Showing papers by "Patrick S. Nicholson published in 1997"
TL;DR: In this paper, a constant current electrophoretic deposition (EPD) has been used to synthesize Al2O3/YSZ,Al2O 3/MoSi2, A12O 3 /Ni and YSZ/Ni functionally graded materials (FGM).
Abstract: Constant current electrophoretic deposition (EPD) has been used to synthesise Al2O3/YSZ,Al2O3/MoSi2, A12O3/Ni and YSZ/Ni functionally graded materials (FGM). EPD is a cheap and simple technique to fabricate complicated ceramic shapes. By this technique it is possible to synthesize step FGMs as well as continuous-profile FGMs. The profile can be controlled precisely by controlling the deposition current density, second component flow rate, suspension concentration, etc. The microstructures of the FGMs produced were characterized by optical and electron microcopy and micro-indentation was used to track the Vicker's hardness and fracture toughness variation across the composition profiles.
92 citations
TL;DR: In this paper, the vapour-deposited overgrowths of Na-β″-Al 2 O 3 that grow on single-crystal films at 1300-1350 °C have been studied by X-ray diffraction and electron microscopy.
2 citations
TL;DR: In this paper, the CVD growth of Na-β″(β)-Al2O3 has been simulated using fluoride and chloride precursors in dry and wet oxidising atmospheres in the temperature range from 1100 to 1600 K.
2 citations
TL;DR: In this paper, the surface features of Na-β″-Al2O3 single-crystal films grown on sapphire and micro α-Al 2O3 platelet substrates have been studied by atomic-force microscopy (AFM).
1 citations
TL;DR: In this article, the formation of the 110 K superconducting phase in the Bi-Pb-Sr-Ca-Cu-O system has been analyzed via Avrami theory, high-temperature X-ray diffractometry, scanning and transmission electron microscopy, and differential thermal analysis techniques.
Abstract: The kinetics and formation of the 110 K superconducting phase in the Bi-Pb-Sr-Ca-Cu-O system have been analyzed via Avrami theory, high-temperature X-ray diffractometry, scanning and transmission electron microscopy, and differential thermal analysis techniques. The kinetic study indicates that the reaction is diffusion controlled for oxygen partial pressures of {approximately}1--35 kPa (0.01--0.35 atm). The appearance of liquid increases the contact area of the reactant particles, thus accelerating mass transport and the phase formation kinetics. The 110 K phase forms via reaction between the 80 K phase, secondary phases that are rich in calcium and copper, and the liquid that contains lead, calcium/strontium, and copper.