P/M Fecralloy의 성형성 및 전기저항특성 향상에 관한 연구
A Study on the Development of Compactability and Electrical Resistivity for P/M Fecralloy
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The Fe-Cr-Al alloy system shows an excellent heat resistance because of the formation of an Al2O3 film on the metal surface in an oxidizing atmosphere at high temperatures up to 1400oC. The Fecralloy needs an additive that can act as a binder because of its bad compactability. In this study, the green compacts of STS434L and Al powder added to Fecralloy are oxidized at 950oC for up to 210 h. Fecralloy and Al is mixed by two types of ball milling. One is vented to air and the other was performed in a sealed jar. In the case of Al addition, there are no significant changes in the electrical resistance. Before the oxidation test, Al oxides are present in the Fecralloy surface, as determined from the energy dispersive spectroscopy results. The addition of Al improves the compactability because of an increased density, and the addition of STS434L increases the electrical resistivity by forming a composite oxide.
Abstract
The Fe-Cr-Al alloy system shows an excellent heat resistance because of the formation of an Al2O3 film on the metal surface in an oxidizing atmosphere at high temperatures up to 1400oC. The Fecralloy needs an additive that can act as a binder because of its bad compactability. In this study, the green compacts of STS434L and Al powder added to Fecralloy are oxidized at 950oC for up to 210 h. Fecralloy and Al is mixed by two types of ball milling. One is vented to air and the other was performed in a sealed jar. In the case of Al addition, there are no significant changes in the electrical resistance. Before the oxidation test, Al oxides are present in the Fecralloy surface, as determined from the energy dispersive spectroscopy results. The addition of Al improves the compactability because of an increased density, and the addition of STS434L increases the electrical resistivity by forming a composite oxide.
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