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Journal of Advanced Ceramics 2022年第9期11卷 1445-1456页

作者： Yi HAN Peng-an ZONG muzhang huang Zesheng YANG Yingjie FENG Wei PAN Peng ZHANG Chunlei WAN State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Institute of Welding and Surface Engineering Technology Faculty of Materials and ManufacturingBeijing University of TechnologyBeijing 100124China

Yttria-stabilized zirconia(YSZ)has been used as a thermal barrier coating(TBC)material in gas turbines for several decades.Although continuous efforts have been made to develop novel TBC materials that can work at a higher temperature,no single material other than YSZ has all the desired attributes for the TBCs.In this paper,we report the in-situ synthesis of quasi-binary GdNbO_(4)/Gd_(3)NbO_(7)composites based on the simple Gd_(2)O_(3)-Nb_(2)O_(5)binary phase diagram.The fracture toughness of these quasi-binary composites is remarkably enhanced compared with the value predicted by the rule of mixtures because the ferroelastic domain switching is more activated due to the residual stress in the quasi-binary composites,which triggers more crack defections due to the enlarged process zone.Additionally,the Gd_(3)NbO_(7)phase provides a low thermal conductivity due to the substantial chemical inhomogeneity,which diffuses phonons.Gd_(3)NbO_(7)/GdNbO_(4)exhibits a balanced thermal conductivity of 1.6 W/(m·K)at 1073 K and a toughness value of 2.76 MPa·m0.5,and these values are among the best comprehensive properties that have been obtained for new TBC materials.The work demonstrates a feasible approach of designing a new TBC material with balanced properties and can be easily fabricated.

关键词： thermal barrier coating(TBC) fracture toughness thermal conductivity residual stress

Opaque Gd_(2)Zr_(2)O_(7)/GdMnO_(3) thermal barrier materials for thermal radiation shielding:The effect of polaron excitation

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Journal of Materials Science & Technology 2022年第5期100卷 67-74页

作者： muzhang huang Jia Liang Peng Zhang Yi Li Yi Han Zesheng Yang Wei Pan Chunlei Wan State Key Lab of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China

Opaque thermal barrier materials play a pivotal role in thermal radiation shielding of turbine blades,since the intensity of thermal radiation rapidly increases with the increase of operating temperature of gas turbines and has become a new and major concern for the durability of metallic blades.The conventional thermal barrier coating(TBC)materials such as YSZ and Gd_(2)Zr_(2)O_(7),however,are almost translucent to thermal radiation and are unable to protect the blades at such harsh environment.Although searching for new thermal barrier materials is significant,it is still a challenge to make the current TBC materials opaque without significantly modifying the composition or other physical properties.To cope with this challenge,GdMnO_(3) is incorporated as an absorptive second phase into Gd_(2)Zr_(2)O_(7) in this work,which is originally translucent(absorption coefficient 10^(1)-10^(2) m^(-1))in the near-infrared wavelengths.Intriguingly,with less than 5 wt.%GdMnO_(3),the Gd_(2)Zr_(2)O_(7)/GdMnO_(3) becomes opaque to thermal radiation and successfully refrains the rise of thermal conductivity at high temperatures.Meanwhile,the lattice thermal conductivity and mechanical properties are almost unchanged.The small polaron mechanism is confirmed for GdMnO_(3),leading to a high absorption coefficient(>10^(6) m^(-1))for near-infrared radiation.To understand the underling mechanism,a theoretical model is built to estimate the absorption coefficient of the Gd_(2)Zr_(2)O_(7)/GdMnO_(3) composites(>10^(4) m^(-1)).This paper proposes a powerful strategy to design thermal-radiation-shielding TBCs through incorporating minor second-phase particles with high-absorption mechanism,such as polaron excitation.

关键词： Thermal barrier coatings Thermal radiation Radiative heat transfer Emissivity Small polaron

Medium-entropy(Me,Ti)_(0.1)(Zr,Hf,Ce)_(0.9)O_(2)(Me=Y and Ta):Promising thermal barrier materials for high-temperature thermal radiation shielding and CMAS blocking

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Journal of Materials Science & Technology 2022年第28期123卷 144-153页

作者： Shuaihang Qiu Huimin Xiang Fu-Zhi Dai Hailong Wang muzhang huang Chunlei Wan Qing Meng Jiangtao Li Xiaohui Wang Yanchun Zhou Science and Technology on Advanced Functional Composite Laboratory Aerospace Research Institute of Materials and Processing TechnologyBeijing 100076China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China State Key Lab of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Technical Institute of Physics and Chemistry Chinese Academy of SciencesBeijing 100190China Institute of Metal Research Chinese Academy of SciencesShenyang 110016China

