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| 1 | High entropy defective fluorite structured rare-earth niobates and tantalates for thermal barrier applications显示文摘Rare-earth tantalates and niobates(REjTaO7 and REjNbO7)have been considered as promising candidate thermal barrier coating(TBC)materials in next generation gas-turbine engines due to their ultra-low thermal conductivity and better thermal stability than yttria-stabilized zirconia(YSZ).However,the low Vickers hardness and toughness are the main shortcomings of RE;TaO-and REjNbOr that limit their applications as TBC materials.To increase the hardness,high entropy(Yu3Ybu3Er/3)sTaOr,(Y13YbnErns)NbO,and(Sm1/6Eu1/6Y 1/6Yb1/6Lu1/6Er1/6)3(Nb1/2Ta1/2)O7 are designed and synthesized in this study.These high entropy ceramics exhibit high Vickers hardness(10.912.0 GPa),close thermal expansion coefficients to that of single-principal-component RE3TaO,and RE;NbO,(7.9×10^-6-10.8×10-6 C-1 at room temperature),good phase stability,and good chemical compatibility with thermally grown Al2O3,which make them promising for applications as candidate TBC materials. | Zifan ZHAO Heng CHEN Huimin XIANG Fu-Zhi DAI Xiaohui WANG Wei XU Kuang SUN Zhjjian PENG Yanchun ZHOU | 2020 | Journal of Advanced Ceramics2020，9，3： | 27 |
| 2 | 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 |
| 3 | One-step synthesis and electromagnetic absorption properties of high entropy rare earth hexaborides(HE REB6)and high entropy rare earth hexaborides/borates(HE REB6/HE REB03)composite powders显示文摘Considering the emergence of severe electromagnetic interference problems,it is vital to develop electromagnetic(EM)wave absorbing materials with high dielectric,magnetic loss and optimized impedance matching.However,realizing the synergistic dielectric and magnetic losses in a single phase material is still a challenge.Herein,high entropy(HE)rare earth hexaborides(REB6)powders with coupling of dielectric and magnetic losses were designed and successfully synthesized through a facial one-step boron carbide reduction method,and the effects of high entropy borates intermedia phases on the EM wave absorption properties were investigated.Five HE REB6 ceramics including(Ce0.2Y0.2Sm0.2Er0.2Yb0.2)B6,(Ce0.2Hu0.2Sm0.2Er0.2Yb0.2)B6,(Ce0.2Y0.2Eu0.2Er0.2Yb0.2)B6,(Ce0.2Ya2Sm0.2Eu0.2Yb0.2)B6,and(Nd0.2Y0.2Sm0.2Eu0.2Yb0.2)B6 possess CsCl-type cubic crystal structure,and their theoretical densities range from 4.84 to 5.25 g/cm^(3).(Ce02Y0.2Sm0.2Er0.2Yb02)B6 powders with the average particle size of 1.86 jim were found to possess the best EM wave absorption properties among these hexaborides.The RLmin value of(Ce0.2Y0.2Sm0.2Er0.2Yb0.2)B6 reaches-33.4 dB at 11.5 GHz at thickness of 2 mm;meanwhile,the optimized effective absorption bandwidth(EAB)is 3.9 GHz from 13.6 to 17.5 GHz with a thickness of 1.5 mm.The introduction of HE REB03(RE=Ce,Y,Sm,Eu,Er,Yb)as intermediate phase will give rise to the mismatching impedance,which will further lead to the reduction of reflection loss.Intriguingly,the HEREB6/HEREB03 still possess wide effective absorption bandwidth of 4.1 GHz with the relative low thickness of 1.7 mm.Considering the better stability,low density,and good EM wave absorption properties,HE REB6 ceramics are promising as a new type of EM wave absorbing materials. | Weiming ZHANG Biao ZHAO Huimin XIANG Fu-Zhi DAI Shijiang WU Yanchun ZHOU | 2021 | Journal of Advanced Ceramics2021，10，1： | 15 |
