氧化物/尼龙1010复合材料滚动疲劳行为研究

Study on the Rolling-tired Property of Nylon Composites

以我国自主研制的尼龙1010为基体,氧化铁(Fe3O4)和氧化铜(CuO)为增强剂,进行氧化物/尼龙复合材料的滚动疲劳实验,研究氧化物/尼龙复合材料的滚动疲劳机制。通过实验发现周期性应力导致在材料临界深处形成显微裂纹和显微空穴成核,裂纹扩展导致形成片晶形磨屑,显微裂纹和显微空穴成核是剥层磨损的主要因素。氧化物颗粒割裂了尼龙1010的基体,在接触应力和摩擦热的复合作用下,表面金属氧化物颗粒由于复合材料表面界面疲劳开裂而剥落,形成表面疲劳。30%CuO/尼龙1010复合材料的抗滚动疲劳磨损性能最好,疲劳磨损量只有尼龙的70%左右;10%Fe3O4/尼龙1010复合材料耐磨性能最差,滚动疲劳磨损量是尼龙的2.4倍。

With micron-Fe304 and micron-CuO as an intensifier of the nylon 1010 ,the rolling-tired test of nylon composites was studied. The rolling tired mechanism of oxides/nylon composites was analyzed. Through a lot of test, the results show that many tiny cracks and holes are formed in the critical depth of the nylon composites with the action of periodical stress. Cracks spread brings about forming lens triturate. Tiny cracks and holes are the major element of the surface wear. The oxides grain cuts apart the base of nylon 1010. Under contacting stress and friction heat action, the oxides grain peels to form surface tired on the surface of nylon composites. The test shows that 30% CuO/nylon 1010 composites have the best rolling-tired wear resistance function, its worn mass is only the 70% of nylon＇ s;10% Fe3O4/nylon 1010 composites have the worst rolling-tired wear resistance function, its worn mass is 2.4 time of nylon＇ s.