Chapter 174 New Problems at the Carbon Research Institute (3k)

Different from the structure of the OSI seven-layer network model that Gao Zhendong learned in his previous life, the simple network that Gao Zhendong prepared to build this time is a bit like a private data transmission protocol family that he was going to implement in his graduation project in his previous life. It completely abandons the OSI seven-layer model. The application layer is one layer, and below that, except for the physical layer, all the rest are compressed into one layer, controlling the number of communication layers to three layers, as long as it can run.

This is actually quite close to the idea of ​​TCP/IP. TCP/IP actually has only four or five layers. It is not very clear whether it is four or five layers, and everyone has their own opinions.

The OSI seven layers are an idealized model, and idealized things have a flaw: they don't pay much attention to reality and are a bit out of touch with reality. To fully implement these seven layers, in simple terms, some things are redundant and a waste of resources.

TCP/IP was born from practical applications. It is more down-to-earth. In order to achieve more reliable network transmission under the hardware environment and communication resources around the 70s, we should try to save as much as possible.

Gao Zhendong had the same idea, and was even more extreme: it was fine as long as it could run, but he could use the ready-made telnet and ftp protocol header information to assist in controlling the handshake and transmission. If others had already done it, he could just use it.

The modem in Gao Zhendong's hand also has a system bug. Although everything is based on existing technology, there is a future function that can be realized by using existing technology.

——That is to implement the AT command set to control the basic operations of the modem such as dialing. Although it is not as complete as the future AT command set, the basic part is there.

It’s a pity that in the current context where telephones rely on manual exchanges, this thing is of little significance for the time being.

The modems at that time were very difficult to use. They relied on the sound from the telephone receiver and something called an "acoustic coupler" to work together to successfully connect. And this system remained the same even after the program-controlled switching telephone network had become popular in the West.

It was not until the 80s that Hayes invented the intelligent modem, which enabled the computer to directly control modem dialing as mentioned above.

What’s interesting is that among the early famous hackers, there was one who could dial into the Internet simply by using his mouth to simulate a telephone dial tone. He took advantage of this defect in the acoustic coupler, and his mouth was really powerful.

Just when Gao Zhendong was struggling with network transmission, Yu Yuncheng came to him, probably because he had encountered some minor problems.

"Director Gao, when we were debugging the temperature measurement system, we found a problem that is not easy to solve."

"What's the problem? Tell me." Gao Zhendong gave them a principle design, which was relatively complete in terms of major aspects, but might not be so complete in terms of some small details. It was normal to have some small problems.

"Regarding the temperature measurement problem, the accuracy and precision of the thermocouple are fine, but because it is on the furnace, the sensitivity is not enough and the response is slow. This thing cannot be sent to the center of the furnace, so it is not easy to solve this problem. The thermocouple is made by you, and I want to see if its sensitivity can be improved."

Gao Zhendong thought about it and realized that this problem really cannot be solved by using the thermocouple method used in automatic fire extinguishing of tanks. This thing has to work in a high temperature environment for a long time, but there is still a way.

"In this way, we don't have to worry about the thermocouple itself. If the heat doesn't come, you can ask it to come. You can try to make a condenser with quartz glass in front of the thermocouple to focus the light in the furnace as much as possible on the thermocouple. In this way, the reaction speed should be able to increase. It's just a matter of recalibrating the corresponding relationship between the thermocouple temperature and the furnace temperature.

When Yu Yuncheng heard this, he thought, wow, this is a good idea, simple and direct, it solves the problem in a roundabout way, it really has to be Director Gao.

"Haha, this is a good idea. We don't need to spend time and effort to mess with the thermocouple. Adding a piece of quartz glass will solve the problem. I'll go try it now. By the way, Director Gao, the people from Northeast Carbon Research Institute are here and are unloading the goods. Do you want to go and take a look?"

Upon hearing this, Gao Zhendong put down what he was doing and went to the single crystal furnace laboratory with Yu Yuncheng.

The graphite components manufactured by Northeast Carbon Research Institute for the Third Steel Rolling Mill, such as heating bodies, electrodes, and thermal insulation covers, have arrived. Together with the graphite heating bodies and quartz crucibles, the main equipment for the thermal field is basically complete.

This time, it was Duan Gong who personally escorted the car over, which surprised Gao Zhendong a little. He didn't need to come here in person for this thing.

Upon seeing Gao Zhendong, Duan Gong laughed out loud: "Haha, Director Gao, here I come again! This batch of components of yours was personally taken care of by our dean, and I was supervising them all the way. The quality will definitely meet your requirements."

Gao Zhendong thanked them repeatedly: "Thank you so much, I may have to trouble you often in the future."

Graphite components are not installed once and for all, some parts need to be replaced, a bit like consumables, so Gao Zhendong said this.

