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铁合金的等离子炉冶炼
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作者 王曙生 《铁合金》 北大核心 1989年第5期52-53,共2页
等离子冶炼在铁合金生产中显示了优越性。已对铬铁和锰铁生产及其粉矿冶炼进行了试验。冶炼铬铁和锰铁的传统方法是在矿热炉内以碳热还原法进行的。电热等离子技术比电弧埋弧生产工艺优越的具体表现如下: 1.可不用价格高的块矿,能够处... 等离子冶炼在铁合金生产中显示了优越性。已对铬铁和锰铁生产及其粉矿冶炼进行了试验。冶炼铬铁和锰铁的传统方法是在矿热炉内以碳热还原法进行的。电热等离子技术比电弧埋弧生产工艺优越的具体表现如下: 1.可不用价格高的块矿,能够处理粉精矿; 2.可用价廉质低的煤作还原剂。 展开更多
关键词 铁合金 等离子 冶炼 电热等离子
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电热消融毛细管几何参数放电实验研究 被引量:2
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作者 戴荣 栗保明 宁广炯 《弹道学报》 CSCD 北大核心 2000年第2期88-91,共4页
在电热化学 (ETC)发射系统中 ,作为等离子发生器的工作元件 ,毛细管的几何参数是影响系统电热转换效率 ,以及等离子体与膛内工质作用效果的主要因素之一 .本文通过在高、低两种电能水平以及不同管径下 ,对多种长度的消融毛细管作发生器... 在电热化学 (ETC)发射系统中 ,作为等离子发生器的工作元件 ,毛细管的几何参数是影响系统电热转换效率 ,以及等离子体与膛内工质作用效果的主要因素之一 .本文通过在高、低两种电能水平以及不同管径下 ,对多种长度的消融毛细管作发生器放电实验 ,详细分析了在不同电能水平下 ,负载稳态阻抗、峰值电流。 展开更多
关键词 电热化学炮 等离子体发生器 毛细管
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氟化电热蒸发ICP-AES直接测定茶叶中痕量元素 被引量:4
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作者 陈世忠 吴新明 《武汉工业学院学报》 CAS 2001年第3期13-15,共3页
以聚四氟乙烯悬浮体为氟化剂 ,对悬浮体制样电热蒸发电感耦合等离子体原子发射光谱法 (ETV -ICP -AES)直接测定茶叶中的痕量元素La、Yb、Y、Cu、Cr的蒸发行为及主要影响因素进行了研究。在优化实验条件下 ,方法的检出限为 2 .0~ 15 .3n... 以聚四氟乙烯悬浮体为氟化剂 ,对悬浮体制样电热蒸发电感耦合等离子体原子发射光谱法 (ETV -ICP -AES)直接测定茶叶中的痕量元素La、Yb、Y、Cu、Cr的蒸发行为及主要影响因素进行了研究。在优化实验条件下 ,方法的检出限为 2 .0~ 15 .3ng/ml,相对标准偏差(RSD)为 2 .3%~ 4 .0 %。本法用于茶叶标样 (GBW 0 760 5 )中痕量元素直接测定 ,结果与参考值基本一致。 展开更多
关键词 氟化剂 茶叶 痕量元素 电热蒸发电感耦合等离子体原子发射光谱法 ETV—ICP—AES
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固体电热化学炮一维模型的耦合研究
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作者 孙江生 刘志明 +1 位作者 王莹 吕艳梅 《弹道学报》 CSCD 北大核心 2000年第3期46-49,54,共5页
在固体电热化学炮 ( SPETCG)的内弹道计算过程中 ,人们多把等离子体源以电能的形式或以带修正系数的内能项直接结合到火炮内弹道零维模型上进行简化计算 .本文从固体电热化学炮内弹道一维模型出发 ,在适当假设的前提下推导出了一维耦合... 在固体电热化学炮 ( SPETCG)的内弹道计算过程中 ,人们多把等离子体源以电能的形式或以带修正系数的内能项直接结合到火炮内弹道零维模型上进行简化计算 .本文从固体电热化学炮内弹道一维模型出发 ,在适当假设的前提下推导出了一维耦合模型 ,使其对内弹道耦合过程以更精确的描述 ,并对其该模型计算的结果进行了讨论 . 展开更多
关键词 电热发射 内弹道 数值模拟 等离子
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纳米TiO_2材料分离富集、悬浮体进样氟化辅助ETV-ICP-AES直接分析痕量稀土元素 被引量:9
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作者 杭义萍 秦永超 +1 位作者 江祖成 胡斌 《高等学校化学学报》 SCIE EI CAS CSCD 北大核心 2003年第11期1980-1983,共4页
以纳米 Ti O2 为吸附材料分离富集了稀土离子 Y,Yb,Eu,La,Dy,Tm,Sm,Ho,Nd和 Pr,研究了其吸附性能 ,并将吸附于纳米 Ti O2 上的稀土离子直接制成悬浮体 ,用氟化辅助电热蒸发等离子体原子发射光谱 ( FETV-ICP-AES)进行检测 ,考察了上述稀... 以纳米 Ti O2 为吸附材料分离富集了稀土离子 Y,Yb,Eu,La,Dy,Tm,Sm,Ho,Nd和 Pr,研究了其吸附性能 ,并将吸附于纳米 Ti O2 上的稀土离子直接制成悬浮体 ,用氟化辅助电热蒸发等离子体原子发射光谱 ( FETV-ICP-AES)进行检测 ,考察了上述稀土离子的蒸发行为 .结果表明 ,基体元素可与待测物在灰化阶段完全分离 ,在优化的实验条件下 ,检出限和 RSD结果均与文献值基本一致 . 展开更多
关键词 纳米材料 TiO2 分离富集 悬浮体 痕量元素 稀土元素 进样 氟化辅助电热蒸发等离子体原子发射光谱 吸附材料
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Microstructure and mechanical properties of Ti-45Al-5.5(Cr,Nb,B,Ta) alloy sintered at different SPS temperatures 被引量:2
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作者 肖树龙 徐丽娟 +2 位作者 于宏宝 田竟 陈玉勇 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第12期2960-2964,共5页
TiAl alloy bulk samples with the composition of Ti-45Al-5.5(Cr,Nb,B,Ta) (mole fraction, %) were prepared by high energy mechanical milling and spark plasma sintering (SPS) and then heat treatment. The microstructure a... TiAl alloy bulk samples with the composition of Ti-45Al-5.5(Cr,Nb,B,Ta) (mole fraction, %) were prepared by high energy mechanical milling and spark plasma sintering (SPS) and then heat treatment. The microstructure and mechanical properties after heat treatment of TiAl alloy prepared by SPS at different temperatures were studied. The results showed that the morphology of high energy mechanically