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| 1 | Global warming weakening the inherent stability of glaciers and permafrost显示文摘The Cryosphere has been undergoing a worldwide retreat, as seen in the decrease in the areal extent and volume of glaciers and in the areal extent of permafrost. This paper presents a systematic examination of the inherent stability changes of glaciers and permafrost caused by warming. Various study results suggest that over the past 30 years, the internal temperature of glaciers and permafrost exhibits an overall accelerating warming trend. The warming rate peaked in the mid-2000s and slowed slightly for several years afterward. In recent years, however, the warming rate has seemed to pick up again. The warming of glaciers and permafrost has exerted great impact on their stability, displayed as intensified melting,increased glacier surging, enlargement of supraglacial lakes, and increased permafrost degradation.Even without a future temperature increase, some glaciers will continue to shrink, and the number of surging glaciers will increase. The transition from low-temperature to high-temperature permafrost is a noticeable warning sign of a comprehensive degradation of permafrost. These results indicate that‘‘warming' glaciers and permafrost will exert significant impacts on the hydrology, ecology, and stability of engineering in cold regions. | Yongjian Ding Shiqiang Zhang Lin Zhao Zhongqin Li Shichang Kang | 2019 | Science Bulletin2019，64，4： | 37 |
| 2 | (TiZrHf)P2O7: An equimolar multicomponent or high entropy ceramic with good thermal stability and low thermal conductivity显示文摘Zr P2O7 is a promising material for high temperature insulating applications. However, decomposition above 1400℃ is the bottleneck that limiting its application at high temperatures. To improve the thermal stability, a novel multicomponent equimolar solid solution(Ti Zr Hf)P2O7 was designed and successfully synthesized in this work inspired by high-entropy ceramic(HEC) concept. The as-synthesized(Ti Zr Hf)P2O7 exhibits good thermal stability, which is not decomposed after heating at 1550℃ for 3 h. It also shows lower thermal conductivity(0.78 W m^-1 K^-1) compared to the constituting metal pyrophosphates Ti P2O7, Zr P2O7 and Hf P2O7. The combination of high thermal stability and low thermal conductivity renders(Ti Zr Hf)P2O7 promising for high temperature thermal insulating applications. | Zifan Zhao Huimin Xiang Fu-Zhi Dai Zhijian Peng Yanchun Zhou | 2019 | Journal of Materials Science & Technology2019，35，10： | 12 |
| 3 | Synthesis and Properties of High Performance Functional Polyimides Containing Rigid Nonplanar Conjugated Fluorene Moieties显示文摘A diamine(WuFDA) containing vertical rigid non-planar conjugated fluorene moiety and low polarizability group(C―F)was designed and synthesized through three steps of reactions(halogenated reaction, Suzuki coupling reaction, and reduction reaction).Four kinds of high performance functional polyimides(WuFPI-6 F, WuFPI-BP, WuFPI-BT, and WuFPI-PM) were thus prepared by the condensation polymerization of WuFDA with four commercial dianhydride 6 FDA, BPDA, BTDA, and PMDA, respectively. The polyimides exhibited low dielectric constant, excellent thermal stability, outstanding solubility, good film-forming property, and mechanical properties. The dielectric constants of the polyimides were in the range of 2.28-2.88(f = 10~4 Hz). The 5% weight-loss temperatures(Td 5%)in nitrogen were in the range of 555-584 °C, and the glass transition temperatures(T_g) were in the range of 408-448 °C. The weight loss of WuFPI-BP maintaining at 450 and 500 °C for half an hour was only 0.33% and 1.26%, respectively. All the WuFPIs could be dissolved in almost all organic solvents, even chloroform. The tensile strength and tensile modulus of these films were in the ranges of 78.6-85.7 MPa and 3.1-3.2 GPa, respectively. In addition, the polyimides displayed light color