| Project/Area Number |
02805086
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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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 | Kumamoto University |
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Principal Investigator |
CHIBA Akira Kumamoto University, Dept. of Engineering, Professor, 工学部, 教授 (90005322)
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| Co-Investigator(Kenkyū-buntansha) |
NISHIDA Minoru Kumamoto University, Dept. of Engineering, Associate Professor, 工学部, 助教授 (90183540)
FUJITA Masahiro Kumamoto University, Dept. of Engineering, Professor, 工学部, 教授 (20040389)
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| Project Period (FY) |
1990 – 1991
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| Project Status |
Completed (Fiscal Year 1991)
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| Budget Amount *help |
¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1991: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1990: ¥1,100,000 (Direct Cost: ¥1,100,000)
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| Keywords | Explosive coating / Shock energy / Underwater-shock wave / TiAl intermetallic compound / Self-smelting spray powder / Hard materials / Detonation / 円筒衝撃法 / 熱サイクル試験 / 自溶性溶射粉末 / TiAl |
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| Research Abstract |
Coating of the hard materials on the various metals has been made by using shock energy in the present study, which is the first attempt in the world. The process was named the shock coating or the explosive coating. The principle of the explosive coating is as follows. The coating powder was accelerated and collided with base metal by detonation of explosive. The obtained coating layer was highly densified and it also had substantial bonding strength with metal substrate by mechanical anchoring effect. The axisymmetric and the newly developed explosive coating techniques were applied in the present study. Underwater-shock wave was utilized in the latter technique. The coating materials used were TiAl intermetallic compound, self-smelting spray powders. Metal and ceramics composite powders treatedly high energy ball mill were also used. Metal substratum used were pure copper and austenitic stainless steel.
The following conclusions were led.
(1) In the case of axisymmetric explosive coating technique using explosive with detonation velocity of 26OOm/s, the coating layer of highly densified TiAl and self-smelting spray powders without cracks was completed on austenitic stainless steel rod.
(2) Detonation velocity of the explosive used in the explosive coating using underwater-shock wave was 69OOm/s. Highly densified coating layer of TiAl and TiAl/Ti composite powders was produced on copper plate without crack. Vickers hardness of the layer was 400 to 60ODPN in the both cases.
(3) Thermal shock test of the coating layers described above was carried out by thermal cycling. All the layers were still sound after 100 thermal cycles. Heat treatments after shock coating were effective for developments of the thermal shock properties.
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