摘要
采用x-射线衍射仪、扫描电镜、大型偏光显微镜、差热和失重分析仪等现代仪器对聚四氟乙烯(PTFE)基固体润滑剂材料的成分、组织结构和组分的物理化学性能及力学性能等进行了表征及分析.结果表明,PTFE、石墨、二硫化钼及铜粉颗粒尺寸均基本保持在30 μm内;碳纤维直径较均匀,基本保持在8～10μm,但长度不均匀;加入填料的固体润滑剂比纯PTFE吸水率高、熔融温度及分解温度低,且会引起氧化分解反应;吸水率大小顺序为:石墨＞碳纤维＞二硫化钼＞PTFE≥铜粉;PTFE基复合材料的表面硬度基本是随着填料的加入量的增加而增加的;在PTFE树脂中加入无机填料均可明显提高其抗压强度,但并不是加入量越多,抗压强度提高越明显.
In virtue of the modem instruments concerned about X-ray diffractometry, SEM, large polarizing microscope and material tester, the inner factors of solid lubricants composed of polytetrafluoroethylene （PTFE） groups, which contain ingredients ,structure, physical and chemical properties of ingredients and mechanical capabilities ,were manifested and analyzed. The result shows that, the dimensions of PTFE, graphite, supramoly and grains of copper powder are all in the range of 30 μm;the carbon fibre has an even diameter in the range of 8 - 10 μm;compared to pure PTFE, solid lubricants filled with additives have a higher absorptivity of water and lower fusible and disaggrega-tire temperature, and more easily result in the oxidation and decomposition reaction ;the sequence of hydroscopic property is：Graphite 〉 Carbon fibre 〉 Supramoly 〉 PTFE≥ Copper powder;the surface hardness of composite materials composed of PTFE groups basically increases with the increase of filled materials, the more the quantity is , the more the rigidity is ;it is obvious that filling with inorganic materials in PTFE resins can improve the compressive resistance, but it is not proper that the more the quantity of materials filled in ,the more obvious the imorovement of intensity is.
出处
《润滑与密封》
EI
CAS
CSCD
北大核心
2005年第6期64-66,99,共4页
Lubrication Engineering
