Chapter 351 Confused Yu Yuncheng
The teacher at Beijing University of Technology looked at Gao Zhendong leaving the podium, but he was thoughtful in his heart.
This teacher Gao seems to enjoy class very much.
What a coincidence, isn’t it? As for students, we have a lot of them, the quality is good, and we have them for a long time.
This teacher has no doubt about Gao Zhendong’s ability to be qualified as a teacher. He is no ordinary teacher. For this important task, the person supported by Beijing University of Technology is a Dean of the College.
He had no idea whether a person was qualified to be a teacher, which was why he could tell at a glance that Gao Zhendong really enjoyed class.
Well, it seems we can make some arrangements. Don’t you like class? I’ll let you go! Hum!
We had lunch at the National Defense Working Committee. While eating, we also answered many questions from comrades.
The leaders of the National Defense Working Committee also came over. We are all front-line comrades here. No matter what, we have to come and have a meal with everyone.
The leader probably heard the chief engineer talk about the class, and quietly said to Gao Zhendong: "We can't talk about the gangster 60 now."
Only then did he realize what was going on. It seemed that there were only a few people in the meeting that day. The reason was not just because it was a mid-term report.
Gao Zhendong seemed to have figured something out, and his mood became obviously higher. Hehe, I didn't expect it to be useful.
It seems that laziness can’t steal. No, it’s still possible. Among the comrades who came to study today, there are people from the Changjian Factory. Go back and say hello to Mr. Luo. Just give this comrade a hard time.
After dinner, Gao Zhendong hurried back to the third rolling mill, but the dean of Beijing University of Technology went to ask the leader to stay a moment.
"Leader, I think that given Comrade Gao Zhendong's situation, I would like to ask him to come to our school to give a course. It is not the kind of short-term training, but a long-term professional course."
Others wouldn't dare to say this kind of thing, and it would be useless if he did, but since he was the dean of the college, there was no problem.
The leader chuckled: "What are you going to let him teach you?"
"That's it, as a professional course for the third or fourth year."
The leader shook his head: "That's it?"
The dean was confused, leader, what do you mean?
The leader thought for a while and then revealed: "Let's put it this way, he can take many professional courses such as computers, digital circuits, C language, fire control, materials, management, electronics, etc., but it is impossible for him to take all of them. It’s possible.”
Is there such a talent? That makes me want it even more. Even if I don’t go to class, it’s still good to keep it as a signboard or to solve problems.
“He has learned all these?”
“He was the one who made DJS-59 and 60D, and he also wrote the C language. Several new materials you are using now were also created by him. The first silicon single crystal was made by him. Many of the new things your students are learning now came from him. Oh, by the way, the book on the tank weapon stabilization system provided to you by the Prairie Tractor Factory. He also wrote it.”
Ah this
The dean resisted the urge to curse. Civilized people don't do that. But he wanted to introduce this person even more. He could just bring him in and use him as a mascot.
Although the leader's words are very unbelievable, such a young person, even if he has three heads and six arms, can't do more than that, right? But it was obvious that the leader would not have the leisure to make such a big joke with him.
"Let him choose. He can get into anything he wants. If he doesn't want to get into it, just put his name on it. We'll talk about it when he wants to get in. Give him a professor position, leader. This is sincerity." He looks like a very bachelor. This kind of person can shine wherever he is invited. He just goes to class and so on. Looking at this comrade's work, he knows everything with his butt, and he doesn't have much time.
As for why you gave it to the professor, ahem, what did I hear just now? Just one or two are enough.
The leader really listened to his proposal. This matter is good for Gao Zhendong. Due to various reasons, it is more difficult to raise the height for the time being. Then we might as well expand it horizontally. It's a kind of recognition.
And to some extent, this increases the resources available to Gao Zhendong.
For Beijing University of Technology, there are also many benefits. Gao Zhendong has a lot of things within their scope.
Thinking of this, the leader said: "Professor, no need, it's too eye-catching, he won't care about this, lecturer, give this first, and then slowly make up for it later."
See you. The leader was relieved, and the dean was overjoyed: "Leader, then I will go back to the school to go through the procedures."
As a dean, if he goes to the school to go through the procedures, he will definitely have it at his fingertips, let alone A leader of the National Defense Working Committee spoke to confirm.
And I believe that the school knows about Gao Zhendong's situation and is eager to finalize this matter as soon as possible. Among other things, Professor Liu and Professor Luo are still asking for help to break the enemy's defense.
The "person" who is "looking for a job" is in a hurry.
Looking for a "job seeker", as long as the person is good, then the company is in a hurry.
Chinese is so interesting.
"Well, you guys can go and do it, but please note one thing. Keep the secrets that should be kept secret, and keep the details confidential. You go to the chief engineer of the committee and he will arrange for you to know. Also, pay attention to safety. , if he wants to engage in any dangerous project with you, he can only use his words, not his hands."
