Start with the aviation industry

Chapter 313 World-class craftsmanship
Absorbing material, also called absorbing coating.

The most important reason why this stealth strategic bomber has such outstanding stealth performance is not that its shape is designed with a radar reflective surface, but because it has a layer of wave-absorbing coating that absorbs radar waves and basically no longer reflects them back.

In this way, whether it is ground radar or air radar, it is almost impossible to detect the existence of this stealth strategic bomber, thus achieving perfect radar invisibility.

If the wave-absorbing coating of stealth aircraft is also divided into two generations, then the one on the beautiful country B2 stealth bomber can be regarded as the first generation, and the wave-absorbing coating of Leihuo Technology Industrial Group can be regarded as the second generation.

Compared with the first generation, it absorbs radar waves more efficiently, has a longer service life, lower daily maintenance costs, more convenient maintenance, and lower manufacturing costs.

It took Lin Feng two or three days to write out the entire production process of this wave-absorbing coating. After printing out, there were dozens of pages, full of pictures and texts, and detailed process parameters.

It is not an exaggeration to say that with this set of process materials, as long as there is a certain foundation and equipment, many domestic non-metallic material companies can produce this kind of wave-absorbing material.

Printing, binding.

Lin Feng flipped through it, and found that there was nothing wrong with it. It was exactly the same as the crafting material in his mind, almost equivalent to the original version.

"The whole set of process information has been released, and we can start production. First, make a batch, and then do a test to see if it is as good as the system says."

"Well, where is the production, such an important thing must be in our own company"

After thinking about it for a while, Lin Feng felt that the production would be temporarily placed in the non-metal material workshop of Leihuo Helicopter Company. In the future, it is estimated that a special production workshop will be established for more specialized production.

Phoenix Aeroengine Design Institute.

Zhong Jianming, the chief model engineer, undertook another task, which was to absorb technology based on the turbofan engine of the Phoenix factory, improve the design, improve performance, and make technical reserves for future medium and small military turbofan engines.

He now has a major design improvement project, which is the development of single crystal superalloy turbine blades.

The purpose is very simple, to develop a brand new single crystal superalloy blade, and then carry out design verification on this turbofan engine, and accumulate design technology, especially the accumulation of a series of design parameters.

After accumulating enough technical experience and having a sufficient foundation, after understanding this single crystal superalloy turbine blade, it can be extended to more models in the future, including turboshaft engines.

The development of aero-engines is such a step-by-step verification, accumulation, improvement, and re-verification, step by step.

The design drawings of single crystal superalloy turbine blades have been drawn long ago. Simply drawing the design drawings is still a little easier. At most, it involves a series of complicated calculations. Now that there are calculations, these calculations are not as difficult as before. and time consuming.

After the design drawings are drawn, of course it is the production and manufacture of the first batch of single crystal superalloy blades.

This task was given to Phoenix Factory.

In the precision casting workshop, compared with the previous ones, there have been quite a few changes here. Some imported equipment has been obviously added, and the precision casting capacity has been further improved.

The manufacturing site is steaming. Some parts have just been poured and are releasing a lot of heat. The moisture in the wet molding sand is evaporated, forming a white mist.

Zhong Jianming, Wang Tianfang and others were at the manufacturing site, and another batch of single crystal superalloy turbine blades were being taken out of the mold one by one by the workers, and placed on the inspection table next to them one by one.

Zhong Jianming said hopefully, "Mr. Wang, this is our seventh casting, and some of the blades should be qualified."

Wang Tianfang said, "I hope so, even if there is a [-]% or [-]% pass rate!"

The precision manufacturing of this turbine blade uses a very cutting-edge process technology, called "Nickel-based single crystal superalloy directional solidification" technology, which is also the biggest technical breakthrough of Phoenix Factory and Phoenix Institute.

Repeated demonstrations, repeated trials, and repeated failures, so far this is the seventh attempt at precision manufacturing. The equipment used is also imported, and the process capabilities, especially the control of the casting temperature, are more precise.

A total of about [-] pieces of casted single crystal superalloy turbine blades were finally taken out of the mold and placed neatly on the inspection table.

In addition to Wang Tianfang and Zhong Jianming, there are many other technical directors, even technical ministers, who are a little excited and hopeful in their hearts.

If they succeed this time, even if they only need a pass rate of [-]% or [-]%, it means that they have initially mastered this cutting-edge technology.

The first is visual inspection.

Wang Tianfang and Zhong Ziming put on white gloves one after another, held a magnifying glass in one hand, and took a random turbine blade with the other hand and looked at it seriously.

In addition to the two of them, of course there are two quality inspectors, and they will also start to check carefully.

"Well, this blade is fine, there is nothing wrong with it, and the appearance is normal."

"This piece is also good."

"."

After some inspection, only three of the [-] single-crystal superalloy blades were unqualified, and there were obvious defects, such as shrinkage porosity, or simply slag inclusions.

"Boss Wang is not bad, at least seventeen pieces are qualified in appearance."

Wang Tianfang nodded, "I remember that there were a total of [-] blades last time, and nine blades were scrapped due to appearance problems, which is three times as much as this time."

