Bulk tungsten with uniformly dispersed La2O3 nanoparticles sintered from co-precipitated La2O3/W nanoparticles
Bulk tungsten with uniformly dispersed La2O3 nanoparticles sintered from co-precipitated La2O3/W nanoparticles
复制标题
DOI：
10.1016/j.jnucmat.2012.11.017
复制
发表时间：
2013-03
影响因子：
3.1
通讯作者：
Min Xia;Q. Yan;Lei Xu;Hongyan Guo;Lingxu Zhu;C. Ge
中科院分区：
文献类型：
--
作者：
Min Xia;Q. Yan;Lei Xu;Hongyan Guo;Lingxu Zhu;C. Ge
以偏钨酸铵（AMT）和硝酸镧为原料，采用共沉淀法制备了1wt% La2O3掺杂的La2O3/W纳米粒子。采用x射线衍射、场发射扫描电镜、透射电镜、能谱等对合成的纳米颗粒进行了表征。结果表明，合成的颗粒直径均匀，约为70nm，纯度高。透射电镜和快速傅里叶变换图像表明，la2o3析出物均匀地掺杂到纳米钨颗粒中。采用火花等离子烧结法制备的la2o3纳米颗粒，其电子背散射衍射图像显示，la2o3纳米颗粒均匀分布在钨晶和晶界中，显微硬度分布较窄。
We report the preparation of 1wt% La2O3doped La2O3/W nanoparticles by a co-precipitation process, using ammonium metatungstate (AMT) and lanthanum nitrate as raw materials. The as-synthesized nanoparticles were characterized by X-ray diffraction, Filed-emission scanning electron microscopy, Transmission electron microscopy (TEM), energy dispersive spectroscopy. Our results reveal that the as-synthesized particles possess uniform diameters of about 70nm, and are of high purity. The TEM and the corresponding fast Fourier transform images demonstrated that La2O3precipitates were homogeneously doped into the nano-sized tungsten particles. When the as-synthesized nanoparticles were sintered by spark plasma sintering, the electron backscatter diffraction images of the bulk material reveal that La2O3nanoparticles were homogenously distributed in both the tungsten grains and the grain boundaries, and the sample exhibit a narrow micro-hardness distribution.