Research On Preparation And Tribological Properties Of TIALCN/AGVN Adaptive Coatings

Temperature -adaptive coating material requires excellent lubricating property during whole temperature range. By means of plasma etching and filling technology, new structure TiAlCN/AgVN coatings were prepared and researched.TiAlCN coatings and AgVN coatings were deposited by radio frequency magnetron sputtering. The relationship between preparational parameters and structure were discussed in this paper. Lately TiAlCN/AgVN composite coatings were prepared to study their tribology properties. The results are list as following:The chemical compositions and properties of the TiAlCN films exhibited a strong dependence on the N2 flow rate. Even a low N2 flow rate led to notable precipitation of hcp-(AlTi)(CN) in fcc-(TiAl)CN matrix. Further increasing N2 flow rate made the hcp-(AlTi)(CN) as the dominant phase in the TiAlCN coatings. Moreover, the increasing N2 flow rate resulted in the precipitation of amorphous carbon in the matrix. Carbon content also had a significant effect on the tribological properties of TiAlCN coatings. When C content was higher, the friction coefficient would become lower. Superhard TiAlCN coatings were found in experiment.The refined of the nanocomposite crystalline structure and large amounts of grain boundarys were the main reason for high hardness.The structure of AgVN coatings was studied by changing the N2 flow and bias voltage. Results showed that the AgVN coating prepared by RF magnetron sputtering had grain-like structure; the coatings were composed of VN phase and Ag phase. Increase of N2 flow raised the Ag content in AgVN coatings while increase of Bias voltage significantly reduced Ag contents in AgVN coatings. AgVN coatings have better tribological performance in high temperature than that in room temperature.By means of plasma etching and filling technology, TiAlCN/AgVN coatings were prepared. Effects of fill depth on tribology properties were discussed. Experimental results showed that the composite coatings had basic adaptive lubrication ability in cycle between room temperature and high temperature (600℃).Half filled composite coatings had better lubricating property than the full filled one did, but less quantity of lubricant caused adaptive lubricating unable to continue for a long time.