It's impossible for Gao Zhendong not to set off fireworks. Look at the propellants he took out, and look at the Black Mix 60. We still don't know what significant things will come later. We can't stop eating because of choking. But it can still be done by asking him to be a gentleman but not using his hands.
——
Yu Yuncheng came to the capital again. He had prepared a sufficient amount of polycrystals of mercury-cadmium telluride compound according to Gao Zhendong's method.
I came here this time to ask Gao Zhendong for the next method and process.
Unexpectedly, Director Gao became Chief Engineer Gao when the moon was gone.
"Is the synthesis of polycrystalline going smoothly? How are the finished product inspection results?"
Yu Yuncheng is confident: "It's going very smoothly. According to the method you gave me, if nothing happens, I can get the result that suits you. The polycrystalline ingot with a dendritic structure was described. We also tested the ingot and found that the proportions of components were consistent with expectations, and the macroscopic components were uniform.”
Hear this, Gao Zhendong felt relieved, it would be no problem, this step was considered a success.
Huh? wrong! What does "no surprise" mean?
"From what you say, there are some accidents?"
Yu Yuncheng nodded: "In some cases, the quartz tube will explode. We have also made a preliminary analysis. According to the mercury vapor pressure and related information you gave us, According to calculations, the mercury partial pressure during the synthesis process is as high as nearly 40 atmospheres. This may be the main reason. Considering factors such as heating, we cannot increase the thickness of the quartz tube without limit, so the tube sometimes bursts."
Gao Zhendong knows that within the test temperature range, the vapor pressure of pure mercury can be as high as 130 atmospheres. Even if the compound is not pure mercury, the partial pressure of mercury in the molten state is 30 to 40 atmospheres. This is very important for quartz tubes. brought huge challenges.
In this case, the quartz tube becomes a pressure vessel. In addition to withstanding high temperatures, it also has to withstand a certain amount of pressure from the inside to the outside.
The most troublesome thing is that for the manufacture of mercury cadmium telluride crystals, the quartz tubes are disposable, which means that this tube can withstand the mercury vapor pressure this time, but this does not matter. Because the pipe cannot be reused, I still don’t know if the next pipe can withstand the pressure.
It seems that there is still no way to save it, so we have to use a more troublesome method.
Gao Zhendong said to Yu Yuncheng: "In this way, you can add a cover outside."
"Add a cover?"
Gao Zhendong nodded: "Put the heater on , quartz reaction tube, and temperature-measuring K-type thermocouple are placed in a water-cooled stainless steel cylinder, and a pressure of 40 atmospheres is added to the stainless steel cylinder to balance the mercury vapor pressure in the tube, so that it will not explode. "< br>
Yu Yuncheng was stunned for a moment: "Is it that simple?"
Gao Zhendong smiled: "As long as the engineering problem can be solved, it doesn't matter whether it is simple or not."
This method is also an improvement on the original method, pressurized crystallization.
Yu Yuncheng thought for a while, and this method seems to work. I can’t make the tube thicker, but the condom can, no matter how thick it is.
This is actually the same as astronauts who cannot withstand the vacuum due to internal pressure, so they wear a space suit on the outside to balance the pressure inward.
Yu Yuncheng smiled and said: "Mr. Gao, you are still so simple and direct in solving the problem. So what should we do next?"
Gao Zhendong said: "The next work must be completed in this pressurized furnace."
The method used by Gao Zhendong to prepare mercury cadmium telluride crystals is called the solid-state recrystallization method, or the quenching-annealing method. .
In the previous step, the quartz synthesis reaction tube was sprayed with nitrogen and quickly quenched to allow the compounds inside to form a polycrystalline ingot with a dendritic structure. This was prepared for this step.
At this time, the "quenching" step in the quenching-annealing method has actually been completed.
This method is somewhat counter-intuitive. Generally speaking, in order to recrystallize polycrystalline and form a single crystal, the polycrystalline must be melted or dissolved and then crystallized.
However, the reason why this method is called solid state recrystallization method is that this thing is solid during the recrystallization process, and polycrystalline is infusible!
The process of turning a polycrystal into a single crystal is completed during the annealing process.
Hearing this, Yu Yuncheng was dumbfounded by Gao Zhendong's words, "There is this thing?" What is the principle of this? who I am? Where am I?
"Mr. Gao, if you don't even melt it, how do you turn a polycrystal into a single crystal? Is it hard to squeeze?"
If there is such a good thing, what kind of orders are there ahead? Crystal furnace?
Press! Press me hard!
The problem is, even if there is a mercury vapor partial pressure of 40 atmospheres, it is no problem to burst the quartz tube under this pressure, but if you want to press polycrystalline into single crystal? Even if you increase the pressure ten times, see if you can handle the crystal structure.
Gao Zhendong also knows that this sounds quite magical to the current Yu Yuncheng, but the fact is that this method was developed by John Bull and Citigroup, and John Bull has improved it and is trustworthy.
The full name is the pressurized solid state recrystallization method. The pressurization step mentioned above was improved by John Bull.
(End of this chapter)