In recent years, China's bearing products have developed rapidly, and bearing production and sales have now ranked third in the world. Even so, China is now only hit by bearings, and there is still a large gap in the core technology field from the world's bearing powers, especially in Aerospace bearings. Aerospace bearings are key components of aerospace engines, so the quality of the bearings determines the height that can be achieved by aerospace. So: a professor from Southwest University of Political Science and Law said: The bearing technology content is extremely high, it is a "scale" to measure a country's scientific and technological strength.

China's hybrid ceramic bearing research and development officially started

With the support of the country, Harbin Bearing Company and Harbin Institute of Technology jointly launched the research and application of Si3N4 silicon nitride hybrid ceramics. Hybrid ceramic bearing combines the excellent performance of metal and ceramic. Its main mechanism is composed of inner and outer ring bearing steel, stainless steel retainer and silicon nitride ceramic ball. According to materials, the comprehensive mechanical and physical properties of silicon nitride ceramic balls are the best in the field of high-performance bearing technology. At high temperatures, ordinary bearing steel balls can easily lose strength and hardness, while silicon nitride ceramic balls can maintain their original hardness at 400 degrees Celsius and fail at 800 degrees Celsius.

China's aviation bearing life and reliability are lower than international levels

To ensure the high reliability of the space launcher, it is necessary to ensure the life of the space bearing. The aerospace bearing does not only need to reach tens of thousands of revolutions per minute when it is running, it can accept various ways of squeezing force, friction force and ultra-high temperature, and it cannot show any damage within the cracks. According to materials, the life of foreign aerospace main bearings is more than eight times the estimated, and the reliability is as high as 98%, while domestic only 3 to 5 times the estimated, the reliability is about 96%. The short life of China's aerospace bearings has also become a short board for aerospace launchers. The lack of high-end bearings in China has resulted in a large number of imported bearings in key areas such as aerospace and robotics, which also makes China have no choice to develop bearings.

China becomes the fifth bearing consumer country after the United States and Japan

Today, after switching to a self-made hybrid ceramic bearing, the bearing has been directly requested for 5 hours of continuous operation, which also allows China to break through the foreign monopoly on high-end bearings in China. As usual, after AVIC bought Harbin Bearing Company, it invested heavily in expanding the high-performance aerospace bearing industry. Soon, hybrid ceramic bearings will become the country's main force in high-end weaponry and aerospace bearings, which also makes China a successor to the United States. , Japan, Sweden, etc., the fifth country that can consume a large number of aerospace ceramic bearings.

Ceramic bearings will deal with the problem of low efficiency and low speed of domestic bearings

The ceramic ball in the hybrid ceramic bearing has the function of oil-free self-smoothing, that is, the smooth running of the grease can still make the bearing run normally, and its speed can reach 1.5 times that of the metal bearing, so it can make the initiator improve the quenching efficiency and increase its thrust. Previously, in order to increase the speed and range of anti-ship missiles, thereby improving the long-term strike ability of Chinese naval vessels, when using domestic metal aviation bearings to test, the speed increased to 40,000 rpm and it started to smoke and emit intense noise, and then held the shaft. The suspension was requested, and the turbine rotor was required to reach 120,000 rpm according to the design. Therefore, high-speed aerospace bearings were imported from abroad to satisfy the request.