In the eyes of materials scientists, the progress of human military technology or civilian technology has one of the most obvious scales. This is the material. What is the degree of social civilization? It can also be expressed from the material technology. Since ancient times, humans used wood and stones. Continuously learn to refine new metals. In the past 100 years, materials technology has embarked on a fast track. Not only have there been huge breakthroughs in metal materials, new titanium alloys, new aluminum alloys, and new steel alloys have become the core of supporting aerospace ships, weapons and civil industries.
In recent years, non-metallic materials and composite materials have sprung up, especially carbon fiber composite materials. They have become the best materials for aerospace. The materials are known for their low specific gravity, high modulus, good thermal stability, and good dimensional stability. One of the advanced levels of the structure of rockets, satellites, and spacecraft is the amount of composite materials, especially the amount of carbon fiber composite materials. The more carbon fibers are used, the more obvious the effect of weight reduction. The more advanced aircraft or spacecraft are also the focus of scientific research in the world. Recently, , NBCL Carbon Fiber Research Institute once again achieved a major breakthrough in the field of domestic high-strength high-modulus carbon fiber preparation technology, successfully developed CNI QM65 (M65J level) high-strength high-modulus carbon fiber, the product has been tested by 4 professional testing institutions in China, and the fiber modulus is stable 630GPa, the highest tensile modulus of the product has reached 639GPa.
Carbon fiber has become an essential core material for aerospace
Many friends may be wondering how this M65J carbon fiber is different from the previously widely reported T-700 and T-800. You must know that China has finally broken through the T-1000 carbon fiber technology in recent years through more than 10 years of efforts. On the thousand-ton production line, the stable production of T-700 and T-800 high-strength carbon fiber has been achieved, and it has been widely used. What is the difference between them? In short, the T series and the M series are both a type of carbon fiber. Standard, the T series emphasizes high tensile strength, and is often used in aviation or aerospace rocket missile shells, allowing certain deformation, as long as it does not break.
However, the M series is not the same. The main emphasis is on the high modulus and good thermal stability. The simple explanation is that the material deformation is small after being subjected to external forces, and the material size change is as small as possible after being subjected to high and low temperature environments. Spaceships have special significance. On spaceships or satellites, a large number of high-precision probes need to be installed. These devices need to be very tightly positioned, and they must be stable for a long time. In space, between the sun and the back surface The temperature difference can reach 300-400 degrees, so the use of M series of high-strength carbon fiber is the best choice. Other materials are either too heavy or easily deformed by heat, or the strength is too poor, which is not suitable.
M65J high-strength carbon fiber is important for Chinese satellites and spacecraft manufacturing spacecraft
For a long time, due to the importance of M series of high-strength carbon fiber, China’s outsourcing is difficult, and it is often subject to foreign embargoes. The Ningbo Institute of Chinese Academy of Sciences established a special fiber division in 2008 to study M series of high-performance carbon fiber. As a research goal and continuous breakthroughs, M50J grade high-strength high-modulus carbon fiber was successfully prepared in May 2015. After testing by aviation, aerospace, nuclear energy and other units, the tensile strength and tensile modulus were as high as 5.12GPa and 475GPa, respectively. Achieve or even surpass similar foreign products, and then carried out continuous and stable production. At the end of 2015, the business department launched high-strength and high-modulus carbon fiber research and development, and successfully achieved a higher level of M55J-level preparation technology breakthrough at the end of January 2016. At present, Ningbo Material Institute has the continuous and stable production capacity of M40J, M46J, M50J and M55J grade products.
This is a huge breakthrough. To prepare carbon fiber such as M65J, you have to obtain materials similar to T-800 carbon fiber raw yarn. The key lies in how to obtain extremely stable and uniform acrylic filaments. It is not known that from the perspective of high-strength carbon fiber manufacturing technology, the strength index of simple laboratory samples is not difficult to achieve, nor does it represent everything. The most important thing is the stability of mass production. NBCL breaks through M65J carbon fiber The preparation technology is only the beginning. How can it be stably produced on the 1000-ton production line is the real test. This is also the core secret of carbon fiber manufacturers worldwide.
Chinese spacecraft and satellites have long continued to use high-strength carbon fiber
In the past, high-strength carbon fibers were mainly concentrated in the hands of the United States, Japan, and Europeans. They have strict control over exporting to China. With the continuous efforts of Chinese material people, they have continued to break through the mass production of T series and M series carbon fibers. . .