巻号一覧
60 巻, 2 号
February
選択された号の論文の6件中1～6を表示しています
- |<
- <
- 1
- >
- >|
研究論文
研究ノート
-
高橋 佑典, 高橋 清造, 山田 正2013 年 60 巻 2 号 p. 41-48
発行日: 2013/02/15
公開日: 2013/03/30
ジャーナル オープンアクセスA production of sintered compact with a square shaped cup is formed from alumina granule admixed with liquid paraffin could form by flow compaction. The powder flows from the bottom to the wall. In the case of single-action tooling by changing the bottom thickness, the maximum sintered density was 96.2 % in relative density by addition of liquid paraffin 12.5 mass%, compacting pressure of 150 MPa and the bottom thickness of 5 mm. The minimum difference of the width dimension of the sintered compact was 0.16 mm. In the case of floating die tooling by changing wall height, the maximum sintered density was 98.2 % in relative density by addition of liquid paraffin 12.5 mass%, compacting pressure of 100 MPa and wall height of 20 mm. The minimum difference of the width dimension of sintered compact was 0.07 mm, the value of which reached to an industrial revel. In comparison between the single-action tooling and the floating die tooling, the latter causes combining powder flow and double-action pressing effects. As a result of floating die tooling, the density of sintered compact becomes higher and the difference in width dimension of the sintered compact can be reduced.抄録全体を表示PDF形式でダウンロード (742K)
研究論文
-
Yusuke MORIGUCHI, Xiangeng MENG, Koji FUJITA, Shunsuke MURAI, Katsu ...2013 年 60 巻 2 号 p. 49-54
発行日: 2013/02/15
公開日: 2013/03/30
ジャーナル オープンアクセスA synthesis procedure of gold-silica core-shell nanoparticles has been developed in this work. We have investigated the effects of the amounts of poly(vinylpyrrolidone) (PVP), water, and tetraethoxysilane (TEOS) in the starting materials on the shell thickness. The results reveal that the modification of the surface of gold nanoparticles with PVP plays a critical role in the formation of smooth coating with silica. The shell thickness can be well controlled by changing the amounts of water and TEOS, typically ranging from 2 to 25 nm. We have examined optical extinction properties experimentally and numerically; our experimental results are consistent with the calculations.抄録全体を表示PDF形式でダウンロード (1645K) -
Oxygen Release Property of Ceria/Alumina Composite Powder in Reducing Atmosphere at Low TemperaturesMasatomo HATTORI, Masaaki HANEDA , Masakuni OZAWA2013 年 60 巻 2 号 p. 55-59
発行日: 2013/02/15
公開日: 2013/03/30
ジャーナル オープンアクセスOxygen release property of ceria (CeO2) in ceria/alumina composite powder by hydrogen was examined by the temperature-programmed reduction technique below the temperature of 600 °C. The results suggested the strong interaction and the structural relaxation at the interface of CeO2 and Al2O3 after the redox treatment at low temperatures. The activation energy of oxygen release by hydrogen was determined as 85 ± 15 kJ/mol for the interface of CeO2/Al2O3. Furthermore it increased to 194 ± 25 kJ/mol after the redox treatment, because oxygen was stabilized at the interface between alumina and ceria. This means that the interface is stabilized to produce the relaxed structure of interface in which oxygen is also stabilized.抄録全体を表示PDF形式でダウンロード (692K) -
菅原 靖, 國廣 洋平, 杉山 重彰, 布田 潔2013 年 60 巻 2 号 p. 60-65
発行日: 2013/02/15
公開日: 2013/03/30
ジャーナル オープンアクセスTiO2 - based compacts were fabricated by Spark Plasma sintering using starting powder mixtures of TiO2 and TiN. Here, the TiN mol fraction, m mol%, was varied as m = 0, 1, 3, 5, 8, 10, 12, and 20. The phases of the compacts were found to be a rutile phase for m = 0 and 1, whereas those to be a defective phase, TiO1.93, for m = 3, and Magneli phases, TinO2n−1 (n = 5, 6, 7, 8, 9, 10), for m = 5 through 20. The electrical conductivity, σ, reached the maximum value of 6.6 × 104 Sm−1 at 50 °C for the compact with m = 12. The Seebeck coefficient were found to be negative for all the compacts, and the maximum of the absolute value was recorded to be 760 µVK−1 at 50 °C for m = 0. The minimum value of thermal conductivity, κ, was found to be 2.2 Wm−1K−1 at 50 °C for m = 5 and 8. The dimensionless figure of merit, ZT, was found to increase with temperature, reaching the maximum of 0.24 at 800 °C for m = 10.抄録全体を表示PDF形式でダウンロード (649K)
解説
-
－パーコレーション現象による熱電性能向上の可能性－勝山 茂, 田中 敏宏2013 年 60 巻 2 号 p. 66-72
発行日: 2013/02/15
公開日: 2013/03/30
ジャーナル オープンアクセスIn the composite composed of high electrical conductivity and low electrical conductivity materials the percolation phenomenon is often observed; the electrical conductivity of the composite is maintained low before the volume fraction of the high electrical conductivity component reaches at a specific value (percolation threshold), and over the percolation threshold, the electrical conductivity of the composite rapidly increases. On the other hand, such percolation phenomenon is not generally observed in the thermal conduction. We have pointed out a possibility of the enhancement of the performance of thermoelectric materials by the application of the percolation phenomenon. We have synthesized the sintered skutterudite CoSb3 composed of coarse and fine crystal grains (with a bimodal distribution of crystal grains) and investigated its thermoelectric properties. The experimental result was discussed from the point of view of the percolation theory.抄録全体を表示PDF形式でダウンロード (1666K)
本会記事
-
2013 年 60 巻 2 号 p. Pref2_1-
発行日: 2013/02/15
公開日: 2013/03/30
ジャーナル オープンアクセスPDF形式でダウンロード (61K)
- |<
- <
- 1
- >
- >|