Synthesis of sub-micron sized SiC particles with high defect density by using polytetrafluoroethylene as an additive

IF 1.8 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS International Journal of Applied Ceramic Technology Pub Date : 2024-06-28 DOI:10.1111/ijac.14847

Yun Xing, Bo Ren, Bin Li, Junhong Chen, Shu Yin, Huan Lin, Yuanhui Liu

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Abstract

A new preparation process for silicon carbide (SiC) powder is developed. In the Si–(C) –PTFE–Ar system, the grain size and morphology of the product 3C–SiC were controlled by adding a carbon source (graphite) and changing the percentage of polytetrafluoroethylene (PTFE) (0%, 10%, and 20%). The experimental results showed that the SiC powders prepared using a molar ratio of 1:1 silicon powder to graphite, plus 20% PTFE have a uniform particle size distribution (∼130 nm), a lamellar structure made of spherical particle stacking, a small bandgap (1.80 eV), a high carrier concentration, and a large number of lattice defects. These properties are expected to increase the electrical conductivity of 3C–SiC and decrease its thermal conductivity, thus providing a promising feedstock preparation option for SiC thermoelectric materials. In addition, the mechanism of PTFE in the preparation of SiC reactions was studied in detail.

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使用聚四氟乙烯作为添加剂合成具有高缺陷密度的亚微米级碳化硅颗粒

开发了一种新的碳化硅（SiC）粉末制备工艺。在 Si-(C) -PTFE-Ar 体系中，通过添加碳源（石墨）和改变聚四氟乙烯（PTFE）的比例（0%、10% 和 20%）来控制产物 3C-SiC 的粒度和形态。实验结果表明，硅粉与石墨的摩尔比为 1:1，再加上 20% 的聚四氟乙烯制备的 SiC 粉末具有均匀的粒度分布（130 nm）、由球形颗粒堆积而成的片状结构、较小的带隙（1.80 eV）、较高的载流子浓度以及大量的晶格缺陷。这些特性有望提高 3C-SiC 的电导率，降低其热导率，从而为 SiC 热电材料的原料制备提供一种前景广阔的选择。此外，还详细研究了 PTFE 在制备 SiC 反应中的作用机理。

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来源期刊

International Journal of Applied Ceramic Technology 工程技术-材料科学：硅酸盐

CiteScore

3.90

自引率

9.50%

发文量

280

审稿时长

4.5 months

期刊介绍： The International Journal of Applied Ceramic Technology publishes cutting edge applied research and development work focused on commercialization of engineered ceramics, products and processes. The publication also explores the barriers to commercialization, design and testing, environmental health issues, international standardization activities, databases, and cost models. Designed to get high quality information to end-users quickly, the peer process is led by an editorial board of experts from industry, government, and universities. Each issue focuses on a high-interest, high-impact topic plus includes a range of papers detailing applications of ceramics. Papers on all aspects of applied ceramics are welcome including those in the following areas: Nanotechnology applications; Ceramic Armor; Ceramic and Technology for Energy Applications (e.g., Fuel Cells, Batteries, Solar, Thermoelectric, and HT Superconductors); Ceramic Matrix Composites; Functional Materials; Thermal and Environmental Barrier Coatings; Bioceramic Applications; Green Manufacturing; Ceramic Processing; Glass Technology; Fiber optics; Ceramics in Environmental Applications; Ceramics in Electronic, Photonic and Magnetic Applications;