with special fluorescent and resistive switching(ON-OFF) characteristics; the maximum fluorescence emission was observed at 422-424 nm in NMP solution and at 470-548 nm in film state. The memory devices with the configuration of indium tin oxide/WuFPIs/aluminum(ITO/WuFPIs/Al) exhibited distinct volatile memory characteristics of static random access memory(SRAM), with an ON/OFF current ratio of 10~5-10~6. These functional polyimides showed attractive potential applications in the field of high performance flexible polymer photoelectronic devices or polymer memory devices. | Yi-Wu Liu Li-Shuang Tang Lun-Jun Qu Si-Wei Liu Zhen-Guo Chi Yi Zhang Jia-Rui Xu | 2019 | Chinese Journal of Polymer Science2019，37，4： | 10 |
| 4 | Synthesis and Application of Novel Triazine-Based Charring-Foaming Agents in Intumescent Flame Retardant Polypropylene显示文摘Three novel triazine-based charring-foaming agents (M2-CFA,M4-CFA,and M6-CFA) were synthesized successfully with only water as the solvent and were characterized by FT-IR and thermal gravimetric analysis (TGA).These three charring-foaming agents and the byproduct 944-by were employed to study the effectiveness of the novel intumescent flame retardant dopant on the fire retardancy of polypropylene (PP) investigated through UL-94 and limiting oxygen index (LOI) tests.TGA results showed that the M4-CFA presented good char formation ability (char residue: 26.8% at 700 ℃).It was found that the sample with a 2/1 mass ratio of APP to M4-CFA exhibited the best flame retardancy among all the PP composites: 35.5% LOI and a V-0 rating of UL-94.Additionally,the microstructure and morphology of char residues were further studied by XRD,Raman spectroscopy and SEM. | Ligong Chen Yanyan Yuan Bowei Wang Na Liu Yuzhi Xing Yang Li | 2017 | Transactions of Tianjin University2017，23，3： | 9 |
| 5 | Review of the Working Fluid Thermal Stability for Organic Rankine Cycles显示文摘The organic Rankine cycle(ORC)is an efficient power generation technology and has been widely used for renewable energy utilization and industrial waste heat recovery.Thermal stability is a significant property of ORC working fluids and is the primary limitation for working fluid selection and system design.This paper presents a review of the working fluid thermal stability for ORCs,including an analysis of the main theoretical method for thermal stability,a summary of the main experimental method for thermal stability,a summary of the decomposition experimental results for working fluids,and a discussion of the decomposition influence on ORC systems.Further research trends of thermal stability are also discussed in this paper. | DAI Xiaoye SHI Lin QIAN Weizhong | 2019 | Journal of Thermal Science2019，28，4： | 7 |
| 6 | TG6钛合金的热稳定性及其在高温下的部分恢复(英文)显示文摘测试了TG6钛合金盘锻件STA状态+再经600℃,100h试样热暴露在不同温度下的拉伸性能。TG6钛合金随着温度升高,抗拉强度下降,塑性提高。在室温下,与STA状态试样相比,经热暴露后的试样拉伸塑性显著降低,而当测试温度在150℃以上时,试样热暴露后的拉伸塑性显著提高,亦即热稳定性得到很大程度的恢复。引起TG6钛合金热稳定性下降的主要因素是有序α2相的共格析出和表面氧化。在150℃以上的高温条件下,热稳定性的恢复归因于位错滑移模式的变化,随着温度的升高,由位错剪切α2相的集中平面滑移逐渐向位错交滑移转变,促进位错更为均匀的滑移,从而提高塑性,表现在断口上为宏观的平面形向波浪形断裂特征的转变。 | 蔡建明 黄旭 曹春晓 马济民 | 2010 | 稀有金属材料与工程2010，39，11： | 7 |
| 7 | Novel aspects for thermal stability studies and shelf life assessment of modified double-base propellants显示文摘Modified DB propellants, based on energetic nitramine(RDX) were manufactured by solventless extrusion process. Thermal stability and shelf life assessment of modified DB propellant were investigated. Shelf life assessment was evaluated using Van’t Hoff’s formula and artificial aging at 70℃ up to120 days. Quantification of total heat released and heat flow with aging time was conducted using differential scanning calorimetry(DSC) and thermal activity monitoring(TAMIII) respectively. Modified DB formulation based on 20 wt % RDX demonstrated enhanced thermal stability in terms of controlled heat flow, and slow decomposition reactions at elevated temperature. This formulation demonstrated extended service life up to 56 years compared with reference formulation. These novel finding was ascribed to the high thermal stability of RDX and its compatibility with DB constituents. This manuscript shaded the light on novel and effective approach for thermal stability via monitoring thermal activity with aging. | Sherif Elbasuney Ashraf.M. A. Elghafour Mostafa Radwan Ahmed Fahd Hosam Mostafa Ramy Sadek Amr Motaz | 2019 | Defence Technology(防务技术)2019，15，3： | 6 |
