Chapter 323: 1st generation technology

Thermal spraying is a material processing technology. Its principle is to cover a substrate with a coating to change certain aspects of the performance of the substrate. What material is used for the coating is very particular. Different materials can achieve different effects. For example, the titanium nitride coating can improve the wear resistance of the material, and the zirconia coating can also be used in addition to wear resistance. To high temperature resistance.
As a materials scientist, Qin Hai knows a little about the properties of various materials. As soon as Leng Yuming said that the material to be coated by the customer was ferrite, he knew who the other party was, at least in that era. The most important role of ferrite materials as material coatings is to absorb radar waves, and only the military needs this function.
The use of ferrite coatings to achieve the stealth effect of aircraft and other equipment was a very common practice at the time. Although belonging to the military secrets of various countries, some clues can also be seen from some literature. Researchers in the field of engineering have just learned this technology from a few words in foreign literature and started related experiments. As a traveler, Qin Hai knows the development of this technology and its existence. Various defects.
The so-called ferrite refers to various types of compounds formed by combining iron with oxidation. The chemical formula of the spinel ferrite includes one divalent metal ion, such as divalent manganese, cobalt, nickel, copper, etc .; two trivalent metal ions, generally trivalent iron ions; and four oxygen ion.
The use of spinel-type ferrite as the absorbing material has a relatively simple process and relatively low price, but its disadvantages are that the density is too large and the absorbing frequency band is too narrow. If you want to increase the bandwidth of the absorbing wave, you need to use multiple coatings, each coating is directed to a frequency band, and this makes the coating too thick, which will increase the weight of the equipment.
For example, the specific gravity of the ferrite material is about 5 if the coating thickness is 4 mm. With a coating area of ​​50 square meters, the weight of the entire coating can reach 1 ton, which is undoubtedly an unbearable additional burden for stealth aircraft.
Qin Haiyi did not specialize in the study of stealth materials. However, I have participated in some peripheral consulting work, and I have some understanding of some major technical direction issues. He knew that focusing on ferrite materials was a detour, so he couldn't help but remind himself of his colleagues.
Li Zhongyun and Wu Honglin are naturally not engineers at Tongjiang Mining Machinery Plant. Their real identity is a researcher at the Military Engineering 70x Institute, who is conducting research on stealth materials for stealth fighters. At present, the research ideas of 70x on stealth materials are still limited to the use of spinel type ferrite materials. Researchers purchased three thermal sprayers from Qingfeng Agricultural Machinery Factory through the Mining Machinery Factory and conducted spray experiments on ferrite materials. They found that the adhesion of the materials was insufficient, and they could not solve the problem themselves. That's why this trip to Qingfeng Factory was made.
According to the original ideas of Li Zhongyun and Wu Honglin, they just went to the Qingfeng Factory to learn about the technical details. The technical personnel of the Qingfeng Factory did not really need to be involved in this research. After all, this is a confidential project involving the defense military industry. Let civil society participate. Unexpectedly. As soon as Qin Hai came up, he said categorically that they were on a different road, and they said that there was a hint of "employment without doubt" and they had to pay attention.
After the two left the Qingfeng factory, they called the unit leader and talked about the situation. A researcher at the 70x happened to have visited the missile base of Anhe at that time to participate in the diagnosis of the missile's tail. He knew Qin Haiqi and said so. The unit leader immediately instructed Li and Wu to go to the provincial military region to contact Yue Guoyang in order to get a comprehensive understanding of Qin Hai's background.
After listening to the two narratives, Yue Guoyang patted his chest and said that Comrade Qin Hai can be trusted. As early as a few years ago, the Political Department of the Provincial Military Region had screened his political background. In the past few years, his business has become bigger and bigger, and there has been no possibility of joining together with foreign hostile forces. Regarding Qin Hai's assertion that ferrite spraying was a misguided matter, Yue Guoyang laughed and told Li and Wu that Qin Hai's accomplishments in materials science were unfathomable. If they are in trouble, finding Qin Hai is the best way.
With the mentality of being suspicious, Li and Wu returned to Qingfeng Factory and asked to meet Qin Hai. According to their ideas, if Qin Hai can tell their origins accurately, then it proves that Qin Hai really knows stealth materials, and it is indeed possible to help them. If Qin Hai had guessed what they were doing wrong, there would be no need to talk about the later things.
"Chairman Qin, we didn't know your situation before, so some things are kept secret from you, can you understand this? You're right, we are doing stealth materials for airplanes, why do you think ferrite Spraying is a misunderstanding? Isn't that done by foreign aircraft and missile stealth technology? "Wu Honglin asked.
