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AISI 304不锈钢表面Fe_3Si型硅化物渗层的制备及渗硅机理 被引量:4

Preparation and siliconizing mechanism of Fe_3Si type silicide layer deposited on AISI 304 stainless steel
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摘要 以n(NaCl):n(KCl):n(NaF)=2:2:1碱金属卤化物混合体系做载体,采用不同摩尔比的Na2SiF6和Si粉作渗硅剂,在800℃下利用熔融盐法分别对AISI 304不锈钢进行渗硅处理。采用X射线衍射仪(XRD)分析渗硅层的物相组成,用附带能量色散谱仪(EDS)附件的扫描电子显微镜(SEM)研究渗层截面的形貌和成分,分析熔盐法渗硅层的形成机理。结果表明:融盐中SiF62-的浓度决定渗层中Si元素的含量,由于SiO2在融盐体系中的溶解,融盐中SiF62-得到补充,渗层中Si元素的含量进一步提高。 The silicide layers deposited on the AISI 304 stainless steel were formed in the molten salts at 800 ℃ using the molten mixture of different mole ratios of Na2SiF6 to Si using the siliconizing agent and the molten halogenide of alkali metals of NaCI+KCI+NaF at mole ratio of 2:2:1 as the siliconizing agent carrier. In order to reveal the siliconizing mechanism in the molten salts, the phase of the silicide layer was analyzed by X-ray diffractometry. Meanwhile, the micrographs and the composition of the cross section of the silicide layer were studied by scanning electron microscopy (SEM) attached with energy dispersive X-ray spectrometer (EDS). The results show that the silicon content in the layer depends on the ion concentration of SiF62- in the molten salts. The dissolving of SiO2 in the molten salts supplies the SiF62- continuously and as a result, the silicon content in the layer is enhanced.
出处 《中国有色金属学报》 EI CAS CSCD 北大核心 2011年第12期3064-3070,共7页 The Chinese Journal of Nonferrous Metals
基金 国家自然科学基金资助项目(51001057)
关键词 AISI 304不锈钢 FE3SI 硅化物渗层 渗硅机理 渗硅体系 AISI 304 stainless steel Fe3Si silicide layer siliconizing mechanism siliconizing system
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