Hand rubbing nuclear fusion live in the wilderness

Chapter 97

Sit straddling the bench, control the rotation of the disc under your feet, and play with the muddy emotions with your free hands.

Since it has been said before that it is a show operation, for today's pottery making, Han Yuan will naturally polish the pottery embryos to the best condition.

The two feet control the rotation speed of the disc, which is faster or slower, and the clay piled on it gradually deforms.

Before, when there were no embryo-drawing tools, he could fabricate relatively round pottery with his bare hands, not to mention that there are embryo-drawing tools now.

As the pottery embryo rotates, a standard pottery embryo is formed soon. The wall of the embryo is thin, with a thickness of only two to three millimeters, which is comparable to the porcelain embryo produced by modern industrialization.

After the rough embryo is ready, Han Yuan takes another chipped piece of wood and hangs the embryo wall evenly. In this process, the embryo wall of the pottery embryo is also polished to make it thinner, making the finished product look more beautiful.

After the pottery embryo is polished, the surface is already very smooth. Take the fine twine, and carefully divide the pottery embryo from the disc bit by bit along the bottom.

After waiting for a while to dry, quickly transfer down the pottery embryo, put it aside to dry in the shade, and wait for subsequent firing.

With the assistance of the foot-operated embryo drawing machine, pottery embryos with extremely thin embryonic walls were born one after another.

Although only half a basket of white clay was excavated this time, a total of six ceramic embryos were produced.

In the end, there was still a lot of white clay left, which was specially left by Han Yuan.

In addition to using this to make glaze liquid, he also needs to make furnace crucibles one by one.

The melting point of ceramics is above [-] degrees, which is enough to dissolve most metals in it.

After the pottery embryo is made, the next step is to grind the enamel.

Quartz, feldspar, and white clay in concrete floors are the raw materials.

Wash all the materials first to remove the dirt and impurities on them.

The washed quartz stone and feldspar are smashed into small pieces on the bluestone, and then the pure materials without impurities are selected from the pieces.

Wash it again, then smash it into a fine powder with a hammer, and finally put it into an iron pot to grind it into a finer powder.

The process is cumbersome, but it is necessary.

While grinding the glaze powder in the iron pot, Han Yuan explained some precautions.

"Enamel is a colorless or colored glassy thin layer covering the surface of ceramic products. This layer of material is ground into powder by various minerals and then fired at high temperature."

"There are many types. The one I am grinding now is called feldspar glaze. The main material is feldspar, and the auxiliary materials are quartz stone and some clay."

"But regardless of the kind of glaze, we must pay attention to the fact that the glaze liquid must be fine and the concentration is appropriate, so that it can be hung on the pottery stably."

"In addition, the impurities in the glaze material must be picked clean."

"If there are impurities in the glaze, the fired ceramics will be ugly, and it will also reduce the probability of successful firing, because the impurities will collapse the glaze during firing."

"Finally, when firing, if it is fired with charcoal fire, then the glazed ceramics must be separated from the charcoal fire."

"Ceramics are not like pottery. They can be thrown directly into a bonfire and burned. If they are not separated, the fired ceramics will be covered with all kinds of dust, which is ugly."

"I'll show you the kiln I made specially for firing porcelain later, and you'll know what the kiln is like."

While speaking, the glaze stone in the iron pot was almost ground.

Glaze liquid should be ground in a special research body, but unfortunately he doesn't have it now, so he can only use an iron pot for cooking instead.

After being beaten with a hammer, there are still many fine particles in the ground glaze, not all of which have turned into powder.

But it's pretty good to be able to grind to this point.

After grinding, add some water to it, stir it, wait for the fine particles to sink to the bottom, and then fish them out.

Then add some white clay into it, stir and melt the clay with your hands until the glaze in the pot becomes thick, and it will drip down like a waterfall hanging on your hand.

The glaze liquid that is grinded out is beige with some beige in color, which is not very good-looking.

But this is just an appearance, because the glaze liquid is very thick in the pot. After the pottery is successfully fired, the glaze liquid will turn off-white, and the color of the finished product is absolutely the same.

Three or four hours had passed since the glaze liquid had been ground, and the pottery embryos that had been hanging aside in the shade seemed to have almost dried up.

Korean Won tried it out, because it was in the shade, although these pottery embryos were almost dry.

But it is still a while before it can be glazed when it is really dry and not deformed.

Simply wait a little longer, and you can have lunch while waiting.

After lunch, Han Yuan checked the pottery again, this time it was really dry enough to be glazed.

There are many ways of glazing, such as dipping glaze method, pouring glaze method, brushing glaze method, spraying glaze method and so on.

Various methods have various uses and methods, and what he wants to use is the glaze dipping method.

This method is the most commonly used method in ceramic glazing methods.

The glaze can be evenly applied on the surface of the green body, even for complex shapes, and it has the advantages of time saving and easy operation.

But when using this method, in order to make the whole body immersed in the glaze slurry, a large amount of glaze slurry is needed, so it is not suitable for large body.

However, the pottery embryos he made today are not large in size, they are all bowls and small basins.

So using this method is simple and labor-saving, and most importantly, it can be glazed!

The glaze dipping method only needs to immerse the whole pottery embryo in the glaze liquid for two to three seconds to hang the glazed surface.

Han Yuan uses iron tongs to clamp the side wall of the dried pottery embryo, and the whole pottery can be taken out after rippling in the glaze liquid in the iron pot.

The pottery that was taken out was immediately covered with a layer of off-white glaze, and it was ready after the excess glaze on the pottery embryo dripped down.

Because today's firing of porcelain has some performance characteristics, Han Yuan specially made some clay support nails out of clay.

In three groups, three support nails are placed on the ground, and then the bottom of the glazed pottery embryo is placed on the support nails to hold it firmly.

Nail firing is the only firing method that can make ceramics close to full glaze after firing, which is perfect for showing off skills.

After all the pottery embryos were glazed and set up, Han Yuan immediately poured out the remaining glaze liquid in the iron pot, and then cleaned the iron pot.

Otherwise, if the glaze liquid is left in the ironware for a long time, it will adhere to the iron pot, which is difficult to clean, and it will corrode the ironware.

After waiting for a period of time, the glaze liquid is almost dry, and then it can be fired in the kiln.

Before that, Han Yuan deliberately let the audience look at the structure inside the kiln.

(End of this chapter)