【作者】 张芳； 赵立杰； 彭军； 明守禄；

【Author】 Zhang Fang;Zhao Lijie;Peng Jun;Ming Shoulu;

【机构】 内蒙古科技大学材料与冶金学院；

【摘要】 为了充分发挥氧化铁皮含铁品位高、杂质元素含量低、产生量大的优势和特点,并开发高附加值的金属制品,本文采用还原烧结的方法制备了316多孔不锈钢。研究过程中采用高温真空管式炉还原烧结制备了多孔不锈钢试样;采用直读光谱、氧氢氮联合检测仪、XRD衍射分析仪、场发射SEM-EDS等设备对试样的化学成分、物相组成和微观形貌进行了检测。研究结果表明,以氧化铁皮为含铁原料,配入适量的石墨及合金粉末,在10^-3pa真空度、1200℃下保温3h可以制备出316多孔不锈钢,在此条件下Mn合金粉末的收率最低,为61%;制备出的不锈钢试样的组织为单一奥氏体,少数局部位置存在铬元素不均匀的情况;同时在晶内有CrC析出,晶界附近存在σ相;本论文制备的316多孔不锈钢在加入造孔剂之前的孔隙率为37.6%,每增加10%质量比的碳酸氢铵,试样的孔隙率增加9.3%。更多还原

【Abstract】 In order to give full play to the advantages and characteristics of iron scale with high iron grade,low impuritycontent and large production,and develop high added value metal products,316 porous stainless steel was prepared by reduction sintering in our work.The porous stainless steel samples were prepared in high temperature vacuum tube furnace.The chemical compositions,phase compositions and microstructure of the samples were detected by direct reading spectroscopy,O-H-N combined detector,XRD diffraction analyzer and field emission SEM-EDS.The results show that 316 porous stainless steel can be prepared by adding appropriate graphite and alloy powder with iron oxide as raw material at 10^-3Pa vacuum and 1200℃ for 3 h.Under this condition,the yield of Mn alloy powder is the lowest,which is 61%.The microstructure of the prepared stainless steel sample is single austenite,and chromium element is not uniform in a few of positions.CrC precipitates austenite in the grain and σ phase exists near the grain boundary.The porosity of 316 porous stainless steel prepared in this paper is 37.6% before adding pore-forming agent,and the porosity of the sample increases by9.3% with an increase of 10% mass ratio of ammonium bicarbonate.更多还原