milled powder was irregular and the average grain size was about decades micrometers. X-ray diffraction analysis showed that the mechanically milled powder was composed of two phases of TiAl and Ti3Al. The main phase of TiAl and few phases of Ti3Al and TiB2 were observed in the SPS bulk samples of Ti-45Al-5.5(Cr,Nb,B,Ta) alloy. For samples sintered at 900 °C and 1000 °C, the microstructure was duplex structure with some fine equiaxed gamma grains and thin needly TiB2 phases. With the SPS temperature increasing from 900 °C to 1000 °C, the micro-hardness was changed little, the compression strength increased from 1812 MPa to 2275 MPa and the compression ratio increased from 22.66% to 25.59%. The fractography results showed that the compression fracture transform of the SPS Ti-45Al-5.5(Cr,Nb,B,Ta) alloy was rgranular rupture. 展开更多
关键词 TiAl alloy powder metallurgy spark plasma sintering (SPS) heat treatment
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用ETV-ICP-MS研究Cr、Ni、Zr、Nb、Yb在石墨炉中的蒸发/原子化机理 被引量:4
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作者 李胜清 胡斌 江祖成 《分析科学学报》 CAS CSCD 2005年第5期473-480,共8页
本文以电热蒸发电感耦合等离子体质谱(ETV-ICP-MS)为手段,探讨了Cr、Ni、Zr、Nb和Yb在石墨炉中的蒸发/原子化机理;比较了不同化学改进剂存在条件下,Cr、Ni、Zr、Nb和Yb的蒸发行为和在石墨炉原子吸收(GFAAS)中的原子化行为;考察了石墨炉... 本文以电热蒸发电感耦合等离子体质谱(ETV-ICP-MS)为手段,探讨了Cr、Ni、Zr、Nb和Yb在石墨炉中的蒸发/原子化机理;比较了不同化学改进剂存在条件下,Cr、Ni、Zr、Nb和Yb的蒸发行为和在石墨炉原子吸收(GFAAS)中的原子化行为;考察了石墨炉温度和ICP功率等实验参数对上述元素发射强度及轮廓的影响。结果表明,Pd和Mg化合物的存在对Cr、Ni、Zr、Nb和Yb的蒸发/原子化行为没有明显的化学改进作用;然而,以聚四氟乙烯(PTFE)为化学改进剂时,可显著改善Cr、Ni、Zr、Nb和Yb的蒸发行为,避免难熔碳化物的形成,降低待测物的蒸发温度;对Cr和Ni的GFAAS信号强度略有增强;但是,由于Yb、Nb和Zr氟化物的离解键能很高,难以离解/原子化,PTFE的存在反而降低了Yb、Nb和Zr在GFAAS中的信号强度。 展开更多
关键词 电热蒸发电感耦合等离子体质谱 石墨炉原子吸收 PTFE 蒸发/原子化行为
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Microstructure and magnetic properties of anisotropic Nd-Fe-B magnets prepared by spark plasma sintering and hot deformation 被引量:3
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作者 李小强 李力 +3 位作者 胡可 陈志成 屈盛官 杨超 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第10期3142-3151,共10页
Bulk anisotropic Nd-Fe-B magnets were prepared from hydrogen-disproportionation-desorption-recombination(HDDR) powders via spark plasma sintering(SPS) and subsequent hot deformation. The influence of sintering tem... Bulk anisotropic Nd-Fe-B magnets were prepared from hydrogen-disproportionation-desorption-recombination(HDDR) powders via spark plasma sintering(SPS) and subsequent hot deformation. The influence of sintering temperature on the structure and magnetic properties of the spark plasma sintered Nd-Fe-B magnets were studied. The remanence Br, intrinsic coercivity Hcj, and the maximum energy product(BH)max, of sintered Nd-Fe-B magnets first increase and then decrease with the increase of sintering temperature, TSPS, from 650 °C to 900 °C. The optimal magnetic properties can be obtained when TSPS is 800 °C. The Nd-Fe-B magnet sinter treated at 800 °C was subjected to further hot deformation. Compared with the starting HDDR powders or the SPS treated magnets, the hot-deformed magnets present more obvious anisotropy and possess much better magnetic properties due to the good c-axis texture formed in the deformation process. The anisotropic magnet deformed at 800 °C with 50% compression ratio has a microstructure consisting of well aligned and platelet-shaped Nd2Fe14 B grains without abnormal grain growth and exhibits excellent magnetic properties parallel to the pressing axis. 展开更多
关键词 Nd-Fe-B magnet hydrogen-disproportionation-desorption-recombination(HDDR) spark plasma sintering hot deformation magnetic property
