氮化硅陶瓷球加工缺陷分析与无损检测技术研究

氮化硅陶瓷轴承球具有优良的综合机械性能，在航空、航天等领域有广泛的应用前景。然而在陶瓷球加工的各个阶段都能产生表面缺陷，处于表面和次表面的加工缺陷能显著降低陶瓷球的疲劳寿命。本文综述了陶瓷球的加工方法、加工缺陷的形成与扩展及其无损检测技术的研究进展。制造高强度结构陶瓷的关键是避免材料制备过程中形成的缺陷，球坯材料的显微结构、材料缺陷和机械加工工艺参数对成品球的质量有显著影响。国内外采用射线检测、超声波检测、渗透检测、激光散射等多种方法进行陶瓷球表面缺陷检测研究。由于陶瓷球表面缺陷具有多样性且球表面不可展开，至今还没有完善的无损检测方法。

Processing Defect Analysis and Nondestructive Evaluation Technology for Si3N4 Bearing Ball

Silicon nitride bearing balls with superior mechanical properties have great future in aerospace and super precision bearing applications.But surface defects on ceramic bearing balls can be brought at any manufacturing stage.Surface and subsurface defects significantly reduce the rolling contact fatigue lifetime.Initiation,propagation and nondestructive evaluation(NDE) of defects in the manufacturing procedures are reviewed.The key to successful processing of high strength ceramics is to avoid producing related defects.Many investigations show that material microstructures and defects,as well as mechanical processing parameters integrally influence the final surface quality.Many NDE technologies such as radiation,ultrasonic,dye-penetration and laser scatter have been studied for ceramic bearing balls surface inspection around the world.The difficulties to develop NDE system for ceramic bearing balls caused by the variety of defects and surface unfolding mechanism design have not been solved yet.