Hearing Professor Zhao's words, Tong Xia's eyes lit up. She looked at the black ball in the teacher's hand as if she had seen some extraordinary treasure. But thinking about the teacher's body, her hopeful eyes became more worried.
As if aware of the entanglement of the students around him, Professor Zhao coughed a few times excitedly, then waved his hand to indicate that he was fine, 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. They should be right. Take a good look at them. These things are of great use"
At this moment, Professor Zhao was like a child who had picked up a novel object. He seemed excited and happy, and his words became extremely brisk.
The situation of silicon nitride bearings was quickly explained clearly.
This also starts with the core technology of the helicopter.
Unlike fixed aircraft, the core technology of helicopters is divided into several major parts, the most important of which are the power system and transmission system.
The power system naturally refers to the high-performance turboshaft engine, while the transmission system is the part that connects the power system and the propeller.
It is subdivided into many components, but no matter which component it is, it is inseparable from the support and connection of the bearing so that the transmission system can operate better.
Because of this, bearings have become one of the most important mechanical components of helicopters and are completely indispensable.
Therefore, the performance of bearings has a great impact on helicopters, and in a sense, it can completely affect the life or death of a helicopter.
So what is used to judge the performance of a helicopter bearing?
The aviation industry has long had a definition standard for this, that is, without lubricating oil injection, helicopter bearings can operate normally for 30 minutes without damage when the turboshaft engine is running at high speed.
Don¡¯t underestimate this condition. For ordinary bearings, let alone 30 minutes without damage, the rollers inside will probably break due to the high temperature generated by strong friction in 5 minutes.
You must know that the running speed of the turboshaft engine is very high. Even if it is controlled by a reduction gear, the transmission speed is astonishing. This causes the helicopter transmission system to be always running at high speed, and the supporting bearings naturally have to withstand the friction and high temperature caused by this. .
Because of this, the stable operation of the helicopter lubrication system is very critical, because it can not only reduce the friction coefficient of the transmission system and increase the number of revolutions, but also use lubricating oil to cool down the bearing balls and ensure bearing safety.
But as the saying goes, the moon waxes and wanes, and people have their fortunes and misfortunes. The lubrication system on the helicopter is complicated. What if something breaks down and the lubricating oil is interrupted?
Do you want to watch the bearing balls in the helicopter shatter and the helicopter's transmission become stuck and fall down?
Designers naturally don¡¯t want this to happen, so how to make the bearings run smoothly for half an hour under extreme conditions with poor lubricating oil or even no oil, so that the helicopter can land safely has become the goal that designers and engineers strive for.
Therefore, since the 1960s, high-temperature alloy steel has replaced the original ordinary low-carbon steel as the main material of high-performance bearing balls. The effect is naturally good, but the problem is that nickel, chromium, cobalt and other metal materials are added to high-temperature alloy steel. Coupled with the special requirements in metallurgy and heat treatment, the cost of such bearings remains high.
In addition, in addition to high temperature resistance, this type of high-temperature alloy steel has no obvious improvement over low-carbon steel in terms of friction coefficient, thermal expansion rate, and creep resistance. Coupled with its heavier mass, helicopter design The teacher was not satisfied.
Against this background, industrial ceramic materials, which started in the 1950s and gradually matured in the 1960s and 1970s, began to enter the field of vision of helicopter designers and engineers.
After some experiments and demonstrations, they found that a ceramic material called silicon oxide is as hard as diamond, as strong as steel, and 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 coveted ball material for helicopter bearings.
"In this regard, the Americans are still great. They have been widely used in the late 1970s. By the mid-1980s, all newly produced American helicopters used this kind of silicon nitride ball bearings; Europeans are far behind. , when I went to Europe to visit, they had just started demonstration experiments. As for ourselves"
Professor Zhao sighed first as he spoke, and then picked up the silicon nitride balls in his hand. He looked a little dazed, but also excitedly turned his head to look at Zhuang Jianye and others: "I thought we would have to do it ourselves." Silicon nitride ball bearings were only developed in the mid-to-late 1990s. I didn't expect you?Tengfei Group has already achieved it, so why haven¡¯t you published such an important technical achievement? Has your manuscript been withheld by someone? Tell me directly, if this really happens, I will risk my life to seek justice for you, old man. "
Professor Zhao was very calm at first, but as he spoke, a murderous and decisive momentum came out without concealment, and his face became even more terrifying, obviously he was really angry.
No wonder Professor Zhao is like this. When he was in Beijing, his reputation for Ascendas Group was very polarized. Now that he has seen such a core achievement that can make domestic helicopter technology a big step forward, he had never even heard of it. This made the old man wonder whether there was something deliberately targeting Ascendas Group.
Seeing Professor Zhao's appearance, Zhuang Jianye was about to open his mouth to explain, but before he could think of how to word it, Liu Chun sat down next to Professor Zhao with a smile. His words almost made Zhuang Jianye's heart rise to his throat. Yan'er: "Seeing that you are older than me, I will respectfully call you Brother Zhao. To tell the truth, Brother Zhao, the Tengfei Aviation Technology R&D Center that made these silicon nitride balls has never thought of using this thing." When it is published publicly as a technological achievement, to them it is just a gadget that they use to convert the results after failed experiments and earn some pocket money. They don't take it to heart at all, so it's normal for you, Brother Zhao, not to see it."
Zhuang Jianye wished he could rush over and press Liu Chun down, then sew up that blind beeping mouth. If he dared to say this, wouldn¡¯t he be afraid of making Professor Zhao roll his eyes again?
Without saying anything else, seeing Professor Zhao's dull expression as if struck by lightning at this moment, you knew that the old man's trembling little heart had been shocked again.
¡°This is indeed the case. Professor Zhao thinks that this silicon nitride bearing is already great, but here at Rentengfei Group it is just a failed product, a gadget used in exchange for pocket money.
Professor Zhao is almost 80 years old. For the first time, he feels that his outlook on life has collapsed. He deeply doubts whether his life has been in vain. Such cutting-edge things are all products of failure. Gadgets, then he has been working on them all his life. What's a helicopter? Les Miserables?
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