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Properties and microstructure of Cu/diamond composites prepared by spark plasma sintering method 被引量:11
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作者 陶静梅 朱心昆 +2 位作者 田维维 杨鹏 杨浩 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第10期3210-3214,共5页
Cu/diamond composites have been considered as the next generation of thermal management material for electronic packages and heat sinks applications. Cu/diamond composites with different volume fractions of diamond we... Cu/diamond composites have been considered as the next generation of thermal management material for electronic packages and heat sinks applications. Cu/diamond composites with different volume fractions of diamond were successfully prepared by spark plasma sintering(SPS) method. The sintering temperatures and volume fractions(50%, 60% and 70%) of diamond were changed to investigate their effects on the relative density, homogeneity of the microstructure and thermal conductivity of the composites. The results show that the relative density, homogeneity of the microstructure and thermal conductivity of the composites increase with decreasing the diamond volume fraction; the relative density and thermal conductivity of the composites increase with increasing the sintering temperature. The thermal conductivity of the composites is a result of the combined effect of the volume fraction of diamond, the homogeneity and relative density of the composites. 展开更多
关键词 Cu/diamond composites spark plasma sintering relative density thermal conductivity
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Effect of mechanical alloying and sintering process on microstructure and mechanical properties of Al-Ni-Y-Co-La alloy 被引量:4
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作者 原燕波 王志伟 +3 位作者 郑瑞晓 郝晓宁 Kei AMEYAMA 马朝利 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第7期2251-2257,共7页
Al86Ni7Y4.5Co1La1.5 (mole fraction, %) alloy powder was produced by argon gas atomization process. After high-energy ball milling, the powder was consolidated by vacuum hot press sintering and spark plasma sintering... Al86Ni7Y4.5Co1La1.5 (mole fraction, %) alloy powder was produced by argon gas atomization process. After high-energy ball milling, the powder was consolidated by vacuum hot press sintering and spark plasma sintering (SPS) under different process conditions. The microstructure and morphology of the powder and consolidated bulk sample were examined by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). It is shown that amorphous phase appears when ball milling time is more than 100 h, and the bulk sample consolidated by SPS can maintain amorphous/ nanocrystalline microstructure but has lower relative density. A compressive strength of 650 MPa of Al86Ni7Y4.5Co1La1.5 nanostructured samples is achieved by vacuum hot extrusion (VHE). 展开更多
关键词 mechanical alloying aluminum alloy nanocrystalline alloy AMORPHOUS spark plasma sintering hot extrusion
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Improving tribological and thermal properties of Al alloy using CNTs and Nb nanopowder via SPS for power transmission conductor 被引量:1
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作者 Chika O.UJAH Patricia POPOOLA +2 位作者 Olawale POPOOLA Victor AIGBODION Philip OLADIJO 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2020年第2期333-343,共11页
