Thesis (M.S.)--University of Nevada, Reno, 2006. / "December 2006." Includes bibliographical references. Online version available on the World Wide Web.

Thesis (M.S.)--University of Nevada, Reno, 2007. / "December 2007." Includes bibliographical references (leaves 54-58). Online version available on the World Wide Web.

Thesis (Ph. D.)--Lehigh University, 1997. / Includes vita. Bibliography: leaves 175-185.

Thesis (Master)--İzmir Institute of Technology, İzmir, 2006 / Keywords: Anorthite, boric acid, colemanite, statistical experimental design, X ray diffraction. Includes bibliographical references (leaves. 57-59).

Thesis (Ph. D.)--Drexel University, 2005. / Includes abstract and vita. Includes bibliographical references (leaves 120-127).

Recently there has been an increased interest in the generation of ceranlic powders composed of nanosize particles with a narrow size-distribution and high purity. It has been shown that ceramics sintered from these ultrafine partic1es exhibit improved mechanical and electrical properties. The present research has attempted to control the growth of the ceramic particles in a relatively simple continuous flow process by placing charges on the forming particles and controlling their evolution with an electric field. Nanosize TiO₂ powder was produced using a multi-stream, co-annular reactor. The heat source was a cylindrical H₂/0₂ diffusion flame located around the outside of reaction zone. The effect on the powder size, shape, and size distribution due to particle charging, applied electric fields, and varying reactant concentrations were investigated. The temperature field within the reaction zone was uniform radially and ramped axially from 600 to 1100 K. The reactant stream passed through a 10 millicurie Po-21 0 alpha source within the burner with the intention of creating a bipolar ion concentration. In the presence of an electric field, this ionization can lead to either a unipolar-negative or unipolar-positive particle charging environment. The electric field across the reaction zone was varied in an attempt to control particle residence time. / Master of Science

Processing of (Ca_0.6, Mg_0.4)Zr₄(PO₄)₆ [CMZP] powder synthesized by sol-gel techniques was investigated. Amorphous powder was cold pressed/sintered and hot pressed. Cold pressing CMZP, followed by controlled drying and sintering, resulted in maximum relative densities of 96% when using 2wt% of a sintering aid (ZnO). When increasing ZnO content to ≥ 5wt%, a second phase ((ZrO)₂P₂O₇) was formed. Hot pressing conditions were optimized to yield the highest room temperature flexure strength. Mechanical properties of the hot pressed CMZP at room temperature were: (1) a four-point flexure strength of 124.77 MPa, (2) an elastic modulus of 118.45 GPa, and (3) a Weibull modulus of 10.7. At 850°C, the flexure strength and elastic modulus were 118.35 MPa and 68.63 GPa while at 1050°C they were 89.57 MPa and 78.27 GPa. Samples tested at 1250°C creeped during loading. The fracture toughness K_c of hot pressed CMZP was determined to be 1.145 MPa·√m by indentation. Breaking multiple-indented bars in a four-point bend resulted in a fracture toughness value of 1.269 MPa·√m. The coefficient of thermal expansion (CTE) on heating from 25°C to 1000°C was 2.64 x 10⁻⁶/°C and did not change on cycling ten times to 1000°C. No thermal expansion hysteresis was observed. Elevated temperature X-ray diffraction (XRD) revealed that the hot pressed CMZP remained single phase when heated to 1200°C and cooled to room temperature. / Master of Science

No description available.

Thesis (doctoral)--Technische Universiteit Delft, 1998. / Includes bibliographical references.

Thesis (doctoral)--Technische Universiteit Delft, 1998. / Includes bibliographical references.