摘要
以Al、Nb合金化MoSi_(2)为思路,采用激光合金化技术,在Cr12基体表面制备MoSi_(2)复合层,采用OM、SEM、EDS和XRD研究多元添加Al、Nb元素对MoSi_(2)复合层低温氧化性能的影响。结果表明,激光合金化MoSi_(2)合金层的组织形态,从表层依次呈现等轴晶、树枝晶、柱状晶和胞状晶。Al、Nb元素的添加,提高了MoSi_(2)合金层的抗氧化性能,24 d的550℃氧化过程中,合金层未出现粉化现象,氧化后的表层物相中无MoO_(3)相,合金层氧化增重主要是由Fe、Al发生氧化反应造成的,Al2O_(3)的保护作用及合金层的致密性有效抑制了MoSi_(2)低温“PEST”现象。
This study utilizes laser alloying technology to develop MoSi_(2)composite layers enhanced with Al and Nb elements on a Cr12 substrate.Utilizing OM,SEM,EDS,and XRD,the research investigates the influence of multi-component addition of Al and Nb elements on the low-temperature oxidation characteristics of MoSi_(2)composite layers.The resulting microstructure of the laser-alloyed MoSi_(2)layer reveals a sequence from the surface layer of equiaxed crystals,dendrites,columnar crystals,and cellular crystals.Incorporation of Al and Nb elements displays an enhancement in the oxidation resistance of the MoSi_(2)composite layer.Even after exposure to 550℃air for 24 days,the alloy layer shows no signs of decomposition into powder.The surface oxidation products lack MoO_(3)phase,and the weight increase in the oxidized layer is attributed to Fe and Al oxidation reactions.The protective mechanism of Al_(2)O_(3)and the compactness of the alloy layer effectively inhibit the low-temperature pesting of MoSi_(2).
作者
王洪金
孙顺平
李小平
潘强
商晨希
张扬
于赟
Wang Hongjin;Sun Shunping;Li Xiaoping;Pan Qiang;Shang Chenxi;Zhang Yang;Yu Yun(School of Materials Engineering,Jiangsu University of Technology,Changzhou 21300l,Jiangsu,China)
出处
《应用激光》
CSCD
北大核心
2023年第11期116-122,共7页
Applied Laser
基金
国家自然科学基金(52171003)
江苏省高校自然科学研究项目(17KJA430006)。
作者简介
王洪金(1984-),男,博士,讲师。研究方向为金属材料表面工程。E-mail:whj@jsut.edu.cn。
