| Project/Area Number |
62470058
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
金属材料(含表面処理・腐食防食)
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| Research Institution | The University of Tokyo |
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Principal Investigator |
TSUJIKAWA Shigeo Faculty of Engineering, 工学部, 教授 (20011166)
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| Co-Investigator(Kenkyū-buntansha) |
SHINOHARA Tadashi Faculty of Engineering, 工学部, 講師 (70187376)
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| Project Period (FY) |
1987 – 1988
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| Project Status |
Completed (Fiscal Year 1988)
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| Budget Amount *help |
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 1988: ¥200,000 (Direct Cost: ¥200,000)
Fiscal Year 1987: ¥2,100,000 (Direct Cost: ¥2,100,000)
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| Keywords | Ceramcs / Alumina / SiC / Machinability of Ceramics / Combined Machining / Electro-Discharge Machining / Sic / 放電加工 / 電解放電複合研削加工法 / O炭化珪素 / 加工 / 研削 / 電解放電研削複合加工 |
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| Research Abstract |
An experimental investigation of the etching of the surface of ceramic materials was carried out by means of electro-discharge machining method in electrolyte solutions. Specimens of alumina or SiC ceramics were immersed in 0.01 - 1 mol/l NaOH, HCl, H_3PO_4, NaH_2PO_4, Na_2HPO_4 and Na_3PO_4 solutions. 0.8 mm tungsten wire was used as a tool electrode and it was pressed to the specimen.
The maximum penetration depth and shape of crater depend on (1) kinds of electrolyte and its concentration, (2) applied voltage between tool electrode and counter electrode and (3) polarity of it. Craters in case of negative tool electrode were deeper than those in case of positive tool electrode. Two types of craters were observed. The deepest portion corresponded to the center of crater (TYpe I) in case of the deep crater and corresponded to the edge of crater (TYpe II) in case of the shallow crater. It was observed that (1) minor composition of alumina ceramic, which existed at the grain boundary of alumina grain, was attacked at the early stage and then alumina grain broke away, and that (2) alumina in Na_2HPO_4 or Na_3PO_4 solutions gave the good results. It was also observed that (1) SiC in 0.01 or 0.1 mol/l NaOH soultion gave the good results and that (2) SiC grain itself was attacked in these solutions.
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