“666666！”

"True Alchemist!"

"Copper fetish, understand?"

"Streamer is about to start, can't wait!"

"Damn, are you finally going to build a copper axe?"

"Support, come on!"

The few words of the opening remarks instantly ignited the atmosphere in the live broadcast room!

The barrage suddenly increased.

It hasn't subsided for a long time.

After calming everyone's emotions for a while, Lu Yu continued:

"After a few days of hard work, the relevant preparations are almost ready. ”

"Clay crucibles, copper, furnaces, blowers, you name it......"

"Next, as long as you follow the steps and smelt these copper materials, you are basically done. However, before the official start, there is one more thing that we need to think about, and that is molding. ”

"The purpose of fusing copper is to cast it into the shape we want, not randomly. ”

"Therefore, making molds is also one of the indispensable links. ”

Normally, most of the molds used to cast metal are made of heat-resistant materials.

Such as platinum, quartz, silicon carbide.

But these things are not the first choice for Lu Yu.

Even if you can, there's no tool to turn it into a mold for you.

Therefore, the above materials are no longer in his consideration.

Judging from the current situation, the most reliable is still clay.

Mold with clay is also a casting method that has existed since ancient times.

Convenient and accessible.

The molding rate is also impressive.

The production process is not as complicated as it seems.

It is nothing more than to carve out the type of mold you want with a sharp tool on the flattened mud.

Finally, the molten liquid metal is poured into it and allowed to air dry and fix.

Nothing difficult.

But there is one thing that must be noted, and that is the soil quality of the clay.

It is best to use high-quality dry clay.

Those with large water content are not competent.

But the clay next to the water source is mostly wet.

So, we had to find another way.

"Moulding is the most critical part of determining the quality of the final product. ”

"Basket weaving, the emphasis is on closing. ”

"Don't be careless, otherwise, all the previous efforts will be in vain......"

As he spoke, Lu Yu had already returned to the house, put on the bamboo basket on his back, and left the camp in great strides.

Prepare to try your luck in the woods first.

"Refractory clays are usually found around water sources, but there are exceptions, and in rock or coal measure formations, there are also small amounts. ”

"A lot of people ask me why don't I go to the river to find it?"

"The root cause is that the soil has too much moisture content, which is not easy to pour, and even if there is no sand, it is not a good choice. It's not that it can't be used, but in order to be sure, it's best not to take this risk. ”

"Because there are more secure options for us. ”

After walking into the jungle.

Lu Yu went around and found a vein splitting zone.

Follow the overgrown ravines on the left bank and push your way forward.

While paying attention to my feet, I carefully observed the changes in the soil layer, and did not miss any clues.

In contrast to wet clay from water sources, most of the clay produced by rocky strata is formed by the weathering of silicate minerals on the earth's surface.

The particles are larger.

The composition is also relatively close to the original stone.

This clay is called primary clay or primary clay by geologists.

The fire resistance of primary clay is stronger.

It is also more competent for smelting operations.

After stepping into the Bronze Age.

In addition to fully mastering the method of smelting metals, people have also entered a completely new field for the application of other natural materials.

Clay is one of them.

In order to be able to smelt bronze more efficiently, people gradually abandoned low-quality clays.

At this time, the virgin clay naturally became their favorite object.

Nowadays, in many of the relics of ancient civilizations that have been discovered, you can see more or less the shadow of the original clay.

The reason for this.

In fact, it is the inevitable result of the development and growth of production technology.

……

There is no direct sunlight and continuous heating.

The situation in the jungle has finally improved.

A breeze is blowing.

It's a lot more refreshing.

It sets off the last tranquility before the rainy season completely breaks out.

Carrying a bamboo basket on his back.

Walked forward for a while.

The trend of the fault zone has suddenly changed.

Immediately afterwards, a huge deep earth pit broke into sight for no reason.

Lean over to look.

The deep pit fault is obvious.

It should be caused by earthquakes, flash floods, or changes in the island's crust.

Inside the pit, you can see the root systems of many trees crisscrossing the area.

The exposed soil layer is grayish-white and looks very delicate.

It was the native clay that Lu Yu was looking for.

"Look. ”

Pointing to a layer of soil, Lu Yu raised his voice and said:

"There's what we want. ”

"The native clay contained in the rocky strata is a perfect soil. ”

"With them, our molds are in place, and we have to find a way to get some up. ”

The words fell.

