Journal of the Korean Crystal Growth and Crystal Technology (한국결정성장학회지)

The Korea Association of Crystal Growth (한국결정성장학회)
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The effect of Ca additions on the ignition and combustion behaviors of Mg alloys

Mg 합금의 발화 및 연소특성에 미치는 Ca 첨가의 영향

  • Chung, D.S. (Department of Applied Advanced Materials, College of Korea Polytechnic VI) ;
  • Cho, H. (Department of Nanomechatronics Engineering, Pusan National University) ;
  • Kim, J.K. (Department of Nanomechatronics Engineering, Pusan National University)
  • 정동석 (한국폴리텍 VI대학 신소재응용과) ;
  • 조현 (부산대학교 나노메카트로닉스공학과) ;
  • 김진곤 (부산대학교 나노메카트로닉스공학과)
  • Published : 2009.12.31
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Abstract

In the present study, the effect of Ca additions on the ignition and combustion behaviors of Mg alloys has been investigated. Cracks and inclusions were observed at the free surface and interior in as-cast pure magnesium but not in Ca-bearing Mg alloys. There was a tendency that ignition temperature rapidly increased with increasing Ca content in Mg-Ca alloy. Saturated composition for increasing of ignition temperature was related with solid solubility of Ca in Ca-bearing Mg alloys. The protective oxide layers, MgO, could also be found on the combustion surface of Ca-bearing magnesium alloy.

Mg 합금에서 Ca 첨가가 발화 및 연소 특성에 미치는 영향을 조사하였다. 주조 상태에서 순 Mg은 표면과 내부에 균열과 게재물들이 관찰되었지만 Ca이 첨가된 Mg-Ca 합금에서는 관찰되지 않았다. Mg 합금에 Ca가 첨가됨에 따라 1.5 wt%Ca까지는 발화 온도가 급격히 증가하다가 포화되는 경향을 보였다. 이러한 경향은 Mg-Ca 합금에서 Ca의 고용도와 관련이 있었다. Mg-Ca 합금의 연소 표면에 형성된 MgO 산화층이 발화와 연소를 억제하는 역할을 하였다.

Keywords

References

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