Lead-free In-containing and Ta-containing bismuth bath alloy for troostite heat treatment
A troostite and alloy technology, applied in the field of bismuth bath alloys, can solve the problem of not fundamentally eliminating lead pollution, and achieve the effects of eliminating flux inclusions, low cost, excellent resistance to volatilization and oxidation
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Embodiment 1
[0018] A lead-free In and Ta bismuth bath alloy for heat treatment at 490°C using troostite. In terms of weight percentage, the chemical composition of the alloy is: Ba: 1.2wt.%, In: 0.3wt.%, Ta: 0.8wt.%, Sc: 0.5wt.%, Sm: 0.2wt.%, Co: 1.5wt .%, the balance is bismuth. The preparation method of the alloy: add the above-mentioned raw materials into the atmosphere-protected induction furnace, and use a silicon carbide crucible; induction heating to 700-800 degrees to form an alloy solution, and use the electromagnetic stirring effect to fully stir for about 10 minutes; put the alloy The liquid is kept at 700-800 degrees for 10 minutes and then cast into the equipment at the same level as the hot top for semi-continuous casting into the required round ingot. The ingot moves down at a speed of 6m / min. The material is used for troostite heat treatment of iron and steel materials in a bismuth bath; wherein, the use temperature of the bismuth bath alloy is 480-550 degrees.
[0019] ...
Embodiment 2
[0021] A lead-free In and Ta bismuth bath alloy for heat treatment at 520°C using troostite. By weight percentage. In terms of weight percentage, the chemical composition of the alloy is: Ba: 1.4wt.%, In: 0.2wt.%, Ta: 0.9wt.%, Sc: 0.5wt.%, Sm: 0.2wt.%, Co: 1.6wt .%, the balance is bismuth. The preparation method of the alloy: add the above-mentioned raw materials into the atmosphere-protected induction furnace, and use a silicon carbide crucible; induction heating to 700-800 degrees to form an alloy solution, and use the electromagnetic stirring effect to fully stir for about 10 minutes; put the alloy The liquid is kept at 700-800 degrees for 10 minutes and then cast into the equipment at the same level as the hot top for semi-continuous casting into the required round ingot. The ingot moves down at a speed of 8m / min. The material is used for troostite heat treatment of iron and steel materials in a bismuth bath; wherein, the use temperature of the bismuth bath alloy is 480-...
Embodiment 3
[0024] A lead-free In and Ta bismuth bath alloy for heat treatment at 540°C using troostite. By weight percentage. In terms of weight percentage, the chemical composition of the alloy is: Ba: 1.2wt.%, In: 0.4wt.%, Ta: 1.0wt.%, Sc: 0.5wt.%, Sm: 0.2wt.%, Co: 1.8wt .%, the balance is bismuth. The preparation method of the alloy: add the above-mentioned raw materials into the atmosphere-protected induction furnace, and use a silicon carbide crucible; induction heating to 700-800 degrees to form an alloy solution, and use the electromagnetic stirring effect to fully stir for about 10 minutes; put the alloy The liquid is kept at 700-800 degrees for 10 minutes and then cast into the equipment at the same level as the hot top for semi-continuous casting into the required round ingot. The ingot moves down at a speed of 8m / min. The material is used for troostite heat treatment of iron and steel materials in a bismuth bath; wherein, the use temperature of the bismuth bath alloy is 480-...
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