【摘要】 液氢 /液氧火箭发动机涡轮泵用球轴承工作在超低温高转速重载荷条件下 ,需要采用合适的材料匹配和可靠的固体润滑。对由 9Cr1 8套圈和球组成的钢制轴承 ,常采用 PTFE复合材料保持架及套圈和球上表面溅射PTFE膜层或 PVD软金属膜层来实现润滑 ,其主要失效可归纳为磨损、胶合及保持架断裂 3种形式。采用氮化硅球的混合式陶瓷轴承以及套圈表面等离子体淹没离子注入 Ag润滑膜层的应用 ,提高了轴承的寿命和可靠性。陶瓷轴承技术和离子改性技术将满足该轴承技术发展的需要。更多还原

【Abstract】 The bearings for liquid hydrogen / oxygen turbo-pump which are operated under extreme conditions of ultra-low temperature, high-speed and heavy-loads need suitable material matching and reliable solid lubrication. As for the steel bearings that are composed of 9Cr18 rings and balls, they are lubricated by PTFE composite retainer and thin modified films on races and ball surfaces, which can be sputtered PTFE films or PVD soft-metal films. Abrasive, scuffing, and retainer rapture are as three main failure modes of this kind of bearing. The application of silicon nitride ceramic balls and Ag plasma immersion ion implantation on steel rings could enhance life and reliability of the bearing. The developing technology of ceramic bearing and ion implantation modification would match the growing needs of these cryogenic bearings.更多还原