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| 1 | High-entropy ceramics:Present status,challenges,and a look forward显示文摘High-entropy ceramics (HECs) are solid solutions of inorganic compounds with one or more Wyckoff sites shared by equal or near-equal atomic ratios of multi-principal elements.Although in the infant stage,the emerging of this new family of materials has brought new opportunities for material design and property tailoring.Distinct from metals,the diversity in crystal structure and electronic structure of ceramics provides huge space for properties tuning through band structure engineering and phonon engineering.Aside from strengthening,hardening,and low thermal conductivity that have already been found in high-entropy alloys,new properties like colossal dielectric constant,super ionic conductivity,severe anisotropic thermal expansion coefficient,strong electromagnetic wave absorption,etc.,have been discovered in HECs.As a response to the rapid development in this nascent field,this article gives a comprehensive review on the structure features,theoretical methods for stability and property prediction,processing routes,novel properties,and prospective applications of HECs.The challenges on processing,characterization,and property predictions are also emphasized.Finally,future directions for new material exploration,novel processing,fundamental understanding,in-depth characterization,and database assessments are given. | Huimin XIANG Yan XING Fu-zhi DAI Hongjie WANG Lei SU Lei MIAO Guojun ZHANG Yiguang WANG Xiwei QI Lei YAO Hailong WANG Biao ZHAO Jianqiang LI Yanchun ZHOU | 2021 | Journal of Advanced Ceramics2021，10，3： | 28 |
| 2 | 高熵热障涂层陶瓷材料研究进展显示文摘随着军事和科技的发展,热障涂层应用技术已成为现代国防尖端技术中最重要的技术之一。而高熵热障涂层陶瓷材料具有高温相稳定性、超低热导率、耐腐蚀性强、热膨胀系数和断裂韧性较高等优点,可为高温合金基底提供良好的热防护,在航空航天、航海和核能等领域有重要的应用前景。对国内外已报道的高熵热障涂层陶瓷候选材料进行系统性分类总结,重点介绍了新型高熵热障涂层陶瓷材料的设计方法、结构类型及其性能特征,为高熵陶瓷在热障涂层材料领域的发展和应用思路。 | 罗学维 徐春辉 段帅帅 黄烁 靳洪允 | 2022 | 航空制造技术2022，65，3： | 10 |
| 3 | Achieving ultra-broadband electromagnetic wave absorption in high-entropy transition metal carbides (HE TMCs)显示文摘Electronic devices pervade everyday life,which has triggered severe electromagnetic(EM)wave pollution.To face this challenge,developing EM wave absorbers with ultra-broadband absorption capacity is critically required.Currently,nano-composite construction has been widely utilized to realize impedance match and broadband absorption.However,complex experimental procedures,limited thermal stability,and interior oxidation resistance are still unneglectable issues.Therefore,it is appealing to realize ultra-broadband EM wave absorption in single-phase materials with good stability.Aiming at this target,two high-entropy transition metal carbides(HE TMCs)including(Zr,Hf,Nb,Ta)C(HE TMC-2)and(Cr,Zr,Hf,Nb,Ta)C(HE TMC-3)are designed and synthesized,of which the microwave absorption performance is investigated in comparison with previously reported(Ti,Zr,Hf,Nb,Ta)C(HE TMC-1).Due to the synergistic effects of dielectric and magnetic losses,HE TMC-2 and HE TMC-3 exhibit better impedance match and wider effective absorption bandwidth(EAB).In specific,the exclusion of Ti element in HE TMC-2 endows it optimal minimum reflection loss(RL_(min))and EAB of−41.7 dB(2.11 mm,10.52 GHz)and 3.5 GHz(at 3.0 mm),respectively.Remarkably,the incorporation of Cr element in HE TMC-3 significantly improves the impedance match,thus realizing EAB of 10.5,9.2,and 13.9 GHz at 2,3,and 4 mm,respectively.The significance of this study lays on realizing ultra-broadband capacity in HE TMC-3(Cr,Zr,Hf,Nb,Ta),demonstrating the effectiveness of high-entropy component design in tailoring the impedance match. | Weiming ZHANG Huimin XIANG Fu-Zhi DAI Biao ZHAO Shijiang WU Yanchun ZHOU | 2022 | Journal of Advanced Ceramics2022，11，4： | 5 |