With continuous enhancement of gas-turbine inlet temperature and rapid increase of radiant heat transfer,thermal barrier coating(TBC)materials with a combination of low thermal conductivity and good high-temperature thermal radiation shielding performance play vital roles in ensuring the durability of metallic blades.However,yttria-stabilized zirconia(YSZ),as the state-of-the-art TBC and current industry standard,is unable to meet such demands since it is almost translucent to high-temperature thermal radiation.Besides,poor corrosion resistance of YSZ to molten calcia-magnesia-alumina-silicates(CMAS)also impedes its application in sand,dust,or volcanic ash laden environments.In order to improve the hightemperature thermal radiation shielding performance and CMAS resistance of YSZ and further reduce its thermal conductivity,two medium-entropy(ME)oxide ceramics,ME(Y,Ti)_(0.1)(Zr,Hf,Ce)_(0.9)O_(2)and ME(Ta,Ti)_(0.1)(Zr,Hf,Ce)_(0.9)O_(2),were designed and prepared by pressureless sintering of binary powder compacts in this work.ME(Y,Ti)_(0.1)(Zr,Hf,Ce)_(0.9)O_(2)presents cubic structure but a trace amount of secondary phase,while ME(Ta,Ti)_(0.1)(Zr,Hf,Ce)_(0.9)O_(2)displays a combination of tetragonal phase(81.6 wt.%)and cubic phase(18.4 wt.%).Both ME(Y,Ti)_(0.1)(Zr,Hf,Ce)_(0.9)O_(2)and ME(Ta,Ti)_(0.1)(Zr,Hf,Ce)_(0.9)O_(2)possess better high-temperature thermal radiation shielding performance than YSZ.Especially,the high-temperature thermal radiation shielding performance of ME(Ta,Ti)_(0.1)(Zr,Hf,Ce)_(0.9)O_(2)is superior to that of ME(Y,Ti)_(0.1)(Zr,Hf,Ce)_(0.9)O_(2)due to its narrower band gap and correspondingly higher infrared absorbance(above 0.7)at the waveband of 1 to 5μm.The two ME oxides also display significantly lower thermal conductivity than YSZ and close thermal expansion coefficients(TECs)to YSZ and Ni-based superalloys.In addition,the two ME oxides possess excellent CMAS resistance.After attack by molten CMAS at 1250℃for 4 h,merely~2μm thick penetration layer has been formed and the structure below th

关键词： Medium-entropy ceramics Thermal barrier coatings Thermal radiation shielding CMAS resistance Infrared absorbance

热处理对大气等离子喷涂LaTi_(2)Al_(9)O_(19)-Zr_(0.92)Y_(0.08)O_(1.96)复合涂层粉末的影响

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稀有金属材料与工程 2022年第5期51卷 1601-1605页

作者：杨泽生宗鹏安黄慕章韩毅周华建冯英杰张鹏万春磊清华大学新型陶瓷与精细工艺国家重点实验室北京100084 南京工业大学材料科学与工程学院江苏南京211816

将纳米/亚微米级Zr_(0.92)Y_(0.08)O_(1.96)(YSZ)增韧稀土复合氧化物LaTi_(2)Al_(9)O_(19)(LTA)颗粒通过喷雾干燥制备出喷涂粉体,采用不同温度对其进行煅烧,并研究不同温度的热处理对喷雾干燥粉体的流动性、松装密度和形貌的影响。结果... 详细信息

将纳米/亚微米级Zr_(0.92)Y_(0.08)O_(1.96)(YSZ)增韧稀土复合氧化物LaTi_(2)Al_(9)O_(19)(LTA)颗粒通过喷雾干燥制备出喷涂粉体,采用不同温度对其进行煅烧,并研究不同温度的热处理对喷雾干燥粉体的流动性、松装密度和形貌的影响。结果表明:未经热处理的喷雾干燥粉体呈现出疏松结构,粒径为40~80μm。经过热处理后,LTA-YSZ颗粒之间的结合更加紧密,在1100℃下煅烧的粉体具有最好的喷雾特性和形貌。通过等离子喷涂进行沉积制备的LTA-YSZ涂层呈现良好的层状结构,并伴有缺陷。

关键词：喷雾干燥溶胶凝胶法流动性松装密度涂层

髓系触发受体-1基因RNAi慢病毒载体的构建及功能初步检测

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中南大学学报（医学版） 2009年第10期34卷 970-977页

作者：宋达疆黄晓元杨兴华肖目张王双中南大学湘雅一医院烧伤整形科长沙410008 中南大学湘雅一医院检验科长沙410008

目的:构建髓系触发受体-1(TREM-1)基因RNAi慢病毒载体,探讨TREM-1在脆弱类杆菌所致炎症反应中的作用。方法:根据小鼠TREM-1 mRNA序列选择4个靶序列并设计合成4对双链DNAoligo,其两端含酶切位点黏端,同时合成1对阴性对照双链DNA oligo;... 详细信息

