Definition of ultra-low temperature bearings:
Ultra-low temperature bearings are bearings specifically designed to function in environments characterized by extremely low temperatures, typically below -150 ℃. These bearings incorporate special materials and designs to ensure optimal performance and stability under such extreme cold conditions. They find widespread applications in industries such as aerospace, liquefied natural gas, and cold chain logistics.

Applications of ultra-low temperature bearings:
Ultra-low temperature bearings find widespread utilization across various industries, including aerospace, liquefied natural gas, and cold chain logistics. In the aerospace sector, they are employed in critical components such as gesture control systems and propulsion mechanisms for satellites and rockets. Within the liquefied natural gas industry, ultra-low temperature bearings are integral to the transmission systems of storage and transportation equipment. In cold chain logistics, these bearings facilitate the smooth operation of transmission systems in refrigeration equipment, ensuring stability in low-temperature environments.

Materials for ultra-low temperature bearings:
The selection of materials plays a critical role in the performance of ultra-low temperature bearings. To withstand the challenges of extremely low temperature environments, these bearings employ materials known for their low-temperature resistance, such as stainless steel and nickel-based alloys. These materials retain favorable mechanical properties and stability even at exceedingly low temperatures, enabling the bearings to operate reliably over extended periods.

Design considerations for ultra-low temperature bearings:
The design of ultra-low temperature bearings is of paramount importance. In addition to conventional rolling elements and cages, special attention must be given to the choice of lubricants and sealing performance. Lubricants tend to solidify or thicken at extremely low temperatures, necessitating the use of specialized lubricants like grease or solid lubricants in ultra-low temperature bearings. Effective sealing is also crucial to prevent external impurities and gases from infiltrating the bearing's interior.

Working temperature range of ultra-low temperature bearings:
The working temperature range of ultra-low temperature bearings varies depending on the specific application field. In the aerospace industry, ultra-low temperature bearings typically operate within a range of -150 ℃ to -270 ℃. For liquefied natural gas applications, the working temperature range is typically around -163 ℃. In cold chain logistics, the working temperature range is determined by specific requirements, commonly falling between -40 ℃ and -70 ℃.