Dewaxing & Burnout: Schedule & Curves
脱蜡（蒸蜡/焙烧）工艺与温度曲线
标签：脱蜡, 焙烧, 温度曲线, 蒸汽脱蜡
脱蜡有两种主流方式：蒸汽脱蜡（0.3–0.6 MPa 蒸汽，约 15–30 分钟，蜡回收率高）与高温焙烧（箱式炉升温至 650–850℃，蜡汽化并烧尽残留）。焙烧同时去除型壳水分与有机结合剂，并让壳达到浇注温度（热壳浇注可减少冷隔）。推荐曲线：室温→150℃（排湿，1 h）→300℃（蜡软化流出）→650℃（保温 1–2 h 完全烧净）→随炉冷却或保温待浇。严禁升温过快，否则型壳炸裂。
Dewaxing has two routes: steam autoclave (0.3–0.6 MPa, ~15–30 min, high wax recovery) and high-temp burnout (box furnace to 650–850℃, vaporizing and burning out wax). Burnout also removes shell moisture and organic binder and brings the shell to pour temperature (hot-shell pouring reduces cold shuts). Recommended curve: RT → 150℃ (dry, 1 h) → 300℃ (wax softens/out) → 650℃ (hold 1–2 h) → cool or hold for pour. Never ramp too fast or the shell shatters. ---