Reactive sintered dense carbon fiber reinforced high-entropy boride composite using high-entropy silicide as reactant

IF 3.5 3区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS
Feilong Huang, Hailong Wang, Cheng Fang, Jiayin Zhao, Kaize Zheng, Bo Song, Wei Xie, Mingliang Li, Hongxia Lu
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引用次数: 0

Abstract

A novel reactive sintering strategy using high-entropy disilicide, B4C, and carbon as initial materials is developed to fabricate dense carbon fiber reinforced high-entropy diboride (HEB)-based composite (Cf/HEBs) at a relatively low temperature. The Cf/(V0.2Nb0.2Cr0.2Mo0.2W0.2)B2–SiC composite (Cf/HEB–SiC) successfully achieves nearly full densification (with a relative density of 99.2%) at 1800°C. The reactive damage of carbon fibers can be effectively restrained by preassemble carbon coating during the preparation process of the composite. Lower preparation temperature and effective coating protection contribute to the exertion of carbon fibers toughening capacity, consequently noticeably elevating the critical crack size (αcr) from 27.7 µm for HEB–SiC to 110.4 µm for Cf/HEB–SiC. The current work provides a feasible way to substantially upgrade the damage tolerance of HEB–SiC and can be extended to other HEBs-based ceramics.

Abstract Image

以高熵硅化物为原料,烧结致密碳纤维增强高熵硼化物复合材料
采用高熵二硅化物、B4C和碳作为初始材料,在较低温度下制备了致密碳纤维增强高熵二硼化物(HEB)基复合材料(Cf/HEBs)。Cf/(V0.2Nb0.2Cr0.2Mo0.2W0.2) B2-SiC复合材料(Cf/ HEB-SiC)在1800℃下成功地实现了近乎完全致密化(相对密度为99.2%)。在复合材料制备过程中,采用预组装碳涂层可以有效地抑制碳纤维的反应性损伤。较低的制备温度和有效的涂层保护有助于发挥碳纤维的增韧能力,从而使临界裂纹尺寸(αcr)从HEB-SiC的27.7µm显著提高到Cf/ HEB-SiC的110.4µm。本研究为大幅度提高HEB-SiC的损伤容限提供了一条可行的途径,并可推广到其他hebs基陶瓷。
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来源期刊
Journal of the American Ceramic Society
Journal of the American Ceramic Society 工程技术-材料科学:硅酸盐
CiteScore
7.50
自引率
7.70%
发文量
590
审稿时长
2.1 months
期刊介绍: The Journal of the American Ceramic Society contains records of original research that provide insight into or describe the science of ceramic and glass materials and composites based on ceramics and glasses. These papers include reports on discovery, characterization, and analysis of new inorganic, non-metallic materials; synthesis methods; phase relationships; processing approaches; microstructure-property relationships; and functionalities. Of great interest are works that support understanding founded on fundamental principles using experimental, theoretical, or computational methods or combinations of those approaches. All the published papers must be of enduring value and relevant to the science of ceramics and glasses or composites based on those materials. Papers on fundamental ceramic and glass science are welcome including those in the following areas: Enabling materials for grand challenges[...] Materials design, selection, synthesis and processing methods[...] Characterization of compositions, structures, defects, and properties along with new methods [...] Mechanisms, Theory, Modeling, and Simulation[...] JACerS accepts submissions of full-length Articles reporting original research, in-depth Feature Articles, Reviews of the state-of-the-art with compelling analysis, and Rapid Communications which are short papers with sufficient novelty or impact to justify swift publication.
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