Technology: breaking the hegemony that monopolizes the world

Zhang Tianhao was once just an ordinary undergraduate student who graduated from Harbin Institute of Technology. Because he wanted to find a job with less work and close to home, he chose Jiuzhou Technology. He even created a lot of funny products when he first started working.

Now, with Gu Qing's training and his own efforts, he has been able to provide "guidance" to former academicians of the Xia Academy of Sciences.

Li Lun, the chief engineer of the rocket project, was like a student beside him, listening patiently to the explanation and asking questions humbly. Although some of the engineers beside him still looked a little unconvinced, as Zhang Tianhao's explanation of the technology deepened, Those who were unconvinced finally lowered their arrogant heads.

"How should we use graphene technology in terms of materials? Because our current design unit has added graphene materials, but we still cannot meet the requirements."

Faced with this problem, Zhang Tianhao subconsciously raised his head and glanced at Gu Qing.

After seeing the other party's nod of approval, he continued: "First of all, you have to understand what kind of graphene we are talking about now. The graphene we first defined is composed of carbon atoms. It has the characteristics of graphite. It also has the characteristics of olefins.

But looking deeper, graphene is actually a two-dimensional carbon nanomaterial composed of carbon atoms with sp2; hybrid orbitals forming a hexagonal honeycomb lattice. Because its properties can meet the different requirements of ultra-thin, ultra-light and ultra-strong, it He is known as the 'King of New Materials'.

You may have heard of the widely circulated concept. If a perfect graphene film could be made into a cling film, this graphene cling film could be covered on a cup, and an elephant could sit on it until the cling film breaks. It's enough to see how strong it is.

Twenty-one years ago, two scientists in Britain peeled off graphite sheets from highly oriented pyrolytic graphite, then stuck both sides of the sheets on a special tape, peeled off the tape, and split the graphite sheets into two.

Then this operation was continued to make the graphite sheets thinner and thinner, and finally a sheet composed of only one layer of carbon atoms was obtained. This was the first academic artificial graphene.

But when we draw with a pencil, the pencil scratches on the paper, and the traces left behind may be several layers of graphene.

Inspired by this graphene technology, our Titanstar department has made transparent conductive films. In addition to developing ultra-fast integrated circuits, the semiconductor department also develops graphene because the electrons in graphene run very fast. The electron mobility at room temperature exceeds 10 times that of silicon materials. It is also an excellent high-strength and lightweight material. Therefore, on the space station There are many applications on it. "

After finishing talking about the most superficial things, Zhang Tianhao subconsciously turned his head and looked at Gu Qing again.

He knew that the following contents were all confidential technologies within the department. In addition to the technical staff, there were also some other staff of the rocket company. It seemed that it was not suitable to talk about deeper technologies here.

Gu Qing casually glanced at Luo Jiazhao, the head of his rocket company, smiled and shook his head and said: "Those who can enter the core area are project participants. Although Director Luo is in charge of business docking, he is actually also a top student in rocket engineering. You Let’s talk about it next.”

After receiving permission, Zhang Tianhao's expression became a little more relaxed.

He continued: “The graphene materials of our Titanium Division have been successfully used in aerospace thermal protection materials and thermal management to improve the limits of thermal stability and mechanical integrity under various gas or heat flow conditions.

If the aerospace industry wants to develop into space stations that allow long-term operation in outer space and other equipment for lunar landing projects, it has put forward higher standards for the heat resistance and ablation performance of these composite matrices.

For example, this material is a water-soluble phenolic resin nanocomposite made by using hot pressing method. When the graphite oxide content is within the range of 0.1% to 4.0%, it is evenly dispersed in the matrix and has good interfacial compatibility with the resin matrix. When the addition amount of graphite oxide is 0.5%, the thermal weight loss of the composite material is significantly improved as the temperature increases, and the carbon residue rate at 800°C is 9% higher than that of pure resin.

Graphite oxide was prepared by liquid phase oxidation method, and graphene oxide and phenolic resin nanocomposites were prepared by Steglich acetation reaction.

We can prepare graphene oxide from graphite at three different temperatures and mix it into phenolic resin through an ultrasonic bath, with a loading of approximately 0.1% to 2%.

This graphene oxide particle is well dispersed in the resin and can produce moderate char yield and thermal stability even under low load, so it is also used as an essential fuel-related substance on the JZ-404 rocket. "

"Currently, only experiments can be conducted to manufacture this substance at home and abroad. In our special manufacturing factory of Titanstar, this substance has completed mass production technology breakthroughs, and through in-depth research, we found that this kind of well-dispersed oxidation Graphene and phenolic plastic composite materials also play a great role in improving their mechanical properties and heat resistance. Moreover, they can also synthesize a special graphene material on a special platform, which is currently named JZ34323 by us. substance.

It is significantly better than original graphene and graphene oxide derivatives in improving the mechanical properties, electrical properties and thermal properties of materials. When the content of this substance is added to 1%, the decomposition temperature and residue at 800°C are optimized to 99°C and 2.1% respectively.

At the same time, substance No. JZ34323 was added to our rayon-based carbon fabric. Our laboratory also prepared a second ablation-resistant nanocomposite material with similar performance that cannot be found in the industry. This material was released in our 4 hours ago. There are many applications in rapid drop experiments.

There is also a graphene nanomaterial No. JZ952777, which is a high-temperature resistant refractory material combined with graphene oxide. It may be due to the vaporization of oxidized functional groups between graphene oxide layers and the formation of finely dispersed amorphous carbon. It is used This substance can reduce ablation rate and mass loss by 76% and 50% respectively.

In addition, there is a special graphene oxide-filled composite material that also has extremely excellent performance in withstanding high temperatures and resisting rays.

In our first phase of experiments, even at small concentrations, the fiber-matrix using this graphene material can be combined with the fiber at extreme ablation temperatures, thereby easily improving the performance of the fiber. "

These engineers of Kyushu Rocket Company certainly know how powerful the graphene super copper motor technology and graphene solid-state battery technology installed on the mecha by the Titanium Division of the parent company are.

But an hour ago, I only knew it was powerful but didn't know exactly how powerful it was.

And now...