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Articles 1 - 4 of 4
Full-Text Articles in Ceramic Materials
Spark Plasma Sintering Of Alumina With Controlled Porosity, Harshail Patet
Spark Plasma Sintering Of Alumina With Controlled Porosity, Harshail Patet
Discovery Day - Daytona Beach
Alumina is one of the most widely used advanced ceramics, serving applications that range from dense structural and wear-resistant components to porous thermal insulation and filtration systems. Porosity is a defining microstructural feature that governs mechanical strength, thermal conductivity, and permeability, meaning different applications demand different porosity levels from the same material. Spark plasma sintering (SPS) enables rapid consolidation by simultaneously applying pulsed electric current and uniaxial pressure, offering precise control over density, grain size, and porosity in significantly shorter processing times than conventional sintering. While prior studies have investigated the individual effects of SPS parameters on alumina densification, a …
In-Situ Investigations Of Calcium-Magnesium-Aluminosilicates (Cmas) Infiltration Effects On Thermal Barrier Coatings Under Extreme Environments Replicating Jet Engines, Zachary Stein
Doctoral Dissertations and Master's Theses
Calcium-magnesium-aluminosilicate (CMAS) particulates, such as sand or volcanic ash, are ingested by gas turbine jet engines during operation. When operating within high abundance regions, these particulates negatively interact and degrade the high temperature thermal barrier coatings (TBC) protecting underlying superalloy turbine blades vital to engine operation. These CMAS particulates melt within the engine and infiltrate into the ceramic coatings. In electron-beam physical vapor deposited (EB-PVD) TBCs, the CMAS within the intercolumnar gaps stiffens the coatings and causes thermomechanical induced high stress concentrations, risking crack formation. While molten, the CMAS thermochemically alters and destabilizes the coating, also risking coating failure. Premature, …
Active Measurement Of A Micron-Order Gap Under High-Speed And High-Temperature Conditions, Andrew Becker
Active Measurement Of A Micron-Order Gap Under High-Speed And High-Temperature Conditions, Andrew Becker
Doctoral Dissertations and Master's Theses
The hypersonic regime poses numerous challenges that researchers face in the development of hypersonic flight vehicles. Due to their excellent thermomechanical properties, ultra-high-temperature ceramics (UHTCs) have risen as a promising solution to act as a protective barrier between the harsh environment and surface materials of these flight bodies. The mechanical operation of a portable hypersonic simulation device was developed in-house and tested at Argonne National Laboratories (ANL) to gather in-situ material response of prospective UHTC samples when exposed to a hypersonic regime. An edge detection-based algorithm was developed and used in LabVIEW to monitor the health and operation of the …
Mno2 Nanoscale Interface Modification, Alexander C. Skoppe
Mno2 Nanoscale Interface Modification, Alexander C. Skoppe
Doctoral Dissertations and Master's Theses
Interface modification of carbon fibers has been shown to improve the mechanical performance of composites. In addition, interface modification of carbon fiber composites can impart multifunctionality into the resulting composite. This work will explore ZnO and MnO2 as interface modifications for use on carbon fibers. When exposed to high temperatures, carbon fibers undergo fiber degradation, leading to the need for low-temperature hydrothermal processes. This work will develop and characterize a nanoscale ZnO and MnO2 interface modification for use on carbon fibers. These nanomodifications will be developed with low-temperature processes, minimizing the fiber degradation that the fibers undergo. Fourier transform infrared …