Chapter 175: Hold an Umbrella for the Navy and Army (3k)

Gao Zhendong did not carefully ask Duan Gong what the solution he was talking about was, but since he said so, he should be sure of it.

In fact, tungsten copper or tungsten silver materials are undoubtedly more suitable for this situation, but this thing has nothing to do with the Carbon Research Institute. These two things are not even alloys. This thing is made by taking advantage of the non-wetting of tungsten and these two materials.

Tungsten-molybdenum alloy is also acceptable, but again, this is not something the Carbon Research Institute is good at.

However, he still mentioned it to Duan Gong: "If the problem cannot be solved, there are other materials that can solve it, but they are not graphite materials or graphite materials are not the main ones. In my opinion, graphite materials are also available. Compared with the non-copper-infiltrated silicon-infiltrated materials you have now, the tensile strength is higher, the tensile modulus is lower, and the other mechanical properties are better, but the thermal conductivity is worse."

After hearing this, Duan Gong was not interested in the graphite material mentioned by Gao Zhendong, probably because of the tensile modulus and thermal conductivity. However, the higher the tensile modulus, the better. The higher the tensile modulus, the higher the hardness, but the more brittle it is, and the less elastic and toughness it has.

After all, the Carbon Research Institute specializes in graphite materials. If Mr. Duan has no interest, then it would be inappropriate for him to continue to teach an expert about graphite materials. Perhaps the Carbon Research Institute is the professional one in terms of graphite materials.

However, I now have a certain degree of freedom in scientific research. Why not go to the Graphite Materials and Carbon Research Institute and study metal materials myself?

Anyway, I have people under my command, and the 17th Ministry of Machine Building will also strongly support my work on metal materials. This can be another way to use high-temperature materials for rockets. After all, not everything is suitable for using graphite.

Moreover, in addition to throat linings, metal materials can be used in many other places such as nozzles, gas rudders, substrates, base materials, etc. In this regard, stronger metals have a natural advantage.

After guiding them to see the dawn of solving the ground threat, Gao Zhendong has been thinking about another problem. It may be difficult for me to deal with the planes, so I will take some time out to at least help our navy and air force!
But there is no rush now, as it is almost time to get off work, so I would like to invite Duan Gong and others to have a meal in the factory. They have come thousands of miles to deliver the components, so it is only natural for me to treat them on behalf of the factory.

Engineer Duan has found the problem with the materials in his own yard and is very happy. Now he has to go through the handover procedures for some graphite components. Gao Zhendong agreed on the time and place with him and went straight to the canteen.

When I was getting lunch at noon today, I saw Sha Zhu in the cafeteria. I went over there and asked him to cook for me. Sha Zhu's cooking skills are becoming more and more famous. When middle-level and above leaders in the factory cook in the small cafeteria or entertain guests, they like to ask him to be the chef, so I have to start early.

After dinner, Gao Zhendong, Duan Gong and Sha Zhu jumped into the car that Duan Gong and his team used to deliver graphite components and returned to the courtyard together.

The car could not go in when it was some distance away from the courtyard, so several people got off the car and moved the things that Duan Gong brought into the courtyard. Duan Gong was very particular and did the moving alone, along with Gao Zhendong and Sha Zhu, without asking other people from the Carbon Research Institute to help.

Of course, at this time, the driver, especially the public one, may not necessarily pay attention to you if you ask him for help. The eight big officials are very powerful.

After moving the things into Gao Zhendong's house, Duan Gong exchanged a few words of greeting, drank two sips of water, and said that he had already recognized the place and would come again later. He said that he was tired today, so he took his leave first.

Gao Zhendong thought about it and felt that this man was truly a wonderful person.

Gao Zhendong took out two pieces of roe deer meat from the things they brought and handed them to Sha Zhu: "Well, the New Year is coming soon, one piece for you and one piece for the old lady in the backyard. It's considered a New Year's gift, haha."

Sha Zhu didn't bother to be polite with him: "That's fine, it's OK to eat it normally, but not to take it. During the New Year, I'll treat you as a big spender, haha."

Gao Zhendong suddenly remembered that Lou Xiao'e was at his place during the New Year's lunch break, so he said to Sha Zhu, "By the way, are you free at lunch time on the 29th day of the twelfth lunar month? If you are free, come to my house and prepare a meal for me. Invite Yu Shui and the old lady along, since there are only three of us in the yard and we are not dependent on each other, it would be a good idea to have some fun together."

Sha Zhu was stunned: "According to the custom in your family, eating New Year's Eve dinner at noon?"

Gao Zhendong laughed: "I'm going to Lou Xiaoe's place tonight, haha."

Sha Zhu suddenly realized: "Haha, I forgot about this. It seems that good things are coming soon. Okay, leave it to me when the time comes."

After the two men agreed on the matter, Sha Zhu said goodbye to Gao Zhendong and staggered home with two pieces of roe deer meat. He also drank a lot with Gao Zhendong and others in the factory and got a little drunk. Duan Gong and his friends were indeed from the Northeast and could drink.

Just as he reached the door of his house, someone behind him called him quietly: "Shazhu, Shazhu."

Shazhu didn't need to turn his head, he knew it was Qin Huairu just by listening to the voice.

