Advances in Powder and Ceramic Materials Science: Advanced Ceramics and Processes
Sponsored by: TMS Extraction and Processing Division, TMS Materials Processing and Manufacturing Division, TMS: Materials Characterization Committee, TMS: Powder Materials Committee
Program Organizers: Bowen Li, Michigan Technological University; Shefford Baker, Cornell; Huazhang Zhai, Beijing Institute of Technology; Kathy Lu, University of Alabama Birmingham; Rajiv Soman, Eurofins EAG Materials Science LLC; Faqin Dong, Southwest University of Science and Technology; Jinhong Li, China University of Geosciences (Beijing); Ruigang Wang, Michigan State University; Eugene Olevsky, San Diego State University

Monday 2:00 PM
March 15, 2021
Room: RM 37
Location: TMS2021 Virtual

Session Chair: Shefford Baker, Cornell University; Huazhang Zhai, Beijing Institute of Technology


2:00 PM  Invited
Effect of Diamond Content and Modality on the Densification of Diamond Particulate Ceramic Composites by Hot-pressing: Jerry Lasalvia1; Anthony DiGiovanni1; Kristopher Behler1; 1CCDC Army Research Laboratory
    Low pressure/high temperature (LPHT) methods such as reaction bonding are attractive for fabricating large lower-cost diamond-ceramic composites for structural, wear, and thermal management applications. As further exploration of LPHT methods, an initial study on the effects of diamond content and modality on the densification of diamond-SiB6 powder mixtures by hot-pressing are reported. Guided by a particulate percolation threshold model, for a given diamond content, diamond powders of two-to-three different particle sizes in several relative proportions were acoustically wet mixed with SiB6 powder. After drying, powders were hot-pressed at 1600oC for 60-120 mins under flowing high-purity Ar and 48 MPa. An LVDT recorded ram displacement from which densification history was determined. The resulting densities, phases, microstructures were determined. As expected, for complete densification, the maximum diamond content was higher for multi-modal particulate size distributions but strongly dependent on relative proportions. Further findings and experimental procedures will be discussed.

2:25 PM  
An Analysis on the Factors Affecting Oxidation Resistance of Silicon Containing Ultra High Temperature Borides Ceramics: Giuseppe Bianco Atria1; Arvind Agarwal1; Cheng Zhang1; Ambreen Nisar1; 1Florida International University
    The data on oxidation behavior of Silicon (Si) containing borides of the Group IV of metals ubiquitous in literature are analyzed to understand the effect of composition mixture, sintering parameters, densification, grain size, and testing conditions. It is fundamental to examine the reactions and physical phenomena undergoing during the oxidation process to be able to propose oxidation resistance measuring metrics. The main challenge to achieve such an analysis is to collect enough reliable data points to develop high-level comprehensive plots. In the present work, a conjunction of mathematical and statistical techniques has been utilized to converge the scattered datapoints into approximate functions to identify the influence of different parameters on the oxidation kinetics. The breakdown of this data will help the community to digest the fundamental properties of these materials to design innovative and superior thermal protective systems (TPS's) for new generation aerospace applications.