Qin Haidao: "Because our factory makes thermal spray equipment, I have also paid a little attention to this technology. You are right, foreign countries do use ferrite materials as stealth materials for aircraft. There is not much literature, but some clues can be gleaned. However, as far as I know, the use of ferrite materials as stealth materials can only be regarded as the first generation of stealth technology. The defects of ferrite materials in stealth, presumably you are also clearly."
"We are working hard to overcome these shortcomings, and we use the thermal spray process is also an attempt." Wu Honglin said.
Qin Hai nodded and said, "Yes, judging from the literature, the foreign approach is to use epoxy resin and ferrite materials to make coatings for surface coating. You can use thermal spraying to improve the coating. Strength and reduced resin use is indeed an improvement and deserves recognition. "
"..." Li Zhongyun and Wu Honglin were speechless. If Qin Hai's words came from the director's mouth, they might still be a little excited, but such a young man said so old-fashionedly before the two experts. What "worthy of affirmation" seems to be a weird feeling.
Qin Hai didn't care about the emotions of the two, and he was not as professional as the two in terms of stealth materials, but to understand the future technology trends, he was enough to be a teacher of the two.
"The defects of ferrite materials can not be fully compensated by changing the coating process. Therefore, other stealth materials are currently being studied abroad. According to my judgment, ferrite materials will be completely replaced in the future. We now spend With too much energy in ferrite materials, the end result can only be one shot behind. Since we know that other materials are more promising, why can't we use limited human and financial resources in these areas? "Qin Hai generously Chen Cidao.
Li Zhongyun and Wu Honglin exchanged a startled look, and then tentatively asked: "Chairman Qin, do you think that ferrite materials must be out of date, then what materials will be used for stealth technology in the future, do you know?"
"Don't dare to understand, just some personal views, it can be regarded as a good example." Qin Hai said, "According to my analysis, microwave stealth materials can be divided into two categories. The first category is inorganic materials, including various metal powders, metals Fiber, carbon black, carbon fiber, graphite material, ceramic material, ferrite material and isotope material, etc .;
The second category is organic polymer materials, including various conductive polymer materials, such as polyethylene blocks, polyaniline, polypyrrole, polythiophene, etc., and organic metal complexes.
In the long run, organic polymer materials are more promising because they have better plasticity. After adding various dopants, they can achieve a large bandwidth of absorption, and their specific gravity is far lower than that of ferrite materials. Effectively reduce the aircraft's own weight. "
After Qin Hai said this, Li Zhongyun and Wu Honglin were dumbfounded. Qin Hai said these situations, they have seen some clues from some foreign literature, but far less clear than Qin Hai's generalization. As soon as Qin Hai said, they knew that these words were definitely not groundless. People's understanding of stealth materials was already above their two experts.
Since Qin Hai had already planned to help each other, he was too lazy to hide anything. These big ideas, sometimes just a layer of window paper, feel mysterious and unpredictable when they are not opened, and they are only found when they are opened. If Li and Wu want to investigate where his knowledge came from, he can refer to a few open documents for them to read carefully. If they can't read these things from Qin Hai, it can only be blame They lack academic sensitivity. Who can make this clear?
"Chairman Qin, what you said is very good. Can you go back with us, I think, Mr. Gu and we will definitely have many common languages ​​with you." Wu Honglin said excitedly.
Qin Hai hesitated for a moment, and asked, "General Manager Gu? Wouldn't it be Teacher Gu Qinyuan?"
"Exactly, why does Chairman Qin know our Chief Engineer Gu?" Li Zhongyun said in astonishment ~ EbookFREE.me ~ Uh, God has been in communion for a long time, but he has never been able to meet. Qin Hai quickly veiled. This general engineer Gu is also regarded as a big bull in the material industry, but because he has been in the military system and many achievements cannot be found in academic journals, his reputation in the society is not great. Qin Hai has dealt with him several times. As for this life, he has heard the name at Chen Heqian, so it can be justified to say that the divine communication.
Li Zhongyun said: "We are both assistants to President Gu. This time, Mr. Gu asked us to come over. Two days ago, we called back and talked about your situation. President Gu was very interested in your opinion and explained We need to ask you a little bit about it. I can't think of Chairman Qin's thorough understanding of stealth materials, so we would like to take the liberty of asking you to meet our chief engineer. He certainly has many questions to discuss with you. "
ps:
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