The girl opened the door of another room and walked in with everyone, Lin Yuan also followed, and when she got to the house, she found that the center of the room was a cylinder that was one person high, and the middle section was made of transparent glass.

The girl pointed to the cylinder and said, "This is our monocrystalline drawing machine, I will show you the process of monocrystalline drawing now." ”

The girl opened the cabinet and took out a few pure white squares from it, and said, "This is the silicon ingot we get after refining, but the arrangement of the crystals in it is irregular, and we call this silicon polysilicon." ”

The girl said and took out a small piece of crystal from the cabinet, and said: "This is monocrystalline silicon, that is, the seed crystal in the drawing process, we will use this seed crystal for a while, pull out the monocrystalline silicon, don't look at the teacher now picked up this piece of seed crystal with his hand, although the teacher wears gloves, but in the actual industrial production, this is absolutely not possible, which student is willing to answer?" ”

Lin Yuan happened to know the reason, he wanted to mend the relationship with this girl, so he was the first to raise his hand, the girl gave Lin Yuan a fierce look, and then called a boy who raised his hand to answer, and the boy said: "Because impurities will be introduced, there is no way to make pure monocrystalline silicon!" ”

The girl praised the boy a few words, then put the silicon ingot at the bottom of the cylinder, opened the top end of the cylinder, took out a clip, put the seed crystal in the clip, put it back in the cylinder, and then pressed a switch on the cylinder, only to hear the machine make a "buzzing" sound, and the silicon ingots slowly softened, as if melted, and everyone suddenly let out an exclamation sound.

The girl said: "The switch I pressed is used to control the heater, and there is an electromagnetic heater where the silicon ingot is located at the bottom, and the heater will heat the silicon ingot to 2,000 degrees in a while, and the silicon ingot will melt into silicon liquid, and then the teacher will control the seed crystal to approach the silicon liquid and pull the silicon single crystal out." ”

Everyone watched with bated breath, and after a while the silicon ingot melted into liquid, and the girl pressed a switch, and the cylinder began to spin, and the girl explained: "When stretching, the cylinder and the seed crystal must rotate in opposite directions, so that the silicon single crystal can be drawn." ”

The girl operated the handle and began to pull the seed crystal down, slowly approaching the silicon liquid, and the girl suddenly said: "Look, the seed crystal is in contact with the silicon liquid, and I am going to lift the seed crystal." ”

The girl said and slowly lifted the seed crystal, and a miracle appeared, the silica liquid below actually stuck to the seed crystal, and slowly rose, like a slowly rising stick, Lin Yuan estimated the diameter of the crystal, and couldn't help but exclaim in his heart: "Good guy!" The diameter of the single crystal used for demonstration experiments alone is 100 millimeters, and in our time, the diameter of the single crystal drawn in the 50s of the 20th century is only 25 millimeters. ”

The seed crystal is getting higher and higher, and the single crystal rod is getting longer and longer, but Lin Yuan suddenly found that there is a shallow crack in the center of the single crystal rod, Lin Yuan has seen Su Zhengming pull the scene of the single crystal, at that time Su Zhengming said to him: There must be no cracks on the single crystal rod, once there is a crack, not only the single crystal can not be used, in case the single crystal rod is broken, it is very likely to smash the furnace lining below, although it will not be smashed through, but it will be very troublesome to smash the crack.

Because cracks expand quickly at high temperatures, once a crack appears in the furnace lining, it is necessary to overhaul it, and it is a troublesome thing to open the furnace when it is repaired.

Lin Yuan thought of Su Zhengming's words, and hurriedly said to the girl: "There is a crack on the monocrystalline rod, stop it quickly." ”

Who knew that the girl said lightly: "It's okay, there will be no problem with such cracks, we are demonstrating experiments, not production and use." ”

Lin Yuan thought to himself: "Accidents are all due to such a mentality, the parties always have a fluke mentality, feel that there is nothing wrong with small problems, and regret it when small problems develop into big problems." Lin Yuan accentuated his tone and said, "You can't pull it anymore, you have to stop!" ”

The girl also became angry when she heard Lin Yuan's accentuated tone, and said, "Which class are you from?" How dare you talk to a teacher like that! ”

Lin Yuan watched the monocrystalline rod get longer and longer, and thought to himself: "The monocrystalline rod may break at any time. Hurriedly said, "Hurry up and stop, do you hear me!" ”

The girl was a little frightened by Lin Yuan, and involuntarily stopped, but she quickly regained the teacher's prestige, and said angrily: "You first trespassed into the laboratory, and then you didn't listen to the class carefully, and now you dare to yell at the teacher, saying, which class are you from, what is your name, look at how I clean you up!" ”

Lin Yuan thought to himself: "How can I have a class." So she didn't speak, and the girl said angrily, "Don't think that if you don't say it, I can't know the way!" She turned to the girl at first and asked, "What's his name?" Which class is it from? Have you seen him? ”

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

The girl panicked a little and thought, "This person can't be a bad guy." At this moment, an old man suddenly walked in outside the door, and 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, "Xiaolin, why did you come to do experiments with the students?" ”

When the girl saw that Su Zhengming knew Lin Yuan, she hurriedly asked, "Teacher, do you know him?" ”

Su Zhengming smiled and said, "Of course, he is Lin Yuan!" ”

The girl and everyone were all exclaimed, the girl thought that she actually reprimanded the captain as a student, her face turned red all of a sudden, and before she could speak, Su Zhengming looked at the cylinder, and then turned her head and said to her classmates: "Okay, class is over, you can go back." ”

As soon as everyone 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 in the monocrystalline rod, why is it stopping now? How many times have I told you, if there is a crack, it will stop! ”

Lin Yuan thought to himself: "It turns out that this beautiful teacher is called Lu Xue. Lu Xue argued: "I want to ......"

Su Zhengming didn't listen to her defense at all, but raised his tone and said to Lu Xue sharply: "You are a girl, why are you still careless, what are you thinking in your head?" Did you forget to bring your head again! ”

Lu Xue was reprimanded by Su Zhengming, the ruthlessness of reprimanding Lin Yuan just now was gone, she lowered her head, tears swirled in her eyes, Su Zhengming walked over, put the single crystal rod back below, turned on the switch to remelt it into silicon liquid, and then turned her head and wanted to reprimand Lu Xue again, Lin Yuan saw it, hurriedly stepped forward, and smiled at Su Zhengming: "Old Su, please stop being angry, young man, it is inevitable to make mistakes, you look at my face, don't criticize her again." ”

Su Zhengming said: "For Lin Yuan's sake, I won't criticize you today, go back and write a 3,000-word review, and hand it over to me tomorrow!" ”

Lu Xue nodded reluctantly, and Su Zhengming said, "Xiaolin, do you have something to do with me?" ”

Lin Yuan said: "Of course, I want to make semiconductor lasers, I hope you can give me some help." ”