Chapter 328: All the comrades working on sensors will answer the questions
Before he recovered from the shock of the material selection of Type B thermocouple, he had already seen the performance indicators listed at the back.

This made him immediately throw away all the platinum, rhodium, ruby ​​and so on. What are those? Can they be eaten?
He recited all the parameters, his voice getting louder and his emotions getting more intense.

At the end, he slapped the table and said, "Good! Gao Zhendong did a great job!"

The measurement range has increased by 500 degrees, with high stability and high accuracy.
The accuracy of 2.5 thousandths is already very high. For example, leaving aside the instruments used for calibration by inspection agencies, the water meters and electricity meters responsible for collecting water charges in a few decades will probably be at this level.

His eyes were fixed on a line of words in the briefing.

“Suitable for use in strong radiation environments.”

He knew the meaning behind this very well. There was an urgent need for K-type armored thermocouples in the desert, not to mention the B-type.

As for whether there is something fishy here, what a joke. If it were someone else, he might want to verify it, but this thing was made by Gao Zhendong, so as long as it is written in black and white, it must be a done deal.

The leader touched the briefing with great care and couldn't help saying, "It seems that he really can't rest."

He called Secretary Sun and handed him the briefing: "Transfer it to the Defense Working Committee as quickly as possible!"

A few minutes later, the communicator led by the Defense Work Committee walked into his office and handed him a document.

"Leader, urgent matter from the 17th Ministry of Machinery."

The leader immediately took it over. It must be a big matter since it was an urgent matter for the 17th Ministry of Machine Building.

Looking at the lines of data and explanations on the paper, the leader's face was filled with joy, as if he had found a pillow when he was about to fall asleep. With the smooth progress of several things in the desert, the original measurement methods were no longer sufficient, and temperature measurement was one of them. Even if there was no bottleneck yet, it was time to prepare for a rainy day.

Not long ago, a comrade who came over on a business trip had raised this issue. Unexpectedly, Gao Zhendong solved it quietly, and even raised funds from the factory itself.

He rubbed his eyes and said something similar to the leader of the 17th Ministry of Machinery: "Comrade Zhendong will have to suffer a lot."

He asked the signalman to call the comrades in the confidential room and said, "Send this thing to the desert as soon as possible. Tell us how many you need as soon as possible."

This is truly the case of good news spreading far and wide, and thanks to the efforts of Comrade Gao Zhendong, this "thousand-mile" spread is much easier than before.

Deep in the desert, several scientists were looking at a new batch of computers and talking about them.

"This technology has really advanced. With just a little bit, it can do something similar to the DJS-59?"

"This is a good thing. If nothing else, the calculation speed of models and test data will be faster."

"Haha, this thing is so small. I'm afraid the gang that made the firecrackers are thinking of something else."

"I'm afraid they've done more than just thinking about it. They brought this batch here personally. They must have thought about where to install it and how to secure it eight hundred times."

"Then you better keep an eye on our batch and don't let them blow it up, hahahaha."

At this time, someone came over in a hurry: "Boss, there is an urgent matter from the Defense Work Committee."

One of them took the document, opened it and took a look, his face lit up: "The committee's support is so timely, I really don't know how they did it."

When the other people heard this, they knew it was good news and started asking questions.

The man handed them the document in his hand and said, "Take a look for yourself."

A few people passed it around, documents are passed around, smiles are contagious.

There was a smile on everyone's face.

The boss smiled at a few of them and said, "This time, you can continue with your experiment. You don't have to spend a lot of time designing experimental plans, doing indirect measurements or side evidence. You can just do it directly."

Several people smiled and nodded. "Yes, yes, it is suitable for high-radiation environments. The person who made this B-type thermocouple is really amazing. It's like it was tailor-made for us. We don't even have to worry about radiation hardening."

Even if there is an alternative solution using K-type thermocouple, it is not as good as using B-type directly. The more intermediate links there are, the greater the chance of trouble.

What's more, the meaning of alternative often means that the alternative is not the best and there are always defects and problems of one kind or another.

The boss laughed again and said, "But be careful when you use it. This thing looks like it's covered in money. Hahaha."

Several people nodded and said, "Yes, that's for sure. Let's hold a meeting to determine the installation size and quantity, and start the work as soon as possible. The comrades in the committee have come up with this so quickly, and we can't let them down."

If they knew that this thing had nothing to do with the request they made to the Defense Work Committee, and was purely a byproduct of technological innovation, and that the project was established much earlier than when they made the request, I don’t know how surprised they would be. —Wow, the comrades who work on sensors will answer the question quickly! ! ! !

A day later, the demand for type B thermocouples by comrades on the two lines in the desert was reported back to the 17th Ministry of Machine Building.

The leader of the 17th Machine Department was about to notify the Third Rolling Mill to organize production, but suddenly he seemed to remember something and stopped.

