| Project/Area Number |
06650136
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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 |
機械工作・生産工学
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| Research Institution | SHINSHU UNIVERSITY |
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Principal Investigator |
SHIMIZU Yasuo SHINSHU UNIVERSITY,FACULTY OF ENGINEERING,PROFESSOR, 工学部, 教授 (20142284)
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| Project Period (FY) |
1994 – 1995
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| Project Status |
Completed (Fiscal Year 1995)
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| Budget Amount *help |
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1995: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1994: ¥1,400,000 (Direct Cost: ¥1,400,000)
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| Keywords | Surface Finishing / Internal Surface Coating / Fixing of the Coating / Combined Process of Thermal Spraving and Casting / High Velocity Oxgen-Fuel Flame Spraying / Core Component / Wear-Resisting Coating / WC-12%Co Coating / 耐摩耗皮膜 / 鋳造 / 皮膜固定化 / 耐摩耗処理 / サ-メット皮膜 |
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| Research Abstract |
The aim of this research is to overcome the difficulty of internal surface spraying. Experimental investigational were carried out to develop a new technique in order to fix the hard wear-resisting coating on the internal surface of small holes such as cylinder wall in the cast products.
Thermal spraying technology and casting technology were skillfully combined. The core components, previously coated hard wear-resisting coating by applying thermal spraying process, were builts in a casting mold. The desired coating such as WC-12%Co coating is left on internal surface of the hole on the cast product after removing just the core component from it. WC-12%Co coating produced by the process of high velocity oxygen-fuel flame(HVOF)spraying has a hardness above Hv900, therefore, it provides an effective wear-resisting property for protecting the surface of aluminum alloy cast products. Although HVOF spraying could not deposit the WC-12%Co coating directly on the surface of resin coated sand core, adoption of the supplemental aluminum underlay coating made it possible. Adhesive strengh of the WC-12%Co coating to the AC4B aluminum alloy cast products is 5-10 MPa in shear mode. It was improved to 10-20 MPa by applying overlay coating of Ni-10%Al alloy, preheating of the casting mold and by roughening the Ni-10%Al alloy overlay coating surface. Three kinds of overlay coating materials Ni-10%Al, Cu-10%Al and Zn were experimented. It was revealed that the overlay coating of Ni-10%Al alloy was most effective to strengthen the adherence between WC-12%Co coating and the cast AC4B body.
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