鋳造工学
Online ISSN : 2185-5374
Print ISSN : 1342-0429
ISSN-L : 1342-0429
68 巻, 5 号
選択された号の論文の8件中1~8を表示しています
研究論文
  • 堺 邦益, 日野 春樹, 苧野 兵衛
    1996 年 68 巻 5 号 p. 387-391
    発行日: 1996/05/25
    公開日: 2011/02/01
    ジャーナル フリー
      Coating with Ni based self-fluxing alloy powder and ceramics balls for iron casting was developed. The fusing and solidification progress of the Ni alloy powder was investigated by the permeability test and also, analyzed by the finite element method. The results showed that the fused Ni alloy hardly permeated into ceramics filter even though a 7kPa head of molten metals was applied, and that the chemical composion of the Ni alloy at the outer layer remained the same. A reason for this may be that a solidificatio shell of cast iron forms in an early stage near the interface of Ni alloy and cast iron, while Ni alloy continues to fuse moving to the surface, and in this case the lquid phase of the Ni alloy changes during isothermal solidification.
  • 堺 邦益, 日野 春樹, 苧野 兵衛
    1996 年 68 巻 5 号 p. 392-397
    発行日: 1996/05/25
    公開日: 2011/02/01
    ジャーナル フリー
      Composite coating with ceramics balls and metal matrix for iron casting were developed in this study. Three alloys for matrix, cast iron, high Cr cast iron and Ni based self-fluxing alloy, also for ceramics balls, alumina and zirconia are tested. The erosion resistance was investigated by sand blast method. The results showed that wear weight loss of these composites coating were remarkably reduced by ceramics balls, but, it depended on metal matrix also. In its early stage, metal matrix was ground preferentially, later projecting ceramics balls resisted wear, unless the balls did not fall off. Especially partial stabilized zirconia balls have the effect of increasing the erosion resistance.
  • 徐 玉橋, 前田 安郭, 野村 宏之
    1996 年 68 巻 5 号 p. 398-404
    発行日: 1996/05/25
    公開日: 2011/02/01
    ジャーナル フリー
      The computer simulation of inclusion motion and final trapped position in casting was carried out in this study. The sand casting of aluminium is taken as an example of numerical analysis, and the simulation is carried out for various foundry conditions. In the simulation, inclusion movement after cavity filling, residual flow and trap stituation of inclusion during solidification are analyzed. The location of inclusion particles trapped in the solidified phase changes widely with inclusion density, size, particle inflow time and inflow position. In particular, the density difference between inclusion and molten metal has significant effects on the particle trapped place in cast metal. Based on the information on detailed motion, place of inclusion entrapment and its mechanisms in varions casting conditions as given in this study, the optimum casting conditions can be designed in order to reduce inclusion defects.
  • 森 克巳, 孫海平 1
    1996 年 68 巻 5 号 p. 405-410
    発行日: 1996/05/25
    公開日: 2011/02/01
    ジャーナル フリー
      A model for the reactions that occur between the liquid metal in the slag layer and in the well of a cupola furnace was developed based on the thermodynamic and kinetic theories. According to the model, the composition of the cast iron in the well of the cupola was investigated by varying operating conditions of the cupola and several key parameters related to in the reaction rates.
  • 張 茂勲, 陳 暁, 錢 匡武, 洪 性吉, 手塚 裕康, 里 達雄, 神尾 彰彦
    1996 年 68 巻 5 号 p. 411-416
    発行日: 1996/05/25
    公開日: 2011/02/01
    ジャーナル フリー
      Al-10%Si-1.5%Cu-0.5%Mn-0.5%Mg alloy composites reinforced with Al2O3-SiO2 fiber were fabricated by the squeezing casting technique. The characteristics of these materials were investigated by the microstructure observation with TEM, hardness test, wearing test and compression test. The matrix alloy showed significant age-hardening at 488 and 623K up to the peak hardness, and subsequently the hardness markedly decreased with aging time. On the other hand, the composite material with 20vol% fiber showed almost no significant age-hardening, and its hardness only decreased slightly as the aging time increased. Compared to the matrix alloy, the composite material with 20vol% fiber exhibited excellent wearing resistance at temperatures such as R. T. , 473 and 673K. At 673K, adhesive wear occurred in the matrix alloy. The compression test results at high temperatures indicated that the composite material with 20vol% fiber had two times higher proof stress than the matrix alloy. Additionally, the composite material with 20vol% fiber had more improved mechanical properties than that with 5vol% fiber.
  • 池永 明, 後藤 佳行, 新田 康寛, 川本 信, 小林 紘二郎, 上西 啓介
    1996 年 68 巻 5 号 p. 417-422
    発行日: 1996/05/25
    公開日: 2011/02/01
    ジャーナル フリー
      The coating layers of Ni-Al Intermetallic compounds were prepared on spheroidal graphite cast iron substrates by the applying of self-propagating high-temperature synthesis (SHS) reaction, and simultaneously bonded on substrates by the excessive heat of reaction. The results obtained were as follows. (1) The synthesizing reactions begin at about 873K before the melting point of Al. (2) The reaction layer consists of Ni3Al, NiAl, Ni2Al3 and Ni phases, and it sufficiently bonded on base metal. (3) With the powder compact of Ni-60 at % Al, Ni solid solution almost disappeared in the reaction layer, and then the hardest phase, Ni2Al3 of Ni-Al intermetallic compounds was produced.
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