☆ 4.7 Article

Thermal, electrical, and mechanical properties of pressureless sintered silicon carbide ceramics with yttria-scandia-aluminum nitride

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY (2016)

期刊

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY

卷 36, 期 11, 页码 2659-2665

出版社

ELSEVIER SCI LTD

DOI: 10.1016/j.jeurceramsoc.2016.04.014

关键词

SiC; Pressureless sintering; Electrical properties; Thermal properties; Mechanical properties

类别

Materials Science, Ceramics

资金

Business for Cooperative R&D between Industry, Academy and Research Institute grant - Korea Small and Medium Business Administration [C0296400]
Korea Technology & Information Promotion Agency for SMEs (TIPA) [C0296400] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)

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摘要

The effects of the polytype of SiC starting powders on the thermal, electrical, and mechanical properties of pressureless sintered SiC ceramics with a new additive system (6.5 vol% Y2O3-SC2O3-AlN) were investigated. Powder mixtures prepared from alpha- or beta-SiC powders were sintered at 1950 degrees C for 6 h in a nitrogen atmosphere without an applied pressure. We found that both specimens could be sintered to >96% of the theoretical density without an applied pressure. The SiC ceramic fabricated from beta-SiC powders showed lower electrical resistivity, higher thermal conductivity, and better mechanical properties than that from beta-SiC powders. The flexural strength, fracture toughness, hardness, electrical resistivity and thermal conductivity values of the SiC ceramics fabricated from beta-SiC powders were 520 MPa, 5.1 MPa m(1/2), 25.0 GPa, 6.7 x 10(-1) Omega cm and 110 Wm(-1) K-1 at room temperature, respectively. The new additive system achieved the highest thermal conductivity in pressureless liquid-phase sintered SiC ceramics. (C) 2016 Elsevier Ltd. All rights reserved.

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Summary: The limited densification of CeO2 ceramics was improved by using an anorthite-based glass, resulting in high dielectric constant and quality factor with minimum dielectric loss. The CeO2-(anorthite-based) glass ceramic showed promising results in terms of low temperature densification and microwave properties.

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY (2024)

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Article Materials Science, Ceramics

High speed impact and solid-state deposition of alumina particles: A molecular dynamics study

S. Rahmati, R. G. A. Veiga, J. Mostaghimi, T. Coyle, A. Dolatabadi

Summary: This study provides an atomic-scale description of the high-velocity impact of alpha-Al2O3 particles onto an alpha-Al2O3 substrate during Aerosol Deposition (AD). The results suggest that the crystal orientation plays a crucial role in both plasticity and damage of the nanoparticles. Impact velocity has a direct correlation with plasticity and fragmentation, but adhesion efficiency has only a marginal increase. The crucial element lies in the substrate's surface alterations caused by the fragments left on the substrate after impact.

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY (2024)

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Article Materials Science, Ceramics

Long-term ablation mechanisms of the YB4-Al2O3-Si3N4 modified Cf/ HfC-SiC composites at 2600 °C

Bo-Wen Chen, Yan-Mei Kan, De-Wei Ni, Chun-Jing Liao, Hong-Da Wang, Yu-Sheng Ding, Shao-Ming Dong

Summary: This study characterized the long-term and repeated ablation properties of modified Cf/HfC-SiC composites with YB4-Al2O3-Si3N4 under an air plasma torch. The structural stability and viscosity of the oxide layer were found to affect the ablation resistance of the composites. By forming nano c-HfO2 grains and high-viscosity Al-Si-Y-O glassy phase, the structural stability of the oxide layer was improved, resulting in enhanced ablation resistance. However, the oxidation of Si3N4 led to the formation of NO, NO2, and excessive SiO2 glassy phase, which resulted in a porous structure and reduced the viscosity of the oxide layer. Therefore, the addition of Si3N4 decreased the ablation resistance of the composites.

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY (2024)

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Article Materials Science, Ceramics

Structure characters, and thermal evolution of electrical and elastic behaviors in xBi(Ni1/2Hf1/2)O3-(1-x)PbTiO3 solid solutions with a tetragonal-pseudocubic phase boundary

Yongxing Wei, Huawei Zhang, Siyuan Dong, Changqing Jin, Chenxing Bai, Junle Dai, Zengzhe Xi, Zhonghua Dai, Zengyun Jian, Li Jin

Summary: In this study, solid solutions of xBi(Ni1/2Hf1/2)O-3-(1 - x)PbTiO3 (xBNH-PT) were synthesized to investigate their phase boundary behaviors and physical properties. The presence of a tetragonal-pseudocubic phase boundary and a spontaneous ferroelectric-relaxor transition at specific compositions were confirmed. The introduction of a tetragonal-pseudocubic phase boundary improved the piezoelectric properties and suppressed the spontaneous ferroelectric-relaxor transition.

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY (2024)

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