Open an aircraft carrier to fight against Japan

The girl opened the door of another room and led everyone in. Lin Yuan followed behind. When she went into the room, she found a cylinder as high as one person in the center, and the middle section was made of transparent glass. It is made, and the inside can be seen from the outside. Lin Yuan knows that this is the single crystal pulling equipment.

The girl pointed to the cylinder and said, "This is our single crystal pulling machine. Now I will demonstrate the single crystal pulling process to you."

The girl opened the cabinet and took out a few pure white cubes, saying: "This is the silicon ingot we obtained after refining, but the arrangement of the crystals inside is irregular. We call this kind of silicon ingot." polysilicon."

The girl took out a small piece of crystal from the cabinet and said: "This is monocrystalline silicon, which is the seed crystal in the drawing process. We will use this seed crystal to pull monocrystalline silicon in a while. Don't worry." Seeing that the teacher is picking up this piece of seed crystal with his hands, although the teacher is wearing gloves, it is absolutely impossible to do so in actual industrial production, is there any student willing to answer?"

Lin Yuan happened to know the reason. He wanted to repair the relationship with this girl, so he was the first to raise his hand. The girl gave Lin Yuan a hard look, and then called a boy who raised his hand to answer. The boy said: "Because impurities will be introduced, pure single crystal silicon cannot be produced!"

The girl praised the boy a few words, then put the silicon ingot at the bottom of the cylinder, opened the top of the cylinder, took out a clip, put the seed crystal in the clip, put it back into the cylinder, and put it on the cylinder. A switch was pressed, and the machine made a "humming" sound, and the silicon ingots gradually softened, as if they had melted, and everyone immediately gasped in amazement.

The girl said: "The switch I pressed is used to control the heater. There is an electromagnetic heater at the bottom where the silicon ingot is located. After a while, the heater will heat the silicon ingot to [-] degrees. The silicon ingot will Melted into silicon liquid, and then the teacher controlled the seed crystal close to the silicon liquid, and pulled out the silicon single crystal."

Everyone watched with bated breath. After a while, the silicon ingot melted into a liquid. The girl pressed a switch, and the cylinder began to rotate. The girl explained: "During stretching, the cylinder and the seed crystal It has to be rotated in the opposite direction so that a single crystal of silicon can be pulled."

The girl operated the handle, started to pull the seed crystal down, and slowly approached the silicon liquid, the girl suddenly said: "Look, the seed crystal has touched the silicon liquid, I'm going to lift the seed crystal."

The girl spoke and lifted the seed crystal slowly, a miracle happened, the silicon liquid below stuck to the seed crystal and rose slowly, like a stick rising slowly, Lin Yuan measured the crystal The diameter of the single crystal drawn in the 50s was no more than 25 mm in diameter in our time. Only [-]mm."

The seed crystal was raised higher and higher, and the single crystal rod was getting longer and longer, but Lin Yuan suddenly discovered that there was a shallow crack in the center of the single crystal rod. Lin Yuan had seen the scene of Su Zhengming pulling a single crystal. At that time, Su Zhengming and He said: There must be no cracks on the single crystal rod. Once cracks appear, not only the single crystal cannot be used, but if the single crystal rod breaks, it is very likely to damage the furnace lining below, although it will not break , but it will be very troublesome to smash the cracks.

Because cracks expand very quickly at high temperatures, once cracks appear on the furnace lining, it will be overhauled, and the furnace will be opened for maintenance. Opening the furnace is a troublesome thing.

Thinking of Su Zhengming's words, Lin Yuan quickly said to the girl: "There is a crack on the single crystal rod, stop now."

Who knew that the girl said lightly: "It's okay, such cracks will not cause problems. We are a demonstration experiment, not for production use."

Lin Yuan thought to himself: "Accidents are all caused by such a mentality. The parties involved always have a fluke mentality, thinking that small problems are nothing, and they will regret it when small problems develop into big problems." Lin Yuan emphasized his tone and said: " Can no longer be pulled, must stop!"

The girl got angry when she heard Lin Yuan's accentuated tone, and said, "Which class are you in? How dare you talk to the teacher like that!"

Seeing the monocrystalline rod getting longer and longer, Lin Yuan thought in his heart: "The single crystal rod may break at any time." He hurriedly said sharply, "Stop quickly, do you hear me?"

The girl was a little frightened by Lin Yuan, so she stopped involuntarily, but she quickly regained her teacher's prestige, and said angrily: "You broke into the laboratory first, and you didn't pay attention to the class, and now you dare to speak loudly to the teacher. Yelling and saying, what class are you in, what is your name, watch how I deal with you!"

Lin Yuan thought to himself: "I don't have a class." So she didn't speak, and the girl said angrily, "Don't think I can't know if you don't tell me!" She turned her head and asked the girl at the beginning: "What's his name? Which class? Have you met him?"

The girl said, "We haven't seen him before, so we don't know who he is?"

The girl was a little panicked, thinking: "This person must be a bad guy sneaking in." At this moment, an old man suddenly walked in from the door, Lin Yuan and the girl seemed to see a savior.

It turned out that this old man was Su Zhengming. Su Zhengming saw Lin Yuan for the first time, so he smiled and said, "Xiao Lin, why did you come to do experiments with the students?"

Seeing that Su Zhengming knew Lin Yuan, the girl quickly asked, "Teacher, do you know him?"

Su Zhengming laughed loudly and said, "Of course, he is Lin Yuan!"

The girl and everyone exclaimed in surprise. The girl blushed suddenly when she thought that she had reprimanded the captain as a student. Before she could speak, Su Zhengming looked at the cylinder, then turned to face the students Said: "Okay, class is over, you go back."

As soon as the crowd left, Su Zhengming's face fell fiercely, and he said to the girl: "Lu Xue, what's the matter with you? There is a crack on the single crystal rod, why do you stop now? How much do I tell you? If there is a crack, stop it!"

Lin Yuan thought to himself: "So this beautiful teacher is called Lu Xue." Lu Xue argued, "I want to..."

Su Zhengming didn't listen to her excuses at all, but raised his tone and said sharply to Lu Xue: "You girl, why are you so fiddly? What's going on in your head? Did you forget to bring your head again!"

Lu Xue was scolded by Su Zhengming, and the ruthlessness of reprimanding Lin Yuan just now disappeared. She lowered her head, tears rolled in her eyes, Su Zhengming walked over, put the single crystal rod back down, and turned on the switch Re-melt it into silicon liquid, then turned his head, and wanted to reprimand Lu Xue again. When Lin Yuan saw it, he hurried forward and said to Su Zhengming with a smile: "Mr. Su, please calm down, young people, it is inevitable to make mistakes. For my sake, stop criticizing her."

Su Zhengming then said: "For Lin Yuan's sake, I won't criticize you today, go back and write a [-]-word review, and leave it to me tomorrow!"

Lu Xue nodded reluctantly, and Su Zhengming said, "Xiao Lin, did you come to see me for something?"

Lin Yuan said: "Of course, I'm going to make a semiconductor laser, I hope you can give me some help."