| 8 | Mechanism and characteristics of thermal action of HMX explosive mixture containing high-efficiency fuel显示文摘In this study, the thermal stability and detonation properties of three types of explosives were investigated. Results indicated that nanoaluminum powder improved the detonation properties of HMX by increasing the specific surface area of HMX, which substantially increased the explosion heat and power. The decomposition temperatures of the three explosives containing aluminum hydride, ammonia borane, and nanoaluminum powder during slow cook-off at heating rates of 1.5 and 10°C min–1 were measured as 246°C and 241°C, 256°C and 261°C, and 238°C and 264°C, respectively. The explosives containing hydrogen storage materials swelled; however, the nanoaluminum powder was only slightly peeled off at the edge of the grains during cookoff. Differential scanning calorimetry(DSC) curves of the explosives containing hydrogen storage materials exhibited endothermic and exothermic peaks before the major exothermic reaction peak during the cook-off tests. In contrast, only one weak peak was observed in the DSC curve of the explosive containing nanoaluminum powder before the major exothermic reaction. In addition, the additives and adhesives catalyzed the slow cook-off decomposition, which caused the transformation of HMX crystals and accelerated the thermal decomposition reaction of HMX. The addition of high-density hydrogen storage materials to HMX resulted in detonation heats and explosion powers much greater than cure HMX. This improved performance was attributed to the hydrogen storage materials in the explosives participating in a secondary reaction in the reaction zone at the instant of the explosion, effectively realizing complementary lossless energy and thus greatly improving the explosive power of the explosives. | LIU JiPing YANG WeiWei LIU Ying LIU XiaoBo | 2019 | Science China(Technological Sciences)2019，62，4： | 6 |
| 9 | Preparation and thermal stability of zirconia-doped mullite fibers via sol-gel method | Wei WANG Duan WENG Xiao-dong WU | 2011 | Progress in Natural Science:Materials International2011，21，2： | 6 |
| 10 | Thermal stability of Si-doped V2O5/WO3-TiO2 for selective catalytic reduction of NOx by NH3显示文摘The selective catalytic reduction of NOV with NH3 (NH3-SCR) is a very effective technology to control the emission of NOA, and the thermal stability of NH3-SCR catalyst is very important for removal of NOV from diesel engines. In this work, V2O5/WO3-TiO2 (VWT) and SiO2- doped V2O5/WO3-TiO2 (VWTSi10)) catalysts were prepared by impregnation method and characterized by Brunauer- Emmett-Teller (BET), X-ray diffraction (XRD), Raman, temperature programmed reduction by hydrogen (H2-TPR), X-ray photoelectron spectroscopy (XPS) and temperature programmed desorption by ammonia (NH3- TPD). The doping of SiO2 promotes the thermal stability of V2O5/WO3-TiO? for NH3-SCR significantly. After calcination at 650 °C for 50 h, the operation window of 10% SiO2-doped V2O5/WO3-TiO2 is 220-480 °C, while the maximum NOV conversion on V2O5/WO3-TiO2 is about 77%. The presenee of SiO2 obviously blocks the transformation of TiO2 from anatase to rutile and stabilizes the dispersion of VOv and WO3 on the surface. It is available for the existence of V44 and the amount of surface acid sites increases, which inhabits the NH3 oxidation at the high temperature range and promotes NH3-SCR activity. | Xun-Zhe Shao Hong-You Wang Meng-Long Yuan Jie Yang Wang-Cheng Zhan Li Wang Yun Guo Guan-Zhong Lu | 2019 | Rare Metals2019，38，4： | 6 |
