Home Browse Just accepted

Just accepted

Accepted, unedited articles published online and citable. The final edited and typeset version of record will appear in the future.
Please wait a minute...
  • Select all
  • Qi Guo; Shun-Xin GE;
    The surface tension and viscosity of mixed molten salt KNO3-NaNO2 were studied in the temperature range from 190℃~250℃. The method of curve fitting was used for analyzing the results. The study shows that the surface tension of mixed molten salt KNO3-NaNO2 is linearly correlative to the temperature. The viscosity is non-linearly correlative to the temperature. As the temperature rises, the surface tension and viscosity are both decreased. As the mass ratio of KNO3 rises, the surface tension is decreased while the viscosity is increased.
  • Hao Li;
    Lyophobic surfaces have extremely broad application prospects in industrial production and daily life, and have very important significance on the preventing adhesive of materials, anti-fouling, and prolonging service life. In this article, lyophobic surface on X70 pipeline steel was fabricated successfully via the combination of shot peening, chemical etching, and low energy modification. The surface morphology, chemical composition, and wettability were studied by scanning electron microscope, confocal microscope, energy dispersive X-ray spectrometer, and contact angle tester. The results show that, the lyophilic surfaces with micro-nano structure changed into lyophobic or super-lyophobic surfaces after modified with low energy materials, and the maximum contact angles of distilled water and peanut oil were 150 ° and 140 °, respectively.
  • Quanguo Huang
    In this paper, polystyrene/paraffin microcapsules were prepared by suspension-like polymerization. Its chemical structure, morphology, latent heat and thermal stability of these microcapsules were investigated by using Fourier transform infrared spectrophotometer(FT-IR), scanning electron microscope (SEM), differential scanning calorimetry (DSC) and thermogrametric analysis (TG). The results indicated that the shell materials were not reacted with core materials during preparation of microcapsules, and holes with different diameter were discovered on the surface of microcapsules. When the content of paraffin was less than 50 wt%, microcapsules could be well covered by shell materials. Microcapsules were irregular when the mass ratio of paraffin was up to 60 wt%. The highest latent heat of microcapsules investigated by DSC is 92.4J/g, which was less than the counted value. The prepared polystyrene/paraffin microcapsules could be used as a kind of materials for energy storage.
  • Wan-Zhong QIN
    Abstract : The injection molding of magnetic powder could cost-effectively mass-produce net shape magnets. The manufacture technology and properties testing method of composite powder and bonded NdFeB magnets from injection molding were described in detail. The effects of content of binder, additives and magnetic powder on the magnetic property, mechanical property and fluidity of injection molding magnets were investigated. Furthermore, the effect mechanism was revealed microcosmically. The injection molding bonded magnets were prepared by using the MQP-B rapidly quenching NdFeB magnetic powder and polyamide 12. The magnetic properties are :Br=0.539T, Hcb=345.37kA/m, Hci=681.02kA/m, and (BH)max=47.37kJ/m3.
  • Tao Huang Bo Wu Jia-Gang WU Chao LIU Jian-Guo ZHU
    Lead-free (0.995-x)K0.48Na0.52NbO3-0.005BiCoO3-xBi0.5Na0.5ZrO3 (KNN-0.005BC-xBNZ, x=0~0.045) piezoelectric ceramics were fabricated by conventional solid-state technique, and the effect of the Bi0.5Na0.5ZrO3 content on the phase structure and electrical properties of KNN-based ceramics were investigated. It was found that the addition of BNZ can shift the transition temperature of orthogonal-tetragonal phases (TO-T) to a lower temperature and the transition temperature of rhombohedral-orthogonal phases (TR-O) to a higher temperature. As a result, the ceramics with the compositions of 0.03
  • Chen LIU;;
    Ultrasonic spray pyrolysis(USP)is a newly developing method for preparing coated conductor in recent years. It has the advantages of low cost, non-vacuum and fast deposition. This paper makes an elaboration on the basic process of USP technology and a comprehensive review on the recent progress of preparing coated conductor, and holds some expectations to its developing prospect.
  • 功能材料.
    Hexagonal Na(Y1.5Na0.5)F6:Eu3+ phosphors are synthesized by a simple hydrothermal method. At 300 K, the phosphors produce twelve emission peaks at the range of 460 ~ 720 nm when excited by 394 nm near ultraviolet radiation, corresponding to the 5Dn (n = 0, 1, 2) → 7FJ (J = 1, 2, 3, 4) transitions of Eu3+ ions, respectively. The main wavelength of emission spectra is 590 nm with color saturation of 0.97. When the temperature of sample is raised to 420 K, only little color shifting is observed. Through fitting the relational curves  and , the thermal activation energy is calculated to be 0.324 eV. So good thermal stability means Na(Y1.5Na0.5)F6:Eu3+ phosphors are suitable for the bonding of power devices. After coating SiO2 on surface of the particles, an enhanced luminescence is obtained. But the fluorescence enhancement strongly depends on the thickness of SiO2 shell. A model on competition between enhancement and quenching is used to explain the  phenomenon.