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Over the past few years, China's bearing industry has developed rapidly, and its output and sales have been the third largest in the world. Nevertheless, China can only be called a big bearing country. There is still a big gap between China and the world's leading bearing countries in the core technology field, especially in aerospace bearings. The key component of aerospace engine is aerospace bearing. It can be said that the quality of bearing determines the height of aerospace.
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Life and reliability of aviation bearings in China are lower than international standards
To ensure the high reliability of aerospace engine, the life of aerospace bearing must be guaranteed. In operation, space bearings not only need to reach tens of thousands of revolutions per minute, bear various forms of extrusion, friction and ultra-high temperature, but also can not appear any damage within cracks. According to the data, the life of main bearings in foreign countries is more than eight times as long as estimated, and the reliability is as high as 98%. In China, the reliability is only three to five times as high as estimated, and the reliability is about 96%. The short life of space bearings in China has become the short plate of space engines. The insufficiency of high-end bearing technology in our country leads to a large number of imported bearings in key fields such as aerospace and robotics, which makes it impossible for us to develop bearings with all our efforts.
R&D of hybrid ceramic bearings in China has officially opened
With the support of the state, Harbin Bearing Company and Harbin University of Technology have cooperated in the research and application of Si3N4 silicon nitride ceramics. Hybrid ceramic bearing combines the excellent performance of metal and ceramics. Its main mechanism is composed of inner and outer ring bearing steel, stainless steel retainer and silicon nitride ceramic ball. According to the data, the mechanical and physical properties of silicon nitride ceramic balls are the best in the field of high performance bearing technology. General bearing steel balls are easy to 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.
Ceramic Bearing Will Solve the Problem of Low Efficiency and Low Speed of Domestic Bearing
Ceramic balls in hybrid ceramic bearings have the function of oil-free self-lubrication, that is to say, when the grease is dried out, the bearing can still operate normally, and its speed can reach 1.5 times that of metal bearings, so it can improve the combustion efficiency and thrust of the engine. Previously, in order to increase the speed and range of anti-ship missiles and thus improve the long-range strike capability of naval vessels in our country, when using domestic metal aeronautical bearings, the rotational speed was increased to 40,000 rpm, smoking began, strong noise was emitted, and then the axle was stopped. According to the design requirements, the turbine rotor should reach 120,000 rpm, so we had to import high-speed aeronautical bearings from abroad to fill it up. Foot requirement.
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