Manufacturing and Processing of Advanced Ceramic Materials: Processing of Oxide Ceramics
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
Tuesday 2:00 PM
October 19, 2021
Room: B234
Location: Greater Columbus Convention Center
Session Chair: Yiquan Wu, Alfred University
2:00 PM Invited
Effects of Sintering Additive and Oxygen Partial Pressure on Solid-state Single-crystal Growth of YAG Ceramics: Iva Milisavljevic1; Guangran Zhang1; Yiquan Wu1; 1Alfred University
Solid-state single crystal growth (SSCG) has been recognized in recent years as a promising alternative method for the growth of single-crystals. However, despite its numerous advantages over conventional techniques, the knowledge about the SSCG method is still very limited. In this work, we used Y3Al5O12 (YAG) to investigate the effects of different sintering additives such as MgO, CaO, and SiO2 on the single-crystal conversion phenomenon during the spark plasma sintering. Polished YAG single-crystal seeds buried inside the powder samples before sintering were used to investigate the conversion of the polycrystalline ceramic matrix. The effects of sintering parameters and the oxygen partial pressure (pO2) on the conversion kinetics and mechanism were also discussed.
2:40 PM
Unique Technological Advantages and Progress towards Manufacturing Scale-up: Sun Hwi Bang1; Clive Randall1; 1Pennsylvania State University
Cold sintering is an emerging powder processing methodology that enables the densification of ceramics and ceramic-based composites at significantly lower temperatures and shorter processing time comparing to conventional sintering processes. The immediate engineering impacts of the reduced ceramic processing temperatures not only enables energy-saving sustainable manufacturing practices but also densifications of thermodynamically metastable materials. Despite its unique technological importance, the fundamental understanding of cold sintering mechanochemical kinetics and densification mechanisms is still in the very early stages of the investigation. One of the crucial objectives for understanding its fundamental science is to predict densification behaviors under different processing conditions and to obtain a uniform microstructure at high density with controlled grain size. Based on the identified foundational knowledge of the cold sintering process where zinc oxide is used as a model system, pilot-scale manufacturing implementations and potential directions are discussed.