Fabrication and microstructural stability of spark plasma sintered Al2O3/Er3Al5O12 eutectic

Özerdem, Ece; Ayas, Erhan

doi:10.1016/j.ceramint.2015.06.125

Cited by 19 publications

(6 citation statements)

References 42 publications

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“…Also, HfB 2 degradation and formation of HfC may be related with the applied pressure along with temperature. Indeed, such pressure effect on the formation of reactions during the pressure assisted formations have been also observed on different studies [30,[40][41][42].…”

Section: Resultsmentioning

confidence: 59%

Effect of SiC Particle Size on the Microstructural, Mechanical and Oxidation Properties of In-situ Synthesized HfB2-SiC Composites

2021

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Section: Resultsmentioning

confidence: 59%

Effect of SiC Particle Size on the Microstructural, Mechanical and Oxidation Properties of In-situ Synthesized HfB2-SiC Composites

2021

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“…Both the hardness and fracture toughness of the solidified Al 2 O 3 /EAG ceramic gradually increase with the increase of growth rate. When the growth rate v = 24 mm/h, the hardness and fracture toughness of the solidified Al 2 O 3 /EAG ceramic reach the maximum values of 21.57 GPa and 2.98 MPa·m 1/2 respectively, which are higher than those reported by Özerdem [27] or Mesa [19]. From Figure 6, the maximum hardness of the solidified ceramic is about 8.9 times that of the sintered ceramic with the same composition.…”

Section: Resultsmentioning

confidence: 70%

Microstructure and Mechanical Properties of Al2O3/Er3Al5O12 Binary Eutectic Ceramic Prepared by Bridgman Method

et al. 2018

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Directionally solidified Al2O3/Er3Al5O12 (EAG) eutectic ceramic was prepared via vertical Bridgman method with high-frequency induction heating. The effects of the growth rate on the microstructure and mechanical properties of the solidified ceramic were investigated. The experimental results showed that there were no pores or amorphous phases in the directionally solidified Al2O3/EAG eutectic ceramic. Al2O3 phase was embedded in the EAG matrix phase, and the two phases were intertwined with each other to form a typical binary eutectic “hieroglyphic” structure. With the increase of growth rate, the phase size and spacing of the solidified Al2O3/EAG ceramic both decreased, and the growth rate and phase spacing satisfied the λ2v ≈ 60 formula of Jackson-Hunt theory. The cross section microstructure of the solidified ceramic always exhibited an irregular eutectic growth, while the longitudinal section microstructure presented a directional growth. The mechanical properties of the solidified ceramic gradually increased with the increase of growth rate, and the maximum hardness and fracture toughness could reach 21.57 GPa and 2.98 MPa·m1/2 respectively. It was considered that the crack deflection and branching could enhance the toughness of the solidified ceramic effectively.

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“…Additionally, a Y-depleted YAG composition was detected adjacent to the interface. Recent studies have reported that the eutectic structure of ceramic powders with a eutectic composition may be generated via SPS. − Özerdem et al reported that the applied pressure during SPS considerably affects the melt formation below the theoretical eutectic temperature . To the best of our knowledge, a ternary diagram of the Al 2 O 3 –Y 2 O 3 –Ta 2 O 5 system has not been reported in the literature.…”

Section: Resultsmentioning

confidence: 96%

“…16−19 O ̈zerdem et al reported that the applied pressure during SPS considerably affects the melt formation below the theoretical eutectic temperature. 19 To the best of our 21 It is hypothesized that the improved transparency of the C-Ta-YAG-Ta-C sample is because the reaction layer is an effective barrier against carbon transport. To further study the possible mechanisms occurring between Ta and YAG during thermal treatment (i.e., phase transition, SSR, melting, and so forth), mixtures of YAG and Ta 2 O 5 (99.85%, Alfa Aesar) powders with different compositions (see Table 2) were prepared, and their thermal behavior was studied via differential thermal analysis (DTA).…”

Section: Resultsmentioning

confidence: 99%

Carbon Contamination Prevention during Spark Plasma Sintering

Sakajio

Shter

Mann‐Lahav

et al. 2023

ACS Appl. Mater. Interfaces

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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.

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Fabrication and microstructural stability of spark plasma sintered Al2O3/Er3Al5O12 eutectic

Cited by 19 publications

References 42 publications

Effect of SiC Particle Size on the Microstructural, Mechanical and Oxidation Properties of In-situ Synthesized HfB2-SiC Composites

Effect of SiC Particle Size on the Microstructural, Mechanical and Oxidation Properties of In-situ Synthesized HfB2-SiC Composites

Microstructure and Mechanical Properties of Al2O3/Er3Al5O12 Binary Eutectic Ceramic Prepared by Bridgman Method

Carbon Contamination Prevention during Spark Plasma Sintering

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