Technology of the production components of friction units from polymeric composite materials
Keywords:
ultrasonic pressing, polytetrafluoroethylene compositeAbstract
In the article is examined the influence of the regimes of ultrasonic extrusion on the mechanical properties of polymeric composite material on the basis of polytetrafluoroethylene and the development of the technology of the production of the components of friction units, by the method of ultrasonic extrusion. In the process of the ultrasonic extrusion of polymers significantly is facilitated appearance and development of the plastic deformation of the particles of the powder, is accomplished the activation of dislocations, proceeding as a result the absorption of acoustic energy in the places of the defects of crystal lattice and other structural imperfections. Because of this in short time occur the local heating of material around these sources of absorption, an increase in the molecular mobility, which causes the more intensive development of plastic deformation. Ultrasonic action can be successfully used for the solidphase technology of obtaining (synthesis) polymeric composite materials. Especially this is urgent for the dispernonapolnennykh modified composite materials on the basis of polytetrafluoroethylene(PTFE). The perfection of the technology of obtaining the modified politetrafluoroethylene
in the direction of the application of the ultrasound of large intensity directly during the extrusion of composite makes it possible to reach a considerable increase in its mechanical and tribotechnical properties. The purpose of this work is a study of the influence of the parameters of ultrasonic extrusion on the mechanical properties of composite material on the basis of polytetrafluoroethylene and development on this the basis of the technology of
the production of slide bearings. Composite material on the basis of polytetrafluoroethylene
with modifying addition 5 mass. % of hexagonal nitride of boron was the subject of a study.
It is shown that the introduction of ultrasonic fluctuations into the pressed material leads to an increase in the limit of strength and modulus of elasticity of the synthesized composite. So substantial increase in the mechanical properties, testifies first of all about the change in the structure of composite material, which leads to an increase in the limit of strength and
modulus of elasticity of polytetrafluoroethylene of modified by hexagonal nitride boron.
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