期刊：
Materialwissenschaft und Werkstofftechnik,2010年41(10):869-874 ISSN：0933-5137
通讯作者：
Dang, K.
作者机构：
[Dang, K.] Beijing Univ Chem Technol, Coll Mech & Elect Engn, Beijing 100029, Peoples R China.;[Ye, C.; Kuang, J.] Changsha Univ Sci & Technol, Inst Mat Sci & Engn, Changsha 410076, Hunan, Peoples R China.;[Fu, D.] Cent Res Inst Bldg & Construct, MCC, Beijing 100088, Peoples R China.;[Fu, H.; Huang, L.; Dang, K.] Xi An Jiao Tong Univ, Xian 710049, Shaanxi Prov, Peoples R China.;[Dang, K.] Beijing Univ Chem Technol, Coll Mech & Elect Engn, POB 80,15 BeiSanhuan E Rd, Beijing 100029, Peoples R China.
通讯机构：
[Dang, K.] B;Beijing Univ Chem Technol, Coll Mech & Elect Engn, POB 80,15 BeiSanhuan E Rd, Beijing 100029, Peoples R China.
关键词：
Medium carbon steel;Boron;Quenching temperature;Boron carbide;Mechanical property;Wear resistance;Kohlenstoffstahl;Bor;Abschrecktemperatur;Borkabid;mechanische Eigenschaften;Verschleißwiderstand
摘要：
Under the condition of oil cooling, the effect of quenching temperatures on the structure and abrasive wear resistance of medium carbon steel containing 2% B has been studied. The results show that the metallic matrix of Boron-containing Medium Carbon Steel (BMCS) transforms into the martensite from the mixture of martensite, pearlite and ferrite while quenching at 900°C - 1050°C. The change of boron carbide existing in BMCS is few in different quenching temperature. After quenching the hardness of BMCS excels 56 HRC, and the change of quenching temperature has no obvious effect on the hardness of BMCS. The increase of quenching temperature leads to the increase of impact toughness, and impact toughness has no obvious change when quenching temperature exceeds 1000°C. Moreover, the increase of quenching temperature leads to a slight decrease of weight loss and the abrasive wear resistance of BMCS has a slight increase while increasing quenching temperature. Quenching at 1000°C-1050°C BMCS has excellent comprehensive property. Copyright 2010 WILEY-VCH Verlag GmbH &Co. KGaA, Weinheim.
摘要：
Nanocrystalline iron-cobalt-vanadium alloy was fabricated by Equal-Channel Angular Pressing (ECAP). Microstructural evolution at different passes of ECAP and the effect of φ in the ECAP were researched. The results revealed that a phase slowly turned to γ phase and followed the form of dislocation cells in the iron-cobalt-vanadium alloy with the increase of severe plastic deformation. At last, it became reasonably finer bands of subgrains. The results with intersect at an angle φ of 90° was better than with at an angle φ of 120°. After three passes of ECAP, at an angle φ of 90°, the nanocrystalline microstructure could be obtained. The grain size was reduced from 30 μm in the initial state to 400nm.
作者机构：
School of Energy and Thermal Power Engineering, Changsha University of Science and Technology, Chang;School of Materials Science and Engineering, Changsha University of Science and Technology, Changsha
会议名称：
第六届煤燃烧国际会议(The 6th International Symposium on Coal Combustion)
会议时间：
2007-12-01
会议地点：
武汉
会议论文集名称：
第六届煤燃烧国际会议(The 6th International Symposium on Coal Combustion)论文集
关键词：
weak reduction and air atmospheres;corundum based refractory;slagging;SEM
摘要：
In this paper, ash of Yungui coal was selected for its low deformation temperature (DT is about 1120℃). Two samples of 0.6g the ash of Yungui coal were put on the corundum based refractories first, then they were laid in a muffle furnace for sintering experiments, which were made at 1250℃ for 5 hours under air atmosphere and weak reduction atmospheres respectively. After the experiments, the samples were cooled down naturally to room temperature, then a scanning electron microscopy (SEM) with energy dispersive spectrometer (EDS) was carried out for investigating the microscopic structure of the slagging sintered on the corundum based refrectory board under weak reduction and air atmospheres. Accordingly, the following conclusions can be made from the analysis: (1) at 1250℃, the slagging sintered on the corundum based refractory under weak reduction atmosphere was quite tight, while the slagging sintered under air atmosphere was rather loose and no evident penetration into the refractory was observed; (2) atmospheres in the muffle furnace had a great effect on the slagging of melted coal ash on the refractories through changing the transformation forms of the mineral components (such as Fe) in coal ash; (3) the corundum based refractory implies a good slagging resistance effect by avoiding reasonably the forming of weak reduction atmosphere in furnaces during boilers operation.
摘要：
Carbon nanotubes/taper zinc oxide composite powdrs were prepared by refluxing using zinc chloride as raw material and ammonia as precipitator. The morphology, structure and optical property of composite powdrs were charactered by scanning electron microscopy (SEM), X-ray diffraction (XRD) and flourescence spectra. The experimental results show that the ultraviolet emission peaks at 354 tun are observed by the combination with carbon nanotubes and taper zinc oxide. Moreover, the intensity of ZnO characteristic peaks are reduced with increasing refluxing time, and the intensity of ultraviolet emission peaks at 354 nm is evidently improved.
