再结晶SiC的微观结构、电学、热学和渗透性能：亚微米尺寸SiC和烧结温度的影响

IF 5.6 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International Pub Date : 2025-07-01 DOI:10.1016/j.ceramint.2025.03.195

Muhammad Shoaib Anwar, Hong Joo Lee, Jang-Hoon Ha, Jongman Lee, In-Hyuck Song

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引用次数: 0

摘要

将粗晶（4.5 μm）和亚微米级（0.55 μm） SiC在氩气气氛下，添加2 wt% B4C，进行无压烧结制备多孔SiC再结晶。研究了添加亚微米级SiC （0-20 wt%）和烧结温度（2150-2250°C）对合金微观结构、电阻率、导热系数、机械强度和渗透率的影响。亚微米SiC可以有效地改善颗粒的界面结合，使SiC的相变变为6h→4h。电学和热学性能取决于微观结构方面，如SiC多型、晶粒尺寸、孔径和颗粒界面，这些由烧结温度和亚微米级SiC含量控制。样品中0.55 μm SiC质量分数为15wt %，在2200℃下烧结，其电阻率为4.2 × 105 Ω cm，导热系数为45 W/m。K，孔径为3.4 μm，孔隙率为44%，抗折强度为39 MPa，稳定的纯水渗透率约为3100 LMH/bar。

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Microstructure, electrical, thermal, and permeability properties of recrystallised SiC: Effects of sub-micron-sized SiC and sintering temperature

Recrystallised porous SiC was fabricated via pressureless sintering of the mixture of coarse (4.5 μm) and submicron-sized (0.55 μm) SiC under an Ar atmosphere with the aid of 2 wt% B₄C. The effects of adding submicron-sized SiC (0–20 wt%) and a variation of the sintering temperature (2150–2250 °C) on the microstructure, electrical resistivity, thermal conductivity, mechanical strength, and permeability were evaluated. Submicron-sized SiC could effectively improve the interface bonding of particles and cause 6 H→4 H SiC phase transformation. The electrical and thermal properties were found to be dependent on microstructural aspects such as the SiC polytype, grain size, pore size, and particle interface, which were controlled by the sintering temperature and submicron-sized SiC content. Samples with 15 wt% of 0.55 μm SiC sintered at 2200 °C resulted in an electrical resistivity of 4.2 × 10⁵ Ω cm, a thermal conductivity of 45 W/m. K, a pore size of 3.4 μm, a porosity of 44 %, a flexural strength of 39 MPa, and a stable pure water permeability of approximately 3100 LMH/bar.

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来源期刊

Ceramics International 工程技术-材料科学：硅酸盐

CiteScore

9.40

自引率

15.40%

发文量

4558

审稿时长

25 days

期刊介绍： Ceramics International covers the science of advanced ceramic materials. The journal encourages contributions that demonstrate how an understanding of the basic chemical and physical phenomena may direct materials design and stimulate ideas for new or improved processing techniques, in order to obtain materials with desired structural features and properties. Ceramics International covers oxide and non-oxide ceramics, functional glasses, glass ceramics, amorphous inorganic non-metallic materials (and their combinations with metal and organic materials), in the form of particulates, dense or porous bodies, thin/thick films and laminated, graded and composite structures. Process related topics such as ceramic-ceramic joints or joining ceramics with dissimilar materials, as well as surface finishing and conditioning are also covered. Besides traditional processing techniques, manufacturing routes of interest include innovative procedures benefiting from externally applied stresses, electromagnetic fields and energetic beams, as well as top-down and self-assembly nanotechnology approaches. In addition, the journal welcomes submissions on bio-inspired and bio-enabled materials designs, experimentally validated multi scale modelling and simulation for materials design, and the use of the most advanced chemical and physical characterization techniques of structure, properties and behaviour. Technologically relevant low-dimensional systems are a particular focus of Ceramics International. These include 0, 1 and 2-D nanomaterials (also covering CNTs, graphene and related materials, and diamond-like carbons), their nanocomposites, as well as nano-hybrids and hierarchical multifunctional nanostructures that might integrate molecular, biological and electronic components.