Manufacturing and Processing of Advanced Ceramic Materials: Processing of Carbides, Borides, and Nitrides
Sponsored by: ACerS Manufacturing Division
Program Organizers: Bai Cui, University of Nebraska Lincoln; James Hemrick, Oak Ridge National Laboratory; Mike Alexander, Allied Mineral Products; Eric Faierson, Iowa State University; Keith DeCarlo, Blasch Precision Ceramics
Wednesday 10:00 AM
October 20, 2021
Room: B234
Location: Greater Columbus Convention Center
Session Chair: Brian Leonard, University of Wyoming; Fei Wang, University of Nebraska–Lincoln
10:00 AM Invited
Low Temperature Synthesis Methods for Nanoparticle Carbides: Brian Leonard1; 1University of Wyoming
Traditional synthesis methods of transition metal carbides typically require extreme temperatures in excess of 1500°C which severely limits control over particle size and shape. In addition, forming metal carbide compounds with multiple metals and controllable composition becomes more challenging as the reaction temperatures and particle sizes decrease. Our lab specializes in unique synthesis methods that allow for the formation of metal carbide compounds with complex, controllable compositions, and particles sizes in the nanometer regime. Using a variety of carbon sources and metals, we have been able to synthesize carbides with control over their morphology including nanowires, plates, and small spheres. This presentation will focus on some of the mechanistic considerations necessary to synthesize metal carbide nanomaterials with tailored properties.
10:40 AM
Bulk Amorphous SiCN Produced through Plasma Synthesis and Spark Plasma Sintering: Steven Herzberg1; Suveen Mathaudhu1; Lorenzo Mangolini1; 1University of California, Riverside
Silicon carbonitrides (SiCNs) have gained interest as an engineering ceramic due to their high hardness, good oxidation, and good creep resistances at high temperatures. Most bulk SiCNs are made from pyrolysis of polymer precursors to form an amorphous powder followed by consolidation via sintering at high temperatures. These high temperatures result in crystallization of amorphous SiCN into a SiC/SiN composite, leaving few reports on the properties bulk amorphous SiCN. This work looks to create bulk amorphous SiCN from gaseous precursors through a combination of nonthermal plasma synthesis to form amorphous SiCN nanoparticles and spark plasma sintering to consolidate into a bulk amorphous form. By altering the ratios of the gaseous precursors in plasma synthesis, the resulting structural properties of SiCN are reported at various compositions.
11:00 AM
Development of New Synthesis Route for Environmentally Friendly Thermoelectric Rare Earth Borocarbonitrides for Upcoming Carbon-neutral Society: Hyoung-Won Son1; Takao Mori2; Masatoshi Takeda1; David Berthebaud2; Philipp Sauerschnig3; Quansheng Guo2; Tadachika Nakayama1; 1Nagaoka University of Technology; 2National Institute for Materials Science; 3National Institute of Advanced Industrial Science and Technology
Borides are prospective candidates for high temperature thermoelectric applications owing to their attractive properties such as high melting point and excellent hardness. Especially, the homologous series of rare earth borocarbonitrides, RB15.5CN and RB22C2N, were found to exhibit n-type semiconducting behaviors and possess similar crystal structures to p-type boron carbides, and thus they are expected to be applicable as n-type counterparts in a new-type boride-based thermoelectric generator. Moreover, these compounds capture carbon atoms and form 3-dimensional network structure during synthesis. Therefore, they might be able to contribute to upcoming “Carbon-Neutral Society” by reusing carbon waste. In the conventional process for synthesis of these materials, however, a complex process involving time-consuming and multiple re-sintering steps are required. In this study, we have synthesized RB15.5CN/RB22C2N composites via spark plasma sintering utilizing gas/solid reaction technology. This newly developed synthesis technique could facilitate the rapid and cost-effective preparation of environmentally friendly rare earth borocarbonitrides.