| 11 | The Characterization of Sputtered Zr-Ge-N Thin Films as Diffusion Barriers Between Copper and Silicon显示文摘The main purpose of the present micro-structural analysis by transmission electron microscopy(TEM)and X-ray diffraction(XRD)was to investigate whether amorphous Zr-Ge-N films are a potential candidate as a diffusion barrier for Cu wiring used in Si devices.The Zr-Ge-N films were prepared by a radio frequency(RF)reactive magnetron sputter-deposition technique using N2 and Ar mixed gas,and the film structure was found to be sensitive to the gas flow ratio of N2 vs.Ar during sputtering.Polycrystalline Zr-Ge-N films were obtained when the N2/(Ar+N2)ratio was smaller than 0.2 and amorphous-like Zr-Ge-N films were obtained when the ratio was larger than 0.3.Diffusion barrier test was performed by annealing the Cu/Zr-Ge-N/Si film stack under Ar atmosphere.The deposited Zr-Ge-N(C)films remained amorphous even after high temperature annealing.The Cu diffusion profile in the film was assessed by the Auger electron spectroscopy(AES).The results indicate that Cu diffusion was minimal in amorphous Zr-Ge-N(C)films even at high annealing temperatures of 800℃. | Yang, J. J. Liu, B. Liao, X. D. Jiao, G. H. Xu, K. W. | 2012 | 稀有金属材料与工程2012，41，S1： | 5 |
| 12 | Introduction of fluorin into PBO polymer chains:Toward higher thermal stability and lower dielectric constant显示文摘A series of novel fluorinated benzoxazole polymers (6FPBO's) with high thermal stability and low dielectric constant were synthesized by copolymerization of 1,3-diamino-4, 6-dihydroxybenzene dihy-drochloride (DAR), 1,4-benzenedicarboxylic acid (PTA) and various amount of 4'4- (hexafluoroisopro-pylidene) bis (benzoic acid) (BIS-B-AF) in the medium of polyphosphoric acid (PPA). 6FPBO fibers were then obtained via dry-jet wet-spinning technique and characterized by means of Fourier transform infrared (FTIR) spectra, thermogravimetric analysis (TGA), single fiber tensile testing machine and scanning electron microscopy (SEM). FTIR spectrum of 6FPBO fibers indicated that the fluorine groups had been incorporated into PBO molecular chains successfully. TGA curves revealed that 6FPBO fibers possessed high thermal stability just as pure PBO fibers. Moreover, dielectric constant spectrum of 6FPBO exhibited that the polymers had low dielectric constant, especially in the range of high- frequency. | ZHANG Tao HU DaYong JIN JunHong YANG ShengLin LI Guang JIANG JianMing | 2009 | Science China(Technological Sciences)2009，52，1： | 4 |
| 13 | Effects of ceria/zirconia ratio on properties of mixed CeO_2-ZrO_2-Al_2O_3 compound显示文摘A series of CexZr0.50-xAl0.50O1.75(0.05≤x≤0.45) mixed oxides with different Ce/Zr ratio were prepared by co-precipitation method and characterized by means of X-ray diffraction(XRD),Brunauer-Emmet Teller method(BET),temperature-programmed reduction(H2-TPR) and oxygen pulsing technique.The XRD results showed that all samples kept the single CeO2 cubic fluorite structure after calcination at 600 and 1000 oC for 5 h.The results of BET revealed that CexZr0.50-xAl0.50O1.75 with Ce/Zr molar ratio 1/1 exhibited higher specific surface area(212 m2/g) and larger pore volume(0.40 ml/g).For all aged samples,CZA with Ce/Zr molar ratio 3/7 presented the highest specific surface area(104 m2/g) and pore volume(0.34 ml/g).The compounds could still keep prominent structural and textural stability with excellent redox properties even calcined at 1000 oC. | 李红梅 祝清超 李移乐 龚茂初 陈永东 王健礼 陈耀强 | 2010 | Journal of Rare Earths2010，28，1： | 4 |
