共查询到20条相似文献,搜索用时 15 毫秒
1.
The synthesis of nanostructured TiC-TiB2 by self-propagating high-temperature synthesis (SHS) has been investigated by using carbon nanotubes as precursor materials in partial substitution of graphite according to the following reaction: 6Ti + B4C + (3−x)C + x CNT → 4TiC + 2TiB2.Different amounts of CNTs addition have been studied in order to achieve structural refinement of the SHS products. The CNT molar content was varied in order to define the optimal composition, which allows to obtain nanostructured TiC-TiB2 powders morphologically homogenous.The optimized composition has been chosen for the further densification step. The Pressure Assisted Fast Electric Sintering (PAFES) technique gave bulk composites with ultrafine grained microstructure. The mechanical characterization showed very high hardness and good fracture toughness values if compared to literature data. 相似文献
2.
Guihua Peng Guojian Jiang Hanrui Zhuang Wenlan Li Suying Xu 《Materials Research Bulletin》2005,40(12):2139-2143
β-Si3N4 whiskers with diameter of 0.5–2 μm and aspect ratio of 10–15 have been successfully prepared by combustion synthesis under 30–50 atm nitrogen pressure. The addition of MgSiN2 powder plays a significant role in the growth of β-Si3N4 whiskers. The as-prepared products were characterized by X-ray powder diffraction (XRD) and scanning electron microscopy (SEM). 相似文献
3.
Xin Qing Wang Liang Li Ning Jie Chu Ya Pi Liu Hong Xiao Jin Hong Liang Ge 《Materials Research Bulletin》2009,44(2):422-425
The lamellar Fe/Al2O3 catalysts were prepared by sol-gel method, and then with these prepared catalysts, carbon nanotubes (CNTs) were synthesized by catalytic chemical vapor deposition (CCVD) method using C2H2 as precursor. The as-prepared CNTs and Fe/Al2O3 catalysts were characterized by X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy, high-resolution transmission electron microscopy and Raman spectrum. The results proved that the as-prepared CNTs actually existed in bundles. And the growth of CNTs bundles should be attributed to the lamellar catalysts, which supported the bottom growth mechanism of CNTs. The transition metal of Mo was not introduced in catalysts to produce CNTs bundles, which was different with others’ results. 相似文献
4.
Large-scale ear-like Si3N4 dendrites were prepared by the reaction of SiO2/Fe composites and Si powders in N2 atmosphere. The product was characterized by field emission scanning electron microscopy, X-ray diffraction, and transmission electron microscopy. The results reveal that the product mainly consists of ear-like Si3N4 dendrites with crystal structures, which have a length of several microns and a diameter of 100-200 nm. Nanosized ladder-like Si3N4 was also obtained when changing the Fe content in the SiO2/Fe composites. The Si3N4 nanoladders have a length of hundreds nanometers to several microns and a width of 100-300 nm. The ear-like Si3N4 dendrites are formed from a two-step growth process, the formation of inner stem structures followed by the epitaxial growth of secondary branches. 相似文献
5.
Jayesh D. Patel 《Materials Research Bulletin》2009,44(8):1647-11504
A simple solution growth method for synthesis of nanocomposite of PbS nanoparticles in poly(vinyl-pyrrolidone) (PVP) polymer is described. The nanocomposite is prepared from methanolic solution of lead acetate (PbAc), thiourea (TU) and PVP at room temperature (∼27 °C). Optical absorption spectrum of PbS/PVP nanocomposite solution shows strong absorption from 300 to 650 nm with significant bands at 400 and 590 nm which is characteristic of nanoscale PbS. Spin-coated nanocomposite films on glass have an absorption edge at ∼650 nm with band gap of 2.55 eV. Fourier transform infrared (FTIR) spectroscopy of PbS/PVP nanocomposite and PVP shows strong chemical bond between PbS nanoparticles and host PVP polymer. The transmission electron microscope (TEM) images reveal that 5-10 nm PbS particles are evenly embedded in PVP polymer. The formation of PbS is confirmed by selective area electron diffraction (SAED) of a typical nanoparticle. 相似文献
6.
