The results showed that coating had typical layer shape,relatively high bonding strength and hardness,excellent high temperature erosion resistance because of the improvement on the erosion properties with the increase of temperature and angle.

Results show that in comparison with substrate,the coatings possess excellent high temperature erosion resistances,erosion resistance improved with the increasing of temperature and impact angle;they also possess good high temperature corrosion properties,corrosion rate raised a little with the rising of temperature;the coatings have excellent room temperature .

The high temperature erosion of utility boiler tubes (water wall,superheater,reheater and economizer tubes)by fly ash is recognized as being one main cause of utility boiler tube failures.

In this peper the authors investigated on prupose structures and properties of the nickel based alloy aplay welding layers, considering the serious actual situation of high temperature erosion of the pipes of economizers of eoal-fired power station,It has bee shown that there are the comple structures.

High-temperature erosion is one of the main failure phenomena in industry,which often occurred in both fluidized combustors and gas turbines that brings amounts of economy expense.

High temperature erosion wear was investigated about the nickd based alloy spray welding layers on a high temperature erosion wear testing device.

Nowadays,one economic and feasible way is using some kinds of thermal spraying and brush- ing to effectively protect boiler tubes from high temperature erosion wear with suitable coating materials,which make the use of boiler tubes longer.