Effects of boron content on the microstructure and properties of B x C-TiB2 (x=4.5, 6.5 or 8.5) ceramic composites by the reactive spark plasma sintering

IF 4.5 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

International Journal of Smart and Nano Materials Pub Date : 2022-01-02 DOI:10.1080/19475411.2022.2042423

Yafei Pan, Lei Huang, Jiuxing Zhang, Yong Du, F. Luo

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Abstract

ABSTRACT B x C-TiB2 ceramic composites were fabricated via reactive spark plasma sintering using TiC and B as the raw materials. The impact of B/TiC mole ratios on the phase compositions, densification behaviors, microstructure, and mechanical properties of the ceramic composites were investigated. The results showed that the stoichiometry of ‘B x C’ could be tailored by changing initial boron content and the obtained B4.5C, B6.5C and B8.5C phases have the same crystal structure (R-3 m). The excess of B enhanced the reaction between TiC and B, which released a large amount of hot energy and promoted the densification of the composites. The TB8.5 composite sintered at 1900°C had the best comprehensive mechanical properties, with hardness and flexural strength of 40.36 GPa and 551 MPa, respectively. The formation of nano-sized TiB2 grains induced by reaction were beneficial for improving the mechanical properties of these composites. Graphical abstract

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硼含量对B x C-TiB2 (x=4.5, 6.5或8.5)陶瓷复合材料显微组织和性能的影响

摘要以TiC和B为原料，采用反应火花等离子烧结法制备了B×C-TiB2陶瓷复合材料。研究了B/TiC摩尔比对陶瓷复合材料相组成、致密化行为、微观结构和力学性能的影响。结果表明，可以通过改变初始硼含量来调整“B x C”的化学计量，得到的B4.5C、B6.5C和B8.5C相具有相同的晶体结构（R-3m）。过量的B增强了TiC和B之间的反应，释放了大量的热能，促进了复合材料的致密化。在1900°C下烧结的TB8.5复合材料具有最佳的综合力学性能，硬度和弯曲强度分别为40.36GPa和551MPa。反应诱导纳米TiB2晶粒的形成有利于提高复合材料的力学性能。图形摘要

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来源期刊

International Journal of Smart and Nano Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

6.30

自引率

5.10%

发文量

审稿时长

11 weeks

期刊介绍： The central aim of International Journal of Smart and Nano Materials is to publish original results, critical reviews, technical discussion, and book reviews related to this compelling research field: smart and nano materials, and their applications. The papers published in this journal will provide cutting edge information and instructive research guidance, encouraging more scientists to make their contribution to this dynamic research field.