| 4 | Enabling highly efficient and broadband electromagnetic wave absorption by tuning impedance match in high-entropy transition metal diborides (HETMB_(2))显示文摘The advance in communication technology has triggered worldwide concern on electromagnetic wave pollution.To cope with this challenge,exploring high-performance electromagnetic(EM)wave absorbing materials with dielectric and magnetic losses coupling is urgently required.Of the EM wave absorbers,transition metal diborides(TMB2)possess excellent dielectric loss capability.However,akin to other single dielectric materials,poor impedance match leads to inferior performance.High-entropy engineering is expected to be effective in tailoring the balance between dielectric and magnetic losses through compositional design.Herein,three HE TMB2 powders with nominal equimolar TM including HE TMB2-I(TM=Zr,Hf,Nb,Ta),HE TMB2-2(TM=Ti,Zr,Hf,Nb,Ta),and HE TMB2-3(TM=Cr,Zr,Hf,Nb,Ta)have been designed and prepared by one-step boro/carbothermal reduction.As a result of synergistic effects of strong attenuation capability and impedance match,HE TMB2-1 shows much improved performance with the optimal minimum reflection loss(RL_(min))of-59.6 dB(8.48 GHz,2.68 mm)and effective absorption bandwidth(EAB)of 7.6 GHz(2.3 mm).Most impressively,incorporating Cr in HE TMB2-3 greatly improves the impedance match over 1-18 GHz,thus achieving the RLmin of-56.2 dB(8.48 GHz,2.63 mm)and the EAB of 11.0 GHz(2.2 mm),which is superior to most other EM wave absorbing materials.This work reveals that constructing high-entropy compounds,especially by incorporating magnetic elements,is effectual in tailoring the impedance match for highly conductive compounds,i.e.,tuning electrical conductivity and boosting magnetic loss to realize highly efficient and broadband EM wave absorption with dielectric and magnetic coupling in single-phase materials. | Weiming ZHANG Fu-Zhi DAI Huimin XIANG Biao ZHAO Xiaohui WANG Na NI Rajamallu KARRE Shijiang WU Yanchun ZHOU | 2021 | Journal of Advanced Ceramics2021，10，6： | 4 |
| 5 | High-entropy perovskite RETa_(3)O_(9) ceramics for high-temperature environmental/thermal barrier coatings显示文摘Four high-entropy perovskite(HEP)RETa_(3)O_(9) samples were fabricated via a spark plasma sintering(SPS)method,and the corresponding thermophysical properties and underlying mechanisms were investigated for environmental/thermal barrier coating(E/TBC)applications.The prepared samples maintained low thermal conductivity(1.50 W·m^(−1)·K^(−1)),high hardness(10 GPa),and an appropriate Young’s modulus(180 GPa),while the fracture toughness increased to 2.5 MPa·m^(1/2).Nanoindentation results showed the HEP ceramics had excellent mechanical properties and good component homogeneity.We analysed the influence of different parameters(the disorder parameters of the electronegativity,ionic radius,and atomic mass,as well as the tolerance factor)of A-site atoms on the thermal conductivity.Enhanced thermal expansion coefficients,combined with a high melting point and extraordinary phase stability,expanded the applications of the HEP RETa_(3)O_(9).The results of this study had motivated a follow-up study on tantalate high-entropy ceramics with desirable properties. | Lin CHEN Baihui LI Jun GUO Yuke ZHU Jing FENG | 2022 | Journal of Advanced Ceramics2022，11，4： | 4 |
