The vacuum-plasma multilayered systems containing titanium nitride, diamond like coatings and solid lubricant are able to solve anti-friction tasks in different wear conditions more sufficiently.
In the present work our recent results on the development of multilayered wear resistant coatings for sliding friction applications are reported. The titanium nitride and copper thin films, diamond like coatings are deposited in an arc plasma flow. The polytetrafluoroethylene (PTFE) solid lubricants are precipitated from volatile products at electron-beam evaporation of a bulk material. The titanium nitride coating has 28 GPa hardness, diamond like coating - 65 GPa and good adhesion to a substrate.
The total thickness of such systems was about 1 mkm. The tribological characteristics were measured: wear rate, friction coefficient, friction path depth and morphology of coatings. Low friction coefficient (below 0.15) in combination with low wear rate was found for triple-layers coatings.
The application of multilayer vacuum coatings allows increasing the work resource of high-precision friction details in 2-5 times (for example, plungers of a diesel engine). The face hardening of the high-precision parts permits the work of fuel apparatus of a diesel engine even if diesel fuel contains abrasive particles and water.
The rubber with PTFE coatings have small friction coefficient, high working characteristics and heightened weak stability. The friction coefficient is reduced in 1,5 - 4 times, the wear-out of rubber and adhesion to a surface decrease considerably. The volumetric properties of rubber do not change. The increase of work resource has been established up to 10 times. |