Papers by Keyword: Preparation Method

Abstract: In the past 20 years, the development of aluminum matrix composites (AMCs) has made a qualitative leap. This article comprehensively introduces the performance characteristics and the preparation methods of aluminum matrix composites. The powder metallurgy method (P/M) is elaborated in detail. And the applications of aluminum matrix composites in aerospace, automobile and other fields are described. Finally, the future development of aluminum matrix composites is prospected.

Abstract: To resolve the problem of weak magnetic field strength of magnetic materials in wastewater treatment, the methods of preparation of magnetic particles was explored. The main influencing factors of magnetic field strength were investigated using single factor experiment. Results suggested that optimal preparation conditions were as follows: 2% silane coupling agent, 12% PVA/ SA, magnetizing time 1 h, and 5% nano Fe₃O₄ powder. Magnetic particles were prepared based on the optimal conditions and the magnetic field strength was 0.85mT.

Abstract: Lanthanum doped barium titanate (BaTiO₃) were studied for high-K dielectric and exhibit a relaxor ferroelectric properties and it can be prepared by using various method. Relaxor ferroelectric offers a wide temperature and frequency range of application for materials with high dielectric constant for microelectronic application. This paper reviews the preparation methods, the important features, advantages and limitation for the lanthanum doped barium titanate. Thus, the phase purity and mixture selected also been review on the second part of the article. The article concludes with a brief discussion of the methods with good dielectric behavior. The objectives of this paper are to determine the selection of suitable preparation methods and the properties of the high-K dielectric based on pure barium titanate and lanthanum doped barium titanate.

Abstract: The a-C:B film were prepared by mixing vapor of hydrocarbon palm oil, boron dopant, carrier gas, and argon in the chamber deposited at -30 V and -50 V of negative bias voltage. The effect of these negative bias voltage on the thickness, electrical and electronic properties of a-C:B film were investigated. It was observed, the optical band gap slightly changed (2.0 eV to 2.04 eV). The fabricated solar cell with the configuration of Au/p-C:B/n-Si/Au achieved conversion efficiency (η) of 0.192% at applied bias voltage of -50 V. This result showed by the applied of negative bias voltage can controlled the interstitial doping of boron in the amorphous carbon films network.

Abstract: Bulk polycrystalline MnGe_xSb_y materials doped with Co or Fe were prepared and investigated with the aim of obtaining new diluted magnetic semiconductor (DMS) materials. An innovative preparation method was also established. Investigation techniques like X-ray diffraction (XRD), Raman scattering, and scanning electron microscopy (SEM) associated with energy dispersive X-ray analysis (EDX) have been employed to derive the structural properties and the composition of the bulk material.

Abstract: Calcium carbonate whisker is a new kind of environmental-friendly inorganic material. Some advantages of calcium carbonate whisker such as low manufacture cost, simple preparation condition and excellent properties draw a lot of attention and make it higher potential competitive in the market. This review summarizes the research progress of calcium carbonate whiskers prepared with the different methods such as carbonation method, metathesis reaction method, sol-gel method, urea hydrolysis method and gravity crystallization method, and describes the research status in diverse applications of calcium carbonate whisker in enforcement of composite materials, being as filler of paper-making and additives in friction materials.

Abstract: The present work reviewed the recent development of preparing LiFePO₄ materials. Solid state method, liquid state method and some rising method were included. The advantages and disadvantages of different methods were compared. And research direction and developing prospect of LiFePO₄ material were pointed out.

Abstract: This paper summarized the basic properties and preparation methods of ultrafine powder, introduced the present situation and progress of ultrafine powder classification technology at home and abroad, also pointed out the application of ultra-fine powder material in the mold manufacturing, biomedical, electronic information, fine ceramics, food industry and coatings.

Abstract: Intelligent hydrogels is as drug carrier, and it has a good application prospect. There are some changes factors in the human environment, such as temperature, pH. Therefore, the temperature sensitive hydrogels and pH sensitive hydrogels can release system for drugs in the body. So the paper detailed descripts a novel MWCNTs good dispersion of PMAA/MWCNTs nanohybrid hydrogels. The introduction of MWCNTs significantly increased the hydrogel pH response and mechanical strength, and depends on the MWCNTs component ratio, particle size and concentration of cross-linking agent. The study found, swelling rate of hybrid hydrogels was faster than the pure PMAA hydrogel, and the swelling behavior were explained. The compression stress-strain experiments should be found, MWCNTs load transfer plays an important role in improving the mechanical properties of the hybrid hydrogels network compression.

Abstract: This paper introduces the classification, properties and application of porous ceramic materials, reviewed preparation of porous ceramics. Taking fly ash and red mud as the main raw material to generate porous ceramics, the paper study the influence of different proportions of raw materials, sintering temperature, porosity of porous ceramic sample rate, bending strength, and microstructure. The results show that, fly ash and red mud proportioning and sintering temperature are the main factors that influence the structure and properties of samples. The 4# sample is a kind of high porosity and high strength quality of porous ceramics.