"From the appearance, this batch of blades has made great progress. I really hope that some of them will finally pass the test."

The last time was the sixth casting attempt, nine of the [-] blades were scrapped due to appearance problems, and then a few more were scrapped during the non-destructive inspection. The final metallographic inspection was completely wiped out, and none of them passed the test.

After careful analysis, experience summarization, and optimization of process methods and parameters, this is the seventh attempt at precision casting. Everyone hopes that at least some of them can pass the test, so as not to get another big zero.

Annihilation of the whole army is very shocking!
Even if only three or five pieces are finally qualified, it is a huge progress, and it can be regarded as a preliminary mastery of the directional solidification technology of single crystal superalloys.

After the visual inspection, this batch of blades was sent to the non-destructive inspection room for fluorescent inspection, and Wang Tianfang and others followed.

The situation is fine!

Only two of the [-] leaves had problems, and the remaining [-] were qualified. This pass rate is the highest so far. All of a sudden, the hope in everyone's heart is stronger.

"It seems that this time it will succeed!"

"It's not easy. The previous six times in a row were zero eggs, and now I finally see hope!"

"I'm a little excited. This is the directional solidification technology of single crystal superalloy. Is it going to be mastered by us!"

"."

The technicians next to each other cheered up and talked happily there, as if they saw great hope at once, and the dawn of success seemed to be in sight.

As the leaders, although Wang Tianfang and Zhong Ziming did not participate in the conversation with everyone, it could be seen that the faces of the two were still good, and they probably were in a good mood.

The most critical metallographic inspection has also begun.

Each turbine blade has redundant sampling materials. A little metal material will be removed from it and put under a special metallographic microscope for inspection. This microscope is also a type of electron microscope.

The metallographic inspection of single crystal superalloys is generally magnified by 3000 times, so that the metallographic structure can be seen more clearly. Director Song of the metallographic room is in charge of the inspection.

Careful people noticed that Director Song frowned slightly, and then everyone also saw the display of the metallographic structure on the microscope's display screen.

How could this happen!
Some knowledgeable technicians thumped in their hearts and showed worry on their faces. The metallographic structure of the first turbine blade was unqualified, which is not a good sign.

What is a single crystal refers to the grain structure of this metal. Their size and direction need to have relatively high consistency, but the metallographic phase of ordinary nickel-based superalloys is not like this, and the grain structure size is not strict. There is no requirement for the direction and direction, as long as there are no micro cracks.

The inspection of the second film will start soon, and the situation is still the same, still unqualified!
Then the third piece, the fourth piece.
After checking seven or eight pieces, the atmosphere at the scene became a little frozen, and even those technicians who didn't know much about metallography knew what was going on.

Director Song also looked frustrated, and even asked, "Mr. Wang, do you want to continue the inspection?"

The meaning is obvious. Seven or eight tablets have been inspected in a row and all have problems.

Wang Tianfang gritted his teeth and said, "Continue to check, everything has been checked."

If you want to die, you have to understand, and if there is a miracle, one or two of the remaining seven or eight single crystal turbine blades are qualified.

Unfortunately, such a miracle was not found.

The subsequent seven or eight turbine blades were also inspected, and all of them were unqualified. This time, they got another big duck egg, and the whole army was still wiped out.

Everyone was hit hard!

The atmosphere at the scene was gloomy, everyone was very depressed, and Wang Tianfang and Zhong Ziming had bitter expressions on their faces. They really thought about this result.

After all the original inspections were completed, Wang Tianfang would immediately hold a technical analysis meeting in person. Everyone sat together to brainstorm, discuss the reasons for the failure, sum up experience, and then improve the process.

But not this time, Wang Tianfang was a little hit, and he didn't feel that way for the time being.

in the office.

Wang Tianfang and Zhong Ziming sat on the sofa and didn't want to move. The hot tea on the coffee table was completely cold and they didn't take a sip. It took a long time before Zhong Ziming opened his mouth.

"Mr. Wang, failure is the mother of success. Let's take our time. We still have time. If we do it a few more times, I don't believe it won't be successful."

Wang Tianfang said in a low voice, "That's the only way, let me adjust my mood first, and I will call everyone for technical analysis and discussion in two days."

Zhong Ziming said, "I will also attend this meeting, let's participate in the discussion together."

The two chatted about this matter for at least one or two 10 minutes, and the mood gradually improved. After all, this is a world-class key craft, and it is not easy to succeed.

After feeling better, the topic became wider, and the two gradually chatted about Leihuo Technology Industry Group.

Zhong Ziming said enviously, "Leihuo Technology Industry Group is developing well now. They not only established the Leihuo turbofan engine company in Shenhai City, but also built a professional aircraft factory in Jianghai City."

Wang Tianfang said, "They are developing really well. It can be described as 'rapid development'. The Leihuo Technology Building in Shenhai City is the tallest building in the world, with a height of more than 600 meters."

Now that we have talked about Leihuo Technology Industry Group, we will naturally talk about the LH165 turbofan engine.

