Highly Transparent Polycrystalline MgO via Spark Plasma Sintering

Sakajio, Michal; Beilin, Vadim; Mann‐Lahav, Meirav; Zamir, S.; Shter, Gennady E.; Grader, Gideon S.

doi:10.1021/acsami.2c11775

Cited by 7 publications

(4 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The main carbon source in the SPS process is the carbon foil that is placed within the graphite mold to protect it. In a previous study of the carbon foils, a considerable weight loss was observed, which was associated with CO 2 release when performing simultaneous thermogravimetric analysis (TGA) and mass spectroscopy in Ar in the temperature range of 800 °C–1300 °C …”

Section: Resultsmentioning

confidence: 98%

“…Nevertheless, SPS is typically performed in a carbon-rich environment (e.g., using graphite tools and molds) to ensure electrical conduction. Consequently, samples are susceptible to carbon contamination, which considerably impairs their optical transparency. − …”

Section: Introductionmentioning

confidence: 99%

“…Carbon contamination during SPS can be decreased by adjusting the SPS profile (i.e., heating rate, pressure, dwell time, etc. ), ,, which is usually constrained by the need to maximize density, or introducing sintering aids such as LiF and MgF 2 . ,− The introduction of additives during SPS promotes densification but is frequently accompanied by uncontrolled grain growth, which harms the mechanical and optical properties.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Carbon Contamination Prevention during Spark Plasma Sintering

Sakajio

Shter

Mann‐Lahav

et al. 2023

ACS Appl. Mater. Interfaces

Self Cite

View full text Add to dashboard Cite

Carbon contamination from graphite molds during spark plasma sintering (SPS) considerably affects the properties of the sintered materials, especially transparent ceramics. Herein, transparent Y 3 Al 5 O 12 (YAG) ceramics were prepared via SPS using Mo and Ta foils, separately and in tandem, as protective barriers against carbon contamination. The effects of Ta and Mo foils on the transparency and microstructure of the ceramics, and their protection mechanisms were studied. Experimental results show that a reaction layer formed at the Ta−YAG interface with a YTaO 4 −Al 2 O 3 eutectic composition suppresses carbon penetration into the ceramic, increasing its transparency. By contrast, Mo foils, when used as protective barriers, allow carbon diffusion into the ceramic, resulting in the formation of nonuniform microstructural features. However, it does not form a reactive layer and, hence, is removed easily from the YAG surface. Multilayered Ta−Mo barrier exhibits improved outcomes if the Ta thickness is more than ∼100 μm. This behavior is attributed to the interior diffusion-blocking mechanism of Ta. Similar optical performance was demonstrated by both approaches. The results prove that carbon contamination in SPS-derived samples can be effectively prevented. Additionally, this study reports on a novel strategy of bonding oxide ceramics to metals by adding a Ta layer at the joint interface.

show abstract

Section: Resultsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Carbon Contamination Prevention during Spark Plasma Sintering

Sakajio

Shter

Mann‐Lahav

et al. 2023

ACS Appl. Mater. Interfaces

Self Cite

View full text Add to dashboard Cite

show abstract

“…SPS rapidly heats the materials under uniaxial pressure to produce high density ceramics. The ability to apply very high heating and cooling rates, short residenc times, and sintering at relatively low temperatures limits grain growth during densifica tion [54]. SPS can be categorized as a low-temperature sintering technique, and the prin ciple of discharge plasma sintering is shown in Figure 4 [55].…”

Section: Spark Plasma Sinteringmentioning

confidence: 99%

Recent Novel Fabrication Techniques for Proton-Conducting Solid Oxide Fuel Cells

Yu,

Feng,

Liu

et al. 2024

Crystals

View full text Add to dashboard Cite

Research has been conducted on solid oxide fuel cells (SOFCs) for their fuel flexibility, modularity, high efficiency, and power density. However, the high working temperature leads to the deterioration of materials and increased operating costs. Considering the high protonic conductivity and low activation energy, the proton conducting SOFC, i.e., the protonic ceramic fuel cell (PCFC), working at a low temperature, has been wildly investigated. The PCFC is a promising state-of-the-art electrochemical energy conversion system for ecological energy; it is characterized by near zero carbon emissions and high efficiency, and it is environment-friendly. The PCFC can be applied for the direct conversion of various renewable fuels into electricity at intermediate temperatures (400–650 °C). The construction of the PCFC directly affect its properties; therefore, manufacturing technology is the crucial factor that determines the performance. As a thinner electrolyte layer will lead to a lower polarization resistance, a uniformly constructed and crack-free layer which can perfectly bond to electrodes with a large effective area is challenging to achieve. In this work, different fabrication methods are investigated, and their effect on the overall performance of PCFCs is evaluated. This article reviews the recent preparation methods of PCFCs, including common methods, 3D printing methods, and other advanced methods, with summarized respective features, and their testing and characterization results.

show abstract