巻号一覧
62 巻, 10 号
October
選択された号の論文の8件中1～8を表示しています
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研究論文
研究論文
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古嶋 亮一, 下島 康嗣, 細川 裕之, 松本 章宏, 小林 慶三2015 年 62 巻 10 号 p. 497-504
発行日: 2015/10/15
公開日: 2015/11/19
ジャーナル オープンアクセスDry machining tests were performed to evaluate the machinability of ductile cast iron (FCD) with WC-FeAl and WC-Co (K10) cutting tools. Wear-resistant and anti-adhesive properties were compared between the WC-FeAl and WC-Co cutting tools for various cutting conditions. The wear of cutting edge including flank face was mainly observed in the cutting tools after the dry machining of FCD. The cutting edge of the WC-FeAl tool was worn faster than that of the WC-Co tool, which was caused by the weak interfacial strength between binder phase and WC grains. Contrary to the worse wear resistance, the WC-FeAl tool had better anti-adhesive property than the WC-Co tool; the work material hardly adhered to the flank face. α-Al2O3 present on the surface of the WC-FeAl tool may prevent the adhesion of the work material.抄録全体を表示PDF形式でダウンロード (1766K) -
楠瀬 智博, 西山 勝廣2015 年 62 巻 10 号 p. 505-510
発行日: 2015/10/15
公開日: 2015/11/19
ジャーナル オープンアクセスMg is the lightest practical metallic materials, which has specific gravity of 1.74 g/cm3 and is excellent in specific strength. In this study, the powder metallurgy method was applied to make the particle-dispersed composite material with the addition of B4C in Mg-Al by. The effect of manufacturing conditions on the structures and mechanical properties of the sintered body was investigated how to exert its high strength and high functionality as an alloy. The sample composition of Mg-9 %Al and (Mg-9 %Al)–13 %B4C was produced by hot pressing and pressureless resintering. Sintering temperature of 415 °C or 475 °C was adopted as for the hot press, and with the sintering temperature controlled at some temperatures between 500～700 °C. And, some samples were mechanical alloyed. The new alloy we made has following appearances and performances; (1) High strength was exerted by addition of B4C as the reinforcing particles. (2) Mechanical alloyed (Mg-9 %Al)–13 %B4C made by the hot pressed at 475 °C and followed by resintered at 560 °C, showed bending strength of 603 MPa and Rockwell hardness of 100.6 HRH.抄録全体を表示PDF形式でダウンロード (1734K) -
笠井 実, 日比野 敦2015 年 62 巻 10 号 p. 511-518
発行日: 2015/10/15
公開日: 2015/11/19
ジャーナル オープンアクセスIn recent years, in order to better environment harmony performances of industrial products, investigation of vibration control technology of the sintered material is required. In this paper, the vibration dumping behavior of Cu-Sn/Graphite sintered composite material was investigated by a FFT analyzer, and was compared with the microstructure of the sintered composite material.
Cu, Sn, and Graphite powders were used as initial substances. The powders were mixed and pressed into a plate shaped compact with 200 MPa. Using a vacuum furnace, the green compact was sintered at 825–1075 °C for 1 hour. By changing the mixing ratio of the powders and the sintering temperature, some kinds of the composite material plates were produced. For the composite material obtained, microstructure, Vickers hardness, and the vibration dumping behavior were measured.
The composite materials were consisted from the crystal grain of 15–69 μm, and the mixed Graphite particles were dispersed on the grain boundary. Twin crystal was also found in the composite materials. The damping coefficient of composite material depended on the sintering microstructure and twin crystal. Relationship between vibration dumping mechanisms and microstructure was discussed.抄録全体を表示PDF形式でダウンロード (1110K) -
TRAN Thi Thu Hien, Takashi SHIRAI, Masayoshi FUJI2015 年 62 巻 10 号 p. 519-523
発行日: 2015/10/15
公開日: 2015/11/19
ジャーナル オープンアクセスAn amorphous silica powder (A2) was mechanically treated using a planetary type mill. Four different rotation speeds (50, 100, 200, 300 rpm), milling times (15, 30, 60 min) and ball sizes (01, 05, 10 mm) were used. The structure and morphology of the powder did not change by milling. The effect of milling conditions on particle size distribution and specific surface area was investigated. By the milling treatment the original particle size of the powder was not effectively reduced. Rotation speeds of more than 200 rpm and prolonged milling causes the formation of a broad range of particles of larger sizes. The surface activity of raw and treated powders was measured as the amounts of dissolved Si4+ ion into ammonia solution. The 10 mm ball size was the most effective for 200 and 50 rpm rotation speeds almost independently of the milling time. Comparison of the effect of milling conditions on particle features of this powder with previously investigated powder is also discussed. The findings indicate that from a technical and economical point of view each powder has its own optimum milling condition, which will be sufficient to considerably increase the specific surface activity of the original amorphous powder making it suitable for different applications in non-firing ceramics processing.抄録全体を表示PDF形式でダウンロード (544K)
研究ノート
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Masakuni OZAWA, Hidetomo MATUI, Suguru SUZUKI2015 年 62 巻 10 号 p. 524-526
発行日: 2015/10/15
公開日: 2015/11/19
ジャーナル オープンアクセスTiO2-pillared mica was prepared by mixing mica and acidic solution of hydrolyzed Ti alkoxide, and characterized by XRD and pore distribution measurement. The prepared material was composite powder containing pillared TiO2 fragments after calcination at 700 °C. The doctor blading technique was applied to make green sheets, and the resulting TiO2 pillared mica sheet exhibited good photocatalytic properties for gaseous acetaldehyde degeneration.抄録全体を表示PDF形式でダウンロード (235K)
本会記事
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2015 年 62 巻 10 号 p. Pref10_1-
発行日: 2015/10/15
公開日: 2015/11/19
ジャーナル オープンアクセスPDF形式でダウンロード (182K) -
2015 年 62 巻 10 号 p. Mtg10_2-Mtg10_6
発行日: 2015/10/15
公開日: 2015/11/19
ジャーナル オープンアクセスPDF形式でダウンロード (380K) -
2015 年 62 巻 10 号 p. MtgPr10_1-MtgPr10_17
発行日: 2015/10/15
公開日: 2015/11/19
ジャーナル オープンアクセスPDF形式でダウンロード (818K)
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