A big country of aerospace with black technology

"Dean Zhang, wake up! Wake up!"

Zhang Xingyang fell into a drowsy sleep, vaguely heard someone calling him, and struggled to open his eyes.

What came into view was Zhang Xingyang's pretty anxious face. At this time, the corresponding information popped up in Zhang Xingyang's brain.

Su Xiao, who is in charge of guarding the laboratory, came to him in such a hurry, is there something wrong with the preparation experiment?

"Did something go wrong with the experiment? Or did the stove blow up?" Zhang Xingyang sat up from the simple camp bed in the office and asked.

Feeling that Zhang Xingyang seemed to have a bad understanding of his words, Su Xiao shook his head at this moment, and said embarrassingly:

"No, no, it's time, what should I do next."

At this time, Zhang Xingyang felt relieved, as long as there was no problem with the material preparation, he glanced at the watch on his wrist.

Wake yourself up half an hour before what you told me, the time is just right.

"Wait for me to wash my face, and then we'll go to the lab together."

Zhang Xingyang walked to the storage shelf at the door, picked up the towel on it, soaked it with the warm water left in the water bottle yesterday, and wiped his face vigorously.

Feeling that his brain was much clearer, Zhang Xingyang wrung out the towel and hung it on the rack.

Turning around and Su Xiao said: "Let's go, we will test the properties of materials that have not been graphitized later."

Graphitization is an important way to improve the performance of carbon-carbon composite materials, especially the strength and modulus of carbon-carbon composite materials can be significantly improved, and the strength of the material will continue to strengthen under high temperature conditions.

When he came to the material laboratory, Zhang Xingyang first checked the operating status of the furnace, and he was slightly relieved when he found that the furnace was still running stably.

Adjusted the mixing ratio of the mixed gas generator and slightly lowered the reaction temperature of the CVI furnace.

Zhang Xingyang glanced at Su Xiao, who looked at him adoringly, and couldn't help muttering in his heart.

"Is there something wrong with this girl's brain?"

"Ahem." Zhang Xingyang coughed lightly a few times, reminding Su Xiao to focus more.

"There is still about half an hour before the end of the densification process. You should prepare the thermal/mechanical simulation experiment machine first."

The thermal/mechanical simulation testing machine is mainly used to test the mechanical properties of materials under high temperature conditions.

Zhang Xingyang, who had originally explained a sentence and continued to observe the CVI furnace, waited for a while before realizing that Su Xiao was still standing there, so he asked suspiciously:

"What are you waiting for?"

Su Xiao said with a little embarrassment: "I just came to the research institute for an internship this month, and I am not very familiar with these instruments."

Hearing such an explanation, Zhang Xingyang felt speechless for a moment. He knew that she had just arrived at the research institute, but he didn't expect that even such basic work would be difficult to complete.

"I remember when you were in school, wasn't the direction the direction of the composite material? How come you can't even do this?!"

Su Xiao's face blushed in an instant, and he said nonchalantly:

"I was working with Professor Chen Zhe at the time, and he mainly worked on ceramic materials. At that time, we had relatively little research on the properties of materials in high-temperature environments."

Well, Zhang Xingyang didn't expect that Su Xiao would study ceramic materials at room temperature. This was his negligence.

"Okay then, let's take a look at the furnace, and I'll do the preheating of the test bench."

Zhang Xingyang said something, walked to the front of the thermal/mechanical simulation experiment machine, turned on its heating power, and checked that the instrument was operating normally.

He turned off the heating function casually, and after a while the prepared carbon-carbon composite material was placed in the heating furnace before it could be officially powered on for heating.

This machine mainly tests the strength and modulus of materials under high temperature environment.

At this time, the material densification treatment is basically coming to an end, and the vapor phase precipitation process is basically over at this time.

Zhang Xingyang turned off the machine, waited for the CVI furnace to cool down slowly, and chatted with Su Xiao who was watching the furnace temperature display value intently:

"How does life in the research institute feel, are you still used to it?"

Su Xiao came back to his senses, smiled and said:

"Everything is fine. Except that there are fewer people and more things going on now, there is no special feeling."

Because many senior researchers in the research institute have left, the research institute is now short of manpower to do things, basically women are used as men, and men are used as livestock.

"The research institute is currently in a difficult period, and there are insufficient manpower in all aspects. But after this busy period, we will go to various universities to recruit people, and then it will be much better."

Su Xiao nodded, smiled and said:

"It's good to be busy, and I can get in touch with a lot of jobs that I haven't touched before."

Looking at the rapidly dropping temperature, Zhang Xingyang first stopped the vacuum pump, and then said:

"Being able to get in touch with so much content about engines just after graduation is really good for your future development."

"Senior, what level do you estimate the high-temperature mechanical properties of this carbon-carbon composite material can reach?"

Su Xiao looked at the materials that were about to be made, and couldn't help asking curiously.

According to the material performance data in his own memory, combined with the current preparation conditions, Zhang Xingyang gave a data that seemed conservative to him, but exaggerated to others.

"Under the environment of 3200 degrees, the tensile strength is not less than 400MPa, and the interlaminar shear strength is not less than 20MPa."

"Of course, this is just my speculation. In fact, it is not certain whether such data can be achieved."

Su Xiao didn't know much about the performance of carbon-based composite materials to be considered advanced, so he didn't have much reaction to what Zhang Xingyang said.

If it were a researcher with some knowledge in this area, his first reaction would be that Zhang Xingyang would falsify the experimental data when he heard such data.

Because at this time, the latest carbon-carbon composite material developed by Yingjiang's family can reach a tensile strength of up to 200MPa in an environment of 3200 degrees.

Zhang Xingyang put on high-temperature heat-insulating gloves and took out the carbon-carbon composite material that had just been completed from the furnace. The surface of the material was still emitting bursts of heat.

Put one of the materials into the thermal/mechanical simulation experiment machine, and put the other materials into the cooling platform.

Turn on the power-on heating button, the first temperature tested is not high, only 500 degrees.

The speed of electric heating was very fast, and the target temperature was reached in less than two minutes. Zhang Xingyang began to operate and test the tensile strength.

The result came out quickly, and the electronic screen on the side showed that the tensile strength of the material had reached 325 MPa, which was more in line with Zhang Xingyang's speculation.

The tensile strength of carbon-carbon composite materials will increase with the increase of temperature, and the current temperature has not reached its strengthening limit.

According to Zhang Xingyang's speculation, the limit temperature will probably be around 3500 degrees.

The next test temperatures are 800 degrees, 1200 degrees, and 1600 degrees. Test every 400 degrees until 4000 degrees.

It took half a day to test the strength of the material at various temperatures.

The result is similar to what Zhang Xingyang speculated before. At 3200 degrees, the tensile strength is 412MPa.

At 3600 degrees, the tensile strength of the material decreased for the first time, from 412MPa to 398MPa.

At 4000 degrees, the strength of the material drops even more, down to 351MPa.

"The strength of this material decreases too quickly under ultra-high temperature." Su Xiao complained while looking at the rapidly declining curve on the experiment record sheet.

Zhang Xingyang glanced at the record sheet, and said:

"This result is not bad. The required temperature of our design is 3100 degrees, which is just within his strongest range, so there is no big problem."

"You have to know that this material has not been graphitized yet, and its strengthening will be further improved after graphitization."

"And there is no surface coating treatment, and the strength drop in the face of high temperature environments is exaggerated."

Su Xiao nodded half-understood, expressing that he had learned it.