Hanging up the phone, Chen Nian looked at the engine data sheet in front of him that had taken shape, and was secretly a little proud in his heart.

The so-called data problem mentioned by Lei Gang is actually the problem of matching and connecting various parts of the engine, and in the final analysis, it is a problem of tolerance.

Why is it difficult to reverse engineer aero engines?

Why do you say that even if you put the airline in front of your eyes and let you dismantle it at will, you can't build it?

In fact, to put it bluntly, in addition to the hard index of the material, the word "tolerance" can be fully explained.

A very simple example, let's say a part is 10 nanometers in size, but you don't know its tolerances, so when you build it, do you build it according to 10 nanometers, or do you build it according to 9 nanometers?

If it is 10 nanometers, it is best to be able to restore 100 percent, but the problem is that there will be tolerances when you manufacture it yourself, and the part will become 11 nanometers, breaking out of the tolerance range, then the part will be scrapped.

As for some people who say, then I will do it directly at 10 nanometers, and it will not be strictly reproduced?

.

If your machine and process can guarantee that if you make 10 nanometers, you will make 10 nanometers, then you are still doing fart reverse engineering.

This technology alone, not to mention what you can make, just by making some technical patents, you can exchange it for the design drawings of the aviation engine.

Therefore, standard dimensions and tolerances are indispensable, and it is precisely this problem that Lei Gang said.

Standard size and tolerance, this is a golden finger, can hit these two data to a relatively reasonable range at one time, that can save the project team a lot of trial and error costs.

Perhaps hundreds or thousands of experimental steps that used to be required will only require a few dozen, or even less than ten.

In this way, the magnitude of the efficiency improvement is self-evident.

And now, Chen Nian has mastered such a "golden finger".

He pondered for a moment, added a few more pieces of data to the paper, and then put down his pen.

At this time, on this piece of paper, the data of the core components of the engine are all complete, including the combustion chamber, flame cylinder, press and other key parts, and even the process required for processing.

Of course, because there is no specific analysis, these processes are just a name and have no guiding significance.

But even if it's just that, this drawing can be said to be priceless.

Any country in the world, including the United States, which built the F119 engine, would do whatever it took to snatch it if it knew of the existence of this drawing.

Because they will not allow their key technology to be left behind, let alone allow those who have mastered this technology to live in this world.

After thinking for a moment, Chen Nian burned the drawings, then split the parts into parts and began to transcribe the data one by one.

He planned to wait for the transcription to be completed and then hand over the data to Lei Gang in batches.

In this way, even if a leak occurs in the process, the data of a single part is not enough to attract the attention of the opponent.

While the workload inevitably becomes larger, it is definitely a necessary action.......

.......

After a whole night, Chen Nian finally completed the transcription of all the key data, he put the thick notebook in his bag and carried it with him, and then went to the "classroom" next door to his residence according to the course arrangement, ready to start today's small class.

The teacher in the class is called Hu Xu, an expert in aerospace materials science in a research institute, and he mainly gave Chen Nianjiang the content of materials science.

Since Chen Nian had a certain foundation before, he did not start with the most basic content, but tried his best to ensure that the course was in line with the general direction of Chen Nian's aircraft design, and most of the time he spent talking about titanium alloy casting, and the core was internal crystal defect treatment.

“....... There are a large number of pores between the loose powder particles, and due to the irregular shape and uneven surface of the powder particles, they are mostly in point contact with each other, so the number of other particles in direct contact with one particle is very small.

When an external force is applied to the powder, under the action of compressive stress, the following situations may occur in the powder: the randomly stacked powders will be translated or rotated closer to each other; Some of the powder is squeezed into the adjacent voids......"

"This stage is called approach and rearrangement, and after that, it will enter the plastic deformation and diffusion creep stages."

"Of course, these three phases are not completely separate, but work at the same time to promote the densification of the powder."

"So Xiao Nian, now can you understand why hot isostatic pressing can solve the casting problem of most titanium alloy materials?"

Speaking of this, Hu Xu paused slightly, he looked at Chen Nian who was sitting opposite, waiting for Chen Nian's answer.

In fact, at first, he was extremely reluctant to ask him to teach a freshman student.

After all, my academic status is there, and those who usually listen to my lectures must at least be at the level of doctoral students or above.

Such students, no matter what they teach, can understand everything they can learn as soon as they learn, and what they have to do is just to constantly put forward new directions for them and give them some inspiration at critical times.

And what about Chen Nian?

An amateur player with a weak foundation, it took him two whole days to understand just what seemed to him the simplest crystal growth model.

What's the point of teaching such a student?

He wanted to stop, but because of the instructions of his superiors, it was difficult to refuse.

So his first two classes were actually very perfunctory.

---- until one day, his superiors suddenly found him, informed him that he had entered the secret sequence of Project 22, and revealed to him Chen Nian's identity and contributions during this time.

Completed the key design of an important aircraft, proposed the industrial manufacturing process of two new materials, and saved a huge amount of national property, promoted the establishment of a project, and took the initiative to undertake key work by verifying and pointing out the major technical defects of a key project......

What the hell is this that a student can do?

I've been doing research for decades, and what I'm pursuing is just one of them!

And it only took him a few months to complete the Grand Slam......

So, everything changed.

In his eyes, Chen Nian is no longer Chen Nian, but Xiao Nian.

Freshmen are no longer freshmen, but a rising star......

"Because of synchronous and uniform heating, the movement of the internal molecular structure is affected by static pressure and can be transmitted uniformly in all directions, which makes the compressive stress on the contact surface of the particles, reduce the shear stress, and even if it is a brittle material, it can be stably processed plastic."

"That's right! Learn fast! ”

Hu Xu nodded happily, affirmed Chen Nian's answer, and then continued:

"Not only that, the hot isostatic pressing method can well eliminate the participating voids in the product and reduce the void volume, which can greatly improve the performance and life of the product......"

The two asked and answered, Chen Nian raised a targeted question from time to time, and Hu Xu also patiently answered.

It wasn't until more than three hours later that all the content of the booked course had been completed, and both of them were still a little unsatisfied.

Looking at Chen Nian, who was taking notes seriously, Hu Xu said sincerely:

"Xiao Nian, your talent in materials science is not the highest I have ever seen, but your heart is definitely the best."

"Not only the mind, but also the overall vision is also very good."

"You're not like most beginners, you learn what you learn, you study one subject, and it naturally connects to other subjects."

"This kind of vision is rare, if you can stick to it, your achievements in the future will definitely be more than that......"

Chen Nian smiled and replied:

"I just want to learn more, and I'll definitely be able to use it in the future."

"By the way, Professor Hu, I still have your class the day after tomorrow, I see that the class schedule is to continue to talk about titanium alloys, but I have a new idea recently, I want to learn ceramics first, can you arrange it?"

"Yes, why not! If I adjust the class schedule, it will definitely not affect our overall thinking. ”

Hu Xu agreed, and Chen Nian nodded gratefully.

After another lesson, the number of source points he had accumulated successfully reached 0.26 points.

So, he's going to start "spending money".

The object is the ceramic-based TBC material, which is a key material in engine technology......