Ningbo Feiyu Bearing Co.,Ltd

China's research and development of hybrid ceramic bearings officially started

With the support of the state, Harbin Bearing Company and Harbin Institute of Technology collaborated on the research and application of Si3N4 silicon nitride hybrid ceramics. Hybrid ceramic bearings combine the excellent properties of metal and ceramics. Its several main structures are composed of inner and outer ring bearing steel, stainless steel retainers and silicon nitride ceramic balls. According to the material, the comprehensive mechanical and physical properties of silicon nitride ceramic balls are the best in the field of high-performance bearing technology. Ordinary bearing steel balls can easily lose strength and hardness at high temperatures, while silicon nitride ceramic balls can maintain their original hardness at 400 degrees Celsius, and fail at 800 degrees Celsius.

The life and reliability of Chinese aviation bearings are lower than the international level

To ensure the high reliability of the aerospace launcher, it is necessary to ensure the life of the aerospace bearing. Aerospace bearings have to reach tens of thousands of revolutions per minute when they are in operation, and accept various types of squeezing force, frictional force and ultra-high temperature, and can not show any damage within cracks. According to the material, the service life of foreign aerospace main bearings is more than eight times the estimate, and the reliability is as high as 98%, while the domestic only needs 3 to 5 times the estimate, and the reliability is about 96%. The lifespan of China's aerospace bearings has also become a shortcoming of aerospace launchers. The lack of technology in high-end bearings in my country has led to a large demand for imported bearings in key areas such as aerospace and robotics. This also makes my country have no choice in developing bearings.

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

Nowadays, after switching to self-made hybrid ceramic bearings, the bearing directly undergoes a request for 5 hours of continuous operation, which also allows China to break through the foreign monopoly on my country's high-end bearings. In the past, after the acquisition of Harbin Bearing Company by AVIC, it invested heavily to expand the high-performance aerospace bearing industry. Soon, hybrid ceramic bearings will become the main force in the national high-end weapon equipment and the aerospace field in bearing, which also makes China a successor to the United States. , Japan, Sweden, etc., the fifth country that can mass-produce aerospace ceramic bearings.

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

The ceramic ball in the hybrid ceramic bearing has an oil-free and self-smoothing function, that is, the bearing can still operate normally after the smooth grease is dry, and its speed can reach 1.5 times that of the metal bearing, so it can improve the engine's extinguishing efficiency and increase its thrust. Previously, in order to increase the speed and range of anti-ship missiles so as to improve the long-range strike capability of Chinese naval ships, when using domestic metal aviation bearings in experiments, the speed increased to 40,000 revolutions every minute, smoke and intense noise started, and then the shaft was hung. Suspended, and according to the design request, the turbine rotor had to reach 120,000 rpm. For this reason, high-speed aviation bearings had to be imported from abroad to meet the request.