This study aimed at improving the tribological and thermal properties of Al alloy using CNTs and Nb nanopowder as reinforcements and spark plasma sintering(SPS)as the fabrication method.The SPS was conducted at 630℃,... This study aimed at improving the tribological and thermal properties of Al alloy using CNTs and Nb nanopowder as reinforcements and spark plasma sintering(SPS)as the fabrication method.The SPS was conducted at 630℃,30 MPa,10 min,and 200℃/min.The tribology test was run with ball-on-disc tribometer using steel ball as the counter body.And the thermal test was processed with thermogravimetric analyzer(TGA)and laser flash apparatus(LFA).Results showed that the addition of 8 wt.%CNTs and 8 wt.%Nb reinforcements respectively decreased the coefficient of friction(COF)of the composite by 79%.The wear volume of the composite was decreased by 23%,and so was the wear rate.However,the thermal conductivity of the composite was equally improved by 44%.The tribology improvement was stimulated by a C film generated by CNTs and a protective Nb2O5 formed by Nb nanopowder.The thermal conductivity was improved by the grain refining property of Nb and the high thermal conductivity of CNTs.Therefore,these results indicated that Al-CNTs-Nb composite is a robust material for high transmission conductor capable of reducing sag and ensuring the durability of the composite. 展开更多
关键词 TRIBOLOGY thermal conductivity spark plasma sintering Al-CNTs-Nb composite coefficient of friction
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ICRF Heated Long-Pulse Plasma Discharges in LHD 被引量:6
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作者 R. KUMAZAWA T. SEKI +54 位作者 T. MUTOH K. SAITO T. WATARI Y. NAKAMURA M. SAKAMOTO T. WATANABE S. KUBO T. SHIMOZUMA Y. YOSHIMURA H. IGAMI Y. TAKEIRI Y. OKA K. TSUMORI M. OSAKABE K. IKEDA K. NAGAOKA O. KANEKO J. MIYAZAWA S. MORITA K. NARIHARA M. SHOJI S. MASUZAKI M. GOTO T. MORISAKI B. J. PETERSON K. SATO T. TOKUZAWA N. ASHIKAWA K. NISHIMURA H. FUNABA H. CHIKARAISHI T. NOTAKE Y. TORII H. OKADA M. ICHIMURA H. HIGAKI Y. TAKASE H. KASAHARA F. SHIMPO G.NOMURA C.TAKAHASHI M.YOKOTA A. KATO 赵燕平 J. S. YOON J. G. KWAK H. YAMADA K. KAWAHATA N. OHYABU K. IDA Y. NAGAYAMA N. NODA A. KOMORI S. SUDO O. MOTOJIMA 《Plasma Science and Technology》 SCIE EI CAS CSCD 2006年第1期28-32,共5页
A long-pulse plasma discharge for more than 30 min. was achieved on the Large Helical Device (LHD). A plasma of ne = 0.8 × 10^19 m^-3 and T10 = 2.0 keV was sustained with PICH = 0.52 MW, PECH = 0.1 MW and avera... A long-pulse plasma discharge for more than 30 min. was achieved on the Large Helical Device (LHD). A plasma of ne = 0.8 × 10^19 m^-3 and T10 = 2.0 keV was sustained with PICH = 0.52 MW, PECH = 0.1 MW and averaged PNBI = 0.067 MW. Total injected heating energy was 1.3 G J, which was a quarter of the prepared RF heating energy. One of the keys to the success of the experiment was a dispersion of the local plasma heat load to divertors, accomplished by shifting the magnetic axis inward and outward. 展开更多
关键词 helical/stellarator configuration ICRF heating steady state operation
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(2+1)-Dimensional Electron Acoustic Solitary Waves in an Unmagnetized Collisionless Plasma with Vortex-Like Hot Electrons
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作者 LIN Mai-Mai DUAN Wen-Shan 《Communications in Theoretical Physics》 SCIE CAS CSCD 2007年第2期339-342,共4页
