Based on the displacement function solution for plane issue in elastic mechanics, the common solutions of interface stress and displacement in multilayer coatings system are deduced by Fourier transformation, so that an effective and simple algorithm to calculate interface stress of coatings is obtained.

The behaviors of multilayer coatings including TiN film are introduced.

Compared with single layer ones, the third generation coatings, multicomponent and multilayer coatings, are found to have more excellent mechanic properties such as moderate residual stress, good adherence to the substrate, proper hardness to toughness ratio, low friction coefficient and wear rate, etc.

According to the theory of columnar/equiaxed transition (CET) in front of the solid/liquid interface, it was found that, in the single path multi-layer cladding layers and multi-path multi-layer cladding layers, the microstructure with the same crystal-lographic orientation as .

Preparation and characterization of polyurethane porous coating;

In order to modify the surface biologic characteristics of 316L stainless steel, based on the theory of phase inversion, we prepared PU compact and porous coatings in the help of water vapor.

Considered the liquid transverse suction effect at the porous layer interface,mathematical models was presented to investigate the influences of the porous layer charac-teristic parameters on condensation heat transfer.