微量CeO2掺杂对钼合金性能的影响

Effect of Trace CeO 2 Doping on Mechanical Performance of Molybdenum Alloys

通过固-液喷雾掺杂技术和粉末冶金方法制备MoCe合金,采用ICP、SEM、万能试验机等手段测定合金粉化学成分、合金断裂特征和组织结构,研究不同含量稀土氧化物CeO2对钼合金性能的影响。结果表明,MoCe合金烧结密度随着CeO2掺杂量的增加而增加,且合金的密度均在9.80g/cm3以上。CeO2掺杂量少于0.3%时,烧结棒的晶粒尺寸随着CeO2掺杂量的增加而减小;CeO2掺杂量高于0.3%时,晶粒尺寸未发生明显变化。Φ1.8mmMoCe合金丝的室温强度和延伸率较纯钼丝有显著提高,CeO2掺杂量在0.3%时达到最大值,且室温拉伸断口呈现出典型的韧窝断口形貌。

MoCe alloys were prepared by solid-liquid spray doping technology and powder metallurgy method.ICP,SEM,universal testing machine and other means were used to determine the chemical composition of the alloy powder,the fracture characteristics and microstructure of the alloy,and to study the influence of different contents of rare earth oxide CeO 2 on the performance of molybdenum alloy.The results show that the sintering density of MoCe alloy increases with the increase of cerium oxide content,and the density of the alloy is all above 9.80 g/cm 3.When the doping amount of CeO 2 is less than 0.3%,the grain size of sintered rod decreases with the increase of CeO 2 content.When the doping amount of CeO 2 is higher than 0.3%,the grain size does not change significantly.Φ1.8 mm MoCe wire room temperature strength and elongation than pure molybdenum wire has increased significantly,peaked when CeO 2 content in 0.3%,and the tensile fracture at present a typical ductile fracture morphology.