{"title":"Ta 纤维增强高熵 (Ti0.2Zr0.2Hf0.2Nb0.2Ta0.2)B2-SiC 复合陶瓷的制备与性能","authors":"Qilong Guo, Hao Ying, Bowen Yuan, Hengzhong Fan, Liang Hua, Ronghao Liu, Jing Wang","doi":"10.1016/j.ceramint.2024.09.266","DOIUrl":null,"url":null,"abstract":"<p>High-entropy boride ceramics are expected to be widely used in aerospace, automotive turbines, and armor protection due to their advantages of high melting point, high hardness, adjustable performance, high-temperature stability, and good oxidation resistance. However, it is urgent to solve the problem of low fracture toughness before application. Therefore, in this paper, a single-phase high-purity (Ti<sub>0.2</sub>Zr<sub>0.2</sub>Hf<sub>0.2</sub>Nb<sub>0.2</sub>Ta<sub>0.2</sub>)B<sub>2</sub> powder was prepared by boron/carbon thermal reduction method using a vacuum furnace. The effects of synthesis temperature and C content on the powder were studied. Secondly, HEB ((Ti<sub>0.2</sub>Zr<sub>0.2</sub>Hf<sub>0.2</sub>Nb<sub>0.2</sub>Ta<sub>0.2</sub>)B<sub>2</sub>) powder, SiC powder, and chopped Ta fiber were mixed uniformly, and Ta fiber toughened HEB-SiC composite ceramics were prepared by spark plasma sintering (SPS). The effects of Ta fiber content on the phase composition, microstructure, mechanical properties, and oxidation resistance of the composite ceramics were investigated. The results show that with the increase in synthesis temperature, the HEB powder gradually dissolves, and the solid solution is completely formed at 1700°C. As the C content increases, the oxygen content and particle size of the powder gradually decrease. Single-phase high-entropy (Ti<sub>0.2</sub>Zr<sub>0.2</sub>Hf<sub>0.2</sub>Nb<sub>0.2</sub>Ta<sub>0.2</sub>)B<sub>2</sub> powders with high purity were prepared at 1700°C for 1 h with 6 wt% C content. The addition of C will promote the boron/carbon thermal reduction method, reduce the oxygen content, and inhibit grain growth. With the increase of Ta fiber content, the density of HEB-SiC-Ta<sub>f</sub> composite ceramics increased first and then decreased. The hardness gradually decreased, and the fracture toughness gradually increased. When the Ta fiber content was 7 vol%, the fracture toughness was the highest, reaching 5.12 ± 0.39 MPa·m<sup>1/2</sup>, which was nearly 45% higher than that of the composite ceramics without Ta fiber. This is because of the synergistic toughening mechanism of metal toughening and fiber toughening, such as crack deflection, crack bridging, fiber debonding, and fiber pullout, which improves the fracture toughness of the composite ceramics. With the increase in oxidation temperature, B<sub>2</sub>O<sub>3</sub>, SiO<sub>2</sub>, Ta<sub>2</sub>O<sub>5</sub>, and various metal oxides appear on the surface of HEB-SiC-Ta<sub>f</sub> composite ceramics. The oxidation depth and weight gain per unit area gradually increase. When the Ta fiber content is 5 vol%, the composite ceramics exhibit the best high temperature stability and oxidation resistance. This is due to the Ta<sub>2</sub>O<sub>5</sub> formed by the oxidation of Ta fibers, which dissolves into the B<sub>2</sub>O<sub>3</sub> glass phase, increasing viscosity and improving high temperature stability while reducing the oxygen diffusion rate.</p>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"11 1","pages":""},"PeriodicalIF":5.1000,"publicationDate":"2024-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Preparation and Properties of Ta Fiber Reinforced High-entropy (Ti0.2Zr0.2Hf0.2Nb0.2Ta0.2)B2-SiC Composite Ceramics\",\"authors\":\"Qilong Guo, Hao Ying, Bowen Yuan, Hengzhong Fan, Liang Hua, Ronghao Liu, Jing Wang\",\"doi\":\"10.1016/j.ceramint.2024.09.266\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>High-entropy boride ceramics are expected to be widely used in aerospace, automotive turbines, and armor protection due to their advantages of high melting point, high hardness, adjustable performance, high-temperature stability, and good oxidation resistance. However, it is urgent to solve the problem of low fracture toughness before application. Therefore, in this paper, a single-phase high-purity (Ti<sub>0.2</sub>Zr<sub>0.2</sub>Hf<sub>0.2</sub>Nb<sub>0.2</sub>Ta<sub>0.2</sub>)B<sub>2</sub> powder was prepared by boron/carbon thermal