作者机构：
[戴晓元; 刘昌斌; 古一; 夏长清] School of Materials Science and Engineering, Central South University, Changsha 410083, China;[戴晓元] School of Materials Science and Engineering, Changsha University of Science and Technology, Changsha 410076, China
通讯机构：
[Dai, X.-Y.] S;School of Materials Science and Engineering, Central South University, China
作者机构：
College of Materials Science and Engineering,Hunan University,Changsha 410082,China;College of Materials Science and Engineering,Changsha University of Science and Technology,Changsha;Department of Materials Science and Engineering,Tsinghua University,Beijing 100084,China
会议名称：
The Fifth China International Conference on High-Performance Ceramics (第五届先进陶瓷国际研讨会(CICC-5))
会议时间：
2007-05-10
会议地点：
长沙
会议论文集名称：
The Fifth China International Conference on High-Performance Ceramics (第五届先进陶瓷国际研讨会(CICC-5))论文集
摘要：
The effect of alkali earth metal oxides MO (M=Mg,Ca,Ba) on the crystallizing behavior and the microstructure of B2O3-Al2O3-SiO2 system (BAS) were studied.DSC,XRD and SEM were used to analyze the crystallization kinetics and to characterize the crystal phases and microstructures of the glass-ceramics.MO can effectively facilitate the formation of BAS glass,and the crystallinity of the glass increases in the order of MgO < BaO < CaO.For one given MO,the crystallinity of the glass is dependent on B2O3/SiO2 ratio:the lower the ratio is,the weaker the crystallinity of the glass will be.It was found that the early crystallization is aluminum metaborate (Al4B2O9) when the glass is heated at 800 ℃,and it would transfer into aluminum borate(Al18B4O33) at temperatures over 1000 ℃.The activation energy and the Avrami exponent of Al4B2O9 were calculated by Ozawa formulation.
摘要：
In order to improve optical property of the multi-walled carbon nanotubes (MWNTs), MWNTs were decorated with europium oxide (Eu2O3) nanoparticles by using co-deposition method. The MWNTs/Eu2O3 composites were examined by XRD, scanning electron microscopy, transmission electron microscopy, and VUV-Vis Luminescence spectroscopy and citric acid (CA) molecules were introduced onto the surface of MWNTs. The results show that there are many oxygenated functional groups on the surface of the MWNTs after the treatment of mixture acid, such as carboxy, hydroxl, carbony and amidocyanogen. The results of electron microscopy illuminate that the MWNTs are coated by nano-europium oxide after annealed at 750 degrees C. The MWNTs/Eu2O3 composite emits much strong red light at about 610 nm under UV excitation.
作者机构：
College of Materials Science and Engineering,Changsha University of Science and Technology,Changsha;National Synchrotron Radiation Laboratory,University of Science and Technology of China,Hefei 230026
会议名称：
2007年国际有色金属大会(International Conference of Nonfereous Materials '2007)(ICNFM)
会议时间：
2007-11-28
会议地点：
长沙
会议论文集名称：
2007年国际有色金属大会（International Conference of Nonfereo
摘要：
In order to improve optical property of the multi-walled carbon nanotubes (MWNTs),MWNTs were decorated with europium oxide (Eu2O3) nanoparticles by using co-deposition method.The MWNTs/Eu2O3 composites were examined by XRD,scanning electron microscopy,transmission electron microscopy,and VUV-Vis Luminescence spectroscopy and citric acid (CA) molecules were introduced onto the surface of MWNTs.The results show that there are many oxygenated functional groups on the surface of the MWNTs after the treatment of mixture acid,such as carboxy,hydroxl,carbony and amidocyanogen.The results of electron microscopy illuminate that the MWNTs are coated by nano-europium oxide after annealed at 750℃.The MWNTs/Eu2O3 composite emits much strong red light at about 610 nm under UV excitation.
摘要：
A new type of wear resistant low carbon Fe–B cast steel with granular borides can be obtained by alloying with titanium and cerium rare earth (RE). As a result, the as-cast eutectic boride structures of Fe–B cast steel are greatly refined and a blocky, less interconnected boride network is obtained from continuous ledeburite. After heat treatment, the boride eutectic in the modified Fe–B cast steel is in the form of a granular boride structure that appears to be isolated particles The guide rollers made of modified low carbon Fe–B cast steel show excellent wear resistance and thermal fatigue resistance in high speed wire mills.
