为什么紫陶坯体烧制前需要干燥?

陶坯在烧制前进行晾干或烘干的干燥处理,主要是出于三个方面的考虑:

There are three main reasons for the drying of ceramic body before firing

一、提前晾干可以减少烧制时的破损率

1、 Drying in advance can reduce the damage rate during firing

陶的烧制是一个专业又科学的过程,其中特别关键的环节是通过逐渐升高温度将陶坯中的水分烘烤去除。除水分,会改变陶坯的内部结构,需要考虑到陶坯的承受能力。

Ceramic firing is a professional and scientific process, in which the key link is to gradually increase the temperature to remove the moisture in the ceramic body. In addition to moisture, the internal structure of ceramic body will be changed, so the bearing capacity of ceramic body should be considered.

湿坯水分含量大,如果不经过干燥,直接入窑烧制,大量的水分在短时间内快速消除,陶坯急剧收缩,内部结构快速改变,很容易对陶坯本身造成破坏,导致作品烧坏。

The moisture content of the green body is large. If it is not dried and directly fired into the kiln, a large amount of moisture will be quickly eliminated in a short time, the ceramic body will shrink rapidly, and the internal structure will change rapidly, which will easily damage the ceramic body itself and cause the work to burn out.

烧成后与烧制前体积对比

Volume comparison after firing and before firing

即使是干燥过的陶坯,在入窑烧制时,还需要经过漫长的烘烤阶段。在烘烤、升温、猛火烧造这三个阶段,烘烤耗时最长,超过整个过程六成以上。

Even if it is a dry ceramic body, it still needs a long baking stage when it is fired in the kiln. In the three stages of baking, heating and burning, the baking time is the longest, which is more than 60% of the whole process.

以传统龙窑来说,烘烤需要15~20个小时,升温则只需要5~8个小时。电窑和气窑的时间相对短一点,但是其中烘烤的阶段,耗时也是最长的。可见,陶坯烧制前进行干燥,去除大部分水分,对于烧制的成功与否特别重要。

For traditional Longyao, it takes 15-20 hours to bake and 5-8 hours to heat up. The time of electric kiln and gas kiln is relatively short, but the baking stage is also the longest. It can be seen that drying before firing is very important for the success of firing.

二、剔除一部分不合格的陶坯

2、 Remove some unqualified ceramic body

如果一件陶坯在烧制之前的制作流程中做得不合格,在干燥过程中就会发现端倪,最常见的是开裂。

If a piece of pottery is not qualified in the production process before firing, clues will be found in the drying process, the most common is cracking.

将这些不合格的陶坯事先剔除,既能做到不浪费燃料,又能为其他好的陶坯腾出摆放空间。现代电窑和气窑的空间都十分有限,因此每一个位置都很珍贵。

If these unqualified ceramic blocks are removed in advance, it can not only waste fuel, but also make room for other good ceramic blocks. The space of modern electric kiln and gas kiln is very limited, so each location is very precious.

三、充分利用有限的窑内空间

3、 Make full use of the limited space in the kiln

水分较多的湿坯状态下,陶坯是不能相互重叠起来的,但是经过干燥后,一些价格较低的陶坯就可以相互重叠在一起入窑烧制,这样就可以最大程度的利用有限的窑内空间。

In the wet state with more moisture, the ceramic blocks can not be overlapped with each other, but after drying, some low-cost ceramic slabs can be overlapped together and fired in the kiln, so that the limited space in the kiln can be utilized to the maximum extent.

一般是一些低价的茶杯或者汽锅会相互重叠起来烧制,就算会因此烧坏一些,也可以在烧制的数量上去平衡一下成本。实际上,一个窑口烧制成熟、稳定后,再加上经验丰富的烧窑师傅,因重叠而发生的损坏会很少。

Generally, some low-cost tea cups or steam pots will overlap with each other. Even if they will be burnt out, the cost can be balanced by the quantity of tea cups or steam pots. In fact, after a kiln mouth is mature and stable, combined with experienced kiln master, there will be little damage due to overlapping.

但那些精工装饰制作的陶坯,作者不会冒险将它们重叠在一起,而是牺牲一些烧制数量,去换取更好的烧制成功率。

However, the author will not risk overlapping them, but sacrifice some firing quantity in exchange for a better firing success rate.

未经允许不得转载:饮茶乎 » 为什么紫陶坯体烧制前需要干燥?

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