Scholar’s Advanced Technological System

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

Initially he was only interested in the waste generated by the experiment when he prepared the sg-1 material 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 porous mesh with its surface condensed. 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 the expression of interest.

“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 ~ 2mg / ml graphene oxide solution, add reducing agent, then stir 5 ~ 10 minutes, let it reduce 90-160 minutes at 30? 45 °C, immediately take it out and put it into the frozen The porous mesh aerogel can be obtained by freezing 4 in the box for one hour, taking it out after thawing and continuing to reduce 5 hours at a high temperature, and finally washing it several times and drying it.

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 bonded this porous network aerogel chemistry prepared from graphene material to the sic ceramic layer, and thus obtained a special structure of graphite. Alkene-ceramic composite.

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 to the sic molecules.

According to the experimental results of the high temperature test, this special graphene-ceramic composite can withstand the high temperature of 3200 in an anaerobic 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 expression of interest on Lu Zhou’s face, Yang Xu asked: “Is this the material you need?”

“Not good said,” put down the experimental report in his hand, Lu Zhou leaned on the office chair. “But this report gives me a way of thinking.”

Yang Xu: “Thoughts?”

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

Yang Xu: “Why do you say that?”

“Because liquid lithium neutron recovery system,” Lu Zhou laughed, 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 degrees or more. The working temperature, a little careless, vaporized the liquid lithium layer we used to recycle the neutrons.”

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 not weak, too strong or too good. 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 “inserting the heat transfer tube into the structure and discharging the 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, but the ability to resist neutron irradiation … can not be specific I only know when I try.”

Whether it is silicon carbide or graphene, the nucleus of carbon and silicon is still very stable, and the c-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 metamorphosis, but also the destruction of the internal chemistry bond, as well as the most pure physics 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 things to do in Material Science.

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

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.

Using 14mev’s neutrons to bombard the sample, where is the 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 him father.

As for the indirect acceleration (the nucleus method), there is actually, but in fact, to obtain the energy of the neutron, it is better to take the alpha particles 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 suddenly flashed his head and reached for his forehead.

Mmp!

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, there are still many tokamak devices…