Take Off My Aviation Era

　　 Hearing Professor Zhao's words, Tong Xia's eyes lit up. Looking at the black ball in the teacher's hand, it was as if she had seen some incredible treasure. But thinking of the teacher's body, Hope's eyes were a little more worried.

It seemed that he was aware of the entanglement of the students around him. Professor Zhao coughed a few times with excitement, then waved his hand to signal that he was okay, and then handed the ball in his hand to Tong Xia: "Look, this is what I told you before. I saw silicon nitride bearings when I visited European and American countries in the early 1980s. It should be correct. Take a good look. This thing is very useful..."

　　 At this moment, Professor Zhao is like a child who has picked up a novel object. He appears to be both excited and cheerful, and even with words, he becomes extremely brisk.

　　 quickly explained the situation of silicon nitride bearings.

　　 This also starts with the core technology of the helicopter.

　　Different from fixed airplanes, the core technology of helicopters is divided into several major parts, the most important of which are power system and transmission system.

　　The power system naturally refers to a high-performance turboshaft engine, and the transmission system is the part that connects the power system and the propeller.

　　 Many components are subdivided, but no matter which component is inseparable from the support and connection of the bearing, so that the transmission system can run better.

　　 Because of this, the bearing has become one of the most important mechanical parts of a helicopter, and it is completely indispensable.

　　 Therefore, the performance of the bearing has a great impact on the helicopter, and even in a sense it can completely affect the life and death of a helicopter.

　　 Then what would be used to judge the performance of a helicopter bearing?

　　 The aviation industry has long established a standard for this, that is, under the condition of no lubricating oil injection, the bearing of the helicopter can work normally for 30 minutes without damage when the turboshaft engine is running at high speed.

　　 Don’t underestimate this condition. Generally speaking, the bearing will not be damaged for 30 minutes. It is estimated that the rollers in it will be broken due to the high temperature generated by the strong friction within 5 minutes.

It should be known that the running speed of turboshaft engines is very high. Even with the reduction gear control, the transmission rate is amazing. This causes the helicopter transmission system to always be in high-speed operation, and the supporting bearings naturally have to withstand the high friction and high temperature caused by this. .

　　Because of this, the stable operation of the helicopter lubrication system is very important, because it can not only reduce the friction coefficient of the transmission system, increase the number of revolutions, but also use lubricating oil to cool the bearing **** and ensure the safety of the bearing.

　　 It's just as the saying goes that the moon is cloudy and clear, and people have good fortune. The lubrication system on the helicopter is inherently complicated. What if the lubricating oil is interrupted due to a breakdown?

　　 Do you want to watch the bearing **** in the helicopter shatter, and the helicopter transmission is stuck and fell directly?

　　Designers naturally don't want this to happen, so how to make the bearing can run smoothly for half an hour under the extreme conditions of poor or no oil, so that the helicopter can land safely has become the goal of designers and engineers.

Therefore, since the 1960s, high-temperature alloy steel has replaced ordinary low-carbon steel as the main material for high-performance bearing balls. The effect is naturally good. However, the problem is that metal materials such as nickel, chromium and cobalt have been added to high-temperature alloy steel. Coupled with the special requirements of metallurgy and heat treatment, the cost of this type of bearing remains high.

In addition to this type of high-temperature alloy steel, in addition to high temperature resistance, there is no significant improvement in friction coefficient, thermal expansion rate, and creep resistance compared with low-carbon steel. In addition, its own heavier mass makes helicopter design The teacher is not satisfied.

　　 Under this background, industrial ceramic materials that started in the 1950s and gradually matured in the 1960s and 1970s began to enter the vision of helicopter designers and engineers.

After some experiments and demonstrations, they found that a ceramic material called silicon oxide has diamond-like hardness, has the same strength as steel, and is as light as aluminum. The most important thing is that these properties are not available at high temperatures of more than 1,200 degrees Celsius. obvious change.

　　 Such a good thing is obviously the ball material that helicopter bearings dream of.

"In this regard, the Americans are still very powerful. They have been widely used in the late 1970s. By the mid-1980s, all newly produced US helicopters used this kind of silicon nitride ball bearings; the Europeans would lag far behind. , When I visited Europe, they just started the demonstration test. As for ourselves..."

Professor Zhao first sighed as he spoke, and then picked up the silicon nitride **** in his hand again, with a trance in his expression, but with some excitement, he turned his head and looked at Zhuang Jianye and others: "I thought we would have to Silicon nitride ball bearings could only be produced in the mid-to-late 1990s. I didn’t expect that your Ascendas Group has already made it. Why didn’t you publish such an important technical achievement? Is it because who deducted your manuscript? Tell me, if there is such a thing, the old man, I have to fight for this life to make you fair."

　　Professor Zhao was very calm at first, but as he spoke, a decisive and decisive aura came out undisguised, his face became even more terrifying, and he was obviously touching the real fire.

It’s no wonder that Professor Zhao’s reputation for Ascendas Group was very polarized when he was in Beijing~www.wuxiaspot.com, and now he even listened to it before seeing such a core achievement that is enough to make domestic helicopter technology a big step forward. I have never heard of it, and this makes the old man inevitably think about whether it is deliberately targeting the Tengfei Group.

Seeing Professor Zhao's appearance, Zhuang Jianye just wanted to explain, but before he could figure out how to use his words, he saw Liu Chun smiled and sat beside Professor Zhao, and almost made Zhuang Jianye's heart raise his voice. Eyes: "Looking at you are older than me, I will honor you as Brother Zhao. Tell you the truth. The Ascendas Aerospace Technology R&D Center, which is engaged in these silicon nitride balls, never thought of putting this thing Regarding the publication of technical results, for them, these are gadgets that are used to transform the results after the experiments have failed, and to make a little pocket money. They are not at all concerned, so it is normal for you not to see Brother Zhao."

　　 Zhuang Jianye can’t wait to rush over to press Liu Chun’s old man, and then sew that beeping mouth. If you dare to say this, you are not afraid to roll his eyes again?

　　 Not to mention anything else, I saw Professor Zhao's dull look like being struck by thunder at this moment, and I knew that the old man's trembling, careful liver was shocked again.

　　 The fact is indeed the case. Professor Zhao thinks this silicon nitride bearing is already very remarkable, but it is just a product of failure in the Ren Tengfei Group, and it is used as a gadget for pocket money.

Professor Zhao is almost 80, and for the first time he feels that his three views have collapsed, and he deeply doubts whether his life is in vain. Such cutting-edge things are the products of failures, gadgets, then he has done it for a lifetime. What is a helicopter? Les Miserables?