Introducing a thermally stable rGO/SiCxOy composite phase into SiC fibers enhances their high-temperature resistance.

Source: Yisibang

Continuous silicon carbide fiber ( SiC fiber ) and its enhanced ceramic matrix composites ( CMC ), owing to its outstanding high-temperature resistance, oxidation resistance, and mechanical properties, has demonstrated extremely broad application prospects in extreme-environment fields such as aerospace and the nuclear industry. However, Silicon carbide Fibers face a severe challenge in high-temperature environments. : in the fiber Silicon carbide _x O _y The amorphous phase undergoes vigorous decomposition at elevated temperatures, accompanied by the release of substantial amounts of gas. This process severely disrupts the fiber’s microstructure, leading to a marked reduction in mechanical properties and thereby limiting… Silicon carbide The high-temperature resistance of fibers. Currently, high-performance… Silicon carbide The mainstream research direction in fiber science focuses on reducing the oxygen content in fibers to achieve… Yes and C Near-stoichiometric. This strategy aims to reduce or eliminate, at the source, those species that are prone to decomposition at high temperatures. Silicon carbide _x O _y amorphous phase, thereby significantly enhancing the fiber’s thermal stability and mechanical properties. However, in industrial production, reducing… Silicon carbide Fiber oxygen content still faces numerous complex process challenges. This study takes a novel approach by proposing a method to stabilize graphene through… SiCxOy A new strategy for the amorphous phase, aimed at enhancing… Silicon carbide The high-temperature resistance of fibers offers a new approach. 。

Recently, The Ceramic Fiber Team of the National University of Defense Technology In the journal “ Carbon 》, the latest research findings were published. “ Embedding thermostable rGO/SiCxOy composite phase in SiC fibers for improved high temperature resistance ” . The National University of Defense Technology is the sole affiliated institution, and the first author of the paper is from the School of Aerospace Science. New-type ceramic fibers and their composite materials ( CFC ) Laboratory PhD student Liu Tao ， The corresponding authors are Professor Wang Yingde and Associate Researcher Han Cheng. Researchers have employed a precursor‑conversion method to produce highly thermally stable reduced graphene oxide. / Silicon-carbon-oxygen ( rGO/SiC _x O _y ) Uniform embedding of composite phases Silicon carbide In the fibers, oxygen-containing high-temperature-resistant materials were prepared. rGO/SiC Composite fiber, rGO The introduction of collaboration has improved Silicon carbide The mechanical properties and high-temperature resistance of the fibers enable the preparation of low-cost, high-performance materials. Silicon carbide Fibers offer new viable solutions.

Figure 1：rGO/SiC Schematic diagram of the preparation process for composite fibers.

Compared to the unadded rGO of Silicon carbide Fiber, 0.5%-rGO/SiC and 1%-rGO/SiC The tensile strength of the composite fiber was improved by, respectively, 40% and 21% (Image) 2 ). The excellent mechanical properties are attributed to the fiber preparation process. v-GO/PCS Hybrid precursor rearrangement has resulted in rGO/SiC _x O _y The composite phase reduces organic matter. - Pore formation during the inorganic conversion process, followed by melt spinning. rGO Within the fiber, alignment along the fiber axis induces further orientation of the pores (Fig. 3 ). In addition, during high-temperature heat treatment, in the composite fibers... rGO/SiC _x O _y The composite phase maintains relative stability (Fig. 4 ). With rGO As the content increases, the active oxidation of the composite fibers during heat treatment in an argon atmosphere is significantly suppressed. 1%-rGO/SiC Composite fibers, after undergoing 1600℃ The structure remains smooth and dense after heat treatment (Fig. 5 ), and in 1700℃ No pulverization occurred after heat treatment. Therefore, the use of… rGO Stability Silicon carbide In the fiber Silicon carbide _x O _y The amorphous phase can enhance high oxygen content. Silicon carbide The high-temperature resistance of the fibers, thereby holding promise for reducing high-performance… Silicon carbide The cost of fiber production.

Figure 2 : After heat treatment at different temperatures rGO/SiC Changes in the mechanical properties of composite fibers.

Figure 3：rGO/SiC Pore evolution during the preparation of composite fibers.

Figure 4：rGO/SiC Schematic diagram of the high-temperature resistance mechanism of composite fibers.

Figure 5： 1600℃ Before and after heat treatment rGO/SiC of composite fiber SEM Figure.

Paper link:

https://doi.org/10.1016/j.carbon.2024.119858

Character Profile:

Wang Yingde is a professor and doctoral supervisor at the Key Laboratory of Novel Ceramic Fibers and Their Composites, School of Aerospace Science, National University of Defense Technology. He is also affiliated with the University of British Columbia in Canada. UBC ) Visiting Professor ( 2009.9–2010.9 ). Currently (or formerly) a member of the Space Debris Protection Technical Expert Group of the National Defense Science and Technology Industry Bureau, a director of the Chinese Society for Space Sciences and deputy chair of its Space Materials Professional Committee, vice chairman of the Engineering Ceramics Council of the Chinese Mechanical Engineering Society, and an editorial board member of the journals Journal of Inorganic Materials and Functional Materials. He has presided over projects including those funded by the National Natural Science Foundation, “863” Research projects, including national-level initiatives such as the Basic Strengthening Program, fundamental research, defense-related basic scientific research, pre‑research on weapons and equipment, and a special program on space debris. 30 Remaining items. Awarded the Second Prize of the National Science and Technology Progress Award. 1 Item: First Prize for Scientific and Technological Progress at the military and ministerial levels 3 Item: Awarded the First Hunan Province Outstanding Graduate Supervisor Award. In Adv. Mater. 、 Adv. Funct. Mater. 、 Adv. Sci. 、 J. Adv. Cream. To be published in a journal SCI Paper 203 Chapter, he cites >4700 Next, H Factor 36 , granted a national invention patent 20 Remaining items.

Han Cheng is an associate researcher at the Key Laboratory of Novel Ceramic Fibers and Their Composites, School of Aerospace Science, National University of Defense Technology, and a master’s supervisor. He has been selected for the China Association for Science and Technology’s Young Talent Support Program and serves as a member of the Thermal Protection Composites Division of the Chinese Society for Composite Materials. He has long been engaged in research on high-performance ceramic fibers and precursor materials, and has led projects funded by the National Natural Science Foundation, pre‑research programs for military equipment, and development programs supporting specific model projects. 10 Other items: participated in projects such as the special program for import substitution of critical materials and key research under the Basic Strengthening Plan, and published… SCI Paper 50 Chapter, he cites >1800 Next, H Factor 23 . As first or corresponding author in Nano Research ( Top Papers Award ), Carbon 、 J. Am. Ceram. Soc. 、 J. Eur. Ceram. Soc. To be published in a journal SCI Paper 18 Article, with the highest number of citations for a single article >500 Next ( ESI Previous 1% Highly cited; filed for a national invention patent. 20 Remaining items (authorized) 10 Item).