Argon-Shielded Melting for Low Oxygen
氩气保护熔炼降氧增韧
标签：氩气保护, 除氧, 增韧, 含氧量
纯铜件含氧量超 0.03% 时热脆性显著，吹氩精炼可降至 0.005% 以下：石墨坩埚预热至 1150 ℃，铜液 1180–1200 ℃ 时将氩气管（多孔陶瓷喷头，流量 5–8 L/min）插入底部吹洗 8–12 min，再插 Mg 覆盖剂静置。精炼后伸长率可提升 20–35%，适合对冷弯、旋压后续工序要求高的铸坯。注意氩气吹洗会降温 15–25 ℃，浇注前需回温。
Pure copper becomes hot-short above 0.03% oxygen; argon rinsing brings it below 0.005%: preheat a graphite crucible to 1150 °C, at 1180–1200 °C lance argon through a porous ceramic head (5–8 L/min) for 8–12 min, then cover with Mg flux and hold. Elongation improves 20–35%, ideal for cast billets destined for bending or spinning. Expect a 15–25 °C temperature drop during rinsing and reheat before pouring. ---