Abstract：In this paper, diffusion silicide coating of the Si-Cr-Ti-W system was developed by use of slurry fusion process. According to analysis of composition and microstructure,coating consist of disilicicdes and silicon-base eutectic. And its microstructure is formed of outside protective film,main layer and inner layer at boundary of substrate and coating. The protective film stops the inward diffusion of oxygeon and the reaction with Si,resulting in a high Si content which serves to supply the SiO2 growth on coating surface. While the inner layer helps to release the internal stress in coating Experimental results of high temperature property show that service life exceeds 2.5 hours at 1800℃ when coating is exposed to oxidizing environments,and with 801-min cyclic oxidation life in air from 1800℃ to room temperature.
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