摘要
采用溶液燃烧合成技术制备了不同Y_(2)O_(3)含量(质量分数)的Fe-Y_(2)O_(3)纳米复合粉末,分析了Y_(2)O_(3)含量对制备的复合粉末的微观结构、晶粒尺寸、磁性能和烧结性能的影响。结果表明,制备的Fe-Y_(2)O_(3)纳米复合粉末均呈现由纳米颗粒组成的连通的网状结构,随着Y_(2)O_(3)含量的增加,晶粒尺寸逐渐降低。通过磁性能测试,不含Y_(2)O_(3)的纳米铁粉的饱和磁感应强度为1.97 T,相应的矫顽力为6.4 kA/m。随着Y_(2)O_(3)含量的增加,Fe-Y_(2)O_(3)纳米复合粉末的饱和磁感应强度逐渐降低,矫顽力逐渐增大。当Y_(2)O_(3)含量为2%时,Fe-Y_(2)O_(3)纳米复合粉末的饱和磁感应强度为1.45 T,相应的矫顽力为58.9 kA/m。对制备的纳米粉末进行常压烧结,当Y_(2)O_(3)含量低时,该粉末在较低的烧结温度(700℃)下可以获得较高的相对密度,当Y_(2)O_(3)含量增加到1%或2%时,在高的烧结温度(1300℃)下也难以实现致密化。
Iron-based metal/ceramic nanocomposite materials have attracted increasing attention owing to their outstanding mechanical,electrical,and magnetic properties with potential applications in many industrial fields.However,several technical routes,such as mechanical alloying,sol-gel,and electrodeposition,have limitations,including lengthy synthesis processes,complex experimental equipment,and expensive raw materials.In view of the urgent demand for high-quality iron-based metal/ceramic magnetic nanocomposites,Fe-Y_(2)O_(3) nanocomposite powders with different Y_(2)O_(3) contents(mass fraction)have been prepared using a combustion-based route.The effects of the Y_(2)O_(3) content on the microstructure,grain size,and magnetic and sintering properties of the nanocomposite powders were examined.The Fe-Y_(2)O_(3) nanocomposite powders exhibited a connected network structure composed of nanoparticles regardless of the Y_(2)O_(3) content,but the grain size decreased gradually with increasing Y_(2)O_(3) content.The magnetic performance test showed that the iron nanopowder without Y_(2)O_(3) had a saturation magnetic induction and coercivity(Hc)of 1.97 T and 6.4 kA/m,respectively.The saturation magnetic induction of the Fe-Y_(2)O_(3) nanocomposite powders decreased gradually with increasing Y_(2)O_(3) content,whereas the Hc increased.The saturation magnetic induction and Hc of the Fe-Y_(2)O_(3) nanocomposite were 1.45 T and 58.9 kA/m,respectively,at a Y_(2)O_(3) content of 2%.The as-synthesized Fe-Y_(2)O_(3) nanocomposite powders were densified by pressureless sintering.When the Y_(2)O_(3) content was low,the nanocomposites could reach a higher relative density at a lower sintering temperature of 700℃.In contrast,densification was difficult to achieve when the Y_(2)O_(3) content was increased to 1%or 2%even at a high sintering temperature of 1300℃.
作者
张德印
郝旭
贾宝瑞
吴昊阳
秦明礼
曲选辉
ZHANG Deyin;HAO Xu;JIA Baorui;WU Haoyang;QIN Mingli;QU Xuanhui(Institute for Advanced Materials and Technology,University of Science and Technology Beijing,Beijing 100083,China;Shunde Innovation School,University of Science and Technology Beijing,Foshan 528399,China;Beijing Advanced Innovation Center for Materials Genome Engineering,University of Science and Technology Beijing,Beijing 100083,China)
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2023年第6期757-766,共10页
Acta Metallurgica Sinica
基金
北京市自然科学基金项目No.2224104
广东省基础与应用基础研究基金项目No.2021A1515110202