Duan Gong laughed and said, "It's not a big deal. That's what we do, haha."

After saying that, he winked at Gao Zhendong.

It seemed like he had something to say, no wonder he came here in person.

Gao Zhendong nodded, handed over the unloading, inspection and installation tasks to Yu Yuncheng, and took Duan Gong to his office.

After entering Gao Zhendong's office, Duan Gong told him the purpose of his visit.

"Director Gao, it's just a small matter. It's New Year's Day, and I found some New Year's goods and brought them to you. Haha, they are not rare things. I will ask someone to send them to your home later." Knowing the style of this rough-looking but meticulous Duan Gong, Gao Zhendong smiled and thanked him. What came over there were all good things, some of which could not be found in his own system.

After talking about this truly trivial matter, the next thing Duan Gong talked about was not a trivial matter at all.

"The second thing is that I'm here to ask for your help."

"Ask for help?" Gao Zhendong was a little surprised. He had explained everything about graphite to him before. After thinking about it, he remembered that there was also the matter of pyrolytic graphite. He felt embarrassed last time and did not continue listening.

It seems that we need to work on pyrolytic graphite now?
Gao Zhendong smiled and said, "What about pyrolytic graphite? No problem."

But Duan Gong's answer was somewhat beyond his expectations. Duan Gong shook his head and said, "No, it's about the copper-infiltrated graphite throat lining material. It's about where it's going to be used. I can't tell you, but I can tell you the specific situation and related parameters. I would like to ask you to give us some advice."

Gao Zhendong almost laughed out loud. What’s the difference between what you said and what I have said before? Where else can this thing be used?
He still has the technical consultant appointment certificate from the Carbon Research Institute. This is probably why he said he actually has no concerns and is just pretending.

"Yeah, it's okay. What's the problem? Tell me."

What Mr. Duan said is actually a very simple matter.

The graphite copper-infiltrated material that Gao Zhendong taught them to make has relatively high strength and good ablation resistance, so it is prepared to be used in another occasion where similar materials are needed.

However, after testing, they found that the anti-ablation performance decreased significantly. Under the erosion of high-pressure airflow, mechanical erosion was quite serious. This left them puzzled. According to theoretical calculations, the strength of this material meets the requirements of this usage scenario.

Moreover, it was also used smoothly on the infrared air-to-air missiles of the Missile Research Institute. In fact, the working pressure difference between the two was not too large, so it should not cause such a degree of performance degradation.

The Carbon Research Institute thought about it and couldn't find the reason, so they simply took the opportunity of transporting the components to come and find Gao Zhendong. Firstly, they wanted to bring some New Year's goods and deepen their relationship, and secondly, they wanted to ask him in person, maybe there was a solution.

At least, we have to find out the cause before we can proceed to the next step of research, otherwise we won’t even be able to find the direction.

Gao Zhendong carefully inquired about the working conditions when the problem occurred and had a rough idea in his mind.

"Duan Gong, it sounds like the working time of your new application has far exceeded the working time of the Institute of Guidance Research's products, right?"

"Yes, that's right. But in theory, as the working time increases, the degree of ablation will increase, but the ablation rate, or the ablation speed, should be maintained within a certain range. However, the current performance is decreasing sharply, mainly due to mechanical erosion caused by airflow impact."

Gao Zhendong smiled and said, "You think the mechanical strength of copper-infiltrated graphite is sufficient according to calculations, and this situation shouldn't happen?"

"Yeah, that's right, this is where we pick our heads. It's enough when we count it, but it collapses when we use it."

Gao Zhendong smiled and said, "Duan Gong, think about it, will copper melt?"

"Burning and melting?! Oh my goodness, Director Gao, you really woke me up!"

When Duan Gong heard Gao Zhendong's simple words, he suddenly understood.

The strength of graphite copper infiltrated materials is tested at room temperature. Since the copper is solidified and intertwined with the graphite material, its strength must be very high.

However, when in working condition, copper is burned into liquid. At this time, it only acts as a sweating material, evaporating and taking away heat, and it does not contribute much to strength.

The rocket engine of the infrared air-to-air missile has a short working time, so this problem is not prominent.

However, this problem arises in engines that work for a long time. In the early stage, the copper has not been completely melted, so the engine can work well. But later, when the copper is completely melted, the engine's ability to resist mechanical erosion caused by high-pressure airflow will be impaired.

Duan Gong was so excited that he danced with joy in Gao Zhendong's office: "Haha, Director Gao, thank you so much. Such a simple problem has troubled us for a long time. Now that we have found the problem, we can find a way to deal with it."

If you can't find the problem, you can't take targeted measures. Now that you know the problem, it's much easier to deal with. To put it bluntly, the dumbest way is to exceed the weight target and make the thing thicker. Since it burns faster, I'll add more and let you burn a little longer.

(End of this chapter)