氧化铝陶瓷内衬不锈钢复合钢管的组织与性能

STRUCTURE AND PROPERTIES OF STAINLESS STEEL PIPE WITH ALUMINA CERAMICS LINING

用自蔓延铝热－重力分离法制备了氧化铝陶瓷内衬不锈钢复合钢管．测定了复合钢管的机械性能，并用金相显微镜、扫描电子显微镜、Ｘ射线衍射分析仪分析了复合钢管的组织结构．试验结果表明：外层钢管与内衬陶瓷间因形成ＦｅＯ·Ｃｒ２Ｏ３尖晶石相而产生反应润湿，陶瓷层由隐针状内层、柱状中间层和外层树枝晶组成．由于陶瓷与钢管结合模式的改变，复合钢管的压剪强度由普通碳钢复合管的１５．４ＭＰａ提高到不锈钢复合管的２６．５ＭＰａ．

The stainless steel pipe with alumina ceramics lining is manufactured by the SHS gravitational-thermit process. The microstructure of the composite pipe is investigated by the optical microscope, SEM and XRD. Meanwhile, the compression shear strength and compressive strength of the composite pipe are measured. The results show that formation of FeO·Cr 2O 3 induces wetting in reaction between the liquid ceramics and outer stainless steel pipe. The ceramics structure can be divided into three zones, i.e. pin microlite, columnar and dendritic zone. The compression shear strength of the stainless steel pipe with ceramics lining is about 26.5 MPa, much higher than 15.4 MPa of the carbon steel based composite pipe.