Densification, microstructure, mechanical, and thermionic properties of spark plasma sintered LaB6–HfB2 composite

IF 1.8 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

International Journal of Applied Ceramic Technology Pub Date : 2024-07-15 DOI:10.1111/ijac.14862

Ke Wang, Xinyu Yang, Wei Zhao, Zengjie Gu, Shifeng Luo, Jiuxing Zhang

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引用次数: 0

Abstract

LaB₆–HfB₂ composites with the different HfB₂ contents (10 wt.%, 30 wt.%, 50 wt.%, 70 wt.%, and 90 wt.%) were densified by spark plasma sintering (SPS). Results showed that the densification mechanism of the composite transformed from the grain boundary diffusion into the dislocation climbing mechanism as the holding time was extended from 0 to 15 min under temperature range of 1750–1900°C. The HfB₂ phase could effectively limit the grain growth of LaB₆ phase, and the dynamic growth of the grain was governed by grain boundary diffusion. Both the Berkovich hardness and Vickers hardness obeyed the normal indentation size effect. LaB₆–70 wt.% HfB₂ composite had the highest fracture toughness of 3.98 ± .43 MPa m^.5, whereas the highest current density of 18.34 A/cm² belonged to LaB₆–30 wt.% HfB₂ composite. All the results demonstrated that LaB₆–HfB₂ composite was a promising material with the excellent structural and functional performance.

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火花等离子烧结 LaB6-HfB2 复合材料的致密化、微观结构、机械和热电特性

通过火花等离子烧结（SPS）对不同 HfB2 含量（10 wt.%、30 wt.%、50 wt.%、70 wt.% 和 90 wt.%）的 LaB6-HfB2 复合材料进行了致密化。结果表明，在 1750-1900°C 的温度范围内，随着保温时间从 0 分钟延长到 15 分钟，复合材料的致密化机制从晶界扩散转变为位错攀升机制。HfB2 相能有效限制 LaB6 相的晶粒生长，晶粒的动态生长受晶界扩散的支配。Berkovich 硬度和维氏硬度都服从正常压痕尺寸效应。LaB6-70 wt.% HfB2 复合材料的断裂韧性最高，为 3.98 ± .43 MPa m.5，而 LaB6-30 wt.% HfB2 复合材料的电流密度最高，为 18.34 A/cm2 。所有结果都表明，LaB6-HfB2 复合材料是一种很有前途的材料，具有优异的结构和功能性能。

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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;