目的:构建髓系触发受体-1(TREM-1)基因RNAi慢病毒载体,探讨TREM-1在脆弱类杆菌所致炎症反应中的作用。方法:根据小鼠TREM-1 mRNA序列选择4个靶序列并设计合成4对双链DNAoligo,其两端含酶切位点黏端,同时合成1对阴性对照双链DNA oligo;将以上5对双链DNA oligo退火后连入pGCSIL-GFP载体,经PCR及测序鉴定后,将以上质粒分别与包装质粒混合物共转染293T细胞,包装产生病毒颗粒。各组病毒载体转染Raw264.7细胞后,运用real-time PCR和ELISA检测TREM-1 mR-NA和蛋白表达水平。实时定量PCR和ELISA观察干扰TREM-1后脆弱杆菌内毒素引发的Raw264.7细胞内毒素血症模型中TREM-1的表达变化。结果:PCR和测序证实目的双链DNA oligo片段已被准确克隆到pGCSIL-GFP载体;各质粒与包装质粒共转染293T细胞后产生了高滴度的慢病毒颗粒;各组慢病毒感染Raw264.7细胞后均可以显著抑制TREM-1的表达,以pGCSIL-GFP/Lenti-1组效果最明显。在脆弱杆菌内毒素引发的体外细胞内毒素血症模型中TREM-1表达明显增高,实时定量PCR表明慢病毒干扰载体能显著抑制模型中TREM-1的表达。结论:成功构建了小鼠TREM-1基因RNAi慢病毒载体,所构建的慢病毒载体能够抑制脆弱类杆菌内毒素所诱导的TREM-1的表达。

关键词： RNAi 髓系触发受体-1 慢病毒载体脆弱类杆菌

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工艺参数对PC塑料泡孔结构影响

现代塑料加工应用 2007年第6期19卷 49-51页

作者：黄目张周南桥华南理工大学聚合物新型成型装备国家工程研究中心聚合物成型加工工程教育部重点实验室广东广州510640

采用自制的微孔发泡模拟机研究了温度和压力以及气体饱和时间对微孔聚碳酸酯(PC)泡孔结构的影响。结果表明,对于微孔PC泡沫塑料的成型存在一个最佳温度值;随着饱和压力升高,泡孔直径变小,泡孔的密度增大;气体饱和时间对PC泡沫塑料泡孔... 详细信息

采用自制的微孔发泡模拟机研究了温度和压力以及气体饱和时间对微孔聚碳酸酯(PC)泡孔结构的影响。结果表明,对于微孔PC泡沫塑料的成型存在一个最佳温度值;随着饱和压力升高,泡孔直径变小,泡孔的密度增大;气体饱和时间对PC泡沫塑料泡孔结构的影响不是很明显,在一定的饱和时间范围内,延长PC发泡时间有利于得到更均匀的泡孔结构。

关键词：聚碳酸酯微孔塑料发泡温度饱和压力

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聚碳酸酯微孔泡沫塑料研究进展

工程塑料应用 2007年第6期35卷 74-77页

作者：黄目张周南桥文生平李兵华南理工大学聚合物新型成型装备国家工程研究中心广州510640

阐述了聚碳酸酯(PC)微孔泡沫塑料的制备方法,包括间歇成型法、连续挤出成型法、模压成型法;综述了PC纳米复合微孔泡沫塑料的制备;介绍了PC微孔泡沫塑料的拉伸性能、疲劳性能、时温效应及电性能;并提出了PC微孔泡沫塑料的应用前景和研究... 详细信息

阐述了聚碳酸酯(PC)微孔泡沫塑料的制备方法,包括间歇成型法、连续挤出成型法、模压成型法;综述了PC纳米复合微孔泡沫塑料的制备;介绍了PC微孔泡沫塑料的拉伸性能、疲劳性能、时温效应及电性能;并提出了PC微孔泡沫塑料的应用前景和研究方向。

关键词：微孔泡沫塑料聚碳酸酯成型方法纳米复合微孔泡沫塑料性能研究

髓系触发受体-1在脆弱类杆菌诱导小鼠脓毒血症中的作用

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中国普通外科杂志 2009年第2期18卷 162-166页

作者：宋达疆黄晓元杨兴华肖目张王双中南大学湘雅医院烧伤整形科湖南长沙410008 中南大学湘雅医院检验科湖南长沙410008

目的探讨小鼠TREM-1基因重组慢病毒干扰载体(Lentivector,LV)TREM-1 vshRNA对脆弱杆菌脓毒血症小鼠脾脏中促炎症因子TNF-α,IL-1β,IL-6表达及NF-κB通路的影响。方法将清洁级BALB/c雄性小鼠分成4组,即正常对照组(C组),脆弱类杆菌脓毒... 详细信息

