Preparation process of an al-si-mg-b-mn casting alloy with excellent flow properties
An al-si-mg-b-mn, flow performance technology, applied in the field of aluminum alloy materials, can solve the problem that the fluidity requirements of aluminum alloy thin-wall casting cannot be met, the refinement limit refinement effect is unstable, and the improvement effect is not good. Obvious and other problems, to achieve the effect of reducing loose pores, enhancing feeding ability, and reducing the possibility of cracks
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Embodiment 1
[0039] This embodiment prepares hypoeutectic Al-Si-Mg-B-Mn casting alloy according to the following steps:
[0040] 1. Calculation of ingredients: according to the mass percentage of 91.43% Al, 6.5% Si, 0.45% Mg, 0.02% B, 1.50% Mn and 0.10% Ti, weigh pure aluminum, Al-Si master alloy, Al-Mg master alloy, Al-B master alloy, Al-Mn master alloy and Al-Ti master alloy complete the batching;
[0041] 2. Coating and drying: In order to prevent the aluminum alloy melt from reacting with the tool during the casting process, the coating (mainly composed of ZnO and NaSiO 3 , the composition ratio is 3:1) evenly coated on the graphite clay crucible, melting tools and molds, and put the graphite clay crucible in the melting furnace to dry. Drying and preheating in a drying oven at -300°C;
[0042] 3. Smelting and casting: Add the weighed Al-Si master alloy and pure aluminum into the graphite crucible which has been preheated to 300°C in sequence, and then raise the temperature to 730°C ...
Embodiment 2
[0048] The ingredients of this embodiment are shown in Table 1.
[0049] The preparation method of this embodiment is the same as that of Example 1.
Embodiment 3
[0051] The ingredients of this embodiment are shown in Table 1.
[0052] The preparation method of this embodiment is the same as that of Example 1.
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