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CaO 첨가가 AM30 마그네슘 합금의 고온산화에 미치는 영향Effect of CaO Addition on the High-Temperature Oxidation of AM30 Magnesium Alloys
- Other Titles
- Effect of CaO Addition on the High-Temperature Oxidation of AM30 Magnesium Alloys
- Issue Date
- 2014
- Publisher
- 대한금속·재료학회
- Keywords
- magnesium alloys; AM30; CaO; oxidation
- Citation
- 대한금속·재료학회지, v.52, no.3, pp.187 - 194
- Indexed
- SCIE
SCOPUS
KCI
- Journal Title
- 대한금속·재료학회지
- Volume
- 52
- Number
- 3
- Start Page
- 187
- End Page
- 194
- ISSN
- 1738-8228
- Abstract
- AM30 + (0, 0.5, 1, 1.5) wt%CaO magnesium alloys were cast and oxidized at 625 ℃ and 650 ℃ inatmospheric air. The CaO particles that were added during casting allowed casting the AM30 alloys in airwithout using environmentally hazardous SF6 or SO2 gases. They decomposed to dissolve in the α-Mgmatrix and also to precipitate along the matrix grain boundaries as Al2Ca during casting. The ignitiontemperatures were 584.6 ℃ for AM30, 604.5 ℃ for AM30 + 0.5 wt%CaO, and 691.7 ℃ for AM30 + 1 wt%CaO. No ignition occurred for AM30 + 1.5 wt%CaO up to 700 ℃. During oxidation, CaO-rich oxide scales formedon the alloy surface, which prevented direct contact of the alloy with air and fast oxidation of the alloy in air.
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