Rekindle 2003

Chapter 1012: Innate Scientific Research Holy Body? !
Academician Que Duanlin was also dumbfounded. "No, what is so expensive?! Imported?"

He took a closer look and found that the huge reduction workshop actually only had two reduction furnaces and a lot of open space, which was obviously prepared for future expansion.

Zhang Huiguo pointed at the two reduction furnaces and sighed, "The reduction furnace plays a key role in the production of high-purity polysilicon, and its internal environment is extremely harsh.

During operation, the surface temperature of the silicon rod can reach as high as 1100°C, and it radiates heat in all directions, causing the furnace body to heat up. At the same time, the gases in the furnace, such as trichlorosilane and hydrogen chloride, are highly corrosive, placing strict requirements on the furnace wall material.

At present, domestic technology cannot reach the level of foreign countries. If we use domestic products, they will not pass the environmental impact assessment because they will cause too much pollution and be too wasteful.

This stove can only be imported. I have inquired about it and the cost is only a few million. Hanscat wants to sell it to us for 3800 million.

Moreover, this material is very fragile and basically needs to be replaced every three years. A large proportion of the unit cost of polysilicon now comes from the depreciation of this thing.”

Que Duanlin understood that Zhang Huiguo, who had always insisted on independence, had no solution to this problem. This was a problem of basic materials.

Not to mention quartz glass, even ordinary glass is more expensive the thicker it is.

The thicker it is, the more materials and more complicated processes are required during the production process, which leads to higher production costs.

家里阳台封窗用的5mm、10mm、15mm超白钢化玻璃，10mm厚的玻璃，是5mm厚玻璃的一倍，而15mm的价格则是5mm的4倍。

The thickness of the quartz glass of the heat insulation cover of the reduction furnace in front of us has reached an astonishing 90mm, which is a technology that is currently completely unavailable in China.

There is no way to attack the stronghold.

Some things require breakthroughs at the application level, while some things require breakthroughs at the theoretical level.

90mm thick quartz glass, at this time domestic manufacturers could only shake their heads, as it was unheard of.

Emperor Yun on the other side rolled his eyes when he heard this.

90mm thick is certainly unheard of.

Because it doesn't exist at all!

In fact, it is three pieces of 3mm thick quartz glass bonded together by special techniques.

This technique is called craftsmanship.

It's just that this fact sounds a bit insulting.

Just like in the 80s, when Sakura came to us to buy 3 tons of peanuts, and we had to wait for the glue-free fiberboard to be shipped, Sakura used machines to shell the peanuts right in front of us, and then produced fiberboard on the spot for us to take back.

Those who lag behind in technology deserve to be beaten, to be wronged, and to be insulted. This is what countless ancestors have told future generations with their swollen faces.

Stop talking about a big country and small people. Without a big country, you can't even be a citizen.

But at this time, Qingyun was too lazy to expose Hans the Cat's lies.

Because he wanted to replace the quartz glass from the root.

Qing Yun was listening on the side, and asked curiously, "Since it's so expensive, why don't you change the material?"

He asked directly and simply, trying his best to make his eyes as clear as a college student who was full of foolish curiosity about the world.

This question was indeed a bit low, but since the chairman was asking it, Zhang Huiguo didn't seem impatient.

Since Qingyun is Chen Yiquan's new disciple, it means that no matter what, he has to be somewhat related to scientific research. Even if it is just a title to gild the reputation, he has to understand it.

What's more, this is a great opportunity to demonstrate professional knowledge and deepen the chairman's understanding of the project.

He cleared his throat and began to explain in detail: "Mr. Xiaoqing, you may not know that the heat shield material parameters in the polysilicon reduction furnace are very high, mainly because they need to maintain stability and performance in high temperature and corrosive environments."

He pointed to the technical parameter table and continued, “You see, we require the density of the material to be between 0.95g and 1.35g per cubic centimeter, mainly to ensure its stability at high temperatures.

The ash content must be controlled below 500ppm to prevent impurities from reacting at high temperatures.

The thermal conductivity should be controlled at 5-30 W/m to ensure effective heat transfer. As for the compressive strength, it needs to reach 50-200 MPa to withstand the pressure that may be generated in the furnace. "

Zhang Huiguo paused, then emphasized: "But the most important thing is the three major indicators of material dimensional stability, corrosion resistance and high temperature resistance.

Dimensional stability is directly related to the coefficient of thermal expansion, which is particularly important in high-temperature operations. Any slight error may lead to equipment damage or production accidents."

These are actually the key data for improving the Siemens method.

Zhang Huiguo knew that his future colleagues had plenty of theoretical knowledge but no practical experience. After all, his was the only factory in Eban that was capable of actual production using the modified Siemens method.

So he explained very patiently and comprehensively, and in order to ensure Qingyun could understand, he tried to make it as easy to understand as possible.

Qing Yun was also patiently reviewing the basic knowledge, and at the same time, she suppressed the urge to correct the flaws in Zhang Huiguo's words, and listened carefully to every word Zhang Huiguo said.

