刚出窑的建水紫陶壶,壶口有一层白色物质是什么东西?

接触建水紫陶的朋友经常会发现,在紫陶壶口、紫陶罐口会残留有一些白色的物质,在大件的紫陶缸盖子口那儿尤其常见。这种白色的物质是什么呢?对健康有害吗?

Friends who come into contact with Jianshui purple pottery often find that there are some white substances left in the mouth of purple pottery pot and purple pottery pot, especially in the large purple pottery jar cover. What is this white substance? Is it harmful to your health?

这种白色的物质名叫氧化铝,是一种氧化物。它的特点是耐高温,熔点可达到2054℃,常作为耐火材料使用。

This white substance, called alumina, is an oxide. It is characterized by high temperature resistance and its melting point can reach 2054 ℃.

在烧制建水紫陶时,使用氧化铝,主要作用是防止盖子口因高温而粘连在一起打不开、防止紫陶作品的底部和棚板粘在一起拿不下来。

In the process of firing Jianshui purple pottery, alumina is used to prevent the lid from sticking together due to high temperature, and to prevent the bottom of the purple pottery and the shed board from sticking together.

在烧制紫陶时,为了实现相同比例的收缩,在后期整口时更易于操作,壶盖和壶身、罐盖和罐身会扣在一起入窑同时烧制。在超过1100℃的高温下,盖子和坯身就容易粘连在一起导致打不开。这时候就需要提前在盖子口刷一层耐火防粘剂,这就是氧化铝。

When firing purple pottery, in order to achieve the same proportion of shrinkage, it is easier to operate in the later stage of the whole mouth. The lid and body of the pot, the lid and the body will be buckled together and fired at the same time. In the high temperature of more than 1100 ℃, the cover and the body are easy to stick together, resulting in failure to open. At this time, it is necessary to brush a layer of refractory and anti adhesion agent in front of the cover, which is alumina.

同样,在放置陶坯的一层一层棚板表面,也需要撒上一层氧化铝防粘剂,防止陶坯在高温烧制过程中粘在棚板上取不下来。

In the same way, a layer of alumina anti sticking agent should be sprayed on the surface of one layer of shed board to prevent the ceramic body from sticking to the shed plate during high temperature firing.

紫陶的特殊点在于烧制出来后还需要整口和打磨,在经历这两道工序后,大部分的氧化铝都会被磨掉了,但是仍然会有一些残留在盖子口处,那么这些残留的氧化铝对健康有害吗?

The special point of purple pottery is that it still needs to be trimmed and polished after being fired. After these two processes, most of the alumina will be ground off, but some will still remain at the cover opening. Is this residual alumina harmful to health?

氧化铝是一种普遍存在的物质,金属铝在接触氧气后就会自然反应生成。我们生活中常用铝锅烧菜、铝壶烧水,时间一长,表面就会自然氧化生成一层氧化铝薄膜,它的作用是保护铝锅铝壶避免被进一步氧化。

Alumina is a kind of ubiquitous substance. Aluminum will react naturally after contacting with oxygen. In our daily life, we often cook vegetables in aluminum pots and water in aluminum pots. As time goes on, the surface will naturally oxidize to form a layer of alumina film. Its function is to protect the aluminum pot from further oxidation.

我们的日常餐饮中普遍接触氧化铝,实际的研究结果也显示,氧化铝对于人体健康的影响微乎其微,而且其流通也不受国家任何限制。所以,如果发现紫陶缸盖子口有白色的氧化铝,不必担心,大可放心使用。

Our daily meals are generally exposed to alumina. The actual research results also show that alumina has little impact on human health, and its circulation is not subject to any national restrictions. Therefore, if you find white alumina on the lid of the purple pottery jar, you don’t have to worry about it. You can use it at ease.

未经允许不得转载:饮茶乎 » 刚出窑的建水紫陶壶,壶口有一层白色物质是什么东西?

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