| 14 | Influence of zirconium addition on microstructure,magnetic properties and thermal stability of nanocrystalline Nd_(12.3)Fe_(81.7)B_(6.0) alloy显示文摘Effect of Zr addition on microstructure, magnetic properties and thermal stability of Nd12.3Fe81.7-xZrxB6.0 (x=0-3.0) ribbons melt-spun and annealed was investigated. Magnetic measurement using vibrating sample magnetometer (VSM) revealed that Zr addition was significantly effective in improving the magnetic properties at room temperature. The intrinsic coercivity Hci of the optimally processed ribbons increased monotonically with increasing Zr content, from 751.7 kA/m for x=0 to 1005.3 kA/m for x=3.0. Unlike the coercivity, the remanence polarization Jr increased first with Zr addition, from 0.898 T up to 1.041 T at x=1.5, and then decreased with further Zr addition. The maximum energy product (BH)max behaved similarly, increasing from 103.1 kJ/m3 to a maximum of 175.2 kJ/m3 at x=1.5. Microstructure studies using atomic force microscopy (AFM) and transmission electron microscopy (TEM) had shown a significant microstructure refinement with Zr addition. The absolute values of temperature coefficients of induction and coercivity were significantly increased with increasing Zr content, indicating that Zr was detrimental to thermal stability of the melt-spun Nd2Fe14B-type material. | 包小倩 朱洁 李伟 高学绪 周寿增 | 2009 | Journal of Rare Earths2009，27，5： | 4 |
| 15 | Optical characteristics of Ce,Eu:YAG single crystal grown by Czochralski method显示文摘Eu-doped Ce:YAG single crystal(SC) was fabricated by the Czochralski method. The crystal structure,optical and photoelectric property of the constructed w-LED was investigated. The XRD and HRTEM results show that YAG crystal structure has little change when Eu^(3+), Ce^(3+) are doped. Absorption spectra and photoluminescence spectra show that the Ce,Eu:YAG single crystal can effectively absorb the 460 nm blue light to form a broadband emission center at 530 nm, decay curves of the crystal show that the energy transfer between Ce^(3+) and Eu^(3+) is highly suppressed. Compared with commercial Ce:YAG phosphor, Ce,Eu:YAG exhibits better thermal stability. | Jingfeng Zhang Guorui Gu Xiaoxuan Di Weidong Xiang Xiaojuan Liang | 2019 | Journal of Rare Earths2019，37，2： | 4 |
| 16 | Chemical stability, thermal behavior, and shelf life assessment of extruded modified double-base propellants显示文摘Double base propellant suffers from lack of chemical stability; this could result in self ignition during storing. Modified double base(MDB) propellant based on stoichiometric binary mixture of oxidizermetal fuel(Ammonium perchlorate/Aluminum), and energetic nitramines(HMX) offered enhanced thrust as well as combustion characteristics. This study is devoted to evaluate the impact of such energetic additives on thermal behavior, chemical stability, and shelf life. Extruded MDB formulations were manufactured by extrusion process. Artificial aging at 80℃ for 28 days was conducted. Shelf life assessment was performed using Van't Hoff's equation. Quantification of evolved NOxgases with aging time was performed using quantitative stability tests. MDB formulation based on HMX demonstrated extended service life of 16 years compared with(AP/Al)-MDB which demonstrated 9 years. This finding was ascribed to the reactivity of AP with nitroglycerin with the formation of perchloric acid. Thermal behavior of aged MDB, exhibited an increase in heat released with time; this was ascribed to the autocatalytic thermal degradation during artificial aging. The increase in released heat by 31% was found to be equivalent to evolved NOx gases of 6.2 cm^3/5 g and 2.5 cm^3/1 g for Bergmann-Junk test, and Vacuum stability test respectively. This manuscript shaded the light on a novel approach to quantify evolved NOx gases to heat released with aging time. MDB based on HMX offered balanced ballistic performance,chemical stability, and service life. | Sherif Elbasuney Ahmed Fahd Hosam E.Mostafa Sherif F.Mostafa Ramy Sadek | 2018 | Defence Technology(防务技术)2018，14，1： | 4 |
