Scholar’s Advanced Technological System

If you calculate the number of failures, you can't count how many failures you've made.

Initially, he was only interested in the preparation of SG-1 materials in the laboratory by accidental waste generated by the experiment.

Compared to graphite materials in general, that kind of scrap feels really special.

These are conclusions drawn from his experience in the experiment, and finally, in a systematic study, he discovered that the particular reason for this waste was a porous mesh aerogel compartment that he was willing to agglomerate with its surface.

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

However, the subject of the study, which was the subject of the first independent application in his life, was also the first to apply after coming to the Institute, and he did not want to give up so simply.

Therefore, in the absence of any particular value in the porous mesh aerogel itself, he continued his in-depth study of its manifestations in other dispersed media, dispersed phases, and properties exhibited by compositing with other materials.

The process is desperate.

Even despair made him doubt life.

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

Combine this porous mesh aerogel made from graphene as a toughening agent with silicon carbide ceramics for an unexpected odd effect!

As a toughener itself, this porous mesh aerogel is not superior in performance, at least compared to other similar materials.

However, his performance in thermal performance was so exciting that he couldn't reside in the lab and shout it out.

I couldn't wait to write the results of the experiment into a report, and I moved on to hand it over to the Institute.

Without too many ripples, this experimental report was placed on the Ark's desk the day after his submission...

……

Although many interesting inventions were coincidentally born, it was a little surprising that the coincidence came.

Looking at this experimental report in hand, the face of the ark shows a divine colour of interest.

“Kind of funny. ”

The report is divided into two parts.

The first part relates to the preparation of this porous mesh aerogel.

Select graphene oxide as the base material, formulate 1-2mgml of graphene oxide solution, add the reducing agent, then stir for 5-10 minutes, so that it is reduced at 90 ‑ 160°C for 30-45 minutes, immediately removed and frozen in a freezer for 4 hours, then removed and thawed for 5 hours, finally washed several times and dried... this porous mesh aerogel can be obtained.

As for the second part, it was a key part of the whole experiment.

In the experiment, through the process of deposition of the atomic layer, the Hopper's research team chemically bonded this porous mesh aerogel made of graphene material to the SIC ceramic layer, thereby obtaining a structurally specific graphene-ceramic composite.

Micro-structurally, this material can be abstracted into an intermediately connected cellular graphene layer of the ceramic layer, which is tightly bonded between these cellular graphene molecules and the SiC molecule.

Based on experimental results from high temperature resistance tests, this special graphene-ceramic composite can withstand high temperatures of 3200 degrees in an oxygen-free environment!

Moreover, it is not only its excellent high temperature resistance, the coefficient of thermal expansion of this material is small and has significant anisotropic properties in thermal conductivity.

That is, thermal energy is easily transferred in the cross-sectional direction, not in the vertical cross-sectional direction!

In addition, it includes tensile strength and compressive strength, resistance to thermal stress, and so on.

From these data, this material is quite remarkable.

Looking at the interested divine colour on the face of the ark, Yang Xu asked, "Is this the kind of material you need? ”

“Hard to say," put down the experimental report in hand, the ark leaned against the office chair, "but the report did provide me with a way of thinking. ”

Yang Xu: “Thoughts? ”

“Yes,” the ark nodded, reflecting for a moment, continuing, "I initially subjectively thought that ceramic material was not suitable for the first wall because of its poor heat dissipation performance, but from another angle, this perpendicular to the interface heat transfer performance would be better if it were smaller. ”

Yang Xu: “Why do you say that? ”

“Because of the liquid lithium neutron recovery system," the ark laughed and continued, "with the thermal conductivity of the carbon fiber composite, we also had to consider adding an insulation layer between the carbon fiber composite and the liquid lithium, otherwise the liquid lithium layer, which we used to recover the neutrons, would be vaporized at a temperature of more than 3,000 degrees. ”

The difference between the two materials in working temperature is arguably one of the core difficulties throughout the reactor project.

The thermal conductivity is too weak, too strong and not good. From this point of view, the carbon fiber seems a little too much.

In contrast, the anisotropy of this new material in its thermal properties is quite remarkable. Proper attenuation of the transfer of thermal energy in the vertical cross-sectional direction allows sufficient buffer time for external cooling units.

As for the heat dissipation of the structural material, it can also be inserted "inside the structure. The introduction of a thermal conduit will solve the problem by deriving the heat transferred along the cross-sectional direction”.

Although not familiar with fusion engineering, Ark explained it quite commonly, and Yang Xu immediately understood what he meant.

However, while the thermodynamics problem has largely been solved, there is a more critical problem…

“What about anti-neutron irradiation? That's what matters. ”

Hearing this, the Ark sighed: "You're right, that's the key to the problem. Although this material is suitable in all respects, the anti-neutron irradiation capability… it is necessary to give it a try. ”

Whether silicon carbide or graphene, where the atomic nuclei of carbon and silicon elements are still stable, C-Si covalent bonds are also much more stable than metal bonds. At the same time, the permeability of both materials for the neutron beam is considerable.

In theory, however, it is.

But in practice, neutron irradiation does not only destroy the material, it also destroys the internal chemical bonds, but also the purest physical structural damage.

The latter, on the other hand, is basically useless to rely on theoretical analysis, which can only be concluded if it is obtained in an experiment.

The trouble is…

There's no way to try this.

Yang Xu smiled somewhat bitterly and euphemistically said: “I'm afraid this experiment is not very good. ”

Anti-neutron irradiation performance testing is one of the hardest things to do in materialology, none of it.

Normal anti-irradiation experiments are okay, with alpha particles bombarding the beryllium nucleus releasing neutrons.

Even it can be said that the most important reason why the study of the first wall material of a controllable fusion reactor is difficult is that no equipment can be found to test the material against irradiation.

Using 14MeV neutrons to continuously bombard samples, where can I find such laboratory equipment?

Normal neutron source, never reached this magnitude.

Even to the Gulf of Daya, the radiation level of the fissile nuclear power plant is exactly two orders of magnitude different from the radiation level of the fusion reaction!

As for the accelerator...

That's even more ridiculous. I haven't heard of anyone who can speed up neutrons directly. If anyone really does, they're afraid the whole theoretical physics community will have to call him Daddy.

As for indirect acceleration (deuterium nucleus), but actually obtaining the energy of neutrons, it is better to shoot beryllium metal foil directly with alpha particles. The former's only advantage is that it is only slightly more stable in the direction in which the neutron beam is produced.

Thinking about it, the ark also made some mistakes, and the index finger tapped gently on the table, weighing in the heart.

Let the STAR device “barely” do it again?

Theoretically, no.

But wouldn't it be a little too expensive to do an experiment for a month?

After all, this is the same device in the country.

Experts from the nuclear industry are also studying how to replicate it, and if this only piece of equipment is torn apart, then it's off.

At this point, however, the ark's mind suddenly flashed with a glimmer of light, reaching out and clapping his forehead.

MMP!

Just thinking about how to toss your own star imitation device, how can you forget about Tokamak?

Pulse ignition is not for long, but it can be ignited at least!

Although there is only one copycat in the country, there are still many Tokamak devices...