Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 741 for “"ceramics"”.
-
Binder removal in ceramics
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1990.
-
Granular Shape Memory Ceramics
Shape memory ceramics (SMCs) are burgeoning functional materials based on zirconia with a reversible, stress-inducible martensitic phase transformation. Compared to metallic shape memory alloys, SMCs have broader operating temperatures, higher critical stresses, and larger mechanical hysteresis …
-
Interfacial Phenomena in Electrical Ceramics and the Design and Fabrication of Semiconducting Ceramics
… that the advantages offered by electrical ceramics are inherently connected with their microstructure; and the properties they control, depend critically on the boundary conditions existing at internal surfaces or grain boundaries. In this thesis, the design, fabrication, and …
-
Geopolymer-derived ceramics and composites
The development of ceramics and composites from geopolymer precursors is leading to exciting new avenues in ceramic synthesis and composite applications. In this work, we developed, synthesized, and characterized materials derived from geopolymers for use in extreme environments. In the first …
-
Solid particle erosion of ceramics
The zeolite ZSM-5 is well-known for its unique intersecting channel system. This channel system has a great bearing on the shape-selective properties and the long life-times of ZSM-5. In this study, ZSM-5 was modified in various ways to eliminate the external acidity of the catalyst to further …
-
Thermal shock resistance of ceramics.
Thesis: M.S., Massachusetts Institute of Technology, Department of Metallurgy and Materials Science, 1973
-
Transformation induced plasticity in ceramics
Transformation induced plasticity was investigated in a model ceramic. The effect upon toughness of the martensitic transformation from the cubic (paraelectric) to the tetragonal ( ferroelectric) phase in BaTiO3 was determined. The K1C fracture toughness, as measured by the hardness indentation …
-
Flash Sintering of Alumina-based Ceramics
… and electronic conductors and on semiconductor ceramics. In the present work, we studied the flash sintering behavior of a resistive technical ceramic like alumina also in the presence of magnesia silicate glass phase typically used for activating liquid phase sintering. The materials were …
-
Indirect selective laser sintering of ceramics
Ceramics with intricate geometries are useful in a wide range of technical applications, but current manufacturing techniques limit the geometric complexity. Additive manufacturing (AM) is a viable approach to surmount these limitations and produce complex tailored structures. However, ceramic …
-
Spectroscopic analysis of selected silicon ceramics
Silicon ceramics are popular in both commercial applications and material research. The purpose of this thesis is to present measurements and analysis of four different silicon ceramics: α, β and γ phases of silicon nitride and silicon oxynitride using soft x-ray spectroscopy, which analyses the …
-
Mechanical properties of boride based ceramics
<p>“This research focuses on the elevated mechanical properties of diboride based materials at room and elevated temperatures. These materials include a ZrB<sub>2</sub> ceramic, a ZrB<sub>2</sub>-WC-SiC ceramic, and a (Hf,Mo,Nb,Ta,W,Zr)B<sub>2</sub> high entropy boride (HEB). The room temperature …
-
Shape memory ceramics in small volumes
Shape memory ceramics rely on martensitic transformations which are similar to those found in metallic shape memory materials, but ceramics offer several advantages over metals such as higher operating temperatures and larger transformation stresses. However, polycrystalline shape memory ceramics …
-
Size Effects in Shape Memory Ceramics
Bulk shape memory ceramics (SMCs) are attractive for their high transformation temperatures and transformation stresses compared to shape memory metals but exhibit transformation-induced cracking due to mismatch stresses arising at the grain boundaries. Current strategies for mitigating cracking in …
-
Ionic mobility and superplasticity in ceramics
Superplasticity and superionic conductivity (SIC), both thermally activated processes, have been independently observed in certain materials with a high diffusion coefficient in high temperature ranges. Intuitively, this observation leads one to the idea that both types of behavior may be …
Page 1 of 38