Lu Yu didn't hesitate at all, and immediately jumped over.

From the edge of the pit to the bottom of the pit.

I found a place with a lot of soil and took a look.

As a result, I don't know if I don't look at it.

Shocked at first sight!

Lu Yu was suddenly overjoyed, and he almost laughed out loud.

This kind of soil.

It's not your average native clay.

It's very rare kaolin!

You must know that high-quality kaolin, whether it is fire resistance or adsorption, is second to none!

"Guys, let's see what I've found......"

After grabbing a handful of kaolin, Lu Yu opened his palm.

Put it under the lens.

"Food?"

"Anchor, I don't read much, don't lie to me, isn't this just ordinary dirt?"

"Looking at Yushen's little expression, you won't find food again, will you?"

"Eat dirt?"

", I seem to have seen this kind of soil in Jingdezhen, what's it called?!"

"Yushen don't sell it, let's find out the answer quickly!"

glanced at the barrage, Lu Yu was happy.

Eyes full of joy:

"Brothers, this is no ordinary native clay. ”

"It's kaolin!"

"Kaolin is a very high-quality non-metallic mineral, mostly clay and claystone dominated by kaolinite clay minerals. Because of its white color and delicateness, we Chinese people call it dolomite. ”

"Kaolin is mostly dull, white and delicate when pure, and can have gray, yellow, brown and other colors when containing impurities. The appearance can be loose soil block and dense rock block according to different genesis......"

After a brief introduction, Lu Yu pushed closer to the camera again.

Slapped the details of the clay in the palm of the hand.

Then he continued:

"The kaolin here, look at the color, the purity is really visible. ”

"Pure kaolin, white and delicate, soft soil, with good plasticity and fire resistance and other physical and chemical properties. Its mineral composition is mainly composed of kaolinite, halloysite, mica, illite, montmorillonite, quartz, feldspar and other minerals. ”

"Kaolin is very versatile, mainly used in paper, ceramics and refractories, and it is a perfect choice for casting molds. ”

The density of kaolin is between 2.54-2.60 g/cm3.

The melting point is about 1785 °C, which is very refractory.

At the same time, it is also malleable.

Wet soil can be molded into various shapes without shattering and can remain unchanged for a long time!

"Kaolin is highly respected in China and is named after Gaoling Village, Jingdezhen, Jiangxi. ”

"However, it is not unique to China. ”

"In nature, it is widely distributed and has a large number of surviving amounts, almost 20 billion tons. ”

"Among them, the nearest continent to us has a very productive kaolin deposit, so it is not surprising that kaolin can be found here. ”

Between words.

Lu Yu had already removed the bamboo basket.

Peel off the soil layer in one fell swoop.

Handfuls were filled one after the other.

Because it's just to build a mold, it doesn't take much anyway.

It's almost the same to get a half-basket.

Instead of bringing them all back to camp, you should leave them here and grab them as you go.

It's a lot more convenient.

"Alright, brothers, it should be almost. ”

"This soil is enough for us to create a perfect mold......"

Carrying the bamboo basket, Lu Yu stepped around the pit.

Finally, I found a relatively low place, climbed on it, and returned to the camp the way I came.

……

Arrived at the place.

Lu Yu put the clay aside first.

I turned around and turned out the wooden strip tile mold that I had used to make the tile blank.

"This tile mold can help us a lot, and the size is just right. ”

"Otherwise, you'll have to do it all over again. ”

After speaking.

Lu Yu sat down beside the furnace.

Place the tile mold on the stone slab that is stuck in the mud.

Then, a large handful of kaolin was poured into it until it was completely filled and compacted.

With this clay mold, the next step is to carve out the desired shape on it.

"Because of the limited amount of copper that has been restored, it is basically hopeless to make a large jungle axe, but it is more than enough to have a Viking tomahawk to play with. ”

Holding a stone knife in his hand.

While carefully drawing on the clay model, Lu Yu explained to the audience:

"The Viking tomahawk is the most common and used weapon of the Vikings. ”

"In the era of cold weapons, almost everyone has a hand, which is improved from the commonly used logging axe, the head is crescent-shaped, and the lethality is huge when wielded, and it also has the effect of breaking armor and shields, and it is no longer a problem to cope with daily production and life. ”

"Viking battle axes tend to be not very heavy, they can be thrown, they are melee weapons, and they are much lighter than swords. ”

"And it's easy to handle, far less bulky than people imagine, it's a short and concise type, and the requirements for materials are not so harsh, so it should be our best choice at the moment......"

