bonanza

Chapter 803 Original Plan
Except for Dongsheng Group, Dongsheng Mining, and Dongsheng Chemical, those who participated in the commissioning ceremony.

There are also leaders from relevant departments and Shanghai-listed companies, as well as several aircraft manufacturers including Chang'an, Rongcheng, and Shengjing.

First day of workshop.

Experts from Dongsheng Chemical made a report first. In addition to T300 grade carbon fiber, they also introduced the research progress of T700 grade carbon fiber.

Dongsheng Heavy Industry introduced their gantry-type five-axis automatic wire laying machine.

Carbon fiber alone is not enough, and the application of carbon fiber is also a problem.

The efficiency of automatic wire laying machine is much higher than that of manual wire laying, and it can also save a lot of materials and solve the overall manufacturing problems of complex curved surface components such as aircraft fuselage, tail cone and S-shaped air inlet.

Previously, this kind of equipment was monopolized by Spain, the United States, and France, and our country could not import it.

In the previous life, when our large civil aviation aircraft was developed, domestic carbon fiber already had a certain foundation.

In addition, it is a civilian airliner, and it is more convenient to import carbon fiber.

But after the carbon fiber was bought back, it was found that it could not be used, so I had to switch back to aluminum alloy.

When our airliner was finally launched, the proportion of composite materials in the fuselage was only a fraction of that of Boeing and Airbus in the same period.

After their reports, experts from domestic universities and research institutions began to "speak freely".

The saliva of the experts was flying everywhere, and everyone fell asleep listening to it.

Looking at those great experts and professors who talked so eloquently, Yang Dongsheng suddenly wanted to ask them, what qualifications do you have to talk here?

Why didn't you see your shadow when you were developing it?
Yang Dongsheng looked at Yang Miao, who was in high spirits, "If you don't like it, go out and have fun."

Yang Miao shook her head.

The second day is the official commissioning ceremony.

The leaders of all parties cut the ribbon together with the main management personnel of Dongsheng Group, Dongsheng Mining Northern Branch and Dongsheng Chemical, and then visited the production line.

One of the main production processes of carbon fiber is to heat the raw silk to 400 to 1900 degrees under the protection of inert gas to carbonize the raw silk.

However, before carbonization, pre-oxidation is required.

PAN, the raw material for carbon fiber production, is polyacrylonitrile, with a melting point of 317 degrees, a thermal decomposition temperature of only 230 degrees, and vitrification at 104 degrees.

If it is carbonized at 400 degrees from the beginning, the carbon fiber precursor will be broken, melted, or even decomposed.

The protofilament is dehydrogenated and oxidized by pre-oxidation, and a cyclization reaction occurs inside.

The zigzag linear chain structure of polyacrylonitrile gradually transforms into a stable trapezoidal six-membered ring structure that is not easy to melt, which can withstand higher temperatures before the raw silk enters the carbonization furnace.

At the final stage of pre-oxidation, when it reaches 300 degrees, the raw silk looks no different from carbon at this time, and then the raw silk is sent into the carbonization furnace.

After carbonization at 400 to 1900 degrees, after nitrogen, hydrogen, oxygen and other elements are further removed, the precursor at this time also loses almost half of its weight, and a carbon fiber precursor with a carbon content of about 95% is obtained.

At this time, the fiber strength is already very high, but it is not enough. Next, the carbon fiber precursor must be graphitized.

The melting point of graphite is as high as 3850 degrees. At this temperature, most substances will be vaporized.

However, carbon fiber is not pure graphite, and its melting point is not so high.

The carbon fiber precursor will be placed in a sealed device, and under the protection of inert gas, it will be further heated to 2500 to 3000 degrees, and the pressure will be continuously applied.

This step can not only further remove the contained impurities, but also obtain high-purity pure carbon.

It can also promote the transformation of crystalline carbon in the fiber to graphite crystal, reduce the angle between it and the fiber axis direction, and effectively improve the elastic modulus of the carbon fiber.

This is also one of the ways Toray uses high-strength carbon fibers to produce high-modulus carbon fibers.

Representatives of various manufacturers and research institutions stared wide-eyed from beginning to end, looking at the technical points of each step-the initial temperature of pre-oxidation, the speed of temperature increase, the time of pre-oxidation...

These are all core technologies.

At the end of the visit, everyone was very excited.

Seeing these people eager to try, Yang Dongsheng was also very happy.

As soon as he returned to the office, Director Li reported that in the past [-] minutes, five units had asked him if they could buy some carbon fiber precursors from Dongsheng Chemical alone?

There are also units that want to set up a joint venture with them to produce carbon fiber together.

Yang Dongsheng picked up the phone and called Zhao Vice President of Dongsheng Mining Northern Branch, "You can talk to them according to the original plan!"

After putting down the phone, Yang Dongsheng looked at Yang Miao, "Do you understand?"

"En!" Yang Miao nodded.

It was Yang Dongsheng's plan to sell raw silk on a large scale and cooperate in the production of carbon fiber. Otherwise, he would not have taken those people to go through the steps of pre-oxidation, carbonization, and graphitization in detail.

More raw silk production lines of Dongsheng Chemical are already under construction, and only the first phase of the project can produce 2000 tons of raw silk.

In carbon fiber production, the cost of raw silk accounts for more than half of the entire carbon fiber production cost, and it is also the most difficult step in carbon fiber production.

Yang Dongsheng didn't show those people at all just now.

From the very beginning, his plan was to follow the model of Dongsheng Heavy Industry.

They only produce part of carbon fiber, and then sell raw silk in large quantities, and gather a bunch of companies around them to do downstream industries that require high investment.

In this process, they can also sell pre-oxidation furnaces, carbonization furnaces, wire laying machines and other equipment.

Even if they don't do it in this market, Toray will definitely do it.

After the mass production of T300 carbon fiber in China in the previous life, Toray not only dumped T300 carbon fiber to China, but also dumped a large amount of raw silk to China.

A large number of carbon fiber production enterprises without raw silk production capacity have sprung up in the country.

After these companies spent huge sums of money to build production lines, they discovered that Toray made all the profits, and many of the carbon fibers they produced were not up to standard.

Instead of letting the Japanese do this market, it is better for them to do it themselves.

And once Toray dumps carbon fiber, they also need allies to share Toray's pressure.

After Director Li finished his report, he put down a book.

"What is this?" Yang Dongsheng was taken aback.

"This is a recently published novel about the struggle of steel bosses, which is very well received!" Director Li said,
"Really?" Yang Dongsheng picked up the book, flipped through a few pages, and enjoyed himself.

At the end of the 90s, are you still looking for Americans to buy rolling mills?It is also said to be the most advanced in the world.

Yang Dongsheng thought it was a trap at first, but finally found out that it was not.

When buying steel rolling equipment in the 90s, at least it should be written as German or Japanese.

And what does it mean to ask others to contract the next steel plant with an annual output of one million tons for 5000 million yuan?The "expert" behind the protagonist also made this a tricky situation.

Does the person who wrote the book know how profitable a steel plant with an annual output of one million tons was in the 90s?
(End of this chapter)