Mechanical Property
sourceBaidu
publisherTina
time2016/09/14
- Its friction coefficient is very small, only 1/5 of polyethylene, which is an important feature of the whole fluorocarbon surface, and because of the low molecular force between fluorine carbon chain molecules, so PTFE is not sticky.
Its friction coefficient is very small, only 1/5 of polyethylene, which is an important feature of the whole fluorocarbon surface, and because of the low molecular force between fluorine carbon chain molecules, so PTFE is not sticky.
The mechanical properties of PTFE in the wide temperature range of -196 ~ 260 degrees C are all maintained good mechanical properties. One of the characteristics of the whole fluorocarbon polymer is that the low temperature is not the same.
PTFE density is larger, for 2.14 a 2 20g/cm3, almost does not absorb water, the equilibrium water absorption rate is less than 0 01%.
PTFE is a typical soft and weak polymer, the interaction between large molecules is small, stiffness, hardness, strength are small, in the long-term effect of stress will be deformed.
Prone to creep phenomenon of PTFE load, is the typical cold flow of.PTFE plastic creep with compressive stress, different temperature and crystallization temperature, the higher the greater the degree of crystallization of.PTFE creep in between 55% and 80%, the creep of not more than 2%; when the crystallinity in the above 55% and 80%, the creep strain increases rapidly.
PTFE mechanical properties of the excellent characteristics of the friction factor is small, between 0.10 a 0.01, in the existing plastic materials, and even the smallest of all engineering materials.
The friction coefficient of PTFE increases with the increase of sliding speed when the line speed reached more than 0.5 of a 1 0m/s and tends to be stable; the static friction coefficient is less than the dynamic friction factor, this feature is used for bearing manufacturing, which can reduce the starting resistance, from the start to run very flat friction coefficient decreases with the stability of.PTFE with the increasing of the load, when the load reaches above 0.8 MPa tends to be constant. In high speed, high load, the friction coefficient is less than 0 PTFE from 1 to PTFE ultra low temperature melting point, the friction coefficient is almost unchanged, only when the surface temperature is higher than the melting point, the friction coefficient is only increased sharply.
Due to the low molecular weight, PTFE hardness is low, easy to wear by other materials. However, as long as the surface roughness of the grinding material is appropriate, can reduce the amount of wear of PTEF to a considerable extent.