铝青铜qal9-4 铸造铝青铜 铝青铜棒材
Solidification characteristics: casting aluminum bronze crystallization temperature range is small, around 30 ℃, belongs to the layered coagulation; Liquidity is good, big volume shrinkage, easy to focus on shrinkage cavity formation, it is not easy to produce dendrite segregation, can obtain tissue density of castings. Oxidation tendency: aluminium alloy contained more, easily oxidized slag forming Al203 suspended; Casting process is also easy to form secondary oxidation slag, it is difficult to remove from the copper liquid. Therefore, whether it is in the process of smelting, or when determining casting process, should take appropriate measures to prevent the oxide into the casting. Inhale tendency: aluminum bronze the vapor pressure of liquid is lower than brass and tin bronze, inspiratory tend to be large. But when a layer of liquid copper surface Al203 mulch, can play a protective effect, so should not be too much in the agitation in the smelting copper liquid. Name of material: aluminum bronze QAl9-4 standard (GB/T 13808-13808) characteristics and scope of application: for aluminum bronze, iron has high strength and anti-friction, good resistance
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