粉体工学会誌
Online ISSN : 1883-7239
Print ISSN : 0386-6157
ISSN-L : 0386-6157
53 巻, 5 号
2015年度秋期研究発表会特集
選択された号の論文の6件中1~6を表示しています
論文
  • 古谷 彰平, 奥住 明日香, 中野 裕美
    2016 年 53 巻 5 号 p. 276-280
    発行日: 2016/05/10
    公開日: 2016/05/27
    ジャーナル フリー
    We attempted to use the Ba0.79Al10.9O17.14 as a host material for a new phosphor. Doping of Eu2+ was achieved by annealing the Eu2O3-containing materials under 97% Ar - 3% H2 reductive atmosphere. The phosphors of (Ba1-xEux)0.79Al10.9O17.14 were synthesized with the x-values ranging from 0.05 to 0.16 to determine the Eu2+ ion concentration for highest photoluminescence (PL) intensity. The phosphors emitted the blight blue-green-color, in which the broad emission spectrum was observed in the wave range of 450~550 nm when excited by ultraviolet light at around 329 nm. One of the phosphors with x=0.1 showed the highest PL intensity. TEM images of the specimens with x-values of 0 and 0.12 were observed and the composition of each grain was measured by EDS. The results showed that the hexagonal structure has an antiphase-domain boundaries along the [100] direction and the PL intensity is closely related to crystal structure.
  • 村上 剛史, 大塚 智子, 野﨑 祐介, 山下 計成, 箱守 正志, 迫 和博
    2016 年 53 巻 5 号 p. 281-285
    発行日: 2016/05/10
    公開日: 2016/05/27
    ジャーナル フリー
    We evaluated the quantitative discharge behavior of pharmaceutical granules of top, middle, and bottom layer in a hopper, using granules including an active pharmaceutical ingredient. Behavior of granules was clarified using tracer particles with different size and colors.
    We developed novel method for which could prevent percolation segregation when particles are discharged from a hopper. Pharmaceutical granules were found to be normally discharged in order from bottom to top layers. However, when the "rings" was installed inside the hopper, we could change the powder flow to discharge top-layer granules preferentially.
  • 内田 宗宏, 堤 武司, 鈴木 啓之, 上坊 和弥, 鈴木 豊, 野村 誠治, 齋藤 公児, 道古 義治, 大高 円, 木本 政義, 牧野 ...
    2016 年 53 巻 5 号 p. 286-293
    発行日: 2016/05/10
    公開日: 2016/05/27
    ジャーナル フリー
    It is known that oxidation rate of coal is roughly related to coal rank. Recently, the amount of low rank coal (semi soft caking coal) which we utilize is increasing in coking process. It is important to develop how to stock coal safely in indoor hopper for steel industries. In this paper, to investigate the influence of the sample mass and atmosphere temperature for the evaluation of self-heating characteristics for coals, three experiments (used sample mass at each of experiments was a few grams, a few kilograms and a few hundred of kilograms) were performed. These two results were obtained. 1) The effect of sample mass is very sensitive to the rate of self-heating. 2) The adiabatic apparatus for evaluation system of self-heating characteristics on coal is needed.
  • 田中 諭, 永澤 嘉浩, 加藤 善二
    2016 年 53 巻 5 号 p. 294-300
    発行日: 2016/05/10
    公開日: 2016/05/27
    ジャーナル フリー
    The motion of particles in concentrated slurry was observed directly by using a confocal laser scanning microscopy. For observation of particles inside a slurry, the silica particles were dispersed into a glycerol solution, so that the slurry shows transparency. In this study, the two types of slurries were prepared for examining the influence of the diameter distributions of particles on the rheological measurement. A slurry was consisted of mono-dispersed silica particles, another contained mono-dispersed particles with small amount of poly-dispersed particles. The mono-dispersed slurry showed a shear-thinning behavior. In the observed images, the particles in the slurry flowed at the same rate with keeping the particle-coordinated structures. The mixed slurry containing small amount of poly-dispersed particles also showed shear-thinning, but the viscosity becomes considerably higher. The slip stick phenomena of due to co-existence of the large particles and small particles were observed. The rotating behavior of particles was also observed. This indicated that this phenomena increase the viscosity.
研究ノート
  • 鈴木 翔太, 衣 雪梅, 牛 晶, 秋山 友宏
    2016 年 53 巻 5 号 p. 301-305
    発行日: 2016/05/10
    公開日: 2016/05/27
    ジャーナル フリー
    We studied Combustion Synthesis (CS) of Si3N4 from a mixture of Si powder with/without NaCl and Si3N4 as diluent at pressurized nitrogen. The effect of premixing before CS on reaction temperature, α-Si3N4 content, and grain shapes of CSed products was mainly examined. As a result, with prolonging premixing time, α-Si3N4 content of the products increased to 84% under the conditions of 30 mass% NaCl additive and 120 min premixing. As the premixing time prolonged, the reaction temperature also increased slightly and the particle size of product decreased obviously. From these results, the effect mechanism of NaCl on the CS reaction was finally derived, in which the longer premixing time caused larger contact area between Si and NaCl as the raw materials. When the surface of Si particle is highly coated by NaCl, α-Si3N4 can be synthesized firstly due to the lower reaction temperature caused by the melting and evaporation of NaCl. Therefore, the increase of premix time improves the dispersion of NaCl on Si Surface, thereby restrains the phase transformation of α-Si3N4 to β-Si3N4 and meanwhile restricts the grain growth occurring at high temperature period.
  • 洲本 高志, 前田 裕貴, 小川 貴弘, 赤坂 剛
    2016 年 53 巻 5 号 p. 306-309
    発行日: 2016/05/10
    公開日: 2016/05/27
    ジャーナル フリー
    Quantitative laser diffraction method (qLD) is the extended technology of laser diffraction method to evaluate particle size distribution as a relationship between particle diameter and number concentration of particles dispersed in medium. qLD method can be applied to the concentration evaluations for various applications of particle size analysis for protein aggregates and fine bubbles.
    In addition, qLD method can monitor the time changes of concentration such as aggregation process of protein.
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