目的探讨小鼠TREM-1基因重组慢病毒干扰载体(Lentivector,LV)TREM-1 vshRNA对脆弱杆菌脓毒血症小鼠脾脏中促炎症因子TNF-α,IL-1β,IL-6表达及NF-κB通路的影响。方法将清洁级BALB/c雄性小鼠分成4组,即正常对照组(C组),脆弱类杆菌脓毒症模型生理盐水组(S组),TREM-1 vshRNA干扰实验组(T组)和GFPvshRNA干扰实验组(G组)。观察各组中小鼠脾内TREM-1,TNF-α,IL-1β,lL-6的蛋白表达以及IkBa,pDAP12,NF-κB p65的表达情况的变化。结果与C组比,T组TREM-1 mRNA及蛋白表达均有显著增加(P<0.01);T,G,S组脾细胞中TNF-α,IL-1β,IL-6的含量均较C组显著增加(P<0.01);T组脾细胞中TNF-α,IL-1β,IL-6的含量均较S,G组明显降低(P<0.01)。S组脾细胞中的pDAP12和核内NF-κB p65蛋白表达水平明显增强,IκBa蛋白表达水平降低;而T组与S组比较,pDAP12和NF-κB p65蛋白的表达水平显著下调。结论小鼠TREM-1基因重组慢病毒干扰载体可选择性抑制TREM-1表达,下调脆弱类杆菌诱导的促炎症因子的分泌,而转染可能是通过下调DAP12的表达,稳定IkBa/NF-κB复合物,抑制TNF-α,IL-1β,IL-6,IL-8基因的转录,而对脆弱类杆菌脂多糖炎症反应产生抑制作用。

关键词：脓毒症 RNA,干扰髓系细胞触发受体-1 脆弱杆菌慢病毒载体

背阔肌肌皮瓣及胸背动脉穿支皮瓣在不同创面中的应用

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中华整形外科杂志 2019年第3期35卷 269-273页

作者：李连楚肖目张刘安金金辉张文马铮铮唐宁宁黄晓元湘雅常德医院整形美容烧伤科 415000 常德骨科医院创伤外科 415000

目的探讨背阔肌肌皮瓣及胸背动脉穿支皮瓣在不同创面修复中的应用与选择。方法2012年3月至2018年2月,湘雅常德医院整形美容烧伤科收治8例男性患者,年龄35~ 67岁,其中外伤4例,肿瘤2例,骨髓炎2例。创面大小20.0 cm×6.5 cm^26.0 cm×19.0... 详细信息

目的探讨背阔肌肌皮瓣及胸背动脉穿支皮瓣在不同创面修复中的应用与选择。方法2012年3月至2018年2月,湘雅常德医院整形美容烧伤科收治8例男性患者,年龄35~ 67岁,其中外伤4例,肿瘤2例,骨髓炎2例。创面大小20.0 cm×6.5 cm^26.0 cm×19.0 cm。根据创面情况选择性地应用带胸背动脉蒂的岛状背阔肌肌皮瓣、游离背阔肌肌皮瓣、胸背动脉穿支皮瓣联合肩胛皮瓣进行修复,8例中带血管蒂转移5例,吻合血管游离移植联合抗生素骨水泥珠链2例,胸背动脉穿支皮瓣联合肩胛皮瓣1例。结果8例9块皮瓣、肌皮瓣均全部成活,皮瓣面积22.0 cm×7.5 cm^28.0 cm×21.0 cm,供区及受区愈合良好。术后随访2个月至2年,皮瓣血运及肢体功能良好,外观满意,骨髓炎得到控制,肿瘤无复发。结论根据创面特点选择性地应用胸背动脉穿支皮瓣、带蒂或游离背阔肌肌皮瓣,可有效地修复肌肉、皮肤软组织缺损、骨髓炎、肿瘤切除后创面。

关键词：外科皮瓣背阔肌肌皮瓣胸背动脉穿支皮瓣外伤骨髓炎肿瘤

DETERMINATION OF THE STANDARD ENTHALPY OF FORMATION OF URANIUM TETRAFLUORIDE BY SOLUTION CALORIMETRY

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Science in China,Ser.A 1980年第11期 1386-1395页

作者：胡日恒倪锡荣戴慕仉刘奎文胡粹青石道钧张明文黄为钧 Institute of Chemistry Academia Sinica

The standard enthalpy of formation of anhydrous uranium tetrafluoride （crystalline state） is determined by solution calorimetry with the result △Hfo （298.15 K） = - 1894.5 ± 7.5 kJ · mol-1.The result reported by... 详细信息

关键词： HCI DETERMINATION OF THE STANDARD ENTHALPY OF FORMATION OF URANIUM TETRAFLUORIDE BY SOLUTION CALORIMETRY AIC UCI UF HF