Fabrication and Characterization of Novel Refractory Coatings Using Combinatorial Nanocalorimetry.

摘要

The main goal of this project was to investigate by means of nanocalorimetry both the synthesis of diboride-based coatings using reactive multilayers and their oxidation behavior. At the onset of the project, a scanning AC nanocalorimetry technique was developed to make nanocalorimetry measurements possible at the elevated temperatures required for the project. This novel technique enables nanocalorimetry measurements over a wide range of temperatures and scanning rates not accessible to other calorimetry techniques. The dynamic range of the technique makes it ideal for analyzing the thermodynamics and kinetics of phase transformations, solid-gas reactions, and solid- state reactions in thin-film samples. The report summarizes the results of solid-state reaction in Zr/B and Zr/B4C multilayers, oxidation of ZrB2, the effect of Nb and C doping on the oxidation of ZrB2, and tensile experiments on ZrB2 thin films.