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Chapter 554 Waste Utilization

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    It¡¯s not just Professor Zhao who feels this way, Tong Xia and Wu Ping also feel the same way.

    Anyone who works on helicopters will not care about bearing performance. Anyone who cares about bearing performance will know the excellence of silicon nitride bearings.

    You must know that in the domestic helicopter field, apart from the long-term heart disease that cannot be cured, the biggest difficulty is high-end bearings.

    This is why we need to introduce relevant technologies from abroad, just to improve our own level in one step. From the effect point of view, some technologies have indeed achieved results, but those high-end core technologies still cannot break through.

    There is no other reason, just because those high-end core technologies cannot be produced by getting some samples and doing physical and chemical analysis. Instead, they require the accumulation of multiple basic disciplines and slow exploration to gradually form their own.  thing.

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

    For example, take the turboshaft engine on a helicopter. The turboshaft 8 used in the introduction of the "Dolphin" helicopter can be gradually localized according to the technical specifications of the French, but that is localization. If you want a more powerful turboshaft engine, the turboshaft  In fact, there are not many conveniences that 8 manufacturers can borrow from turboshaft 8, and they still have to go back and start over.

    Because the aviation engine is a test of basic skills and accumulation, and there is no room for opportunism. Only by going through all the processes step by step can we say that we have completed the first step of the Long March.

    The same goes for the balls in high-end bearings. Although they are inconspicuous, the polished stone of any stone is not inferior to those balls in terms of appearance, but it involves extremely high-end materials science and manufacturing technology.

    Take silicon nitride bearings as an example. Everyone knows that this thing is good. However, except for the United States, which has applied it to helicopters on a large scale, Europe and the Soviet Union are also considered to have advanced aviation technology, but they have not been applied on a large scale. Why?  It¡¯s not because this thing is difficult to make and cannot be applied on a large scale.

    But for such a high-end thing, Ascendas Group actually calls it the product of a failed experiment, just a small thing for pocket money. Oh my God, what kind of weirdo is this Ascendas Group!

    Fortunately, Tong Xia and Wu Ping just thought about these words in their hearts. If Zhuang Jianye and Liu Chun heard these words, they would definitely point their fingers at the sky and the earth, swearing that they really were not lying.

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

    As for the experiment, it is high-end. The insulation material on the outside of a certain long-range missile dissipates the warhead.

    You must know that Tengfei Aviation Technology R&D Center has only done one thing for so many years, and that is to use carbon fiber materials, and carbon fiber reinforced composite materials derived from them are a major branch of it.

    ??It is divided into two major categories, one is carbon fiber reinforced metal matrix composite materials that have been widely used in the aerospace field, and the other is carbon fiber reinforced ceramic matrix composite materials.

    The former can be used as the main material of aeroengines or long-range missile bodies, while the latter is an essential technology for improving key components such as aeroengine combustion chambers and turbine blades, and for loading warheads into long-range missiles.

    As we all know, the only way to improve the performance of an aeroengine is to increase the temperature in front of the turbine and increase the thermal efficiency. However, ordinary metal materials simply cannot persist for a long time at a high temperature of more than a thousand degrees. Even if various means are used to increase the cooling efficiency, in the end  There is a limit.

    So engineers thought, could they coat the heated parts of an aeroengine 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 ceramic materials have good stiffness and strength. More importantly, ceramic materials have very good heat resistance, generally between 1800 and 2000 degrees Celsius. Coupled with the increase in the past  The technical means of reducing the temperature in front of the turbine, combined with the ceramic coating, will greatly improve the performance of the aeroengine.

    The same goes for the loaded warhead of a long-range missile. Due to the friction with the air in the atmosphere when falling at high speed, a large amount of heat energy will be generated. If no protection is provided, the warhead will be directly burned by the atmosphere like a meteor before it hits the target.

    In the past, alloy steel was used with thermal barrier coatings to resist the high temperatures of re-entry into the atmosphere.

    But this will virtually increase the weight of the warhead, reduce the weapon load, and reduce the attack efficiency. Therefore, major powers in the world have carried out research on lightweight heat-resistant materials in order to apply them to loaded warheads, thereby increasing the weapon load.

    As an important material provider in the aerospace sector, the Ascendas Aviation Technology R&D Center, like other materials research institutions in the aerospace sector, undertakes research in this field.

    And soon based on its own advantages, it came up with carbon fiber reinforcedtype ceramic matrix composite materials program, and in the past year or so, it has developed four carbon fiber reinforced ceramic matrix composite materials: zirconium oxide, zirconium boride, silicon carbide, and silicon nitride.

    After technical verification by the aerospace department, zirconium boride and silicon carbide-based carbon fiber-reinforced ceramic matrix composite materials have become emerging long-range missile load-type warhead materials, and other zirconium oxide and silicon nitride have been brought back.

    If it were other research and development units, the failed products they returned would probably be thrown into the old paper pile and become the so-called "technical reserve".

    However, the Ascendas Aviation Technology R&D Center is not an ordinary technology R&D unit after all. The benefits brought by the transformation of many years of technological achievements have long been ingrained. What happened to the failed products that were rejected by the aerospace department? Can't they be used as waste?

    If the thermal barrier materials used in aerospace are not used, why can¡¯t our own aerospace engines be used?  So after more than half a year of intensive research, it was discovered that zirconia can be used as a coating material for engine combustion chambers and turbine blades to improve the thermal efficiency in front of the turbine of aeroengines. The company received strong support from the group, with funding and bonuses raining down on it.

    In contrast, silicon nitride is not so lucky. Due to its properties, the silicon nitride coating is easy to fall off during high-speed operation and cannot be used as the core material of aeroengines. Naturally, the attention has to be lowered to a higher level. Naturally, it cannot be used.  to the group¡¯s full support.

    But the Ascendas Aviation Technology R&D Center was not willing to waste it like this. After all, it had been the result of such a long time, and it would be a big loss if we didn't make some money. So based on the properties of silicon nitride, the Ascendas Aviation Technology R&D Center changed it to  The main materials for machine tool cutting tools and bearings are sold to various branches according to the group's internal pricing commission model.

    Liu Chun came here this time because people from other branches said that the batch of machining tools and bearings made by Tengfei Aviation Technology R&D Center were not bad. He came to see if their aviation power plant could use them.

    But I didn¡¯t expect that because of the good performance of the machining tool, I didn¡¯t get it myself. I only got two bearings to take back and test them to see where they could be used.

    ¡°As a result, I never expected that even the low-end products that Ascendas Aviation Technology R&D Center earns pocket money from would make the old Beihang professor in front of me react so much. Could it be that Ascendas Aviation Technology R&D Center has made something amazing again?

    "Brother Zhao, don't get excited. Whether this thing will work or not will have to be tested for progress. If it doesn't work, aren't you happy in vain?" Seeing Professor Zhao doubting his life, Liu Chun was also startled and quickly spoke.  He comforted: "What's more, this bearing is made of two pieces of low carbon steel welded, and is not as solid as a cast one."

    "Welding?" After hearing this, Professor Zhao finally came to his senses and put the steel ring in front of his eyes, but he couldn't find the weld even though his eyes almost sunk in, so he asked: "What welding process do you use?"  .¡±

    "Laser welding." Liu Chun said nonchalantly.

    "What?" Professor Zhao's tone changed

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