In this paper, (2+1)-dimensional electron acoustic waves (EAW) in an unmagnetized collisionless plasma have been studied by the linearized method and the reductive perturbation technique, respectively. The disper... In this paper, (2+1)-dimensional electron acoustic waves (EAW) in an unmagnetized collisionless plasma have been studied by the linearized method and the reductive perturbation technique, respectively. The dispersion relation and a modified Kadomtsev-Petviashvili (KP) equation have been obtained for the EAW in the plasma considering a cold electron fluid and a vortex-like hot electrons. It is found from some numerical results that the parameter β(the ratio of the free hot electron temperature to the hot trapped electron temperature) effects on the amplitude and the Width of the electron acoustic solitary waves (EASW). It can be indicated that the free hot electron temperature and the hot trapped electron temperature have very important effect on the characters of the propagation for the EASW. 展开更多
关键词 electron acoustic solitary wave vortex-like hot electrons reductive perturbation method
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Isolated 4-20 mA Current-Loop System in the Experiment of Coal Pyrolysis in H-plasma Producing Acetylene
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作者 沈洁 罗家融 +3 位作者 陈龙威 孟月东 舒兴胜 方世东 《Journal of Donghua University(English Edition)》 EI CAS 2009年第5期519-521,共3页
The purpose of this paper is to demonstrate a systematic approach to design high performance signal conditioning circuits,and to show how to implement the 4-20 mA analog current-loop transmitter and receiver circuits ... The purpose of this paper is to demonstrate a systematic approach to design high performance signal conditioning circuits,and to show how to implement the 4-20 mA analog current-loop transmitter and receiver circuits by using isolation amplifier.The basic principle and typical applicable circuits of the 4-20 mA current loop isolation chip T1100N,the current-limiting circuit and filter circuit are presented.And the experimental testing data of the circuits are analyzed. 展开更多
关键词 signal isolation coal pyrolysis plasma torch
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Effects of various sintering methods on microstructure and mechanical properties of CP-Ti powder consolidations
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作者 Je-ha SHON Jong-moon PARK +3 位作者 Kyeong-sik CHO Jae-keun HONG Nho-kwang PARK Myung-hoon OH 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第S1期59-67,共9页
Effects of various sintering methods such as spark plasma sintering(SPS), hot pressing(HP) and electric resistance sintering(ERS) on the microstructure and mechanical properties of commercial pure titanium(CP-Ti) powd... Effects of various sintering methods such as spark plasma sintering(SPS), hot pressing(HP) and electric resistance sintering(ERS) on the microstructure and mechanical properties of commercial pure titanium(CP-Ti) powder consolidations with particle size of <147 μm, <74 μm and <43 μm were studied. The smaller particle powders are densified to proceed at a higher rate. Dense titanium with relative density up to 99% is found to take place at 850 °C under 30 MPa of SPS and HP condition. However, in case of ERS, CP-Ti powders were densified almost at 950 °C under 30 MPa. The microstructure of sintered titanium is composed of equiaxed grains at 850-950 °C. The yield strength of sintered body composed of <43 μm powder is 858 MPa by using SPS at 850 °C under 30 MPa. When there is a higher content of small particle, the higher yield strength value is obtained both by using SPS and HP. However, when ERS is introduced, the highest yield strength is 441 MPa at 950 °C under 30 MPa, which shows much lower values than those by SPS and HP methods. ERS method takes much less sintering time compared with SPS and HP. Nevertheless, higher sintering temperature results in lower strength and elongation because of brittle fracture. 展开更多