通讯机构：
[Xiao, Hanning] C;Changsha Univ Sci & Technol, Coll Mat Sci & Engn, Changsha 410076, Peoples R China.
关键词：
friction and wear;titanium boride;silicon carbide;elevated temperature
摘要：
Friction and wear tests of TiB2 sliding against SiC were conducted without lubricant from room temperature to 1200 degrees C in air and in vacuum. The friction coefficient of the couple of TiB2/SiC is affected obviously by the oxidation of TiB2. It increases with the increase of temperature and reaches a maximum at some temperature in air, then decreases remarkably. The friction coefficient of TiB2/SiC in vacuum exhibites almost a constant and keeps smaller value than that in air. Transition of TiB2 onto the sliding surface of SiC was observed, which improved the wear resistance of SiC at high temperatures.
作者机构：
[Chen Xiao-hua] Changsha Univ Sci & Technol, Coll Mat Sci & Engn, Changsha 410076, Peoples R China.;[Chen Xiao-hua; Li Wen-hua; Wang Yan-guo; Xu Long-shan; Yang Zhi; Chen Chuan-sheng] Hunan Univ, Coll Mat Sci & Engn, Changsha 410082, Peoples R China.
通讯机构：
[Chen Xiao-hua] C;Changsha Univ Sci & Technol, Coll Mat Sci & Engn, Changsha 410076, Peoples R China.
关键词：
碳纳米管;纳米材料;排列形态;气溶胶
摘要：
A novel aerosol method for the production of alighed carbon nanotubes was presented. Multi-walled carbon nanotubes (MWNTs) with fairly uniform diameters and aligned MWNT bundles were obtained by using solutions of organometallics such as ferrocene in hydrocarbon solvents. A hollow and multi-walled structure was observed with diameter ranging from 15 to 50 nm, leading aspect ratio to be over 200. The quality of the product is dependent on the pyrolysis temperature, carrier gas flow rate and the catalyst precursor concentration. For the sample synthesized at 900 degrees C, G/D is 1.81. G/D of samples obtained at 850 degrees C and 800 degrees C are 1.18 and 0.77, respectively. The inclusion of acetylene to an atomized spray of ferrocene in hexane yield aligned MWNT bundles with a narrow diameter distribution.
作者机构：
College of Materials Science and Engineering,Changsha University of Science and Technology,Changsha;College of Materials Science and Engineering,Hunan University,Changsha 410082,China
会议名称：
2007年国际有色金属大会(International Conference of Nonfereous Materials '2007)(ICNFM)
会议时间：
2007-11-28
会议地点：
长沙
会议论文集名称：
2007年国际有色金属大会（International Conference of Nonfereo
关键词：
aerosol;carbon nanotubes;aligned morphology
摘要：
A novel aerosol method for the production of alighed carbon nanotubes was presented.Multi-walled carbon nanotubes (MWNTs) with fairly uniform diameters and aligned MWNT bundles were obtained by using solutions of organometallics such as ferrocene in hydrocarbon solvents.A hollow and multi-walled structure was observed with diameter ranging from 15 to 50 nm,leading aspect ratio to be over 200.The quality of the product is dependent on the pyrolysis temperature,carrier gas flow rate and the catalyst precursor concentration.For the sample synthesized at 900 ℃,G/D is 1.81.G/D of samples obtained at 850 ℃ and 800 ℃ are 1.18 and 0.77,respectively.The inclusion of acetylene to an atomized spray of ferrocene in hexane yield aligned MWNT bundles with a narrow diameter distribution.
作者机构：
[戴晓元; 华熳煜; 吴茵] School of Materials Science and Engineering, Changsha University of Science and Technology, Changsha 410076, China;[戴晓元; 夏长清; 孙振起] School of Materials Science and Engineering, Central South University, Changsha 410083, China
通讯机构：
School of Materials Science and Engineering, Changsha University of Science and Technology, China
作者机构：
[匡加才] School of Material Science and Engineering, Changsha University of Science and Technology, Changsha 410076, China;[王林涛] China Office, Italy S.O.S. Group, Beijing 100037, China;[符寒光] Key Laboratory for Advanced Manufacturing by Materials Processing Technology, Tsinghua University, Beijing 100084, China
通讯机构：
[Kuang, J.-C.] S;School of Material Science and Engineering, Changsha University of Science and Technology, China
