Full
WU Di (1997-), male, Master candidate. E-mail: 2003190004@cugb.edu.cn
Outline
Attapulgite and wollastonite powders modified by a mechanochemical method were added to polytetrafluoroethylene (PTFE), and then the mineral/polymer composite was prepared by mechanical stirring and cold pressing sintering. The physical and chemical properties, friction and wear characteristics of the composite were investigated X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, thermogravimetry-differential scanning calorimetry, polarized microscopy, X-ray photoelectron spectroscopy, Shore hardness test and ring block friction and wear test, respectively. The results show that the crystallinity and glass transition temperature of the PTFE composite decrease, the hardness increases, the friction coefficient increases slightly, and the wear rate decreases significantly after adding attapulgite and wollastonite into the composite. It is indicated that attapulgite and wollastonite are beneficial to the formation of the transfer film on the surface of the metal friction pair, thus effectively improving the self-adaptability of the friction interface between the PTFE composite and the counter metal friction pair and reducing the wear rate of the friction pair.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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