关键词 CP-Ti powders sintering method spark plasma sintering hot pressing electrical resistance sintering
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Organotemplate-free Hydrothermal Synthesis of SUZ-4 Zeolite: Influence of Synthesis Conditions 被引量:1
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作者 周华兰 吴雅静 +1 位作者 张伟 王军 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2014年第1期120-126,共7页
Various conditions were investigated in detail for the novel organic template-free static hydrothermal synthesis of SUZ-4 zeolite in the presence of seeds. The obtained samples were characterized by XRD (X-ray diffra... Various conditions were investigated in detail for the novel organic template-free static hydrothermal synthesis of SUZ-4 zeolite in the presence of seeds. The obtained samples were characterized by XRD (X-ray diffraction), SEM (scanning electron microscope), TG (thermal gravimetric analysis), ICP (inductively coupling plasma) elemental analysis, nitrogen sorption isotherm and surface area. The results show that pure SUZ-4 zeolites with high crystallinity are obtained in a broad window of synthesis conditions: seed mass concentration 0.2%-2%, SIO2/A1203 molar ratio 21 25, KOH/SiO2 molar ratio 0.33 0.43, H20/SiO2 molar ratio 7.14-38.1, aging time 24 h, crystallization temperature 160℃, and crystallization time 6-10 d. Also, crystallinity and size of the rod-like SUZ-4 zeolite crystals are found to alter with the conditions. 展开更多
关键词 crystal growth microporous materials SUZ-4 zeolite zeolite synthesis organic template-free
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Calculation of Dielectric Function of a Quark-Gluon Plasma
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作者 JIANG Bing-Feng LI Jia-Rong 《Communications in Theoretical Physics》 SCIE CAS CSCD 2008年第6期1567-1572,共6页
With the hard thermal loop (HTL) resummation technique, we calculate the dielectric function excited by hard gluon in quark-gluon plasma (QCP). We find that in a section of the space-like region po/p ∈ [0.78, 0.9... With the hard thermal loop (HTL) resummation technique, we calculate the dielectric function excited by hard gluon in quark-gluon plasma (QCP). We find that in a section of the space-like region po/p ∈ [0.78, 0.95], there are two extremum structures on the dielectric function curve, while the dielectric function in the HTL approximation decreases monotonously without these properties. Through the analyses of the imaginary part of the dielectric function, we conclude that the character of the dielectric function in this region reflects effects of the Landau damping. 展开更多
关键词 quark-gluon plasma dielectric function hard thermal loop effective perturbation theory
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The First Principle Formula of the Relativistic Heat Conductivity of Coulomb Electronic Plasmas
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作者 TIANChu-Shun LUQuan-Kang 《Communications in Theoretical Physics》 SCIE CAS CSCD 2001年第5期605-608,共4页
Making use of the relativistic BBGKY technique,the relativistic generalization of Landau collision integral is obtained.Furthermore,we calculate the relativistic hydrodynamic modes up to the second order in the hydrod... Making use of the relativistic BBGKY technique,the relativistic generalization of Landau collision integral is obtained.Furthermore,we calculate the relativistic hydrodynamic modes up to the second order in the hydrodynamic wave number.Combining Résibois' method,we present the first principle formula of the relativistic heat conductivity of Coulomb electronic plasmas for low-order corrections. 展开更多
