Military industrial hegemony

Chapter 498 Ceramic Brake Pads

"Yes, yes, let's visit first." Li Gong said with a smile after wiping his red eyes.

Academician Tu looked at the people standing behind him and nodded.

Immediately, Li Gong and Wu Gong nodded, and then guided everyone to go outside through a door inside. When they walked outside, Li Gong pointed to these constructions and introduced with a smile: "Teacher, chief, this is our entire material laboratory." It consists of multiple parts. At present, our classification includes inorganic non-metals, mainly including the development of ceramic materials, semiconductor materials, and some engineering plastic materials, etc. It is mainly in the row of buildings on the west. The area with the most buildings in the north is the metal material research area. Under this area, we are divided into iron-based metals (ferrous metals), non-ferrous-based metals (non-ferrous metals), alloy materials and other research areas, specifically for this metal. research together."

"These buildings here." Li Gong pointed and said: "This is the research area of ​​composite materials. The composite materials are composed of two or more materials in an appropriate combination. Generally, one material As the matrix, another material is used as the reinforcement. For example, we extract fibers from a variety of woods, and then form a composite board. Its hardness is no less than that of some metal materials, and its flexibility is also greater than that of Some metals are much better. Our current general classification is like this, but we are planning to develop a new module, that is, this polymer material. We are still in the blank stage of this, and other countries in the world have already had different The small achievement, we should catch up. It's just because our ability is limited, we can't support this research. However, Xiao Jiang has promised me that we will carry out research in this area as soon as our economic conditions permit in the future. research work."

"Confused!" Academician Tu interrupted: "The technology of polymer materials is a technological revolution in the field of materials science. In order to say that mastering this aspect is equivalent to mastering the production lifeline of high-precision process equipment .It’s really short-sighted, what you learned before has been learned into the dog’s belly.”

Being scolded by Academician Tu, Li Gong's face was flushed red.

Jiang Chen looked at the embarrassing expressions of several people and quickly explained: "Old Tu, we are to blame for this matter. We didn't think carefully. As soon as we have spare funds, we will start this one immediately. Besides, it's us I want to do it, but there are no talents in this area. You know the current situation in China. Basically, those who have a little understanding of this area or graduated from colleges and universities with this major will be asked to leave by others. It is very difficult in our situation. Not many people are willing to come.”

"Isn't there me? As long as you build it up, I'll find someone to come for you. If it doesn't work, I'll come in person." Academician Tu waved his hand and interrupted.

Hehe, looking at Deputy Director Song's expression, Jiang Chen smiled and said, "That's a good relationship, I'll write it down first, and when we have enough money, it will definitely be done right away."

"Let's go, let's not take a look." Academician Tu nodded.

"Okay." Li Gong began to guide everyone to the inorganic non-metal research area.

After everyone entered, Li Gong pointed to the facilities and the busy people inside and said: "This is the research group of inorganic non-metallic materials. They mainly study this non-metallic materials. At present, our focus is mainly on this high-strength ceramics. There is also research on engineering plastics. The product you are seeing now is the automotive ceramic brake pad that we use high-strength ceramics. We mix the metal powder and high clay of this intended composition and then fire it at high temperature. A special ceramic is formed, which we call high-strength ceramics or cermets. It is a material made of metal and ceramic raw materials, and has some advantages of metal and ceramics, such as the toughness and bending resistance of the former The latter has high temperature resistance, high strength and oxidation resistance, etc. When the brake pad is braked at high speed and vigorously, a high temperature is generated on the friction surface. According to the measurement, it can reach 800-900 degrees, and some are even higher. At this high temperature Under this condition, the surface of the brake pad will have a reaction similar to cermet sintering, which makes the brake pad have good stability at this temperature. However, the traditional metal brake pad will not produce sintering reaction at this temperature, because the surface temperature will rise sharply. Melt the surface material and even produce air cushion, which will cause the braking performance to decrease sharply or the brakes will be completely lost after continuous braking. And after installing ceramic brake pads, there will be no abnormal clamor (that is, scratching sound) during normal driving .Because the ceramic brake pad does not contain metal components, it avoids the metal clamor of friction between the traditional metal brake pad and the counterpart (that is, the brake pad and the brake disc). During the braking process, heat is generated due to friction, and the working temperature As the temperature increases, the friction material of the general brake pad is affected by the temperature, and the friction coefficient begins to decrease. When the temperature of the brake disc reaches 650 degrees, the friction coefficient of the ceramic brake pad is still around 0.45-0.55, which can ensure that the vehicle has good braking performance. Performance. Moreover, ceramics have good thermal stability, low thermal conductivity, and good wear resistance. The long-term use temperature is 1000 degrees. This feature makes ceramics suitable for high-performance requirements of various high-performance braking materials. It meets the technical requirements of high speed, safety and high wear resistance of brake pads."

Seeing Li Gong said so much, Deputy Director Song looked at the off-white brake pad in front of him, and then said with some concern: "We all know that this ceramic is fragile. But it is suitable for automobile brakes, and the Securities Regulatory Commission The brake pads bear a huge amount of force. So can your brake pads withstand so much force?"

"The chief's question is good." Li Gong now appreciates: "This is also the most troublesome thing when we re-developed this ceramic brake pad. But do you remember the metal ceramic I just mentioned? It is an excellent solution to this problem. Our brake pads have good mechanical strength and physical properties, and can withstand large pressure and shear forces. Friction material products need to be drilled, assembled, etc. before assembly and use. Machining can make the brake pad assembly. Therefore, the friction material must have sufficient mechanical strength to ensure that there will be no damage and fragmentation during processing or use. And its service life is long, almost the same as that of ordinary brake pads. Twice. The service life of our general ordinary brake pads is less than 6 kilometers, while the service life of ceramic brake pads is more than 10 kilometers.”

"Oh? Such a good material, it can have a very good role in promoting our high-tech industry." Deputy Director Song looked at Jiang Chen with some displeasure and said, "I said, Xiao Jiang, you can't be selfish. Take it."

(End of this chapter)