not an ideal candidate because of its low fracture toughness and low oxidation resistance at high temperatures over 1400℃. To overcome such shortcomings, SiC is incorporated into ZrB2, improving the densification of ZrB2 and its oxidation resistance. More importantly, several studies have been performed to investigate the radiative properties of ZrB2-SiC composites and to discover methods to tailor the emissivity of this potential candidate. Ultimately, the outcome of these investigations is to find a material system which will be capable of radiating energy at high temperatures with maximum efficiency and will have improved ablation properties, and oxidation resistance. Date: Wednesday, December 1, 2021 Time: 8:00 AM 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@purdue.edu<mailto:ymorgan@purdue.edu>