After thinking for a while, he said to Secretary Sun, "Notify the director and chief engineer of the Third Rolling Mill to come to the department for a meeting tomorrow. Just the two of them."

Secretary Sun wrote down the work arrangements and asked, "Leader, are there any other departments or personnel that need to be notified about this meeting?"

The leader shook his head and said, "No need. By the way, just notify the chief engineer of the department. No need to inform others."
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Yu Yuncheng moved quickly. After all, it was not difficult for him to pull out a single crystal of silicon dioxide.

At this time, he was in Gao Zhendong's office, while the latter was reading the inspection report of the finished silicon dioxide single crystal product.

Although it is just a simple inspection report, Yu Yuncheng did a solid job, with a lot of content including graphs, tables, data analysis, conclusions, etc.

Gao Zhendong read it carefully and put the materials on the table.

"Well, there is no problem with this thing. Here, this is the next work plan, which includes the material ratio and the preparation of polycrystalline mercury cadmium telluride compound polycrystalline. Take a look first. As for the transition from compound polycrystalline to single crystal, we will talk about it after the compound comes out. The same furnace is used for both steps. First, prepare a batch of compound polycrystals. When it comes to pulling single crystals, the furnace does not need to switch functions frequently. The crystal pulling time is really too long, and frequent switching will affect work too much."

As he spoke, Gao Zhendong pretended to take out a piece of material from the safe. As for the actual source of the material, it was obvious.

Yu Yuncheng took it happily and read it carefully.

Among the materials, the preparation of compounds is actually quite simple. If you only look at the process, as long as the equipment and materials are fine, it can probably be done by anyone with hands.

First, according to the required infrared band, combined with the formula given by Director Gao and the cavity volume of the quartz reaction tube, the amount of cadmium is calculated, and then the amount of mercury and tellurium is calculated based on the amount of cadmium.

Calculate the amount, weigh and put it into the tube, then burn and seal the quartz reaction tube, and the preparation is complete.

During synthesis, put the reaction tube into a special furnace and burn it!
The component materials melt at high temperature. The melting points of these three materials are much lower than that of the quartz tube, so the quartz tube will not be burned. As for why it is necessary to seal the quartz tube instead of directly burning the raw materials in the crucible, this involves the issue of mercury vapor pressure. In short, this is the simplest way.

After melting, the three materials will form mercury-cadmium-telluride compounds. At this time, an operation needs to be added to make the chemical combination process more effective.

It’s not a fancy operation, just keep shaking it. But it takes a long time, 1 to 2 days.

This is also one of the reasons why mercury cadmium telluride is difficult to deal with. For any step, the reaction or operation time has to be calculated in days. Gao Zhendong told Yu Yuncheng that an experiment would take several months or even half a year. That's how it came about.

When the shaking time is almost up, use high-pressure nitrogen to blow the quartz reaction tube at high speed, and then you have the mercury cadmium telluride polycrystals.

Is not it simple?
There are two complicated aspects of this process: the formula for determining the components based on the infrared band, and the furnace used for heating, which is why it is called a special furnace.

Even high-pressure nitrogen is not necessary. If the conditions are really bad, high-pressure air is also acceptable.

The formula is ready, Director Gao has already written it down. As for the furnace, Director Gao has also drawn a schematic diagram, a swinging furnace that can pass high-pressure gas.

As for the step from the schematic diagram to the actual furnace, this is what Yu Yuncheng has to do himself.

Don't underestimate these two simple steps. If Yu Yuncheng wants to produce a sufficient number of cadmium mercury telluride polycrystals, it will take at least one or two months. The furnace has to be modified. After the modification, one furnace of polycrystals will take at least two or three days. Ten crystals will take at least one and a half months.

After all, Gao Zhendong only needs to draw pictures and write materials, and this is what Comrade Lao Yu should consider.

Yu Yuncheng asked Gao Zhendong many questions about details that he didn't quite understand, and Gao Zhendong answered them one by one.

After a long time, Yu Yuncheng put away the materials with satisfaction, gathered his troops, and returned to his base camp No. 1761 to shake the pipe.

After seeing him off, Gao Zhendong quickly finished his plan for integrated circuit technology.

In fact, a lot of work in this plan is not just for the current integrated circuit, which is a general technology. Take the previous matter as an example. Ion implantation doping and metal wire deposition are all prepared for the mercury cadmium telluride linear array thermal imaging sensor.

After all, mercury cadmium telluride is also a semiconductor, and its processing also requires the addition of semiconductor technology.

After spending half an afternoon finalizing the plan, Gao Zhendong sent it to Factory 1274 and asked them to take a look at it first. After both parties reached an agreement, they could jointly submit the plan.

This is just like confessing a love. Confession itself is just a formality. What really plays a decisive role are the processes that precede it.

(End of this chapter)