| 4 | High-entropy(Nd_(0.2)Sm_(0.2)Eu_(0.2)Y_(0.2)Yb_(0.2))_(4)Al_(2)O_(9) with good high temperature stability,low thermal conductivity,and anisotropic thermal expansivity显示文摘The critical requirements for the environmental barrier coating(EBC)materials of silicon-based ceramic matrix composites(CMCs)include good tolerance to harsh environments,thermal expansion matches with the interlayer mullite,good high-temperature phase stability,and low thermal conductivity.Cuspidine-structured rare-earth aluminates RE_(4)Al_(2)O_(9) have been considered as candidates of EBCs for their superior mechanical and thermal properties,but the phase transition at high temperatures is a notable drawback of these materials.To suppress the phase transition and improve the phase stability,a novel cuspidine-structured rare-earth aluminate solid solution(Nd_(0.2)Sm_(0.2)Eu_(0.2)Y_(0.2)Yb_(0.2))_(4)Al_(2)O_(9) was designed and successfully synthesized inspired by entropy stabilization effect of high-entropy ceramics(HECs).The as-synthesized HE(Nd_(0.2)Sm_(0.2)Eu_(0.2)Y_(0.2)Yb_(0.2))_(4)Al_(2)O_(9) exhibits a close thermal expansion coefficient(6.96×10^(-6) K^(-1) at 300-1473 K)to that of mullite,good phase stability from 300 to 1473 K,and low thermal conductivity(1.50 W·m^(-1)·K^(-1) at room temperature).In addition,strong anisotropic thermal expansion has been observed compared to Y_(4)Al_(2)O_(9) and Yb_(4)Al_(2)O_(9).The mechanism for low thermal conductivity is attributed to the lattice distortion and mass difference of the constituent atoms,and the anisotropic thermal expansion is due to the anisotropic chemical bonding enhanced by the large size rare-earth cations. | Zifan ZHAO Huimin XIANG Heng CHEN Fu-Zhi DAI Xiaohui WANG Zhijian PENG Yanchun ZHOU | 2020 | Journal of Advanced Ceramics2020，9，5： | 12 |
| 5 | 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 |
| 6 | 高熵陶瓷研究进展显示文摘高熵陶瓷是一类新兴的陶瓷材料,因其独特的结构和性能,近年来受到广泛的关注。本文从高熵陶瓷的定义出发,通过概述固相反应法、前驱体热解法以及放电等离子烧结法等高熵陶瓷制备方法,介绍了合成高熵陶瓷的工艺流程;并且详细阐述了近年来高熵氧化物、高熵碳化物、高熵二硼化物等体系的高熵陶瓷的研究成果,对不同体系的高熵陶瓷的特点和应用前景进行了归纳和总结。 | 徐亮 王红洁 苏磊 | 2021 | 宇航材料工艺2021，51，1： | 6 |
| 7 | 高熵化设计:稀土硅酸盐材料关键性能优化新策略显示文摘环境障涂层是先进航空发动机高温结构部件用碳化硅纤维增强碳化硅(SiCf/SiC)陶瓷基复合材料的关键防护。稀土硅酸盐具有低热膨胀系数、优良的抗水氧/CMAS腐蚀性能以及与硅基陶瓷良好的化学相容性,是目前国际公认的优选环境障涂层体系。常规含单一稀土元素的稀土硅酸盐环境障涂层材料,存在热应力失配、高温相转变和耐腐蚀性能差等问题,尚无法完全满足极端燃气环境中的长寿命服役要求。本综述介绍了为解决稀土硅酸盐环境障涂层的关键性能局限,利用高熵化合物设计方法,针对稀土硅酸盐热学性能(热膨胀系数和热导率)调控、耐CMAS腐蚀性能提升和相结构稳定性优化方面获得的新进展。这些研究进展为稀土硅酸盐材料的创新设计提供了新思路,为其作为下一代环境障涂层的性能突破提供了支撑。 | 孙鲁超 任孝旻 杜铁锋 罗颐秀 张洁 王京阳 | 2021 | 无机材料学报2021，36，4： | 5 |
| 8 | 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 |
| 9 | A位无序高熵钙钛矿氧化物的介电及铁电性能显示文摘复杂成分的高熵氧化物可以设计成具有有趣物理现象的新型铁电材料。通过传统高温固相法成功地合成了一种单相钙钛矿结构(K_(0.5)Bi_(0.5))_(0.2)Ba_(0.2)Sr_(0.2)Ca_(0.2)Mg_(0.2)TiO_(3)高熵陶瓷,研究了其介电性能和铁电性能。多元素掺杂使得陶瓷在测试温度范围内没有观察到明显介电弛豫峰。低于300℃时,陶瓷介电常数温度稳定性较高。当测试温度为650℃,频率为100 Hz时,得到最大的介电常数8887。结果表明:高熵概念的引入不仅在成分复杂的材料中可以发现新的高熵铁电体,而且是调节电子陶瓷性能的可行策略。 | 倪波 张晓燕 甄茹 齐西伟 | 2022 | 硅酸盐学报2022，50，6： | 1 |
| 10 | 高熵陶瓷的制备与应用显示文摘高熵陶瓷作为一种先进陶瓷材料,因其具有较大的构型熵和独特的晶格结构,近年来成为研究热点。相比于最早提出的高熵合金,高熵陶瓷由于其微观结构的不同,在无序构型中具有了更高的熵稳定性。本文从阐述高熵陶瓷的定义开始,概述了近年来不同体系高熵陶瓷的物理化学特性;总结了不同形态高熵陶瓷的合成路径,对高熵陶瓷在力学性能、低导热性、热电性以及催化作用等特性方面的广泛应用进行了整理归纳;展望了未来高熵陶瓷材料的开发思路。 | 战再吉 程庭信 李国伟 刘秋云 | 2022 | 燕山大学学报2022，46，5： | 0 |
| 11 | 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 |
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