{"title":"反应热压法制造的 TaxHf1-xC-SiC 的微观结构和力学行为:Ta:Hf比例的影响","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":"{\"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}","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}
Microstructure and mechanical behavior of TaxHf1−xC–SiC fabricated by reactive hot-pressing: Effect of Ta:Hf ratio
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.
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