Micrometer-sized flower-like Cu/polyvinylpyrrolidone (PVP) architectures are synthesized by the reduction of copper (II) salt with hydrazine hydrate in aqueous solution in the presence of PVP capping agent. The resulting Cu/PVP architectures are investigated by UV-vis spectroscopy, transmission electron microscopy (TEM), X-ray powder diffraction (XRD), and scanning electron microscopy (SEM). The Cu/PVP flowers have uniform morphologies with an average diameter of 10 μm, made of several intercrossing plates. The formation of Cu/PVP flowers is a new kinetic control process, and the factors such as the amount of N2H4H2O, reaction temperature, molar ratio of CuCl2 to PVP and molecular weight of PVP have significant effect on the morphology of Cu/PVP architectures. A possible mechanism of the formation of micrometer Cu/PVP architectures was discussed. 相似文献
7.
Kiyoshi Okada Miho Tanuma Yoshikazu Kameshima Shigeo Asai 《Materials Research Bulletin》2009,44(2):298-8747
CaSiO3/high-density polyethylene (HDPE) composites with flexibility and biocompatibility were prepared by a new surface loading method. CaSiO3 powder was synthesized by coprecipitation method with heating at 1300 °C for 2 h. The obtained α-CaSiO3 powder was sieved to 45-75 μm (sample M) and 75-150 μm (sample C). Fine powder sample (sample F) was prepared by grinding the powder being the average particle size of 2.9 μm. These powders were sprinkled on the melted HDPE sheets heated at 160, 180 and 200 °C. The amounts of sprinkled powder were only <0.1 vol.% but the ratios of surface coverage area were >50% in all the samples. Apatite formation in simulated body fluid (SBF) was observed by soaking for 5 days in sample F while within 1 day in samples M and C. The sample M retained flexible properties of HDPE together with excellent biocompatible properties. 相似文献
8.
Uniform submicron BiMn2O5 particles were prepared via a facile one-step hydrothermal route at low temperature. Bi(NO3)3, MnCl2·4H2O and KMnO4 were used as starting materials; KOH as a pH adjustor and also as a mineralizer. Single-crystalline orthorhombic BiMn2O5 sample with controllable morphology was obtained. The microstructure strongly depends on the molar ratio of the starting materials, KOH concentration and reaction temperature. X-ray photoelectron spectroscopy shows the existence of Mn4+ state. Magnetic measurement indicates Néel temperature TN at 44 K. The susceptibility above TN obeys the Curie-Weiss law, χ = C/(T − θ), with θ = −350 K. The effective paramagnetic moment μeff = 4.66 μB/Mn, demonstrating the coexistence of mixed Mn3+ and Mn4+ valences. 相似文献
9.
The TiO2/SiO2 composite hollow spheres (CHSs) with hydrophobic inner surface have been successfully synthesized by using carboxyl-functionalized polystyrene spheres as templates. The inner titania shell was selectively modified with stearic acid (SA). The morphologies, structures, drug loading amounts and release rates were characterized and investigated by SEM, TEM, XRD, N2 adsorption-desorption isotherms, FT-IR, TG and HPLC analysis. Due to the hydrophobic interaction, the modified inner surface slowdown the release of the hydrophobic drug into the aqueous environment. The SA modified CHSs displayed higher drug loading amounts as well as lower release rates than that of unmodified spheres. The studies demonstrate that composite hollow spheres are promising for the multifunctional controlled release. 相似文献
10.
D. Nihtianova N. Velichkova R. Nikolova I. Koseva A. Yordanova V. Nikolov 《Materials Research Bulletin》2011,46(11):2125-2130
Nanosized aluminum tungstate Al2(WO4)3 was prepared by co-precipitation reaction between Na2WO4 and Al(NO3)3 aqueous solutions. The powder size and shape, as well as size distribution are estimated after different conditions of powder preparation. The purity of the final product was investigated by XRD and DTA analyses, using the single crystal powder as reference. Between the specimen and the reference no difference was detected. The crystal structure of Al2(WO4)3 nanosized powder was confirmed by TEM (SAED, HRTEM). In additional, TEM locality allows to detect some W5O14 impurities, which are not visible by conventional X-ray powder diffraction and thermal analyses. 相似文献
11.
