摘要
使用料浆熔烧工艺在 Ta- 10 W合金表面制备了 Si- Cr- Ti- W系统的硅化物涂层。分析认为 ,涂层由二硅化物和硅基共熔体组成。在结构上由外表面保护膜、主体层以及界面内层三部分构成。保护膜在高温下阻止氧向基体的浸渗 ,减少与硅的化学反应 ,使主体层保持较高的硅含量。内层有助于释放涂层积聚的内应力 ,保持良好的界面结合。高温性能测试结果表明 ,在 180 0℃高温下抗氧化寿命超过 2 .5 h,使该温度到室温的热循环达
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 80 1 min cyclic oxidation life in air from 1800℃ to room temperature
出处
《材料工程》
EI
CAS
CSCD
北大核心
2001年第10期3-4,38,共3页
Journal of Materials Engineering