关键词 relativistic Landau collision integral relativistic correction of heat conductivity Coulomb electronic plasmas
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Enhanced thermoelectric performance of Cu_(12)Sb_4S_(13-δ) tetrahedrite via nickel doping 被引量:2
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作者 Fu-Hua Sun Jinfeng Dong +5 位作者 Shaugath Dey Asfandiyar Chao-Feng Wu Yu Pan Huaichao Tang Jing-Feng Li 《Science China Materials》 SCIE EI CSCD 2018年第9期1209-1217,共9页
Cu12Sb4S13 tetrahedrite has received great attention as an earth-abundant and environmental-friendly thermoelectric material. This work aims to uncover the thermoelectric performance-enhancing effect and the mechanism... Cu12Sb4S13 tetrahedrite has received great attention as an earth-abundant and environmental-friendly thermoelectric material. This work aims to uncover the thermoelectric performance-enhancing effect and the mechanism of nickel doping on tetrahedrite. A series of Cu12-xNixSb4S13-δ(x = 0.5, 0.7, 1.0, 1.5 and 2.0) compounds were synthesized by mechanical alloying combined with spark plasma sintering. It is found that the thermal conductivity sharply reduces with increasing Ni content over the entire temperature range,0.9 W m^-1K^-1, accompanied with an enhanced thermoelectric power factor. The model predicted that the reduced lattice thermal conductivity is attributed to mid-frequency phonon scattering, caused by precipitates and dislocations resulting from Ni doping. Consequently, a high ZT value up to 0.95 at 723 K was achieved for Cu11NiSb4S13-δ, corresponding to a ~46% increase over non-doped Cu12Sb4S13-δ. Furthermore,the cyclic measurement showed that the Ni-doped tetrahedrites displayed high chemical stability. 展开更多
关键词 nickel doping TETRAHEDRITE THERMOELECTRIC
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Hot deformation behaviour and processing maps of AA6061-10 vol. % SiC composite prepared by spark plasma sintering 被引量:1
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作者 LI XiaoPu LIU ChongYu +2 位作者 SUN XiaoWei MA MingZhen LIU RiPing 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2016年第6期980-988,共9页
AA6061-10 vol.% SiC composite was successfully prepared by spark plasma sintering. The deformation behaviour of this composite was studied using the uniaxial compression test, which was conducted at temperatures betwe... AA6061-10 vol.% SiC composite was successfully prepared by spark plasma sintering. The deformation behaviour of this composite was studied using the uniaxial compression test, which was conducted at temperatures between 300 and 500℃ and strain rates between 0.001 and 1 s^-1. Results indicate that the stress-strain curves of the AA6061-10 vol.% SiC composite typically feature dynamic recrystallization. The steady stress can be described by a hyperbolic sine constitutive equation, and the activation energy of the composite is 230.88 kJ/mol. The processing map was established according to the dynamic materials model. The optimum hot deformation temperature is 450-500℃ and the strain rate is 1-0.1 s^-1. The instability zones of flow behaviour can also be identified using the processing map. 展开更多
关键词 AI matrix composite hot deformation processing map stress-strain curves spark plasma sintering
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