Atiye Nekahi 《Materials Research Bulletin》2011,46(9):1377-1383
Preparation of titanium diboride (TiB2) nanoparticles was carried out by volume combustion synthesis. TiO2, B2O3 and elemental Mg were mixed with 0-60% salt mixture of KCl, NaCl and CaCl2 with increment of 15% as a low melting temperature diluent. Compressed samples were synthesized in a tubular furnace at a constant heating rate under argon atmosphere. Thermal analysis of the process showed that the addition of the low melting temperature salts mixture led to a significant decrease in ignition and combustion temperatures. Synthesized samples were then leached by nitric and hydrochloric acids to remove impurities. The samples were examined by XRD, SEM and DLS analysis. The results showed the formation of fine deagglomerated particles with the addition of the salts mixture. The results revealed that 45% salts mixture had the smallest average particle size of about 90 nm. 相似文献
12.
Hydrated amorphous FePO4 was synthesized by a sonochemical reaction method, in which a solution of (NH4)2HPO4 and FeSO4·7H2O was irradiated by an ultrasonic wave. From this material, two kinds of cathode materials were easily prepared: (1) an amorphous sample prepared by heating at 350 °C and (2) a crystalline sample prepared by heating at 700 °C. Both samples consisted of homogeneous sub-micron particles. The amorphous sample of FePO4 exhibited high discharge capacities with more than 100 mAh g−1 in the range of 3.9-2.0 V versus Li/Li+ at a current rate of 0.2 C. The sonochemical synthesis proposed herein has the following advantages: no use of oxidation agents for production of trivalent iron ions, reduction in reaction time, control of particle size, and enlargement in surface area for the preparation of the cathode material. 相似文献
13.
Silvera Scaccia Maria CarewskaPawel Wisniewski Pier Paolo Prosini 《Materials Research Bulletin》2003,38(7):1155-1163
Microstructural variations of amorphous FePO4 and LiFePO4 (the latter obtained by chemical lithiation of the former) as a result of the annealing temperature have been studied by Thermogravimetric Analysis (TGA)/Differential Thermal Analysis (DTA), chemical analysis, Brunauer-Emmet-Taylor (BET) and Scanning Electron Microscopy (SEM) techniques. Round-shaped amorphous FePO4 particles 40-80 nm in size are obtained after heating (at 400 °C) amorphous FePO4·2H2O in air (previously prepared by a precipitation route). On further heating at 650 °C, in air, crystalline trigonal FePO4 of crystallite size <200 nm is formed. Round-shaped amorphous LiFePO4 particles 40-80 nm in size crystallize by heating at 550 °C in Ar+5%H2 for 3 h. After thermal treatment, LiFePO4 particles are interconnected by necks, which resembled a sintering process. The particle size of LiFePO4 increases with an increase of temperature up to 750 °C, but an abnormal growth is evident at annealing temperatures above 650 °C. DTA analysis showed two exothermic peaks at 547 and 768 °C for FePO4 due to phase transitions, whereas for LiFePO4 two exothermic effects at 496 and 567 °C are shown. 相似文献
14.
Electrochemically anodized TiO2 nanotube (NT) arrays on Ti foils have been in great interests recently attributing to the wide applications. The net growth rate of TiO2 NT array is determined by electrochemical etching of Ti foil and chemical dissolution of the formed TiO2 NTs. While the TiO2 NT growth becomes a diffusion controlled process after certain growth time. Here, we report the influence of ultrasound on the growth process of TiO2 NT arrays. The results indicate that ultrasound can significantly alter the relative rates of these reactions and adjust the geometries of the TiO2 NT arrays. 相似文献
15.
S. Mula 《Materials Research Bulletin》2009,44(5):1154-4356
An investigation on the structure of an ultrasonically cast nanocomposite of Al with 2 wt.% nano-sized Al2O3 (average size ∼10 nm) dispersoids showed that the nanocomposite was consisting of nearly continuous nano-alumina dispersed zones (NDZs) in the vicinity of the grain boundaries encapsulating Al2O3 depleted zones (ADZs). The mechanical properties were investigated by nanoindentation and tensile tests. The nano-sized dispersoids caused a marginal increase in the elastic modulus, and a significant increase in the hardness (∼92%), and tensile strength (∼48%). Subsequent cold rolling to achieve a reduction ratio of 2 resulted in an appreciable increase in the hardness due to change in morphology of the microstructure. Estimation of the strength on the basis of inter-particle spacing, which was measured by transmission electron microscopy, could not be accounted for on the basis of Orowan mechanism, and therefore, strengthening mechanisms like local climb and/or cross slip might have a role in this room temperature (0.32TM) deformation process. 相似文献
16.