reduction method using a vacuum furnace. The effects of synthesis temperature and C content on the powder were studied. Secondly, HEB ((Ti<sub>0.2</sub>Zr<sub>0.2</sub>Hf<sub>0.2</sub>Nb<sub>0.2</sub>Ta<sub>0.2</sub>)B<sub>2</sub>) powder, SiC powder, and chopped Ta fiber were mixed uniformly, and Ta fiber toughened HEB-SiC composite ceramics were prepared by spark plasma sintering (SPS). The effects of Ta fiber content on the phase composition, microstructure, mechanical properties, and oxidation resistance of the composite ceramics were investigated. The results show that with the increase in synthesis temperature, the HEB powder gradually dissolves, and the solid solution is completely formed at 1700°C. As the C content increases, the oxygen content and particle size of the powder gradually decrease. Single-phase high-entropy (Ti<sub>0.2</sub>Zr<sub>0.2</sub>Hf<sub>0.2</sub>Nb<sub>0.2</sub>Ta<sub>0.2</sub>)B<sub>2</sub> powders with high purity were prepared at 1700°C for 1 h with 6 wt% C content. The addition of C will promote the boron/carbon thermal reduction method, reduce the oxygen content, and inhibit grain growth. With the increase of Ta fiber content, the density of HEB-SiC-Ta<sub>f</sub> composite ceramics increased first and then decreased. The hardness gradually decreased, and the fracture toughness gradually increased. When the Ta fiber content was 7 vol%, the fracture toughness was the highest, reaching 5.12 ± 0.39 MPa·m<sup>1/2</sup>, which was nearly 45% higher than that of the composite ceramics without Ta fiber. This is because of the synergistic toughening mechanism of metal toughening and fiber toughening, such as crack deflection, crack bridging, fiber debonding, and fiber pullout, which improves the fracture toughness of the composite ceramics. With the increase in oxidation temperature, B<sub>2</sub>O<sub>3</sub>, SiO<sub>2</sub>, Ta<sub>2</sub>O<sub>5</sub>, and various metal oxides appear on the surface of HEB-SiC-Ta<sub>f</sub> composite ceramics. The oxidation depth and weight gain per unit area gradually increase. When the Ta fiber content is 5 vol%, the composite ceramics exhibit the best high temperature stability and oxidation resistance. This is due to the Ta<sub>2</sub>O<sub>5</sub> formed by the oxidation of Ta fibers, which dissolves into the B<sub>2</sub>O<sub>3</sub> glass phase, increasing viscosity and improving high temperature stability while reducing the oxygen diffusion rate.</p>\",\"PeriodicalId\":267,\"journal\":{\"name\":\"Ceramics International\",\"volume\":\"11 1\",\"pages\":\"\"},\"PeriodicalIF\":5.1000,\"publicationDate\":\"2024-09-20\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Ceramics International\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://doi.org/10.1016/j.ceramint.2024.09.266\",\"RegionNum\":2,\"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":"Ceramics International","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1016/j.ceramint.2024.09.266","RegionNum":2,"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
摘要
高熵硼化物陶瓷具有高熔点、高硬度、性能可调、高温稳定性和良好的抗氧化性等优点，有望广泛应用于航空航天、汽车涡轮机和装甲防护等领域。然而，在应用之前，迫切需要解决断裂韧性低的问题。因此，本文利用真空炉，采用硼/碳热还原法制备了单相高纯（Ti0.2Zr0.2Hf0.2Nb0.2Ta0.2）B2 粉末。研究了合成温度和碳含量对粉末的影响。其次，将 HEB（(Ti0.2Zr0.2Hf0.2Nb0.2Ta0.2)B2）粉末、SiC 粉末和切碎的 Ta 纤维混合均匀，采用火花等离子烧结法（SPS）制备了 Ta 纤维增韧 HEB-SiC 复合陶瓷。研究了 Ta 纤维含量对复合陶瓷的相组成、微观结构、力学性能和抗氧化性的影响。结果表明，随着合成温度的升高，HEB 粉末逐渐溶解，在 1700°C 时完全形成固溶体。随着 C 含量的增加，粉末的氧含量和粒度逐渐减小。在 1700℃、1 小时、C 含量为 6 wt% 的条件下，制备出了高纯度的单相高熵 (Ti0.2Zr0.2Hf0.2Nb0.2Ta0.2)B2 粉末。C 的加入会促进硼/碳热还原法，降低氧含量，抑制晶粒长大。随着 Ta 纤维含量的增加，HEB-SiC-Taf 复合陶瓷的密度先增大后减小。硬度逐渐降低，断裂韧性逐渐增加。当 Ta 纤维含量为 7 vol% 时，断裂韧性最高，达到 5.12 ± 0.39 MPa-m1/2，比不添加 Ta 纤维的复合陶瓷高出近 45%。这是因为金属增韧和纤维增韧的协同增韧机理，如裂纹偏转、裂纹架桥、纤维脱粘和纤维拔出等，提高了复合陶瓷的断裂韧性。随着氧化温度的升高，HEB-SiC-Taf 复合陶瓷表面会出现 B2O3、SiO2、Ta2O5 和各种金属氧化物。氧化深度和单位面积增重逐渐增加。当 Ta 纤维含量为 5 vol% 时，复合陶瓷表现出最佳的高温稳定性和抗氧化性。这是由于 Ta 纤维氧化形成的 Ta2O5 溶解到 B2O3 玻璃相中，增加了粘度，提高了高温稳定性，同时降低了氧扩散率。
Preparation and Properties of Ta Fiber Reinforced High-entropy (Ti0.2Zr0.2Hf0.2Nb0.2Ta0.2)B2-SiC Composite Ceramics
