Not only Professor Zhao has this feeling, but Tong Xia and Wu Ping are also the same.

As long as you are engaged in helicopters, there is no one who does not care about the performance of the bearing, as long as you care about the performance of the bearing, you will not know the excellence of silicon nitride bearings.

You must know that in addition to the long-term incurable heart disease in the field of domestic helicopters, the biggest difficulty is high-end bearings.

This is also why the introduction of relevant technology from abroad, is to want to do it in one step, to raise their own level, from the effect point of view, part of the technology has indeed achieved the effect, but those high-end core technologies are still unable to break through.

There is no other reason, just because those high-end core technologies are not to get some samples and do a physical and chemical analysis to make them according to the gourd painting scoop, but to need the accumulation of multiple basic disciplines and slow exploration to gradually form their own things.

In other words, there are no shortcuts to these high-end technologies.

For example, the turboshaft engine on the helicopter, as the introduction of the "Dolphin" helicopter supporting the turboshaft 8 can be gradually localized according to the technical indicators of the French, but it is also localized, and if you want a turboshaft engine with higher power, the manufacturer of turboshaft 8 can borrow the convenience of turboshaft 8 is not much, and you still have to turn around and start again.

Because the aero engine is a test of skills and accumulation, there is no room for opportunism, and only by going through all the processes step by step can we say that we can complete the first step of the Long March.

The balls in the high-end bearings are the same, don't look at the inconspicuous thing, even the stone polishing is not inferior to those balls in terms of appearance, but the inside involves extremely high-end materials science and manufacturing technology.

Take silicon nitride bearings as an example, we all know that this thing is good, but in addition to the United States in the world to apply it to the field of helicopters on a large scale, Europe and the Soviet Union are also considered to have developed aviation technology, but there is no large-scale application, why?

But it's such a high-end thing, Tengfei Group is actually called the product of experimental failure, just a small thing in exchange for pocket money, oh my God, what kind of freak is this Tengfei Group!

Fortunately, Tong Xia and Wu Ping just thought about these words in their hearts, if Zhuang Jianye and Liu Chun listened to them, the two would definitely point fingers at the sky and swear that they really didn't deceive people.

Because silicon nitride is really something that the experiment of Tengfei Aviation Technology R&D Center failed.

As for what experiments, then it is high-end, a certain long-range missile divides the external heat insulation material of the warhead.

You must know that Tengfei Aviation Technology R&D Center has only done one thing for so many years, that is, carbon fiber materials, and carbon fiber reinforced composite materials derived from this are one of the major branches.

It is divided into two categories, one is carbon fiber reinforced metal matrix composites that have begun to be widely used in the aerospace field, and the other is carbon fiber reinforced ceramic matrix composites.

The former can be used as the main material of the aero engine or long-range missile body, while the latter is the necessary technology for the lifting of key components such as the combustion chamber and turbine blades of the aero engine and the loading of the warhead of the long-range missile.

As we all know, the only way to improve the performance of aero engines is to increase the temperature before the turbine and increase the thermal efficiency, but the general metal materials simply cannot hold on to the high temperature of more than 1,000 degrees for a long time.

So the engineers wondered if it would be possible to coat the heated parts of an aero engine with a layer of heat-resistant material to increase the operating temperature of the combustion chamber, turbine and turbine blades.

In this way, high-end ceramic materials have entered the field of vision of aero engine engineers, because the stiffness and strength of ceramic materials are good, and more importantly, the heat resistance of ceramic materials is very good, generally at 1800 to 2000 degrees Celsius.

The same is true for the loaded-in warhead of long-range missiles, which will generate a large amount of heat energy due to the friction with the air in the atmosphere when falling at high speed, and if it is not protected, the warhead will be burned directly by the atmosphere like a meteor before it hits the target.

Historically, alloy steels have been used with thermal barrier coatings to resist the high temperatures of re-entry.

However, this will increase the weight of the warhead, reduce the weapon load, and reduce the attack efficiency, so the world's major powers have carried out research on lightweight heat-resistant materials in order to apply them to the warhead, so as to increase the weapon load.

As an important supplier of materials to the aerospace sector, the Ascendas Aerospace Technology R&D Center undertakes research in this field, just like the materials research institutes of other aerospace sectors.

And soon based on its own advantages, it came up with a carbon fiber reinforced ceramic matrix composite material scheme, and in the past year or so, four carbon fiber reinforced ceramic matrix composites have been developed: zirconia, zirconium boride, silicon carbide and silicon nitride.

After the technical verification of the aerospace department, zirconium boride and silicon carbide have become the materials for the new long-range missile load-in warheads, and the other zirconia and silicon nitride have been beaten back.

If this is done by other research and development units, it is estimated that the failed products that come back will be thrown into the pile of old papers and become the so-called "technical reserves".

However, Tengfei Aviation Technology R&D Center is not an ordinary technology R&D unit after all, and the benefits brought by the transformation of technological achievements for many years have long been deep-rooted.

If the thermal barrier material for aerospace is not used, can't its own aero engine be used? Therefore, after more than half a year of stuffy research, it was found that zirconia can be used as a coating material for the combustion chamber and turbine blades of the engine to improve the thermal efficiency of the aero engine before the turbine.

In contrast, silicon nitride is not so lucky, due to the nature of the problem, the silicon nitride coating is easy to fall off when it is told to run, and cannot be used as the core material of aero engines, so the attention will naturally be lowered to a higher level, and it will naturally not get the full support of the group.

After all, it is the result of such a long time, and it is too much of a loss if it does not make some money, so according to the nature of silicon nitride, Tengfei Aviation Technology R&D Center will change it to the main material of machine tool cutting tools and bearings, and sell it to various branches according to the group's internal pricing and commission model.

Liu Chun came here this time to hear from people from other branches that the batch of machining tools and bearings made by Tengfei Aviation Technology R&D Center are not bad, and he came to see if they can use them in the aviation power plant.

But I didn't think that because of the good performance of the machining tool, I didn't get it, so I only got two bearings and prepared to take them back to test them to see where they could be used.

As a result, I didn't expect that even the low-end goods that Tengfei Aviation Technology R&D Center earned pocket money could make the old professor of Beihang in front of him react so much, could it be that Tengfei Aviation Technology R&D Center has done something amazing?

"Brother Zhao, don't get excited, this thing has to be tested for progress if it doesn't work, if not, aren't you happy in vain?" Seeing Professor Zhao's suspicious appearance, Liu Chun was also taken aback, and hurriedly opened his mouth to comfort: "What's more, this bearing is still welded by two low-carbon steels, and it is not as solid as casting." ”

"Welding?" Professor Zhao finally came back to his senses when he heard this, and brought the steel ring in front of him, but even his eyes were almost sunken and he couldn't find the weld, so he asked, "What welding process do you use?" ”

"Laser welding. Liu Chunman said indifferently.

"What?" Professor Zhao's tone changed......