摘要
本文采用自行设计制造的磨粒侵蚀试验台对聚氨酯、丁苯橡胶、尼龙6和聚四氟乙烯4种高分子材料的磨粒侵蚀行为进行了试验研究,并且通过扫描电镜对试样磨损表面进行了观察分析,分别提出了这4种高分子材料磨粒侵蚀的物理模型和物理过程,阐明了它们的磨粒侵蚀机理:具有一定动能的固体颗粒对材料表层产生微切削;微观裂纹的萌生与扩展导致材料表层微观剥落;材料的力化学分解和热分解;材料表层局部塑性变形发展成塑性断裂而从表面脱落。
Mechanisms of abrasive erosion for polymers including polyurethane, styrene-buta-diene rubber, nylon-6 and polytetrafluoroethylene have been investigated using an abrasive erosion test machine designed by authors. An abrasive liquid containing quartz with particle size from 76 to 450 μm was used as the test medium, the quartz content is in the range of 5-30wt%. The velocity of flow of the liquid ranges from 7. 2 to 11. 1m/s. Experiments were carried out at medium temperature, 63-67℃ From the observations of the abraded surfaces of test samples using scanning electron microscopy (SEM), the physical models and physical process of abrasive erosion of the polymers were presented. It has been concluded that the mechanisms of abrasive erosion for polymers examined could be summarized as follows: micro-cutting action of the abrasives with certain kinetic energy; micro-de-laminating of the surface layer of materials resulting from initiation and propagation of mierocracks; mechanochemical and thermal decompositions of materials; and surface peeling resulting from plastic fracture expanded from local plastic deformation of material.
出处
《摩擦学学报》
EI
CAS
CSCD
北大核心
1993年第2期105-112,共8页
Tribology
基金
高等学校博士学科点专项科研基金
关键词
高分子材料
磨粒侵蚀
物理过程
abrasive erosion , polymer, physical process, mechanism
