Chapter 1404 Selective Absorbing Metamaterials
The 606 Institute itself does not have the ability to develop aviation materials. Therefore, just like other general institutes responsible for system design, it will propose a series of key indicators based on model needs, and then assign or bid for a unit to undertake the development work.
And just like other Party B, although the latter will attach a test report to the materials, it is just a task to complete after all, and the content in the report is obviously impossible to really cover everything.
In general, it will only include various conventional attributes and relevant indicators proposed by Party A in the development requirements.
When we first designed the turbofan 10G, we did not consider using this part of the coating to shield infrared signals, so in the subsequent acceptance stage, we only examined the thermal insulation performance and overall infrared emission characteristics of the new material according to convention.
To some extent, these two indicators are actually the same thing.
As for the results, although they are indeed slightly different from the old version, they are still on the same order of magnitude.
And the test process just now has proved that the macro temperature shown by the engine is not much different from Liu Yongquan's prediction, which means that there is nothing wrong with the previous test process.
It is simply that this material exhibits a certain property that has not been noticed before.
Liu Yongquan quickly followed Yang Wei to the confidential office of Factory 132 and contacted Researcher Peng Wenzhi, who was responsible for the development of new coatings at the Materials Research Institute.
"Old Peng, it's me, Liu Yongquan."
After the phone was connected, he directly reported to his home and opened the right point:
"There are some problems with the infrared emission characteristics of the HDK305 coating..."
Although the test of the No. 2003 aircraft started early in the morning, everyone had been struggling in the workshop for several rounds. In addition, for life and reliability considerations, it was impossible for aeroengines to start and stop too frequently, so it was actually time when the sun was about to set.
Peng Wenzhi on the other side was about to get off work now, but suddenly he received a call from a party saying that there was something wrong with his product. In an instant, his blood pressure almost exploded. He asked quickly:
"What's the problem?"
Liu Yongquan hesitated for a moment:
"It's not clear yet, but the result is that the thermal signal intensity is particularly low, which is only about half to about one-quarter of the calculated value, and it is not stable at a certain ratio, but like a gate..."
"..."
He spent about a few minutes telling him what he had encountered on the previous day.
Peng Wenzhi felt confused after listening to it: "How is that possible?" He quickly returned to the front of the computer, and after pressing the screen, he quickly found the test report: "Didn't you test the optical and thermodynamic properties during the acceptance before... If you really want to say, the thermal conductivity is several percentage points higher than the previous generation of products?"
At this point, he suddenly paused:
"Wait, what you just said was not the temperature...so you have specifically measured the reflection... or absorption spectrum?"
The tone was slightly unhappy.
Realistically speaking, if Party A wants the material to have certain optical characteristics, then it is enough to directly explain it in the task requirements.
Even if you want to ensure that everything is foolproof, you can directly state it in the contract that a third party jointly recognized by both sides can issue a test report.
Some people who are silent and seek another test are usually manifestations of extreme distrust of Party B.
It’s okay if you don’t trust it, but you still call it out?
We all look down in the same system, how can we work together in the future?
However, Liu Yongquan's mind was full of curiosity at this moment, and he did not pay attention to the subtle changes in the other party's tone: "It's not the spectra measured... I am now at Factory 132, using infrared imaging system and stimulated interference to observe."
Peng Wenzhi was stunned again, and immediately realized that it was a mistake during the communication process, so he turned his attention back to the abnormal situation mentioned by the other party.
"Infrared imaging and stimulated interference are not strictly used as solid material detection methods. If you really want to obtain detailed infrared light characteristics, you still have to do the spectrum..."
He spent his first half of his life in the laboratory, and he was helpless about the wonderful ideas that he occasionally made into engineering.
But Liu Yongquan's response also highlighted a sense of confidence:
"Even if the stimulated interference spectrum cannot keep up with the spectrum in terms of accuracy, it is impossible to have such a large error, right?"
This sentence is reasonable and well-founded, which made Peng Wenzhi lose his paralysis for a moment.
But it also gave him new inspiration: "Old Liu, when you are taking the measurement, is the target being tested exposed to an atmospheric environment?" Liu Yongquan was a little helpless: "We are testing a whole aircraft, and we can't put it in a vacuum tank... That's too outrageous, and it doesn't fit the actual working environment." "That's right... there is indeed a theoretical possibility."
Peng Wenzhi explained: "The atmospheric window bands of infrared detection are 3-5 microns and 8-14 microns. The other parts are easily absorbed by carbon dioxide and water vapor. Therefore, if a material accurately has a high absorption rate in these two window bands, or one of them has a high absorption rate, and all other bands have high transmittance, then it can achieve low infrared signals and high heat dissipation capabilities at the macroscopic level. Our previous infrared emission characteristic tests conducted indiscriminate frequency bands cannot find this..."
At the beginning, he still seemed to have realized it suddenly.
However, when it comes to the end, I was a little skeptical:
"But the material with this characteristic is really ideal. In the past, we usually only dared to write some relevant content in the "Future Work Outlook" section at the end of the paper, otherwise it would be easy to be considered bragging..."
"Our hospital should not be so powerful... right?"
Liu Yongquan was overjoyed at this time, so he didn't care about these things:
"As you say, as long as you cover this coating on the entire surface of the object, the target can completely disappear from the field of view of the infrared imaging system?"
As he said, he subconsciously looked at Yang Wei who was waiting for the results to communicate.
The latter's eyes were also shining at this time.
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If the dual stealth of infrared and radar signals can be achieved, then Project No. 20 will be no regrets for him.
However, Peng Wenzhi is not as optimistic as the two of them: "It is indeed the case in principle...but first of all, the mechanical properties and coating properties of this material are average, and it requires a lot of additives to adhere to the surface of metal or composite materials. It is okay to use less now. If you really want to apply the entire aircraft, the cost and weight may be a problem."
"Of course, there are always ways to overcome this point. More importantly, we should first determine that this characteristic is not an isolated case..."
Liu Yongquan frowned with difficulty: "When chemical composition is determined, can the material characteristics be an example?"
Peng Wenzhi immediately smiled:
"This is hard to say... Although materials science has made great progress in many aspects, it is essentially a more efficient alchemy, unless..."
He said abruptly.
"Unless what?"
Liu Yongquan couldn't help asking.
"Unless it can predict the macro properties of the material according to the microscopic particle arrangement to some extent."
This time, Peng Wenzhi's tone was already full of seriousness:
"So I'm going to contact Torch Laboratory, Academician Chang and others may be able to do it..."
Hearing Chang Haonan's name, Liu Yongquan suddenly felt like he was "passing around and then returning to the origin."
He shook his head with a wry smile, then looked at the desk calendar on the table next to him.
January 16, 2009.
"Mr. Chang... should not be in the capital now."
According to the plan, the "Xuanniao" hypersonic vehicle will conduct the fourth and fifth consecutive flight tests. At the same time, the "Thousand-Minute Sky Patrol" radar network proposed by Chang Haonan has also been deployed, and it will take this opportunity to verify its monitoring and early warning capabilities for hypersonic targets in neighboring space.
Of course, these details must not be explained too clearly to Peng Wenzhi on the other side.
"No more to worry about it..."
Peng Wenzhi spoke quickly:
"If this artificially designed metamaterial can come true, it may be subversive for the entire material science..."
(End of this chapter)