Preparation method of hypereutectic aluminum-silicon alloy casting
An aluminum-silicon alloy and hypereutectic technology, which is applied in the metallurgical field, can solve the problems of reducing the mechanical properties of the hypereutectic aluminum-silicon alloy, limiting the use range of the hypereutectic aluminum-silicon alloy, and deteriorating the machining performance, and is easy to realize. Industrialization, small thermal expansion coefficient, small thermal cracking tendency
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Embodiment 1
[0016] Preheat the crucible to 400±5°C, put Al28Si alloy, Al50Cu alloy and Al8Ni alloy in the crucible, raise the temperature to 720±5°C, press the metal magnesium into the molten material with a bell jar after all the materials are melted, and the metal The alloy melt is obtained after the magnesium is melted;
[0017] Use a bell jar to press the modifier Cu10P alloy into the alloy melt and stir evenly, and then keep it at 820±5°C for 10 minutes. The amount of modifier added is 0.07% of the total weight of the alloy melt based on the P in the Cu10P alloy;
[0018] ZnCl in a bell jar 2 Press into the alloy melt, the addition amount is 0.20% of the total weight of the alloy melt, degassing at 820±5°C for 5 minutes, then remove the slag, and then cast at 770°C to make a hypereutectic aluminum-silicon alloy billet. The composition by weight percentage is Si20%, Cu2.0%, Ni1.1%, Mg1.6%, impurity 0.6%, and the balance is Al;
[0019] Heat the hypereutectic aluminum-silicon alloy b...
Embodiment 2
[0022] Preheat the crucible to 400±5°C, put Al28Si alloy, Al50Cu alloy and Al8Ni alloy in the crucible, raise the temperature to 720±5°C, press the metal magnesium into the molten material with a bell jar after all the materials are melted, and the metal The alloy melt is obtained after the magnesium is melted;
[0023] Use a bell jar to press the modifier Cu10P alloy into the alloy melt and stir evenly, and then keep it at 820±5°C for 12 minutes. The amount of modifier added is 0.071% of the total weight of the alloy melt based on the P in the Cu10P alloy;
[0024] ZnCl in a bell jar 2 Pressed into the alloy melt, the addition amount is 0.18% of the total weight of the alloy melt, degassing at 820±5°C for 6 minutes, then removing the slag, and then pouring at 780°C to make a hypereutectic aluminum-silicon alloy billet. The composition by weight percentage is Si22%, Cu1.0%, Ni1.6%, Mg1.0%, impurity 0.5%, and the balance is Al;
[0025] Heat the hypereutectic aluminum-silicon...
Embodiment 3
[0028] Preheat the crucible to 400±5°C, put Al28Si alloy, Al50Cu alloy and Al8Ni alloy in the crucible, raise the temperature to 720±5°C, press the metal magnesium into the molten material with a bell jar after all the materials are melted, and the metal The alloy melt is obtained after the magnesium is melted;
[0029] Use a bell jar to press the modifier Cu10P alloy into the alloy melt and stir evenly, then keep it warm at 820±5°C for 14 minutes, and the amount of modifier added is 0.074% of the total weight of the alloy melt based on the P in the Cu10P alloy;
[0030] ZnCl in a bell jar 2 Press into the alloy melt, the addition amount is 0.16% of the total weight of the alloy melt, degassing at 820±5°C for 7 minutes, then remove the slag, and then cast at 790°C to make a hypereutectic aluminum-silicon alloy billet. The composition by weight percentage is Si21%, Cu1.5%, Ni1.4%, Mg1.2%, impurity 0.5%, and the balance is Al;
[0031] Heat the hypereutectic aluminum-silicon a...
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