Ke Geng 《Materials Research Bulletin》2004,39(6):873-879
Titanium matrix composites reinforced with TiB and Y2O3 were prepared by a non-consumable arc-melting technology. X-ray diffraction (XRD) was used to identify the phases in the composites. Microstructures of the composites were observed by means of optical microscope (OM), scanning electron microscope (SEM), and transmission electron microscope (TEM). The results show that there are two kinds of reinforcements formed in the titanium matrix, needle-shaped TiB and Y2O3 with near-equiaxed and dendritic shape. The interfaces between reinforcements and titanium are clear and there is no evidence of interfacial reaction. The hardness of the composites decreases with the increasing contents of yttrium in the composite. 相似文献
17.
Opportunities on combustion synthesizing the MoSi2-SiC ceramic composites in a wide range of compositions under the chemical activated mode were studied. Molybdenum, silicon powders and carbon black were used as initial reagents, and Teflon was used as an activating additive. It was established that Teflon displays a dual (kinetic and thermal) impact on the interaction between reagents. The phasic character of the combustion process evolution, being characterized by low- and high-temperature regimes, was revealed. The end-products were subjected to SEM, XRD and chemical analyses. 相似文献
18.
Nanocrystalline MgAl2O4 spinel powder was synthesized using metal nitrates and a polymer matrix precursor composed of sucrose and polyvinyl alcohol (PVA). The precursor and the calcined powders were characterized by simultaneous thermal analysis (STA), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), field emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM). According to XRD results, the inceptive formation temperature of spinel via this technique was between 600 and 700 °C. The calcined powder at 800 °C for 2 h has faced shaped morphology and its crystallite size is in the range of 8-12 nm. Further studies also showed that the amount of polymeric matrix to metal ions has significant influence on the crystallite size of synthesized magnesium aluminate spinel powder. 相似文献
19.
Porous TiO2-based nanofiber was fabricated via a combined electrospinning and alkali-dissolution method. TiO2/SiO2 composite nanofiber was firstly prepared by electrospinning and sintering, and then silica was leached out with alkaline solution from the bulk of TiO2/SiO2 composite nanofiber to produce porous microstructure. The thermal decomposition and phase structure of the composite nanofiber precursor was investigated with TG/DSC and XRD, and optimal sintering temperature was obtained. SEM-EDX and FT-IR characterization show that most silica can be dissolved out from the composite nanofiber and thus porous nanofiber with excellent microstructure can be spontaneously formed. The effect of composite nanofiber composition on porous microstructure was studied, and it is found that the composite nanofiber with 20wt% silica can produce better porous microstructure compared to those with 10wt% and 30wt% silica. Meanwhile, porous TiO2 nanofiber with 20wt% silica shows higher degradation efficiency to Congo Red. 相似文献
20.
Hydrothermal synthesis in the presence of sucrose has been carried out at 200 °C and autogeneous pressure in the system CaO-SiO2-C12H22O11-H2O to investigate the influence of C12H22O11 on phase formation and the crystal habit of calcium silicate hydrates (CSH-phases). A sucrose/lime ratio of 0.5 was utilized in all experiments and the reactivity of the SiO2 source was varied using educts of different grain size of ∼40 mesh and >230 mesh. CaO/SiO2 concentration ratios of 0.5 and 0.8 have been selected, the latter with respect to the composition of the important CSH-phase 11 Å tobermorite. The results were compared with experiments under similar but sucrose-free conditions. X-ray powder diffraction (XRD), scanning electron microscopy (SEM) combined with energy dispersive X-ray analysis (EDX-analysis) as well as Fourier transform infrared spectroscopy (FTIR-spectroscopy) have been applied for analyses.A retarding effect of sucrose on CSH-phase formation has been observed. Only minor amount of CSH without regular morphology was observed instead of typically fibrous 11 Å tobermorite formed in the sucrose-free system. Sucrose altered the reaction mechanism in the CSH-system and hydrothermal process started with rapid reaction of sucrose and lime. The further course of crystallization was dominated by an extended precipitation of calcium carbonate and small amounts of calcium oxalate hydrate. Formation of these stable hydrothermal decomposition products of saccharated lime is strongly suppressing the CSH-crystallization. 相似文献