Self-Healing Behavior of Y&lt;sub&gt;2&lt;/sub&gt;SiO&lt;sub&gt;5&lt;/sub&gt; Toughened by SiC Particles

Vu, Huy Dinh; Nanko, Makoto

doi:10.4028/www.scientific.net/kem.728.149

Cited by 6 publications

(2 citation statements)

References 6 publications

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“…The starting powders used to fabricate the composites were single-phase Y 2 SiO 5 synthesized via a solid-state reaction technique 20) and a commercial high-purity SiC powder (0.32 µm mean particle size, 99.9% purity, Ibiden Co., Ltd). A slurry mixture consisting of Y 2 SiO 5 and 5 vol% SiC powder was ball-milled with ethanol and alumina balls in a plastic bottle for 24 h. The ceramic slurry was dried at 100°C for 10 h and milled manually by an alumina mortar to eliminate the agglomeration of particles.…”

Section: Methodsmentioning

confidence: 99%

“…We have proposed the self-healing ceramic composites which will be applied for EBC systems. 20) Crack-healing ability induced by thermal oxidation has been investigated for SiC particles in Y 2 SiO 5 matrix. Although a crack-healing function was discovered in SiC/Y 2 SiO 5 , influences of heat treatment condition such as time and temperature as well as mechanism of the crack-healing have not been investigated well.…”

Section: Introductionmentioning

confidence: 99%

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Crack-Healing Behavior and Mechanical Strength Recovery of 5 vol% Silicon Carbide Particle Dispersed Yttrium Monosilicate Composites

Nanko²

2019

Mater. Trans.

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Crack-healing effectiveness was investigated as functions of heat treatment time and temperature on 5 vol% SiC-dispersed Y 2 SiO 5 -based composites. Dense specimens of SiC/Y 2 SiO 5 composite were fabricated by the pulsed current sintering technique. Thermal oxidation for crackhealing was conducted at temperatures ranging from 1000 to 1300°C for from 1 to 24 h in air. Bending tests were carried out at room temperature on samples before and after heat treatment in order to clarify the crack-healing performance. The results show that SiC/Y 2 SiO 5 composites possess a considerable crack-healing ability. The surface cracks with approximately 200 µm in length introduced on the sample surface were disappeared completely after heat treatment at 1300°C for 1 h in air. Mechanism of crack-healing was considered as filling up of cracks by Y 2 Si 2 O 7 oxidation product which is formed by outward diffusion of cations. Bending strength of samples introduced surface cracks after heat treatment was recovered up to the level as high as that of as-sintered samples. [

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Crack-Healing Behavior and Mechanical Strength Recovery of 5 vol% Silicon Carbide Particle Dispersed Yttrium Monosilicate Composites

Nanko²

2019

Mater. Trans.

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Influence of water vapor partial pressure on self-healing and oxidation of SiC-dispersed yttrium silicate composites

Thi Nguyen,

Kuo,

Nanko

2025

Journal of the European Ceramic Society

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Crack-healing performance and oxidation behavior of SiC dispersed yttrium silicate composites

Nanko

2020

Journal of Asian Ceramic Societies

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Yttrium silicate-based composites dispersed with silicon carbide particles have been proposed as a novel material concept of self-healing environmental barrier coatings applied for Si-based ceramics and their composites. Crack-healing effectiveness as well as high-temperature oxidation behavior of the yttrium silicate composites was investigated as functions of oxidation time and temperatures. Dense samples of the composites dispersed with 5 vol% SiC particles were fabricated by using the pulsed electric current sintering technique. Thermal oxidation for selfhealing was conducted at temperatures ranging from 1000°C to 1300°C for from 1 to 24 h in air. High-temperature oxidation experiments were carried out at temperatures ranging from 1200°C to 1400°C for from 1 to 60 h in air. As a result, the surface cracks with approximately 200 µm in length introduced on the sample surface were disappeared completely after heat treatment at 1300°C for 1 h in air. Crack-healing performance of SiC/Y 2 SiO 5 is better than that of SiC/Y 2 Si 2 O 7. The crack-healing performance of SiC/Y 2 SiO 5-Y 2 Si 2 O 7 is in the middle of that of SiC/Y 2 SiO 5 and SiC/Y 2 Si 2 O 7. The mechanism of crack healing was identified as the consequence of SiC oxidation into SiO 2 , which accompanies a volume expansion, and outward diffusion of Y 3+ cations caused the formation of Y 2 Si 2 O 7 outer layer. Oxidation of SiC particles within the matrix developed an oxidized zone. Growth of the oxidized zone obeyed the parabolic law, which meant diffusion process in the oxidized zone is the rate-controlling process.

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Self-Healing Behavior of Y<sub>2</sub>SiO<sub>5</sub> Toughened by SiC Particles

Cited by 6 publications

References 6 publications

Crack-Healing Behavior and Mechanical Strength Recovery of 5 vol% Silicon Carbide Particle Dispersed Yttrium Monosilicate Composites

Crack-Healing Behavior and Mechanical Strength Recovery of 5 vol% Silicon Carbide Particle Dispersed Yttrium Monosilicate Composites

Influence of water vapor partial pressure on self-healing and oxidation of SiC-dispersed yttrium silicate composites

Crack-healing performance and oxidation behavior of SiC dispersed yttrium silicate composites

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