Soon.

Draw while talking.

It took less than five minutes.

Lu Yu carved the general shape of the tomahawk deeply on the clay mold.

The length of the axe blade is moderate, and the curved blade surface is very exaggerated.

This is also one of the features of the Viking Tomahawk.

Thanks to this design, Vikings were able to easily concentrate their lethality in one point when fighting with a tomahawk in hand.

The protection of helmets and chain mail can be broken very easily!

In fact, in Norse history, it is not uncommon to see descriptions of Viking warriors splitting apart the enemy's armor with a single axe.

"Okay, here, the mold is basically ready. ”

"Now, let's get straight to the point—"

Then.

Lu Yu didn't stop.

He hurriedly fetched the fire and lit the firewood in the furnace.

Hold the bow drill of the blower tightly and keep pushing and pulling it up.

"Huhuhuhu——!"

The flames are sometimes big and sometimes small.

The firewood in the furnace finally burned completely.

Looked at.

Lu Yu first put the clay crucible filled with copper grains into the firewood pile.

Then, another circle of charcoal was poured.

"After the fire is burned, it directly leads to charcoal. ”

"Let the charcoal fire wrap the crucible, in this process, be sure to increase the heat as much as possible while the crucible is evenly heated, don't be stingy with charcoal, and don't be stingy with your own strength-"

Not finished yet.

Lu Yu picked up the drill bow again and pulled it up frantically!

"Come on, Featherage!"

"Hand speed is invincible!"

"Copper Fetish + Kirin Arm =?"

"Crazy Output!"

"There's new material in the ghost animal area!"

"Awesome......"

……

It took about ten minutes to operate.

A charcoal fire inside a furnace.

More and more red.

The terracotta crucible has also undergone subtle changes.

Although it has not yet turned red, judging from the structure of the clay surface, it seems that the temperature inside the furnace has already reached its peak.

Looking at the situation in the furnace, Lu Yu didn't give up, and poured another pile of charcoal into it.

"Maintaining the furnace temperature is the key to smelting metals. ”

"Be sure to add charcoal in time. ”

"Don't bother. ”

"Because once the temperature goes down, all the previous efforts are in vain. ”

Between words.

An hour passed.

At this point, the furnace had already eaten three waves of charcoal.

The bottom of the crucible has also had a very noticeable reaction.

Before I knew it, it turned completely red.

The copper inside seems to be melting little by little......

See here.

Lu Yu finally breathed a sigh of relief.

But the movements of the hands did not stop.

Still holding the bow drill, he kept pushing and pulling.

"When the clay crucible turns completely red, the copper inside will naturally turn into copper water. ”

"But it's going to be a very long process. ”

"Even if everything goes well, it may take an hour. ”

"During this time, you must be optimistic about the furnace temperature, and if necessary, you can add charcoal in time......

The voice landed.

Lu Yu summoned the drone in front of him, pushed the camera closer, and took a picture of the situation inside the fireworks.

The drone of the system is made of special materials.

No fear of heat.

Even extreme violence can't destroy it, let alone this 1,800-degree furnace fire, even if it penetrates into the magma, it's a trivial matter.

The next second.

After the camera zooms in.

The audience clearly saw the change in the copper material in the crucible!

Call it magical!

“666666666666”

"It's really melting!"

"Damn, awesome!"

"Feather's drone, it's too hardcore, isn't it?, it's okay to reach into the fire?!"

"After all, it is exclusive to local tyrants!"

"It feels like drones are a little more awesome!"

“233333333”

……

Soon.

Another hour passed.

During the period, in addition to chatting with the audience without a word, Lu Yu added another stubble of charcoal to the stove.

Now.

The continuous high temperature finally burned the crucible to a red and very dazzling color.

And the copper inside seems to have turned into water.

See this scene.

Lu Yu wiped the sweat from his head and said:

"It's burned to this extent, and it's basically about the same. ”

"Alright, let's find something to clip the cauldron out, and then pour the copper water inside onto the clay mold—"