Chapter 57： heartfelt convince

Facing the questioning eyes of the four professors, Li Yizhan smiled and introduced: "3D printing materials can be divided into several categories, namely: metal materials, magnetic materials, biological materials, composite materials, polymer materials, ceramic powders, ... "

"According to the difference of 3D printing technology, different materials are used: fused deposition printing technology, mainly using ABS and materials; photocuring printing technology, mainly using photosensitive resin materials; 3D powder bonding technology: using powder materials such as ceramics Powder, metal powder, plastic powder; …, there are many types of 3D printing technologies, as well as laser sintering, layered manufacturing, digital light processing, fused filament manufacturing, electron beam melting molding, …, the material selection is very wide.”

Hearing this, the four professors nodded their heads and expressed their approval for Li Yi's technical explanation.

Li Yi's remarks are enough to show that he has a clear understanding of the field of 3D printing materials.

It is not easy for Li Yi to have such a profound understanding of the field of materials research at a young age. However, this knowledge is merely indicative and cannot explain anything.

"Mr. Li, you have a wide range of knowledge in the field of 3D materials! I don't know which type of materials are you more optimistic about? What are the requirements for the materials developed by this cooperation?" Professor Liu Cheng glanced at Li Yi unexpectedly, Then ask.

"Well, among so many types of materials, I think metal materials have the most potential. At present, the resolution of the main metal 3D printing process is usually 20~50μm. This limitation makes it difficult for 3D printing technology to realize the manufacture of fine and complex metal components. , if a metal material with a resolution lower than 50nm can be developed, combined with the corresponding printing technology, 3D printing can completely replace the vast majority of today's industrial manufacturing." Li Yi smiled and judged confidently.

Before deciding to invest in this field, Li Yi spent a period of time to prepare and learn about the field of 3D printing, and even carefully selected several black technology materials suitable for 3D printing in the library.

How to use the black technology in the library safely and effectively, after obtaining the library, Li Yi has been thinking about it all the time.

If he only relies on his ability, even with a lifetime of energy, he will not be able to apply the infinite black technology in the library to reality.

Therefore, Li Yi feels that he is more suitable to be a leader of scientific research, create a suitable scientific research environment, provide some important scientific and technological data, correct research direction, and lead scientific research experts and scientists to participate in the research together.

This cooperative development of printing materials is just the beginning. Using the existing scientific research laboratories and scientific research talents of Jinyuan Technology, provide funds and provide the correct scientific research direction. Relevant material formulas were developed.

The scientific research direction described by Li Yi is very tempting. If this new material can be realized, it will indeed bring revolutionary changes to the field of 3D printing manufacturing.

The four professors looked at each other and hesitated.

"Mr. Li, your judgment on the prospects of this technology is correct, but you are too optimistic about the 'R&D progress'. This technology may not be realized within 20 years." Professor Nie Xiaofeng figured out something, looked at Li Yi, He smiled wryly.

"Yeah! Due to the reduction in particle size, the changes in macroscopic physical properties, coupled with the nano-scale manufacturing process, ... this technology is very difficult to achieve." Professor Pan Fusheng nodded in agreement.

"Professors, I think you are too pessimistic." Li Yi smiled slightly, and his words changed, and continued to introduce: "If, using the exchange reaction of methoxyethoxy nickel and acrylic acid ligands, to prepare a compound rich in The organic precursor of metal nickel is then mixed with acrylic resin and photoinitiator to form a metal nickel-rich photoresist; two-photon lithography is used to form a three-dimensional polymer structure; the organic matter in the polymer is obtained by pyrolysis. Three-dimensional nano-metal structure with nickel mass fraction greater than 90%,  …”

"..."

After a pause, Li Yi finally introduced, saying: "The polymer sample is heated to 1000°C in an argon atmosphere, the organic matter is fully cracked, and at the same time, the metal particles are fused together and the integrity of the metal structure is maintained, ... this direction 3D printing of nano-metal materials should be realized at the nano-scale."

"Uh! How do you overcome the instability during plastic deformation?" Seeing Li Yi's words, Professor Liu Chengshi's eyes lit up, and he couldn't help asking more in-depth technical questions.

Li Yi smiled slightly and answered: "With the further reduction of the size of metal particles, in the process of plastic deformation, pure nickel grains with a size of about 15nm grow significantly at a temperature of 1173K (~0.68Tm), which is much higher than that of coarse grains. The recrystallization temperature of nickel. This phenomenon is related to the fact that the full dislocation cannot bow out at this size, and the grain boundary accommodates the deformation by releasing the incomplete dislocation. The release of the incomplete dislocation changes the structure of the grain boundary, making it transition to a low-energy state , using multi-layer fusion technology, can solve this problem, . . . "

The eyes of the four professors lit up, all of them were suddenly attracted by the research direction explained by Li Yi, and they all began to think seriously.

"A 3D nanometal structure? Its TEM characterization (a) How thick is the substrate?"

"Well, what is the mechanical strength of the successfully prepared nickel metal sample?"

"This technical solution is very feasible! Well, can this process be implemented in tungsten, titanium, these high melting point metals?"

"..."

After a while, the four professors discovered the bright spot of this technology and asked Li Yi to ask questions one after another.

Li Yi smiled slightly and answered their questions selectively.

Just kidding! Nothing was signed in the cooperation agreement. How could they be told to disclose some key experimental data?

Soon, a scene that left Xu Xiuyong stunned appeared.

The four professors asked questions one after another. When they asked a question, Li Yi answered a question easily and calmly.

Half an hour later, while the four professors were thinking, Xu Xiuyong hurriedly interrupted.

"It's too surprising, Mr. Li, you really hide it!" Xu Xiuyong looked at Li Yi with admiration and said with admiration.

After Xu Xiuyong's interruption, the four professors suddenly came to their senses. Li Yi's ability was so insane that they both forgot each other's age. They have been discussing technical issues with Li Yi with the attitude of dialogue with scholars of the same class. Woolen cloth!

Do not!

It should be said that Li Yi's scientific research knowledge in 3D printing metal materials far exceeds them, and it is they who ask each other for advice.

What a monster!

How old is Li Yi!

The four professors looked at each other and looked at Li Yi with a complicated look.

"Haha, it made President Xu laugh!" Hearing Xu Xiuyong's praise, Li Yi smiled modestly, looked at the four professors, and asked, "Professors, do you have any suggestions for this project?"

The four professors were silent, they were immersed in inexplicable emotions.

"What? Is there a problem with this project?" Xu Xiuyong asked with concern as he looked at the four professors.

"No! Mr. Li's research project is very implementable. I am very optimistic about this cooperation," Professor Pan Fusheng shook his head and said.

"Yes, Mr. Xu, Mr. Li's research depth on 3D metal materials, we are ashamed, I am also very optimistic about this project, it would be better if we can cooperate in research." Professor Wang Qian followed up.

"Well! It can be confirmed that this research and development direction has great potential."

"Yes, the success rate of research and development is not low!"

Professor Liu and Professor Nie nodded in unison. They were also very optimistic about this project and agreed in unison.

Hearing this, Xu Xiuyong couldn't help but breathe a sigh of relief. The four professors are the company's technical experts. If they are collectively optimistic about this project, then there will be no technical problems in this cooperation.

"That's great! Mr. Li, let's go to the meeting and decide on a specific cooperation plan?" Xu Xiuyong looked at Li Yi and asked excitedly.

Li Yi nodded and followed Xu Xiuyong out of the laboratory to the conference room.