High-entropy boride ceramics are expected to be widely used in aerospace, automotive turbines, and armor protection due to their advantages of high melting point, high hardness, adjustable performance, high-temperature stability, and good oxidation resistance. However, it is urgent to solve the problem of low fracture toughness before application. Therefore, in this paper, a single-phase high-purity (Ti0.2Zr0.2Hf0.2Nb0.2Ta0.2)B2 powder was prepared by boron/carbon thermal reduction method using a vacuum furnace. The effects of synthesis temperature and C content on the powder were studied. Secondly, HEB ((Ti0.2Zr0.2Hf0.2Nb0.2Ta0.2)B2) powder, SiC powder, and chopped Ta fiber were mixed uniformly, and Ta fiber toughened HEB-SiC composite ceramics were prepared by spark plasma sintering (SPS). The effects of Ta fiber content on the phase composition, microstructure, mechanical properties, and oxidation resistance of the composite ceramics were investigated. The results show that with the increase in synthesis temperature, the HEB powder gradually dissolves, and the solid solution is completely formed at 1700°C. As the C content increases, the oxygen content and particle size of the powder gradually decrease. Single-phase high-entropy (Ti0.2Zr0.2Hf0.2Nb0.2Ta0.2)B2 powders with high purity were prepared at 1700°C for 1 h with 6 wt% C content. The addition of C will promote the boron/carbon thermal reduction method, reduce the oxygen content, and inhibit grain growth. With the increase of Ta fiber content, the density of HEB-SiC-Taf composite ceramics increased first and then decreased. The hardness gradually decreased, and the fracture toughness gradually increased. When the Ta fiber content was 7 vol%, the fracture toughness was the highest, reaching 5.12 ± 0.39 MPa·m1/2, which was nearly 45% higher than that of the composite ceramics without Ta fiber. This is because of the synergistic toughening mechanism of metal toughening and fiber toughening, such as crack deflection, crack bridging, fiber debonding, and fiber pullout, which improves the fracture toughness of the composite ceramics. With the increase in oxidation temperature, B2O3, SiO2, Ta2O5, and various metal oxides appear on the surface of HEB-SiC-Taf composite ceramics. The oxidation depth and weight gain per unit area gradually increase. When the Ta fiber content is 5 vol%, the composite ceramics exhibit the best high temperature stability and oxidation resistance. This is due to the Ta2O5 formed by the oxidation of Ta fibers, which dissolves into the B2O3 glass phase, increasing viscosity and improving high temperature stability while reducing the oxygen diffusion rate.
期刊介绍：
Ceramics International covers the science of advanced ceramic materials. The journal encourages contributions that demonstrate how an understanding of the basic chemical and physical phenomena may direct materials design and stimulate ideas for new or improved processing techniques, in order to obtain materials with desired structural features and properties.
Ceramics International covers oxide and non-oxide ceramics, functional glasses, glass ceramics, amorphous inorganic non-metallic materials (and their combinations with metal and organic materials), in the form of particulates, dense or porous bodies, thin/thick films and laminated, graded and composite structures. Process related topics such as ceramic-ceramic joints or joining ceramics with dissimilar materials, as well as surface finishing and conditioning are also covered. Besides traditional processing techniques, manufacturing routes of interest include innovative procedures benefiting from externally applied stresses, electromagnetic fields and energetic beams, as well as top-down and self-assembly nanotechnology approaches. In addition, the journal welcomes submissions on bio-inspired and bio-enabled materials designs, experimentally validated multi scale modelling and simulation for materials design, and the use of the most advanced chemical and physical characterization techniques of structure, properties and behaviour.
Technologically relevant low-dimensional systems are a particular focus of Ceramics International. These include 0, 1 and 2-D nanomaterials (also covering CNTs, graphene and related materials, and diamond-like carbons), their nanocomposites, as well as nano-hybrids and hierarchical multifunctional nanostructures that might integrate molecular, biological and electronic components.
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