Controlled-atmosphere & Vacuum Thermal Oxidation
可控气氛与真空热氧化配方
标签：可控气氛, 真空, 热氧化, 均匀, 氧分压, 配方
常规火焰着色不均匀的根源是氧分压不可控。箱式炉可控气氛方案：氧分压调至 10⁻²–10⁻³ atm（氮气掺 1–2% 空气），紫铜在 250–300 °C 保温 15–30 min 得到均匀蓝紫色，整炉一致性好于手工火焰一个档次。低氧分压下膜层生长缓慢可控，适合薄壁件（0.3 mm 紫铜片）双面同时着色；出炉后趁热蜡封可免除指纹风险。
Uneven torch color comes from uncontrolled oxygen partial pressure. In a box furnace, set pO₂ to 10⁻²–10⁻³ atm (nitrogen mixed with 1–2% air) and hold copper at 250–300 °C for 15–30 min for a uniform blue-violet across the whole batch — a clear step up from torch work. Slow film growth at low pO₂ suits thin parts (0.3 mm copper sheet) colored on both faces at once; wax-seal while hot to avoid fingerprints. ---