{"title":"Toward a low-temperature sintering of carbon fiber toughened high entropy boride composite with Co addition","authors":"Feilong Huang, Hailong Wang, Cheng Fang, Mingliang Li, Wei Xie, Zhangfan Hu, Hailiang Wang, Yongqiang Chen, Gang Shao","doi":"10.1111/ijac.14943","DOIUrl":null,"url":null,"abstract":"<p>Dense C<sub>f</sub>/(ZrHfNbTaCr)B<sub>2</sub>–SiC (CBS-Co) composite is successfully prepared at a low temperature of 1500°C by adding 5 vol.% Co. Liquid Co accelerates the particle rearrangement and significantly enhances the relative density of CBS-Co (95.2%). In situ formed Co<sub>2</sub>B phase by diffusion reaction bonds tightly with high entropy diboride (HEB) and SiC grains in CBS-Co. Due to the promotion of relative density and interfacial bonding strength, CBS-Co exhibits a high flexural strength (283 ± 23 MPa). Structural damages of carbon fibers are effectively prevented by compact fiber coating. The well-preserved fibers play dominant roles to increase the fracture toughness of CBS-Co (4.77 ± .5 MPa·m<sup>1/2</sup>). Moreover, SiO<sub>2</sub>-rich oxide layer can effectively heal flaws and inhibit oxygen diffusion, achieving relatively high flexural strength after oxidation at 1300°C of CBS-Co composite. This work provides a stepping stone for developing high-performance carbon fiber toughened HEB composites based on low temperature liquid-phase sintering technology.</p>","PeriodicalId":13903,"journal":{"name":"International Journal of Applied Ceramic Technology","volume":"22 1","pages":""},"PeriodicalIF":1.8000,"publicationDate":"2024-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Journal of Applied Ceramic Technology","FirstCategoryId":"88","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1111/ijac.14943","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"MATERIALS SCIENCE, CERAMICS","Score":null,"Total":0}
引用次数: 0
Abstract
Dense Cf/(ZrHfNbTaCr)B2–SiC (CBS-Co) composite is successfully prepared at a low temperature of 1500°C by adding 5 vol.% Co. Liquid Co accelerates the particle rearrangement and significantly enhances the relative density of CBS-Co (95.2%). In situ formed Co2B phase by diffusion reaction bonds tightly with high entropy diboride (HEB) and SiC grains in CBS-Co. Due to the promotion of relative density and interfacial bonding strength, CBS-Co exhibits a high flexural strength (283 ± 23 MPa). Structural damages of carbon fibers are effectively prevented by compact fiber coating. The well-preserved fibers play dominant roles to increase the fracture toughness of CBS-Co (4.77 ± .5 MPa·m1/2). Moreover, SiO2-rich oxide layer can effectively heal flaws and inhibit oxygen diffusion, achieving relatively high flexural strength after oxidation at 1300°C of CBS-Co composite. This work provides a stepping stone for developing high-performance carbon fiber toughened HEB composites based on low temperature liquid-phase sintering technology.
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;
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