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| Abstract No.: |
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Scheduled at:
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Thursday, May 12, 2016, Room 3C + 3D 2:00 PM
Amorphous Coatings
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| Title: |
Preparation of thermal spray coatings of Ni-based amorphous alloy with a high-corrosion resistance and ductility
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| Authors: |
Kenji Amiya* / Kansai Center, Institute of Material Research, Tohoku University, Japan
Toshiharu Morimoto/ Nakayama Amorphouws, Ltd., Japan
Ryurou Kurahashi/ Nakayama Amorphouws, Ltd., Japan
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| Abstract: |
Many corrosion-resistant amorphous alloys containing chromium have been prepared mainly in forms of ribbons and thin films, because to demonstrate the characteristics of the amorphous alloys. Recently, the amorphous coating films with high corrosion resistance had been formed by a thermal spraying of the high velocity oxygen fuel method and conventional oxyacetylene gas flame method. Thermal spray gun of oxyacetylene type is a simple and lightweight spraying gun and has popularized widely. More recently, the Fe-based spray films is marketed by optimizations of spray parameters. However, the spray film with higher ductility and corrosion resistance is needed.
Therefore, we considered production of the sprayed coating of Ni-based amorphous alloy. The Ni-Mo-B ternary alloys are developed for flame spray coating. The Ni-Mo-B amorphous alloy exhibited high corrosion resistance (corrosion rate : 10-2 mm/year) in aggressive HCl solutions. And the ductile Ni66Mo15B19 films were successfully coated the transporting iron-rolls by a thermal spraying with gas flame. Furthermore, the ductility and glass forming ability of Ni-Cr-P-B and Ni-Cr-Nb-P-B amorphous alloy were examined, and the Ni-based amorphous alloys that combine both high ductility and high glass forming ability are applied to the thermal spray film.
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