"Mr. Wang, you should be familiar with the LH165 turbofan engine of Leihuo Technology Industry Group." Zhong Ziming asked.

Wang Tianfang nodded.

Compared with Zhong Ziming, he has a much more comprehensive understanding of this engine, because he has a good relationship with Lin Feng, the two often communicate with each other, and have talked about this engine several times. Lin Feng once briefly introduced it.

Zhong Ziming was different. Although he was engaged in the design of aero-engines, his relationship with Lin Feng was so-so, and he had little contact with him. His knowledge of this engine was limited to rumors.

That is to say, I have heard other people talk about this engine and know that such an engine exists, but I really don’t know the main performance parameters of this engine.

Because of the relatively high level of confidentiality, Leihuo Technology Industry Group has never officially announced the existence of this engine, and it is even more impossible for some performance and parameter introductions to appear in some newspapers and professional materials.

"Mr. Wang, I heard that this is a world-class small-bypass military turbofan engine. I don't know if it is true."

If he heard that other aviation companies were building a world-class military turbofan engine, Zhong Ziming would not believe it.

The Leihuo Technology Industrial Group is different. They have even produced world-class turboshaft engines, and by the way, there are also world-class heavy-duty armed helicopters.

Facing the question, Wang Tianfang said, "Yes, it's true, Mr. Lin even introduced this engine to me."

"Then tell me about this engine. I'm curious as to what kind of engine it looks like."

Wang Tianfang hesitated for a moment, and thought in his heart, simply speaking, it should not be considered a leak, so he introduced, "This is a turbofan engine with a small bypass ratio, with a single thrust of 165 kN. Can reach 245 kN”

After listening to the introduction, Zhong Jianming didn't come back to his senses for a long time.

Although there is a certain amount of mental preparation, this engine is too advanced, it is really the world's top level, much better than the F119 engine in the beautiful country.

Great, so great!
As expected of Leihuo Technology Industrial Group!

In deep admiration, Zhong Jianming suddenly thought of something and asked, "Mr. Wang, such an advanced and excellent engine must have used some new materials. The turbine blades should also be made of single crystal superalloy. .”

Wuyou nodded and said, "It should be. After all, the thrust-to-weight ratio of this engine exceeds 12. If the single-crystal turbine blades are not used, the temperature in front of the turbine will not increase, and the thrust will not increase."

Zhong Jianming's eyes lit up.

"Mr. Wang, since this engine also uses single-crystal superalloy turbine blades, has Leihuo Technology Industrial Group already mastered the directional solidification technology of nickel-based single-crystal superalloy?"

Wang Tianfang's eyes also lit up, yes!

How could he have forgotten such a major event? If the Leihuo Technology Industry Group had already mastered this technology, it would be completely unnecessary for him to spend a lot of manpower and material resources on tackling key problems.

Wuyou thought in relief, he is all to blame. The contact with Lin Feng has obviously decreased a lot in the past year. It seems that this is not possible. The relationship between the two must be maintained. What is the movement of Leihuo Technology Industry Group? You'll also know that it's much easier to ask for help if you need it.

"Mr. Zhong, I heard Mr. Lin mentioned that their turbofan engine has already started the full-scale production of parts and components. It is likely that they have mastered the directional solidification technology of single crystal superalloys, and may even be the first batch of single crystal superalloys. The leaves are all out."

The two became eager.

Zhong Ziming even suggested, "Mr. Wang, you and Mr. Lin have a good relationship. When will we find time to go to Leihuo Technology Industrial Group, sit down and have a good chat with Mr. Lin about the development of single crystal superalloys?" matter."

"This suggestion is fine. I haven't been to Leihuo Technology Industrial Group for several months, and I haven't seen Mr. Lin for several months. I only call occasionally. I really should move around more."

Then, Wang Tianfang picked up his mobile phone and called Lin Feng.

Leihuo Technology Industry Group.

Lin Feng is at Leihuo Helicopter Company. He just went to the helicopter assembly workshop to see the assembly of the Tianlong transport helicopter and the Veyron heavy-duty armed helicopter.

Happily, the helicopter company received another foreign trade order a week ago. A country in Southeast Asia ordered a total of 20 foreign trade version of the Tianlong transport aircraft. Originally they wanted to order ten small Veyron gunships, but they are still negotiating .

Whether it is a Tianlong transport helicopter, a small Veyron armed helicopter, or a Veyron heavy-duty armed helicopter, their orders are all scheduled after next year.

After looking around the helicopter assembly workshop, Lin Feng now walked into the non-metal material workshop of the helicopter company.

In this professional factory building of more than 1 square meters, many of them are imported equipment, and many workers are also busy. Many metal parts can be seen in the manufacturing site, such as composite rotors.

Lin Feng came over to take a look in person, of course not to see the production of these parts, but for the production of the absorbing material for this stealth strategic bomber.

A few minutes after entering the non-metal material workshop, the cell phone in Lin Feng's pocket rang. He took out the cell phone and saw that it was Wang Tianfang calling.

Lin Feng thought to himself, Mr. Wang hasn't contacted me for at least half a month. This time, I don't know what happened.

(End of this chapter)