Scholar’s Advanced Technological System

If you count the number of failures, Hou Jinli can't count how many times he has failed.

Initially, he was only interested in the experimentally generated waste materials when he was preparing SG-1 materials in the laboratory.

Compared to ordinary graphite materials, the waste feels a bit special.

All of the above are the conclusions drawn from his accumulated experience in experiments. Finally, in a systematic study, he discovered that the reason why this waste is special is that it is willing to condense a layer of porous network on its surface. Aerogel compartment.

To be honest, the result somewhat disappointed him. After all, porous mesh aerogels made from graphene are not new research results, and it can even be said that similar materials have been used in some electrode materials.

However, as the first independent research topic in his life, he was also the first one to apply after coming to this institute, and he did not want to simply give up.

So when he found that this porous reticulated aerogel was of no particular value, he continued to perform its properties in other dispersion media, dispersed phases, and the properties exhibited by compounding with other materials. In-depth research.

This process is desperate.

He even despaired to make him doubt life.

Fortunately, he did not give up the last time.

Using this porous aerogel made of graphene as a toughening agent to combine with silicon carbide ceramics, it has shown unexpected results!

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

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

Can't wait to write the experimental results into a report, Hou Jinli delivered it to the institute.

Without going through many twists and turns, the experimental report was placed on Lu Zhou's desk the day after he turned it in ...

...

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

Looking at the experiment report in his hand, Lu Zhou's expression of interest appeared on his face.

"interesting."

The report is divided into two parts.

The first part is about the preparation of this porous network aerogel.

Select graphene oxide as the basic raw material, prepare 1 ~ 2 / ml of graphene oxide solution, add reducing agent, and stir for 5 ~ 10 minutes, let it reduce at 90 ~ 160 ℃ for 30-45 minutes, immediately take out and freeze Freeze in the box for 4 hours, take out the thawing and continue the reduction at high temperature for 5 hours. Finally, wash it several times with water and dry ... This porous aerogel can be obtained.

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 this porous network aerogel made of graphene material to the SIC ceramic layer, and thus obtained a graphene with a special structure. -Ceramic composite materials.

From a microstructure perspective, this material can be abstracted into a honeycomb graphene layer connected in the middle of the ceramic layer, and these honeycomb graphene molecules are tightly bonded to the SiC molecules.

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

And, not only its excellent high temperature resistance, this material has a small thermal expansion coefficient, and it has significant anisotropy in thermal conductivity.

That is, thermal energy is easily transmitted in a cross-sectional direction, but not in a vertical cross-sectional direction!

In addition, including tensile strength and compressive strength, as well as resistance to thermal stress and so on.

From these data, this material can be said to be quite outstanding.

Looking at the interested look on the landing boat, Yang Xu asked, "This is the kind of material you need?"

"It's hard to say." After putting down the experimental report in his hand, Lu Zhou leaned on the office chair. "But this report provided me with an idea."

Yang Xu: "Thinking?"

"Yes," Lu Zhou nodded, thinking for a moment, then continued, "At first I thought subjectively that ceramic materials were not suitable for the first wall because its heat dissipation performance was too poor, but from another perspective, This kind of heat transfer performance perpendicular to the interface is better. "

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 composites and liquid lithium. Above the operating temperature, the liquid helium layer we used to recover neutrons was slightly gasified. "

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, and too strong is not good. From this point of view, carbon fiber is a little too much.

In contrast, the anisotropy of this new material's thermal properties is quite outstanding. Properly weakening the transfer of thermal energy in the direction of the vertical section can leave sufficient buffer time for the external cooling device.

As for the heat dissipation of the structural material, it can also be solved by "inserting and inserting a heat pipe into the inside of the structure to discharge the heat transferred in the cross-section direction".

Although he didn't know much about the fusion project, Lu Zhou's explanation was quite popular, and Yang Xu immediately understood what he meant.

However, although the thermodynamic problem is basically solved, there is a more critical problem here ...

"What about resistance to neutron radiation? This is the most important thing."

After hearing this sentence, Lu Zhou sighed: "You are right, this is the key to the problem. Although this material is considered appropriate in all aspects, the ability to resist neutron radiation ... You have to give it a try before you know. "

Whether it is silicon carbide or graphene, the nucleus of carbon and silicon is still very stable, and the C-Si covalent bond is also 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 the theory.

However, in reality, the damage to materials by neutron irradiation is not only the transmutation of atoms, the destruction of internal chemical bonds, but also the purest physical structural damage.

The latter is basically useless by theoretical analysis, and conclusions can only be drawn through experiments.

Just the trouble is ...

There is no way to try this stuff.

Yang Xu smiled bitterly and said euphemistically, "I'm afraid this experiment is not easy to do."

Testing for resistance to neutron radiation is one of the most difficult to do in materials science.

Ordinary anti-irradiation experiments are fine, and bombardment of beryllium nuclei with alpha particles can release neutrons.

It can even be said that the research on the material of the first wall of the controllable fusion reactor is difficult to carry out ~ www.readwn.com ~ The most important reason is that it cannot find a device that can perform the radiation resistance test on the material.

With neutrons constantly bombarding samples, where can I find them on such experimental equipment?

The average neutron source cannot reach this level at all.

Even if you go to Daya Bay, the radiation level of the nuclear fission nuclear power plant is still two orders of magnitude worse than the radiation level of the fusion reaction!

As for the accelerator ...

It's even more nonsense. I haven't heard of anyone who can directly accelerate neutrons. If anyone does, I'm afraid the entire theoretical physics community will have to call him dad.

As for indirect acceleration (deuteron method), there are, but in fact, to obtain the energy of neutrons, it is better to directly take alpha particles to shoot beryllium 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 had some troubles. He tapped his index finger gently on the table and weighed it in his heart.

Make the STAR installation "barely" again?

Not in theory.

But it will take a month to do an experiment. Will the price be too great?

After all, this star-like device is the only one in China.

Nuclear Industry Group experts are still studying how to imitate it. If this only piece of equipment is tossed and broken, then it will be off.

But at this moment, Lu Zhou suddenly flashed in his head, and reached out and patted his forehead.

MMP!

Just thinking about how to toss his own stellar, how to forget Tokamak.

Although the pulse ignition is not restrained for a long time, it can be ignited anyhow!

Although there is only one imitator in China, there are still many Tokamak devices ...

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