Selling fishing rods in the live broadcast room caused a sensation in the military industry!

As Li Yang began to analyze the questions raised by Liu Kai, his voice was the only voice left in the laboratory.

A group of bigwigs, including Yang Wei and Li Jianye, listened carefully to Li Yang's explanation.

Liu Kai is even worse.

I don't know where I got a notebook and a pen, but I started taking notes on it.

After Li Yang wrote the formula on the blackboard, he pointed at it and analyzed it.

"Please look at this formula, where σr is the tensile strength of the carbon fiber, e is the Young's modulus, γa is the surface free energy of the fiber, and ac is the basal plane crack size."

"From the formula, it is not difficult to see that the larger the size of the defective structure crack, the lower the tensile strength of the carbon fiber."

“So…reducing the size and number of defects is the key to increasing tensile strength!”

Hearing this, everyone nodded slightly.

This speculation was involved in their previous research, and it was indeed as Li Yang said.

But the key is how to reduce the size and number of defects!

Li Jianye adjusted his reading glasses and asked with a frown.

"Engineer Li, in fact, most research institutes in the country have discovered this problem."

“However, how to solve this problem is the fundamental reason why we cannot make further progress in high-end carbon fiber.”

"So, how did you solve this problem?"

Liu Kai nodded without saying anything. Instead, he turned to the next page in his notebook, clenched his pen, and waited for Li Yang's further explanation.

Li Yang's explanations and experience sharing are completely different from the step-by-step theoretical knowledge in textbooks.

Every point he made was derived from thousands of experiments and tests.

Liu Kai understood this, so he was more focused and didn't want to miss any word Li Yang said.

At this time.

Zhao Hui came in from outside, walked to the front, then handed the encrypted tablet in his hand to Li Yang, turned around and stepped aside.

After Li Yang got the tablet computer, he retrieved several experimental pictures from it, and then used a projector to project the screen onto the snow-white walls of the laboratory.

"Please take a look at this graph, which shows the relationship between the fiber surface defect depth, internal pore diameter, and unit tensile strength, drawn from the data I obtained through a large number of experiments."

Two clear experimental data graphs were displayed in front of everyone. Li Jianye and others immediately turned their eyes over and observed carefully.

Li Yang continued.

"From these two figures, it is not difficult to see that the tensile strength of carbon fiber directly depends on the defect structure of the fiber, such as the pore diameter and defect size."

"Reducing the size of pores in the fiber or reducing defects on the fiber surface can effectively improve the tensile strength."

"In this way, we have narrowed down the goal of increasing the tensile strength of carbon fiber to reduce the size of fiber pores and defects."

Li Yang's step-by-step and guided explanation style gave Li Jianye and others a refreshing feeling and clear ideas.

It's not just them.

Even people like Fan Xiaohu who were not experts in this field nodded with a thoughtful look in their eyes.

On the other hand, Liu Kai listened with great interest, his hands moving non-stop. In just a few minutes, his notebook was filled with notes.

Seeing Li Yang stopped, he asked excitedly.

"Engineer Li, how can we reduce the fiber pores and surface defects? Can we change the polymer raw materials to make its pores more 'pure' from the beginning?"

Liu Kai's tentative question made Li Yang raise his eyebrows slightly, quite surprised.

As expected of a PhD who has studied abroad, just this kind of analysis can see through the phenomenon to the essence of the problem.

Li Yang nodded and praised.

"Engineer Liu is amazing, he hit the nail on the head!"

Hear the words.

Liu Kai's face lit up and he smiled happily, like a kindergarten kid who got a red flower reward.

Li Jianye, Yang Wei and others who were standing behind him also looked over, with a hint of admiration in their eyes.

Young people... their brains work quickly...

After a brief interlude, Li Yang returned to the topic and continued.

"As Mr. Liu said just now, we need to start 'purification' from the raw materials to reduce fiber pores and surface defects."

"I have discovered through a lot of experiments and data observations that the pores can be effectively reduced by improving the purity of the polymer and effectively preventing contamination by foreign elements such as metals."

"At the same time, it was observed that the tensile modulus of the fiber surface is higher than that of the internal area of ​​the fiber. This is because the fiber microcrystalline structure is parallel to the surface, and the oxidation of the pan precursor also proceeds from the surface during the oxidation process."

"And during the oxidation and carbonization process, the applied drawing tension tends to be concentrated in the fiber surface area, resulting in additional defects on the fiber surface. This also shows that controlling the defect structure is extremely important for improving the tensile strength of carbon fiber!"

"So in summary: by using the traditional pan solution spinning technology, finely controlling the carbonization process, improving the microstructure of carbon fiber at the nanoscale, and controlling the orientation, crystallite size, and defects of graphite in the carbonized fiber, the tensile strength of carbon fiber can be improved, and carbon fiber with higher grade and performance can be prepared!"

After Li Yang finished speaking, the laboratory fell into silence, with only the sound of pen tips rubbing against paper being heard.

The people present were still immersed in Li Yang's detailed explanation.

A long time passed.

As Li Jianye let out a long sigh, the almost stagnant atmosphere finally slowly dissipated.

Li Jianye praised generously.

"Mr. Li's explanation really opened my eyes. I now have a clearer understanding of some of the difficult and complicated problems in carbon fiber research before."

"Mr. Li, I'm grateful for your advice!"

He clasped his fists in thanks, his face sincere and full of admiration.

Li Yang's lecture just now was not to directly tell them the key method to break through the T-1200 carbon fiber. This is impossible and unrealistic.

If core technology can be disclosed so easily, how can people survive?

His analysis and explanation are more about clearing away some obstacles on the research road, cutting off some detours and pointing out a clear path.

It sounds simple and no big deal.

However, only those who have truly delved into the field of carbon fiber research and experienced losses and setbacks in it, will know how important Li Yang’s explanation just now is.

without any exaggeration.

If Li Yang's class were taught in other countries, it would at least reduce their research time on carbon fiber by five, ten or even more years.

This is a priceless special course!

Yang Wei asked at this time.

"Engineer Li, can you record your lecture so that the country's top professors and experts in the field of carbon fiber research can study it together?"

"Your class is of great significance!"

Long country's carbon fiber research is in trouble, but that doesn't mean there is no progress.

What they need is a guiding light.

Yang Wei thinks.

Li Yang's class is the best 'beacon'!

Li Yang was slightly startled when he heard his words.

Then he smiled and nodded in agreement.

"It is my honor! ..."