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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。
Silicon carbide was treated on 0Cr18Ni9 stainless steel by molten salt electroless deposition. Experiments show that when the temperature reaches 800 ℃ for 8 h, the Fe3Si-type silicide layer enriched with Cr and Ni alloying elements is formed on the stainless steel substrate. The phase composition of the siliconized layer was analyzed by X-ray diffraction (XRD). The morphology and composition of the cross-section of the layer were studied by scanning electron microscopy (SEM) with an attached energy dispersive spectrometer (EDS). The cyclic oxidation behavior of silicon-on-silicon samples and 0Cr18Ni9 stainless steel at 800 ℃ was compared by the method of increasing oxidation mass. The results show that the increase of oxidation mass of stainless steel after siliconizing is obviously smaller than that of 0Cr18Ni9 stainless steel without silicidation. The reason for this is that during the cyclic oxidation, Si and Cr atoms rise from the matrix to the infiltration layer Diffusion, and in the outer and outer oxide produced segregation of SiO2, Cr2O3 and other oxidation products, which played a good protective effect on the substrate.