Method for preparing foamed magnesium alloy through secondary foaming
A foaming magnesium alloy and foaming technology, which is applied in the field of secondary foaming to prepare foamed magnesium alloys, can solve the problems of restricting the application of foamed magnesium and not being suitable for the preparation of special-shaped parts, and is conducive to large-scale production and has an obvious flame retardant effect , Improve the effect of compressive strength
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Embodiment 1
[0017] A method for preparing foamed magnesium alloy by secondary foaming, comprising the following steps:
[0018] 1) Heat the magnesium until it melts, and adjust the temperature to 700°C, add a tackifier accounting for 0.5% of the mass fraction of the magnesium solution, and stir at 600rpm for 5 minutes. The tackifier is composed of 45wt% calcium oxide and 55wt% magnesium carbonate. The adhesive is prepared by grinding calcium oxide and magnesium carbonate;
[0019] 2) Cool the melt obtained in step 1) to 580°C, add calcium carbonate powder accounting for 2% of the mass fraction of the magnesium solution, rotate at 800 rpm, stop stirring for 3 minutes, cool to 300°C and keep for 20 minutes;
[0020] 3) The temperature is raised to 800° C. to cause secondary thermal decomposition of calcium carbonate in the billet to produce secondary foaming. After stirring evenly, water-cool to room temperature to obtain a foamed magnesium alloy.
Embodiment 2
[0022] A method for preparing foamed magnesium alloy by secondary foaming, comprising the following steps:
[0023] 1) Heat the magnesium until it melts, and adjust the temperature to 720°C, add a tackifier accounting for 1.5% of the mass fraction of the magnesium solution, and stir at a speed of 700rpm for 10min. The tackifier is composed of 60wt% calcium oxide and 40wt% magnesium carbonate. The adhesive is prepared by grinding calcium oxide and magnesium carbonate;
[0024] 2) Cool the melt obtained in step 1) to 590°C, add calcium carbonate powder accounting for 4% of the mass fraction of the magnesium solution, rotate at 1000rpm, stop stirring for 4 minutes, and cool to 360°C for 24 minutes;
[0025] 3) The temperature is raised to 820° C. to cause secondary thermal decomposition of calcium carbonate in the billet to produce secondary foaming. After stirring evenly, water-cool to room temperature to obtain a foamed magnesium alloy.
Embodiment 3
[0027] A method for preparing foamed magnesium alloy by secondary foaming, comprising the following steps:
[0028] 1) Heat the magnesium until it melts, and adjust the temperature to 740°C, add a tackifier accounting for 2.2% of the mass fraction of the magnesium solution, and stir at 750rpm for 12min. The tackifier is composed of 50wt% calcium oxide and 50wt% magnesium carbonate. The adhesive is prepared by grinding calcium oxide and magnesium carbonate;
[0029] 2) Cool the melt obtained in step 1) to 600°C, add calcium carbonate powder accounting for 8% of the mass fraction of the magnesium solution, rotate at 1200rpm, stop stirring for 6 minutes, cool to 480°C and keep for 28 minutes;
[0030] 3) Raise the temperature to 860° C. to cause secondary thermal decomposition of calcium carbonate in the billet to produce secondary foaming. After stirring evenly, water-cool to room temperature to obtain a foamed magnesium alloy.
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