Scholar’s Advanced Technological System

If the number of failures is counted, Hou Jinli has counted how many times he has failed.

Initially, he only attracted interest in the accidental waste generated when preparing sg-1 materials in the laboratory.

Compared to ordinary graphite materials, the feel of the waste is quite special.

All of the above are the conclusions drawn from the experience he accumulated in the experiment, and finally in the systematic study, he discovered that the reason why this waste is special is that it is a layer of porous mesh with its surface. Aerogel barrier.

To be honest, this result somewhat disappoints him. After all, porous mesh aerogels made of graphene are not new research results. It can even be said that similar materials have been used in some electrode materials.

However, as the first research topic in the life of the independent application, it is also the first subject to apply after coming to the institute. He does not want to give up as simple as that.

Thus, when it was found that the porous network aerogel itself has no special value, he continued to perform its properties in other dispersion media, dispersed phase, and other properties. In-depth study.

This process is desperate.

Even desperate to make him doubt life.

Fortunately, for the last time, he did not give up.

The use of such a porous mesh aerogel prepared from graphene as a toughening agent combined with silicon carbide ceramics has exerted an unexpected miracle!

As a toughening agent itself, the performance of such a porous mesh aerogel is not superior, at least compared to other similar materials.

However, his performance in thermal performance was so excited that he could not help but shouted out in the laboratory.

Unable to write the results of the experiment into a report, Hou Jinli handed it over to the office.

Without too many twists and turns, this experimental report was placed on Lu Zhou’s desk the day after he turned in...

......

Although many interesting inventions were born by chance, this accident has come too unexpectedly.

Looking at the experimental report in his hand, Lu Zhou’s face showed an interesting look.

"interesting."

The report is divided into two parts.

The first part relates to the preparation of such porous mesh aerogels.

Select graphene oxide as the base material, prepare 1~2g/l graphene oxide solution, add reducing agent, then stir for 5-10 minutes, let it reduce at 90160 for 30-45 minutes, immediately take it out and put it into the freezer for freezing. After 4 hours, the thawing was carried out and the reduction was continued at a high temperature for 5 hours, and finally washed several times and dried to obtain such a porous network aerogel.

As for the second part, it is the key content of the whole experiment.

In the experiment, through the process of atomic layer deposition, Hou Jinli's research team chemically bonded the porous network aerogel prepared from graphene material to the si ceramic layer, and thus obtained a special structure of graphene. - Ceramic composites.

From a microscopic point of view, this material can be abstracted into a honeycomb-like graphene layer connected in the middle of the ceramic layer, and these honeycomb-like graphene molecules are tightly bonded together with the si molecules.

According to the experimental results obtained from the high temperature test, this special graphene-ceramic composite can withstand a high temperature of 3200 degrees in an oxygen-free environment!

Moreover, not only is its excellent high temperature resistance, the material has a small coefficient of thermal expansion and a remarkable anisotropy in thermal conductivity.

That is, the heat energy is easily transmitted in the cross-section direction, and is not easily transmitted in the vertical cross-section direction!

In addition to this, it includes tensile strength and compressive strength, as well as resistance to thermal stress and the like.

From the data point of view, this material can be said to be quite excellent.

Looking at the look of interest on Lu Zhou’s face, Yang Xu asked, “Is this the material you need?”

“It’s hard to say,” put down the experimental report in his hand, Lu Zhou leaned on the office chair. “But this report provided me with an idea.”

Yang Xu "Thoughts?"

“Yes,” Lu Zhou nodded. After thinking for a while, he continued. “At first, I thought that ceramic materials are not suitable for the first wall because of its poor heat dissipation performance, but from another perspective, This heat transfer performance perpendicular to the interface is a little smaller."

Yang Xu "Why do you say that?"

“Because of the liquid lithium neutron recovery system,” Lu Zhou smiled and continued. “With the thermal conductivity of carbon fiber composites, we have to consider adding a thermal insulation layer between the carbon fiber composite and liquid lithium. Otherwise, three thousand Above the working temperature, the liquid helium layer that we used to recover the neutrons was vaporized with carelessness."

The difference in operating temperature between the two materials can be said to be one of the core difficulties in the entire reactor project.

The thermal conductivity is too weak, too strong, too strong. From this point of view, the carbon fiber is a little too far behind.

In contrast, the anisotropy of this new material in thermal performance is quite outstanding. Properly weakening the transfer of thermal energy in the vertical cross-section provides sufficient buffer time for the external cooling unit.

As for the heat dissipation of the structural material, it can also be solved by a method of "inserting a heat transfer pipe into the structure and transferring heat transferred in the cross-sectional direction".

Although I don't know about the fusion project, Lu Zhou explained that it was quite popular. Yang Xu immediately understood what he meant.

However, although the thermodynamic problem has basically been solved, there is still a more critical issue here...

"Is it resistant to neutron radiation? This is the most critical."

Hearing this sentence, Lu Zhou sighed. "You are right. This is the key to the problem. Although this material is still suitable in all aspects, it is resistant to neutron irradiation. Just try it and you will know."

Whether it is silicon carbide or graphene, the nucleus of carbon and silicon is still very stable, and the -si covalent bond is far more stable than the metal bond. At the same time, the permeability of the two materials to the neutron beam is considerable.

However, this is theoretically the case.

But in reality, the damage of materials caused by neutron irradiation is not only the atomic transformation, but also the destruction of internal chemical bonds, as well as the most pure physical structural damage.

The latter, by theoretical analysis, is basically useless, and only when it is in the experiment can we draw conclusions.

Just the trouble is...

There is no way to try this stuff.

Yang Xu smiled a bit bitterly and euphemistically said, "This experiment is not very good."

Anti-neutron irradiation performance testing is one of the most difficult materials in materials science.

The general anti-irradiation experiments are still good, and the neutrons can be released by bombarding the nucleus with a particle.

It can even be said that the study of the first wall material of the controllable fusion reactor is difficult, and the most important reason is that there is no equipment that can resist the radiation test of the material.

With 14v neutrons constantly bombarding the sample, where to find such experimental equipment?

The general neutron source does not reach this magnitude at all.

Even if you go to Daya Bay, the irradiation grade of the nuclear fission nuclear power plant is also two orders of magnitude worse than the irradiation grade of the fusion reaction!

As for the accelerator...

It’s even more nonsense, and I haven’t heard of anyone who can accelerate neutrons directly. If anyone does, I am afraid that the entire theoretical physics community has to call his father.

As for the indirect acceleration, there is, but in fact, to obtain the energy of the neutron, it is better to take the a particle directly to shoot the metal foil. The only advantage of the former is that it is only slightly stable in the direction in which the neutron beam is generated.

Thinking of this, Lu Zhou also made some difficulties, the index finger tapped on the table, and the heart weighed.

Let the star device "stubborn" once?

In theory, it is not impossible.

But this one experiment will strike for a month, will the price be too big?

After all, this imitation star device is currently the same in China.

The experts of the Nuclear Industry Group are still studying how to imitate. If the only piece of equipment is tossed, then it can be played off.

However, at this moment, Lu Zhou’s brain suddenly flashed a flash of light and reached for the forehead.

p!

I thought about how to toss my own imitation star, how to forget Tokamak.

Pulse ignition, although the constraint time is not long, but the special good can also ignite!

Although there is only one domestic star-like device, the Tokamak device is still a lot...