{"title":"Microstructure and mechanical behavior of TaxHf1−xC–SiC fabricated by reactive hot-pressing: Effect of Ta:Hf ratio","authors":"Dewei Ni, Yanyan Qin, Shaoming Dong","doi":"10.1111/jace.19977","DOIUrl":null,"url":null,"abstract":"<p>Ta<i><sub>x</sub></i>Hf<sub>1–</sub><i><sub>x</sub></i>C are promising candidates for many applications under harsh environments due to their unique properties. Up until now, low-temperature densification is still a big challenge for these ceramics. Moreover, the effect of Ta:Hf ratio on microstructure development and mechanical behavior of the ceramics is not clear. In this work, highly dense Ta<i><sub>x</sub></i>Hf<sub>1−</sub><i><sub>x</sub></i>C–SiC ceramics (<i>x</i> = 0.2, 0.4, 0.6, 0.8) were fabricated at 1700°C by a novel reactive hot-pressing processing with 8 wt% Si as sintering aid, which present excellent mechanical properties. Fracture toughness of the ceramics is higher than 6.3 MPa·m<sup>1/2</sup>, with the highest toughness achieved in Ta<sub>0.6</sub>Hf<sub>0.4</sub>C–SiC (8.5 MPa·m<sup>1/2</sup>). With the increase of Ta content, hardness of the ceramics tends to increase, while the bending strength tends to decrease. The highest bending strength is achieved in Ta<sub>0.2</sub>Hf<sub>0.8</sub>C–SiC (637 MPa), and the highest hardness is achieved in Ta<sub>0.8</sub>Hf<sub>0.2</sub>C–SiC (17.6 GPa). This work lays the foundation for the composition design of Ta<i><sub>x</sub></i>Hf<sub>1−</sub><i><sub>x</sub></i>C-based ceramics and composites.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":null,"pages":null},"PeriodicalIF":3.5000,"publicationDate":"2024-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of the American Ceramic Society","FirstCategoryId":"88","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1111/jace.19977","RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, CERAMICS","Score":null,"Total":0}
引用次数: 0
Abstract
TaxHf1–xC are promising candidates for many applications under harsh environments due to their unique properties. Up until now, low-temperature densification is still a big challenge for these ceramics. Moreover, the effect of Ta:Hf ratio on microstructure development and mechanical behavior of the ceramics is not clear. In this work, highly dense TaxHf1−xC–SiC ceramics (x = 0.2, 0.4, 0.6, 0.8) were fabricated at 1700°C by a novel reactive hot-pressing processing with 8 wt% Si as sintering aid, which present excellent mechanical properties. Fracture toughness of the ceramics is higher than 6.3 MPa·m1/2, with the highest toughness achieved in Ta0.6Hf0.4C–SiC (8.5 MPa·m1/2). With the increase of Ta content, hardness of the ceramics tends to increase, while the bending strength tends to decrease. The highest bending strength is achieved in Ta0.2Hf0.8C–SiC (637 MPa), and the highest hardness is achieved in Ta0.8Hf0.2C–SiC (17.6 GPa). This work lays the foundation for the composition design of TaxHf1−xC-based ceramics and composites.
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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