Ignition prevention of magnesium by simultaneous addition of calcium and zirconium

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Abstract
The influence of simultaneous addition of calcium and zirconium on the ignition of magnesium was investigated. The ignition behaviour and ignition prevention of magnesium by calcium and zirconium were also clarified. As soon as pure magnesium melts in the air, it ignites. However, magnesium alloy containing 0.5 mass% Ca ignites continuously at a temperature around 40 K higher than the ignition temperature of pure magnesium. The continuous ignition temperature of Mg-0.5 mass% Ca alloy rises to 1020 K by the addition of 1.6 mass %Zr. The prevention of ignition is obtained by the simultaneous addition of 1.3 mass% calcium and 1.4 mass% zirconium, even at a temperature higher than 1083 K. The oxide on the surface of Mg-Ca and Mg-Ca-Zr alloys was detected as calcium oxide by AES and X-ray diffraction analyses. The content of hydrogen in molten magnesium decreases with the addition of calcium and zirconium. The rise of the ignition temperature in magnesium is due to the prevention of reaction of magnesium with oxygen by the calcium oxide film and the decrease of hydrogen in solution by the addition of calcium and zirconium.

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