He staggered and turned his head. Under the dim street light, Qin Huairu looked really pretty.

He was a little excited and shook his head a few times: "Sister Qin, what's the matter?"

Now, slowly, he stopped calling Qin Huairu "Sister-in-law of the Jia family" and started calling her "Sister Qin". It was unclear why, but he gradually changed his habit at some point.

Qin Huairu pointed at his hand: "What good things did you bring back today? Let me see?" Qin Huairu was also used to getting something from Sha Zhu often. Today, Sha Zhu was having dinner with Gao Zhendong at the factory and did not come back at lunchtime, so there was at least one dish missing on her table.

Today I saw Sha Zhu holding two long things in his hands. There was a faint smell of oil coming from them. Although it was not the smell of pork, it was definitely meat. Thinking of her children at home, the little funeral money left, and the upcoming Spring Festival, she simply gave it a go.

Anyway, Sha Zhu is an acquaintance and often helps my family, so I might as well be a little thick-skinned.

Sha Zhu hid the thing in his hand behind his back: "I can't give it to you. It's not from the cafeteria. Zhendong gave it to the old lady in the backyard."

He knew he couldn't do anything to Qin Huairu, so he moved Gao Zhendong and the old lady out together.

Although Qin Huairu did not dare to take Gao Zhendong's things, she knew what kind of person Gao Zhendong was.

"Don't hide it. Don't I know what kind of person Director Gao is? If there's a share for the old lady, then there must be a share for you. I don't even want the old lady's share. Give me some of your share. I'll buy it with money."

Sha Zhu thought about it and it seemed that it was not impossible. The problem now was that it was difficult to buy meat even if one had money. Maybe Sister Qin really couldn't buy meat.

Anyway, I am quite big, and I have to prepare the New Year's Eve dinner for Zhendong on the 30th day of the twelfth lunar month. According to convention, Gao Zhendong will definitely give me the leftovers.

After counting all the money, it's not impossible to give her half of it.

As he spoke, he opened the door, took out a knife and cut it in half for Qin Huairu.

Qin Huairu took half a roe deer meat and said with a smile: "Thank you, Shazhu. I will give you the money when I have more money."

Hmm? So you are here to get something for nothing?
Sha Zhu was about to retract his hand before he completely let go of Rou, but Qin Huairu's face darkened, she let go, and tears started streaming down her face.

When Sha Zhu looked at Qin Huairu's appearance, his heart softened for some reason. With such a mother-in-law, her two children would be pitiful. He would just take care of them for Dongxu.

"Okay, okay, okay, consider it as something I owe your family. Take it, take it." Sha Zhu, who was drunk, handed half of the meat back.

Qin Huairu took half of the meat and burst out laughing.

It’s really beautiful, Shazhu thought to himself.
-
After the graphite components from the Carbon Research Institute arrived, the basic debugging of the graphite components and other parts of the single crystal furnace was handed over to Yu Yuncheng and his team, while Gao Zhendong himself was debugging the various control systems of the single crystal furnace.

He planned to transfer the parameters collected by various sensors to DJS-59 and control it directly using DJS-59.

The core of single crystal furnace automatic control is equal diameter control and growth control. Apart from some other factors, the core of these two things is mainly affected by temperature and pulling speed. Therefore, precise control of the thermal field in the furnace is the core requirement of the single crystal furnace control system.

However, this control process is a typical slow time-varying process and is seriously affected by various conditions in the furnace. It is a non-minimum phase system and is difficult to control with general simulation or instrumentation.

Simply put, the typical characteristics of non-minimum phase systems are slow response, long rise time and long adjustment time. If you do not use a computer to run an algorithm for control, but rely on an analog system or instrument to control according to input, it will be very difficult and even reverse control is very likely.

When Gao Zhendong saw what he had on hand, he decided to just use the DJS-59. This thing could run the PID control algorithm directly. Although it was a bit wasteful, he could just make it first. At worst, he could apply for another one.

He believed that as long as silicon single crystals could be produced, the 59th Ministry of Machine Building would have no objection to equipping a single crystal furnace with a DJS-, and would even hope to equip several more sets. Besides, there would be other ways to solve the problem later.

Different from the ESR power supply, the power supply of the single crystal furnace this time needs to adjust its output power at any time to control parameters such as the temperature and melting speed of silicon in the thermal field.

Therefore, the control system this time also controls the power supply, but the rectifier inverter power supply at this time is not as easy to use as it will be in the future.
In the future, power supplies at least used half-controlled thyristors (silicon controlled thyristors) as power components, and later there were even better ones such as fully controlled GTOs (gate turn-off thyristors) and IGBTs (insulated gate bipolar transistors).

But now there are none, there are only devices such as mercury arc thyratrons and high-power electron tubes, whose switching speed, amplification performance and other indicators are very different from the above-mentioned semiconductor power devices.

As for why there is no such thing, look at the names of these power devices: semiconductor power devices, and then look at what Gao Zhendong is doing now? Isn't he pulling silicon single crystals?

This is a chicken and egg question. Fortunately, it can be used. It is not perfect, but it solves the problem of whether it exists or not.

(End of this chapter)