| 17 | Synthesis of Cerium-containing Polymethylphenyl Silicone and Its Antioxidant Effect on Fluorosilicone Rubber显示文摘As an essential elastomer used in edge technologies, fluorosilicone rubber(FSR) suffers serious oxidative ageing problem when serving at high temperature. Cerium oxide is generally used as an antioxidant additive but remains unsatisfactory. In order to obtain better antioxidant effect on improving the thermal stability of FSR, a kind of cerium-containing polymethylphenyl silicone(PSI-Ce) was synthesized and the structure was verified by Fourier-transform infrared spectroscopy(FTIR) and proton nuclear magnetic resonance(1HNMR). Due to the homogeneous dispersion on molecular scale, PSI-Ce imposed much better antioxidant effect than the commercial CeO2 did, no matter from isothermal degradation at 320 ℃ or thermal-oxidative ageing test at 230 ℃. In particular, after ageing for 72 h,FSR/PSI-Ce(2 phr) maintained 82% of tensile strength and 63% of elongation at break, in comparison to the corresponding values of 48%and 42% for FSR/CeO2(2 phr). Moreover, 2 phr PSI-Ce was equivalent to 0.046 phr CeO2 according to cerium element conservation. | Yong Guan Jian Hu Yong-Kang Huang Yang You Huan-Yao Zhang An-Na Zheng Xiang Xu Da-Fu Wei | 2019 | Chinese Journal of Polymer Science2019，37，8： | 4 |
| 18 | Superior performance and high service stability for Ge Te-based thermoelectric compounds显示文摘GeTe-based compounds have been intensively studied recently due to their superior thermoelectric performance,but their real applications are still limited so far due to the drastic volume variation that occurs during the rhombohedral–cubic phase transition,which may break the material or the material/electrode interface during service.Here,superior performance and high service stability for GeTe-based thermoelectric compounds are achieved by co-doping Mg and Sb into GeTe.The linear coefficient of thermal expansion before phase transition is greatly improved to match that after phase transition,yielding smooth volume variation around the phase transition temperature.Likewise,co-doping(Mg,Sb)in GeTe successfully tunes the carrier concentration to the optimal range and effectively suppresses the lattice thermal conductivity.A peak z T of 1.84 at 800 K and an average z T of 1.2 in 300–800 K have been achieved in Ge0.85Mg0.05Sb0.1Te.Finally,a Ni/Ti/Ge0.85Mg0.05Sb0.1Te thermoelectric uni-leg is fabricated and tested,showing quite good service stability even after 450 thermal cycles between 473 K and 800 K.This study will accelerate the application of GeTe-based compounds for power generation in the mid-temperature range. | Tong Xing Qingfeng Song Pengfei Qiu Qihao Zhang Xugui Xia Jincheng Liao Ruiheng Liu Hui Huang Jiong Yang Shengqiang Bai Dudi Ren Xun Shi Lidong Chen | 2019 | National Science Review2019，6，5： | 4 |
| 19 | Improving Thermal Stability of BaMgAl_(10)O_(17):Eu Phosphor显示文摘Heterogeneous precipitation method was used to prepared surface coating on self-made BaMgAl10O17:Eu phosphor. Results illustrate that the coating film can be silicon dioxide in amorphous state with 50 nm in thickness. Photoluminescence results indicate that the coating layer presents an observable improved effect on the enhancement of thermal stability. When baked at 600 ℃ for 1 h, the luminance of coated BAM keeps at 92% higher than that of uncoated BAM by 23%. This protective effect can be attributed to the high compact degree and uniformity of this amorphous SiO2 coating film which is served as a diffusion block layer to inbreak oxygen atom, thus releases the oxidation extent of Eu2+ effectively. | 梁超 张超 董岩 曹同 蒋建清 何锦华 | 2006 | Journal of Rare Earths2006，24，z2： | 4 |
| 20 | SECOND PHASES OF RAPIDLY SOLIDIFIED AlFeCrZrVSi ALLOY AND THEIR THERMAL STABILITIES显示文摘SECONDPHASESOFRAPIDLYSOLIDIFIEDAlFeCrZrVSiALLOYANDTHEIRTHERMALSTABILITIESXiaoYudeLiSongruiLiWenxianZengZhihuaMaZhengqing(Depa... | Xiao Yude Li Songrui Li Wenxian Zeng Zhihua Ma Zhengqing(Department of Materials Science and Engineering,Central South University of Technology, Changsha 410083, China) | 1998 | Journal of Central South University1998，10，1： | 4 |
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