The cold sintering process (CSP) densifies ceramics at much lower temperatures than conventional sintering processes. Several ceramics and composite systems have been successfully densified under cold sintering. For the grain growth kinetics of zinc oxide, reduced activation energies are shown, and yet the mechanism behind this growth is unknown. Herein, we investigate these mechanisms in more detail with experiments and ReaxFF molecular dynamics simulations. We investigated the recrystallization of zinc cations under various acidic conditions and found that their adsorption to the surface can be a rate-limiting factor for cold sintering. Our studies show that surface hydroxylation in CSP does not inhibit crystallization; in contrast, by creating a surface complex, it creates an orders of magnitude acceleration in surface diffusion, and in turn, accelerates recrystallization.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1002/anie.201904738 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Densification of hydroxyapatite/zirconia nanocomposites fabricated via low-temperature mineralization sintering process and their mechanical properties.
Sci Rep
January 2025
SANKEN, Osaka University, 8-1 Mihogaoka, Ibaraki, 567-0047, Osaka, Japan.
Hydroxyapatite/zirconia (HAP/ZrO) composites were fabricated via the low-temperature mineralization sintering process (LMSP) at an extremely low temperature of 130 °C to enhance the mechanical properties of HAP and broaden its practical applications. For this purpose, 5-20 vol% calcia-stabilized ZrO were introduced into HAP, and HAP/ZrO nanoparticles, mixed with simulated body fluid, were densified under a uniaxial pressure of 800 MPa at 130 °C. At 10 vol% ZrO, the relative density of the HAP/ZrO composite was determined to be 88.
View Article and Find Full Text PDFBenchtop Machining of Self-Standing Alumina Doughs for Low-Number Fabrication and Prototyping.
ACS Appl Mater Interfaces
January 2025
Faculty of Engineering and Natural Sciences, Sabanci University, Istanbul 34956, Turkey.
Cold isostatic pressing, gel casting, and protein coagulation are the most common techniques to produce green bodies prior to computer numerical control (CNC)-based machining for the near-net-scale shaping of ceramics. These methods typically involve various additives and entail several steps to create a green body that is capable of withstanding machining forces. Here, utilizing a single additive, we first introduced a facile benchtop method to generate self-standing, malleable doughs of alumina in under 2 min.
View Article and Find Full Text PDFTwo-step sintering suppresses grain growth and improves flexural strength of dental zirconia.
Dent Mater
February 2025
Department of Preventive and Restorative Sciences, School of Dental Medicine, University of Pennsylvania, PA 19104, USA. Electronic address:
Objectives: This study aimed to elucidate the effect of various two-step sintering (TSS) protocols on the physical, mechanical, and optical properties of partially stabilized zirconia with different yttria dopant concentrations (Y-PSZ).
Methods: Disc-shaped specimens were obtained from most widely used commercial dental zirconia powders of various Y contents (Tosoh Corp.) by uniaxial pressing followed by cold-isostatic pressing.
Effect of Carbon Black Content and Firing Atmosphere on the Properties and Microstructure of AlO-SiC-C Castables.
Materials (Basel)
November 2024
School of Materials Science and Engineering, Henan Key Laboratory of High Temperature Functional Ceramics, Zhengzhou University, Zhengzhou 450001, China.
AlO-SiC-C (ASC) castables containing spherical asphalt are widely utilized in high-temperature metallurgical furnaces because of their good abrasive resistance and slag resistance; however, the release of hazardous benzopyrene during the pyrosis process in spherical asphalt is detrimental to the environment and to the health of furnace workers. Herein, nontoxic nano carbon black (CB) was selected as the carbon source for ASC castables, and the effects of the CB amount and sintering atmosphere on the properties of ASC castables were investigated in this work. The results show that on increasing CB from 0.
View Article and Find Full Text PDFCold Sintering Halide-in-Oxide Composite Solid-State Electrolytes with Enhanced Ionic Conductivity.
ACS Appl Mater Interfaces
December 2024
The Harold and Inge Marcus Department of Industrial and Manufacturing Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States.
All-solid-state batteries (ASSBs) have attracted increasing attention for next-generation electrochemical energy storage due to their high energy density and enhanced safety, achieved through the use of nonflammable solid-state electrolytes (SSEs). Oxide-based SSEs, such as LiAlTi(PO) (LATP), are notable for their high ionic conductivity and excellent chemical and electrochemical oxidation stability. Nevertheless, their brittle mechanical properties and poor interface contact with electrode materials necessitate high-temperature and long-duration sintering or postcalcination processes, limiting their processability for real-world applications.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!