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

Initially, he was only working in the laboratory preparing SG-1 materials when he was intrigued by the accidental waste generated by the experiment.

Compared with ordinary graphite materials, the feel of that kind of waste material is really special.

All of this was the result of his experiments, and in the end, in systematic research, he discovered that the reason why this waste was special was that it was willing to be separated from a porous mesh aerogel layer condensed on its surface.

To be honest, he was somewhat disappointed by the result. After all, the porous mesh aerogel prepared from graphene is not a novel research result, and it can even be said that similar materials have been applied in some electrode materials.

However, as the first research topic in his life to apply for a research topic independently, and the first project he applied for after coming to this institute, he was unwilling to give up so simply.

Therefore, after discovering that this porous network aerogel itself has no special value, he continued to study its behavior in other dispersion media, dispersed phases, and the properties exhibited by compounding with other materials.

The process is desperate.

Even so desperate that he doubted his life.

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

Using this porous network aerogel prepared from graphene as a toughening agent combined with silicon carbide ceramics, it has exerted an unexpected miraculous effect!

As a toughening agent in its own right, the properties of this porous web aerogel are not superior, at least compared to other similar materials.

However, his performance in thermal performance made him excited and couldn't help but shout in the laboratory.

I couldn't wait to write the results of the experiment into a report, and Hou Jinli handed it over to the institute.

After not too many twists and turns, the experiment report was placed on Lu Zhou's desk the day after he handed it in......

……

Although many interesting inventions are born by chance, this accident is also a little too unexpected.

Looking at the experimental report in his hand, a look of interest appeared on Lu Zhou's face.

"It's kind of interesting."

The report is divided into two parts.

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

Select graphene oxide as the basic raw material, prepare 1~2mg/ml graphene oxide solution, add reducing agent, stir for 5~10 minutes, make it reduce at 90?160 °C for 30-45 minutes, immediately take it out and put it in the freezer for 4 hours, take it out and continue to reduce it at high temperature for 5 hours after taking it out and thawing, and finally wash it several times and dry it...... This porous reticulated 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 the porous network aerogel prepared from graphene material to the SIC ceramic layer, and obtained a graphene-ceramic composite with a special structure.

From a microstructural point of view, the 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 obtained from the high temperature resistance test, this special graphene-ceramic composite material can withstand high temperatures of 3200 degrees in an oxygen-free environment!

In addition to its excellent high temperature resistance, the material has a small coefficient of thermal expansion and significant anisotropy in thermal conductivity.

That is, the heat energy is easily transferred in the direction of the cross-section, but not in the direction of the vertical section!

In addition, there are tensile and compressive strength, as well as resistance to thermal stress, etc.

Judging from these data, this material can be said to be quite good.

Looking at the interested look on Lu Zhou's face, Yang Xu opened his mouth and asked, "This is the kind of material you need?" ”

"It's hard to say," Lu Zhou leaned back in his office chair after putting down the experimental report in his hand, "but this report has provided me with an idea." ”

Yang Xu: "Ideas? ”

"That's right," Lu Zhou nodded, and after thinking for a moment, he continued, "At first, I subjectively thought that the ceramic material was not suitable for the first wall because its heat dissipation performance was too poor, but from another point of view, this kind of heat transfer performance perpendicular to the interface is better if it is 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 also have to consider adding a thermal insulation layer between carbon fiber composites and liquid lithium, otherwise the working temperature of more than 3,000 degrees will vaporize the liquid helium layer that we use to recover neutrons." ”

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

The thermal conductivity is too weak, and it's not good if it's too strong, and from this point of view, carbon fiber is a little too much.

In contrast, the anisotropy of this new material in terms of thermal properties is quite outstanding. Appropriate weakening of heat energy transfer in the direction of the vertical section allows sufficient buffer time for the external cooling unit.

As for the heat dissipation of the structural materials, it can also be done by "inserting into the structure. into the heat pipe, the heat transferred in the direction of the section is exported".

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

However, while the thermodynamic problem is largely solved, there is a more critical issue here......

"What about the ability to resist neutron irradiation? That's the most important thing. ”

Hearing this, Lu Zhou sighed: "You're right, this is the key to the problem." Although the material is suitable in all respects, it is resistant to neutron irradiation...... Whether it will work or not will have to be known by a try. ”

Whether it is silicon carbide or graphene, the nuclei of carbon and silicon are still very stable, and the covalent bonds of C-Si are also far more stable than metal bonds. At the same time, the permeability of the two materials to the neutron beam is also considerable.

However, in theory, it is.

However, in reality, the destruction of materials by neutron irradiation is not only the destruction of atomic transmutation and internal chemical bonds, but also the destruction of the purest physical structure.

The latter, relying on theoretical analysis, is basically useless, and conclusions can only be drawn in experiments.

It's just the trouble ......

You can't try this thing.

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

Neutron irradiation resistance testing is one of the most difficult things to do in materials science.

Ordinary anti-radiation experiments are fine, and neutrons can be released by bombarding the beryllium nucleus with α particles.

It can even be said that the most important reason why it is difficult to carry out research on the first wall material of the controllable fusion reactor is that there is no equipment that can test the material for radiation resistance.

Constantly bombarding samples with neutrons of 14 MeV, where can you find such experimental equipment?

Ordinary neutron sources simply can't reach this magnitude.

Even if you go to Daya Bay, the irradiation level of the nuclear fission nuclear power plant is two orders of magnitude different from the irradiation level of the fusion reaction!

As for accelerators......

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

As for indirect acceleration (deuterium nucleus method), there is, but in fact, to obtain the energy of neutrons, it is better to directly take α particles to shoot beryllium metal foil. The former's only advantage is that it is only slightly more stable in the direction in which the neutron beam is generated.

Thinking of this, Lu Zhou was also a little difficult, his index finger tapped lightly on the table, and he weighed it in his heart.

Let the STAR device "barely" one more time?

Theoretically, it's not impossible.

But if you have to strike for a month to do this experiment, will the cost be too great?

After all, this stellar simulator device is currently the only one in China.

The experts of the nuclear industry group are still working on how to imitate it, and if the only piece of equipment is broken, it will be a matter of getting away with it.

However, at this moment, Lu Zhou's mind suddenly flashed, and he reached out and patted his forehead.

MMP！

Just thinking about how to toss his stellar, why did he forget about the tokamak.

Although the pulse ignition is not constrained for a long time, it can also be ignited by special good!

Although there is only one stellar simulator in China, there are still many tokamaks......

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