作者机构：
[Fu, H. -G.] Beijing Univ Technol, Res Inst Adv Mat Proc Technol, Sch Mat Sci & Engn, Beijing 100022, Peoples R China.;[Kuang, J. C.] Changsha Univ Sci & Technol, Dept Mat Sci & Engn, Changsha 410076, Hunan, Peoples R China.;[Bai, G. -Q.] Alloy Casting Factory Linyuan, Linyuan 122401, Liaoning Prov, Peoples R China.;[Wang, L. -T.] China Off, Italy SOS Grp, Beijing 100037, Peoples R China.
通讯机构：
[Fu, H. -G.] B;Beijing Univ Technol, Res Inst Adv Mat Proc Technol, Sch Mat Sci & Engn, Beijing 100022, Peoples R China.
关键词：
Medium carbon steel;Bainite;Microstructure;Mechanical property;Wear resistance;Hammer
期刊：
Journal of Power Sources,2009年189(1):507-510 ISSN：0378-7753
作者机构：
South Africa institute for Advanced Materials Chemistry, University of the Western Cape, Bellville 7535, South Africa;Institution of Materials Science and Engineering, Department of Physics and Electronic Sciences, Changsha University of Science and Technology, Changsha 410076, China
关键词：
LiNi_(0.5)Mn_(1.5)O_4;spinel;cathode materials;lithium ion battery
摘要：
LiNi_(0.5)Mn_(1.5)O_4 was prepared through a solid-state reaction using various Ni precursors. The effect of precursors on the electrochemical performance of LiNi_(0.5)Mn_(1.5)O_4 was investigated. LiNi_(0.5)Mn_(1.5)O_4 made from Ni(NO_3)_2·6H_2O shows the best charge-discharge performance. The reversible capacity of LiNi_(0.5)Mn_(1.5)O_4 is about 145 mAhg~(-1) and remained 143 mAhg~(-1) after 10 cycles at 3.0-5.0 V. The XRD results showed that the precursors and the dispersion methods had significant effect on their phase purity. Pure spinel phase can be obtained with high energy ball-milling method and Ni(NO_3)_2·6H_2O as precursor. Trace amount of NiO and Li_2MnO_3 phase were detected in LiNi_(0.5)Mn_(1.5)O_4 with manual-mixture method and using Ni(CH_3COO)_2·6H_2O, NiO and Ni_2O_3 as precursors.
摘要：
The developed 1Cr18Ni9Ti austenitic stainless steel containing 1.63 wt.%B have been characterized by X-ray diffraction (XRD), electron probe microanalyzer (EPMA), optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and Vickers microhardness measurement. The microstructural evolution and property of high boron stainless steel after solution treatment at the temperature of 1050°c are also investigated. The results show that the main compositions of borides are Fe, Cr and B, and with small amount of Ni, Mn and C elements. Silicon is insoluble in the borides. The hardness of borides is over 1,500 HV. It has been found that borides do not decompose during solution treatment, but part of borides dissolves into the matrix. The effect of increasing the solubility of boron element in the austenitic matrix favours the hardness enhancement by 8.54%. High boron stainless steel has excellent wear resistance in corrosive environment. Lifetime of transfer pipe made of high boron-containing stainless steel is 1.5-1.8 times longer than that of boron-free 1Cr18Ni9Ti stainless steel.
作者机构：
[Xiao, Hanning; Sun, Tao; Liu, Huabin] Hunan Univ, Coll Mat Sci & Engn, Changsha 410082, Hunan, Peoples R China.;[Xiao, Hanning; Cheng, Yin] Changsha Univ Sci & Technol, Coll Mat Sci & Engn, Changsha 410076, Hunan, Peoples R China.
通讯机构：
[Xiao, Hanning] H;Hunan Univ, Coll Mat Sci & Engn, Changsha 410082, Hunan, Peoples R China.
关键词：
D. Alkaline earth oxide;D. B2O3–Al2O3–SiO2 glass-ceramics;Crystallization kinetics;Microstructure
摘要：
The effects of MO (MBa, Mg, Ca) on the crystallization of B2O3–Al2O3–SiO2 glass-ceramics were investigated by means of differential scanning calorimetry (DSC), X-ray diffraction (XRD), scanning electron microscopy (SEM) and dilatometer. MO can effectively facilitate the formation of B2O3–Al2O3–SiO2 glass which is influenced by the ratio of B2O3/SiO2, and the crystallization capacity of the glass turns to weaker with the decreasing of B2O3/SiO2 ratio. The main crystal phase is Al4B2O9 when the glass is heat-treated at 800 °C, and Al4B2O9 phase could transfer into Al18B4O33 with the heat-treated temperature increasing to 1100 °C. The calculation of crystallization activation energy (E) shows that crystallinity follows the order of CaO < MgO < BaO, and the Avrami parameter n is higher than 4, which indicate the crystallization of B2O3–Al2O3–SiO2 glass to be bulk nucleation with three-dimensional crystal growth. The addition of MO has evident effects on the main crystalline phase and the morphology of the crystals.
摘要：
Carbon nanotube (CNT)/maleic acid anhydride (MAH)-grafted polypropylene (PP) composites were prepared by in situ grafting method. Infrared spectroscopy showed that the CNTs were linked to PP by MAH grafting. The microstructures and calorimetry analysis indicated that the crystallization behaviors of the filled and unfilled PP were quite different. The addition of CNTs dramatically reduced the spherulite size, increased crystallization rate and improved the thermal stability of PP. These results confirmed the expected nucleant effect of CNT on the crystallization of PP. Scanning and transmission electron microscopy showed that the CNTs were dispersed homogeneously, indicating that the original CNT bundles were separated into individual tubes by the grafting.
