The Red Era, the Opening University Speech

Chapter 19 Crucible-less Suspended Ball Melting
"Ding~" a prompt sound rang in my mind.

Li Mu saw the message and replied: "Thank you, Ask!"

After chatting with Ask for a while, Li Mu turned his attention to the information.

There are more than 10G of files, several times more than last time.

"Is it really possible for a human to learn all this?" Li Mu stared blankly at the long list of information. The various file names made him dizzy.

There are so many things, let alone understanding them, it takes a lot of time to just take a quick look at them.

"School is about to end, let's watch it later!" Li Mu glanced at the clock in the classroom and saw that there were only two minutes left before school was over.

At this moment, Li Mu vaguely felt that someone was staring at him intentionally or unintentionally. He turned his head and looked around, but found nothing.

"Dingling bell~"

The bell rang for the end of get out of class.

Li Mu stood up quickly, but before he could run, he heard Wang Ya calling him from the left:

"Li Mu!"

The sound was so loud that everyone in the classroom looked over.

When they saw that the most beautiful girl in their Beijing Institute of Technology was called Li Mu, everyone was surprised.

Soon, someone realized that it would not be surprising for a relationship between a talented man and a beautiful woman.

Many boys looked at the two of them with envy and jealousy.

"grass!"

"We have to buy time and watch it once first!"

Li Mu cursed inwardly, not showing any of the happiness that others saw.

With so many people watching, he has no way to escape!
Wang Ya walked over quickly, crossed her arms, and said, "Li Mu, let's go."

This time, she won't let Li Mu run away again.

"Don't be anxious, my stomach hurts, I need to go to the toilet first!" Li Mu covered his stomach and pretended to be in unbearable pain.

Wang Ya looked at Li Mu suspiciously and said helplessly:

"Go ahead. Zhang Jian and I will be waiting for you outside."

Li Mu ignored Wang Ya's words and quickly walked out of the classroom.

Just as he was about to run.

Wang Ya actually followed!

Wang Ya didn't stop until she reached the toilet door.

But Li Mu glanced back secretly and saw that the girl was actually waiting for him outside the door!

"The ghost is still haunting us!" Li Mu hated secretly.

Even the shit escape doesn't work, so I really have no choice but to fight on!

Li Mu opened the information given by Ask and browsed through it quickly.

At first I was very happy, thinking that I could finally solve this problem.

But the more I read on, the more I felt something was wrong!
"What Wang Ya just said seems to be prepared in a laboratory."

"But why did Ask publish data on industrial-scale preparation?"

"Did I make a mistake?"

Li Mu quickly looked up the news and found that it did not mention whether it was prepared in a laboratory or industrially.

"No, no, no, it was Wang Ya. She didn't mention it at all when she talked to me!"

"Fuck! How did I know there are two types of single crystal silicon preparation?"

Li Mu was so annoyed that he quickly sent a message to remedy the situation: "Ask, I'm wrong. What I want is the laboratory preparation data!"

The message was sent, but Ask did not respond.

5 minutes later...

Ask still did not respond.

Li Mu couldn't wait any longer.

"No matter what, they are all single crystal silicon, they should be about the same, let's just memorize them first!"

Li Mu gritted his teeth and began to read quickly with his mind.

Seven or eight minutes later, a boy walked into the toilet: "Li Mu, Wang Ya asked me to come in and see if you forgot to bring toilet paper?"

The boy took a few pieces of toilet paper and handed them to Li Mu. "No, I have some. You guys wait a moment."

Li Mu was annoyed. It would be fine if he just blocked the door, but he even had to urge him.

"It's okay. I just happen to have a stomachache too." The boy said, then squatted down in the pit next to Li Mu with a smile.

Not only did he squat down and say nothing, but he also chatted with Li Mu while pulling the string.

"I'm leaving now." Li Mu couldn't bear it any longer, so he picked up his pants and left.

When I came out, Wang Ya and two girls were waiting outside.

"You're out. Where's Zhang Jian?" Wang Ya asked with a smile when she saw Li Mu coming out.

Li Mu said: "He's not finished yet."

"Then let's go first. He will go directly to the experimental teaching building in a while." Wang Ya said immediately.

"Okay." Li Mu nodded helplessly.

Come to the experimental teaching building.

Enter the classroom.

Perhaps because there are girls in the team, the classroom is very clean. There are several workbenches that have been put together and covered with white cloth, with bottles and jars of materials placed on them in an orderly manner.

Wang Ya took out a notebook from the table and handed it to Li Mu: "This is our previous experimental data. We use the direct-pull method to produce single-crystal silicon with a target purity of 99.9999%, but in actual operation..."

Li Mu broke out in a cold sweat as he listened to this. This was completely different from industrial preparation.

Apart from anything else, it is impossible for a laboratory to build an industrially prepared single crystal furnace to melt silicon liquid.

"Aske!" Li Mu sent another message to Aske.

Still no response.

"What should I do?" Li Mu was panicked.

At this time, Wang Ya had finished introducing the content and made a summary:

"The current problem is that the single crystal silicon produced by Czochralski is seriously contaminated by the crucible, and the actual improvement effect is not high and difficult to control."

The crucible is a container for molten silicon. During the melting process, the single crystal silicon will be contaminated to varying degrees.

However, in order to improve the purity of single crystal silicon, Wang Ya and her colleagues had to adopt this method, because better experimental conditions were to use the crucible-free suspended zone melting method.

After Wang Ya finished speaking, the two girls in the classroom, along with the boy who came later, looked at Li Mu with anticipation.

Li Mu's brain quickly made a choice:

“Something has to give.”

"They must have considered that method. I don't know of any other methods."

"I know about single crystal furnaces, but this doesn't make sense. Wait, it seems to make sense!"

……

Just when the four of them were getting a little anxious waiting, Li Mu finally spoke:

"In terms of improving purity, have you ever considered replacing the crucible?"

The principle of the single crystal furnace is to create a vacuum environment to reduce the possibility of silicon being contaminated during the melting process.

"Are you talking about the crucible-less suspended ball melting method? But we don't have the experimental conditions!" Wang Ya was a little surprised. Doesn't Li Mu know this?
The domestic semiconductor industry as a whole is relatively backward. Although the conditions for realization are not really absent, at least these students do not have them for the time being.

Li Mu said: "Yes and no."

"My idea is to make a furnace that is kept under vacuum or filled with an inert gas, which would reduce contamination of the silicon during the melting process."

After Li Mu finished speaking, he looked at the four people in the classroom nervously.

I don't know if this kind of thing, which is prepared industrially, can be prepared in the laboratory.

"That makes sense!" A round-faced girl suddenly slammed the table.

"What's the reason?" Wang Ya asked.

"I don't know, but Li Mu was able to win first place in the individual competition, so what he said must be not groundless." The round-faced girl said embarrassedly.

"Okay, stop joking." Wang Ya glanced at the round-faced girl unhappily and continued to ask, "Is the method you mentioned possible?"

"Yes, there is. The difficulty of this method is to control the temperature of the furnace. Otherwise, even the slightest change may affect the quality of the final single crystal silicon."

After Li Mu finished speaking, he saw that the four people were a little confused, so he said:

"How about this, give me three days and I'll give you a plan to solve the first step of 'single crystal silicon preparation'."

(End of this chapter)