|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Fundamental Aspects and Modeling Powder Metal Synthesis and Processing
||Effect of Additives on the Densification Kinetics and Microstructure of Hot-Pressed Boron Suboxide
||Kristopher D. Behler, Cooper A Voigt, Eugene R Shanholtz, Jerry C LaSalvia, Scott D Walck
|On-Site Speaker (Planned)
||Kristopher D. Behler
Isothermal hold experiments have been conducted at various temperatures ranging from 1700 – 1850°C in order to investigate the hot-pressing densification kinetics of a boron suboxide (B6O) powder with and without additives. Additives based on Al2O3 and SiO2 (2 – 5 vol%) were acoustically mixed with B6O powder. The densification kinetics and resulting microstructures were found to be significantly influenced by the additives, lowering the onset of rapid densification and activation energy. SEM, EDS, and XRD were utilized to determine the starting powder morphology and composition in addition to the microstructure and phases present within consolidated samples. The starting B6O powder was found to be oxygen deficient, and contained both boron and magnesium borate phases. For the hot-pressed specimens, the presence of Al2O3 and SiO2 additives resulted in the formation of aluminum borate and possibly borosilicate, respectively. Experimental procedures, analyses, and results are presented.