耐火浇注料的养护与烘烤曲线｜Castable Curing and Baking Schedule

摘要：浇注料炸裂很少发生在服役期，多数发生在第一次升温：养护没做透、烘烤曲线太陡，内部水汽顶裂衬体。讲养护条件、脱模时间、烘烤分段与驻留点怎么定。
Abstract: Castable spalling rarely happens in service; it happens on first heat-up. Poor curing and a steep baking ramp let trapped steam crack the lining. Curing conditions, demoulding time, and how to build a multi-stage baking schedule.

正文： 浇注料衬体出问题，多数人第一反应是料不行或施工不行，其实相当一部分炸裂和剥落出在养护和烘烤两个环节。这两个环节没有任何设备投入，只花时间，但恰恰是最容易被工期压缩掉的。
Main text: When a castable lining fails, the usual suspects are material quality or workmanship. In reality a large share of spalling and explosive spalling traces back to curing and baking — two steps that cost nothing but time, and are therefore the first to be squeezed by the schedule.

一、养护：湿养护不是可选项
1. Curing: wet curing is not optional

浇注料加水拌合后水化反应需要水和时间。环境温度保持在 10 到 25 摄氏度之间最理想，养护 24 到 48 小时再脱模。低水泥浇注料尤其怕早期失水，表面一干水化就停，强度上不来，脱模时边角全掉。
Hydration needs water and time. Ideal ambient temperature is 10 to 25 degrees Celsius, curing 24 to 48 hours before demoulding. Low-cement castables are especially sensitive to early drying: once the surface dries out, hydration stops, strength stalls, and edges crumble on demoulding.

湿养护的做法是覆盖湿麻袋或塑料膜并定期喷水，冬季要防冻，夏季要防晒防风。养护期表面发白就是失水信号，立刻补水。
Wet curing means covering with damp hessian or plastic sheeting and spraying water periodically. Protect from freezing in winter and from sun and wind in summer. A whitening surface is the sign of water loss — rewet immediately.

二、烘烤曲线的分段逻辑
2. The logic of a staged baking ramp

烘烤的目标是让自由水和结合水在气化前有路可走。升温太陡，水在衬体内部直接气化，蒸汽压超过衬体强度就炸。分段驻留点设在 110、200、350、600 摄氏度附近，在 110 摄氏度处驻留最久，这是自由水集中释放的平台。
Baking lets free water and combined water escape before they flash to steam. A ramp that is too steep vaporises water inside the lining, and steam pressure above the lining strength causes explosive spalling. Hold stages near 110, 200, 350 and 600 degrees Celsius, with the longest hold at 110 — the plateau where free water is released.

• 110 摄氏度驻留：按衬厚每 25 毫米 1 小时起算，厚衬体翻倍。
  Hold at 110 C: start from 1 hour per 25 mm of lining thickness, double for thick sections.
• 200 至 350 摄氏度：结合水与结晶水释放区，升温和驻留都要缓。
  200 to 350 C: combined and crystal water release zones — ramp and hold both slow.
• 600 摄氏度以上：陶瓷结合逐步形成，可以正常升温到工作温度。
  Above 600 C: ceramic bonding develops, and normal heat-up to operating temperature is safe.

三、两个常见的误判
3. Two common misjudgements

一是把烘窑曲线抄给别人用。同一牌号、不同衬厚、不同施工季度的曲线都不同，抄曲线省的事，后面用炸裂来还。二是中途停火再点火时直接快升，衬体里残留的水分没有重新走完流程，第二次点火炸得比第一次还厉害。
First, copying someone else’s baking curve. The same castable with different lining thickness or a different season needs a different schedule; the time saved now is repaid as spalling later. Second, restarting quickly after an interruption: residual moisture in the lining never finished its process, and the second heat-up spalls worse than the first.

一句话总结：养护决定衬体的强度上限，烘烤决定这个强度能不能保得住。工期再紧，这两段时间不能省。
In one line: curing sets the ceiling of lining strength, and baking decides whether that strength survives. No matter how tight the schedule, these two windows cannot be cut.