0Cr18Ni9不锈钢表面渗Si层制备及抗氧化性能研究  

Preparation and oxidation resistance of siliconized layer deposited on 0Cr18Ni9 stainless steel

作　　者：李鹏[1] 贾建刚[1,2] 马勤[1,2] 安亮[1] 郭铁明[1,2] 季根顺[1,2] 

机构地区：[1]兰州理工大学甘肃省有色金属新材料省部共建国家重点实验室,甘肃兰州730050 [2]兰州理工大学有色金属合金省部共建教育部重点实验室,甘肃兰州730050

出　　处：《金属热处理》2011年第5期54-57,共4页Heat Treatment of Metals

基　　金：青年科学基金项目(51001057);兰州理工大学博士科研启动基金资助项目(BS01200908)

摘　　要：通过熔盐非电解沉积法在0Cr18Ni9不锈钢表面进行渗硅处理。试验表明,当温度达到800℃渗硅时间为10 h时,在不锈钢基体上产生约500μm的富含Cr、Ni合金元素的Fe3Si型硅化物渗层。采用X射线衍射仪(XRD)分析了渗硅层的物相组成,用附带能量色散谱仪(EDS)附件的扫描电子显微镜(SEM)研究了渗层截面的形貌和成分。通过氧化质量增加的方法,比较了渗硅试样和0Cr18Ni9不锈钢在800℃下的循环氧化行为。结果表明,经过渗硅处理后不锈钢的氧化质量增加明显小于不经过硅化处理的0Cr18Ni9不锈钢的氧化质量增加,其原因是在循环氧化的时,发生了Si、Cr原子从基体到渗层的上坡扩散,并且在内外氧化层中产生了偏聚的SiO2、Cr2O3等氧化产物,从而对基体起到很好的保护作用。Fe3Si composite coating was prepared with a thickness of about 500 μm on 0Cr18Ni9 stainless steel at 800 ℃ for 10 h in the molten salt consisting of NaCl,KCl,Na2SiF6 and Si powder.The phase of the siliconized layer was analyzed by X ray diffraction.The micrographs and composition of the siliconized layer in cross section were studied by scanning electron microscope attached with energy dispersive X-ray spectrometer（EDS）.Compared with the bare 0Cr18Ni9 stainless steel,the siliconized coating exhibits an excellent oxidation resistance.The composite oxide film containing SiO2 and Cr2O3 results from the uphill diffusion of Cr and Si at 800 ℃ in the interface between the substrate and the coating,and the presence of SiO2 and Cr2O3 in the coating surface accounts for the excellent high temperature oxidation resistance.

关 键 词：FE3SI 氧化 渗硅层 

分 类 号：TG178[金属学及工艺—金属表面处理]