摘要
采用高纯Mg粉与无定形B粉,按照MgB2化学计量比均匀混合后,在10MPa压力下压制成块,通过一系列微波烧结工艺制备了MgB2块材。探讨了微波烧结温度、保温时间对Mg-B二元反应体系的相组成、微观形貌、反应过程的影响。结果表明,微波烧结工艺700℃以上,10~30min内就能完成Mg-B体系的烧结反应,形成较高纯度的MgB2相。保温时间越长,烧结温度越高,MgO和MgB4杂相含量越高。显微结构分析表明,微波烧结能有效提高样品的致密度,样品内孔洞形状与初始Mg粉的形状和尺寸紧密相关。
MgB2 bulks are synthesized by microwave heating treatment in different conditions. The effects of temperature and heating preservation time on crystal phase, microstructure and reaction are discussed. The results show that the pure MgB2 phase can be synthesized in 10~30min by microwave heating treatment. The amount of MgO and MgB4 is increasing with the temperature and time rising. The result of microstructure analysis shows that the evaporation and oxidation of magnesium can be significantly reduced using microwave heating for the MgB2 synthesis, the shape and size of holes in MgB2 bulk is relative to the shape and size of Mg raw material.
出处
《材料导报》
EI
CAS
CSCD
北大核心
2007年第S2期88-90,94,共4页
Materials Reports
关键词
微波
Mg-B二元体系
烧结行为
microwave, Mg-B binary system, sintering performance