His eyes revealed respect for his predecessors. Although as a reborn person, he knew the future direction of science and technology development and the limitations and room for improvement of many existing technologies, he also understood that without the hard work and practical accumulation of older generation researchers like Zhang Huiguo, there would be no "future" as he knew it.

The road of scientific research has never been smooth, and every bit of progress is the result of standing on the shoulders of predecessors.

Just like Einstein's theory of relativity, if it did not have Newton's classical mechanics as a foundation, it might still be just a philosopher's fantasy.

Every small step in scientific research is the result of the unremitting efforts of countless scientific researchers. Their work may seem insignificant at the time, but it paves the way for those who come after them.

Otherwise, if Einstein were thrown back to the Stone Age, he would simply starve to death because there would be no use for him.

As a reborn person, he actually wanted to tell this former leader in the polysilicon field how bright the future would be.

After Zhang Huiguo finished his explanation, he pondered for a moment, pretended to have thought about it, and continued to ask questions.

"Mr. Zhang, since the material is required to be resistant to high temperatures, reduce intergranular corrosion and reduce costs, why not use low-carbon stainless steel, which is much cheaper, as a substitute?
Quartz glass may also undergo crystallization at ultra-high temperatures, affecting its performance.”

Zhang Huiguo and others felt a little strange when they heard this.

They suddenly realized that the young chairman in front of them was the top scorer in this year's epic national college entrance examination, and it was said that he had scored full marks in mathematics, physics and chemistry.

Although the question raised by Qing Yun was still a bit low, they felt that this way of transforming thinking was much better than that of many undergraduate students in the same major.

This is an essential quality for scientific researchers.

After Qing Yun raised the question about material substitution, Zhang Huiguo explained in detail the differences in physical properties between the currently used quartz glass and low-carbon stainless steel.

He pointed out that although low-carbon stainless steel has advantages in some aspects, it still lacks durability and stability at high temperatures compared to quartz glass.

Zhang Huiguo explained, "Chairman, you are right. From the perspective of material properties, low-carbon stainless steel can indeed replace quartz glass. However, there is a problem with low-carbon stainless steel. It cannot be used for a long time, and how can its thermal stability be guaranteed?

The most important point is that the maximum heat-resistant temperature of quartz glass is 1500°C and the safe heat-resistant temperature is 1200°C, which meets the requirement of more than 1050°C required for polysilicon production.

Low-carbon stainless steel, such as 304L stainless steel, generally has a temperature range of -196°C to 800°C. The mechanical strength of 310S stainless steel decreases when the temperature exceeds 800°C. Although the heat-resistant temperature of 317L stainless steel can reach 1500°C, its creep strength causes its expansion coefficient to fail to meet the standard.

Qingyun listened carefully to Zhang Huiguo's explanation. He nodded to show his understanding, but then raised a new question.

"Mr. Zhang, you have been emphasizing the upper limit of heat resistance temperature. Can I draw the following conclusion: the higher the temperature of the reduction furnace, the faster the chemical reaction rate may be, and the higher the output?

If the conclusion is correct, my question is, why is it a constant 1100℃ instead of 1150℃?
My thought is, if the temperature is variable and the efficiency of the product changes accordingly, then why don’t we look for a new type of material to replace it?”

This question made Zhang Huiguo a little stunned. This chairman...

Such a monster?!
The eyes of the big guys were also full of surprise.

This is……

Grasp the concepts - generate questions - derive arguments - generate experiments to verify ideas?

At this time, Zhang Huiguo frowned, pondered for a moment, and then answered frankly, "Mr. Xiaoqing, we have indeed not conducted in-depth experimental research on this issue before, nor have we done any verification experiments.

We have always controlled the furnace temperature according to traditional operating standards, and the reduction furnace temperature is controlled at 1100 degrees.

As for why it is this temperature, it is because when I was investigating at Hans Cat's house, I secretly saw others controlling it in this way.

Regarding your question... I think the heat resistance safety limit of quartz glass is 1200°, and Hanscat is controlled at 1100°, so it is very likely that the conclusion is not that the higher the temperature, the better, so it is very likely that quartz glass is sufficient. "

When people heard this, no one blamed Zhang Huiguo for being too imprecise.

Because this is the norm in the primary stage in China.

There is nothing to be embarrassed about, as many domestic industries operate this way.

When carrying out the restoration project, there are many things that we know but not why.

To put it nicely, it's called crossing the river by feeling the stones.

The main purpose is to first solve the problem of "whether it can be manufactured".

You have to have it first. As for how it came about, no matter what, just fill the gap first.

The next step is to make modifications to solve the problem you are trying to improve, just like replacing parts when troubleshooting a computer. By constantly replacing parts, you will naturally understand why it is this problem.

Therefore, the big guys had no objection to what Zhang Huiguo said.

What they were more interested in was the young entrepreneur in front of them who kept asking questions.

Innate Scientific Research Holy Body? !
……

(End of this chapter)