Ultrafast high-temperature sintering (UHS)
Ultrafast high-temperature sintering (UHS) is a method in which materials are synthesized from salt or oxide precursors via ultrafast, high-temperature sintering. The UHS technique features a uniform temperature distribution, high heating (103 to 104 °C/min) and cooling rates (up to 104 °C/min), and high sintering temperatures (up to 3000 °C). In a typical UHS process, the heating elements ramp up from room temperature to the sintering temperature in ~30 s or less, in which the temperature ramping stage is followed by ~10 s of isothermal sintering and then rapid cooling (in ~5 s) (a UHS image shown in Fig. 1). In this regard, UHS is distinct from conventional high-temperature syntheses that feature slow and near-equilibrium heating at limited temperature ranges (e.g., 1500 K for furnace heating) for extended periods of time (typically hours) and generally slow heating and cooling (~10 K/min).
UHS utilizes high temperature to drive synthesis and sintering at extreme and non-equilibrium conditions. Additionally, the use of the ultra-high temperature can dramatically increase synthesis and sintering rates for rapid material production. As a result of these characteristics, UHS is particularly applicable for the general and rapid ceramic synthesis and sintering, novel post-sintering structures and materials production, 3D printing ceramic precursors manufacturing, in addition to well-defined interfaces between multilayer ceramic compounds.
Realization
The UHS method was invented by Dr. Liangbing Hu and his team at the University of Maryland, College Park. The technology is also patented.[1][2] The UHS was first realized by Joule heating of carbon materials to a high temperature with a short duration and rapid heating and quenching, which are controlled by electric power with a high temporal resolution. The essence of UHS is the ability to precisely control the high temperature to ensure rapid sintering. Generally, the temperature, duration, and ramping rate can be independently controlled for specific synthesis and sintering requirements.
Since high-temperature heating is ubiquitously used for reactions and materials synthesis, innovative UHS processes have been discovered and demonstrated, enabling the rapid experimental validation of new material predictions from computation, which facilitates materials discovery spanning a wide range of compositions. Several applications may benefit from this methodology, including ceramics, alloys, high-temperature materials, thin-film SSEs and battery applications.
This technique is first published on Science as a Cover article.[3] The UHS rapid sintering is also listed as a R&D 100 winner.[4]
References
- ↑ CA3140616A1, Hu, Liangbing & Chengwei Wang, "High temperature sintering systems and methods", issued 2020-11-26
- ↑ [1], Hu, Liangbing & Chengwei Wang, "High Temperature Sintering Systems and Methods", issued 2020-11-26
- ↑ Wang, Chengwei; Ping, Weiwei; Bai, Qiang; Cui, Huachen; Hensleigh, Ryan; Wang, Ruiliu; Brozena, Alexandra H.; Xu, Zhenpeng; Dai, Jiaqi; Pei, Yong; Zheng, Chaolun; Pastel, Glenn; Gao, Jinlong; Wang, Xizheng; Wang, Howard (May 2020). "A general method to synthesize and sinter bulk ceramics in seconds". Science. 368 (6490): 521–526. Bibcode:2020Sci...368..521W. doi:10.1126/science.aaz7681. ISSN 0036-8075. PMID 32355030 Check
|pmid=value (help). Unknown parameter|s2cid=ignored (help) - ↑ "UHS rapid sintering". Research & Development World. Retrieved 2022-09-09.
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