| 6 | 大气等离子喷涂工艺对纳米结构和传统Yb_(2)SiO_(5)涂层微观结构的影响显示文摘纳米材料由于具有一些独特的效果而表现出了独特的性能,纳米结构稀土硅酸盐被认为是很有前景的环境障碍涂层(EBC)材料之一。稀土硅酸盐材料中Yb_(2)SiO_(5)因其卓越的高温相稳定性、对水蒸气环境的耐久性、低热导率以及优秀的化学稳定性受到了研究者们的广泛关注。本文研究了大气等离子喷涂工艺(APS)参数对纳米结构和传统Yb_(2)SiO_(5)涂层微观结构的影响,并研究了相同大气等离子喷涂工艺下,纳米结构Yb_(2)SiO_(5)喂料和传统Yb_(2)SiO_(5)喂料对涂层微观结构的影响,分析了APS制备过程中不同结构喂料对涂层结构影响机制。结果表明:相同喷涂参数制备的纳米结构Yb_(2)SiO_(5)涂层孔隙率低于传统Yb_(2)SiO_(5)涂层,以及纳米结构Yb_(2)SiO_(5)涂层的铺展性和融化度均优于传统Yb_(2)SiO_(5)涂层,表明纳米结构Yb_(2)SiO_(5)涂层为很有前途的环境障碍涂层之一。 | 郑涛 王顺 周宁 郭东辉 王泽龙 徐宝升 | 2023 | 热喷涂技术2023，15，4： | 0 |
| 7 | Pressure infiltration of molten aluminum for densification of environmental barrier coatings显示文摘Environmental barrier coatings(EBCs)effectively protect the ceramic matrix composites(CMCs)from harsh engine environments,especially steam and molten salts.However,open pores inevitably formed during the deposition process provide the transport channels for oxidants and corrosives,and lead to premature failure of EBCs.This research work proposed a method of pressure infiltration densification which blocked these open pores in the coatings.These results showed that it was difficult for aluminum to infiltrate spontaneously,but with the increase of external gas pressure and internal vacuum simultaneously,the molten aluminum obviously moved forward,and finally stopped infiltrating at a depth of a specific geometry.Based on the wrinkled zigzag pore model,a mathematical relationship between the critical pressure with the infiltration depth and the pore intrinsic geometry was established.The infiltration results confirmed this relationship,indicating that for a given coating,a dense thick film can be obtained by adjusting the internal and external gas pressures to drive a melt infiltration. | Lin DONG Mei-Jun LIU Xiao-Feng ZHANG Xue-Shi ZHUO Jia-Feng FAN Guan-Jun YANG Ke-Song ZHOU | 2022 | Journal of Advanced Ceramics2022，11，1： | 0 |
| 8 | 高熵(TiVTaMoW)C陶瓷与不同配副间的摩擦磨损特性显示文摘为探究高熵碳化物陶瓷作为耐磨部件在摩擦学领域中的应用前景,以金属碳化物为原料,通过高能球磨和两步热压烧结法制备了一种元素分布均匀、无偏聚和偏析的高熵(TiVTaMoW)C陶瓷。研究了(TiVTaMoW)C与Al_(2)O_(3)、SiC和Si_(3)N_(4)3种配副材料在室温及800℃条件下的摩擦磨损特性。结果表明:室温条件下,(TiVTaMoW)C与3种配副对摩均表现出优异的摩擦学性能,尤其与SiC对摩具有最低的摩擦系数和磨损率,分别可低至(0.38±0.01)和(1.52±0.36)×10^(-7) mm^(3)/(N·m)。800℃条件下,(TiVTaMoW)C表面氧化严重,磨损明显加剧,磨损率上升至10^(-4) mm^(3)/(N·m)数量级。高温氧化生成的MoO_(3)和V_(2)O_(5)具有较低剪切强度,摩擦过程转移至配副球接触面上形成转移膜,有效保护了配副材料的磨损。综合比较,SiC作为配副在室温和800℃条件下均表现出更优异的摩擦相容性。 | 李继承 陈淑娜 孙秋安 樊恒中 苏云峰 宋俊杰 胡丽天 张永胜 | 2022 | 硅酸盐学报2022，50，6： | 0 |
| 9 | 航空发动机涡轮叶片热障涂层研究现状显示文摘热障涂层是一种可以有效保障航空发动机涡轮叶片正常工作,同时显著提高其工作效率和服役时间的表面防护技术。热障涂层的性能在很大程度上影响叶片的承温和抗腐蚀能力,进而间接影响航空发动机的服役性能。涂层性能主要受其结构和材料2个方面的影响。介绍了涂层结构的优缺点和研究进展,当前常见的结构形式有双层结构、多层结构和梯度结构;介绍了粘结层材料的研究进展;对陶瓷层材料的研究进展进行了详述,如YSZ的掺杂改性、A2B2O7型化合物、钙钛矿结构材料以及近年来兴起的几种高熵陶瓷材料,其中高熵陶瓷材料包括:高熵稀土钽酸盐、铝酸盐、锆/铪酸盐、磷酸盐、硅酸盐以及高熵稀土氧化物,分别从热导率、热膨胀系数、断裂韧性、热循环寿命和抗腐蚀能力等方面对其进行介绍;概述了热障涂层常见的几种失效形式如:TGO失效、CMAS腐蚀以及高温烧结,并且对其发生机理进行简要的介绍;展望了热障涂层未来的发展趋势和方向。 | 贾宜委 王鹤峰 王宇迪 赵帅 昂康 | 2023 | 表面技术2023，52，11： | 0 |
| 10 | 高熵稀土非萤石型氧化物陶瓷研究进展显示文摘随着航空航天、机械、能源与军事领域的快速发展,高熵材料凭借其独特的优势已经成为当前材料研究领域的一大热点。针对目前传统的萤石型氧化物陶瓷材料在一些领域的应用限制,非萤石型氧化物陶瓷发挥其特有的优势,是目前在电、光、磁、热等领域应用较为广泛的一类材料。本文综述近5年国内外高熵稀土非萤石型氧化物材料的研究现状,对新型高熵稀土非萤石型氧化物陶瓷进行了分类总结,并对其进行了展望。 | 昝文宇 马北越 | 2024 | 耐火与石灰2024，49，1： | 0 |
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