Microstructure and properties of La2O3 doped W composites prepared by a wet chemical process
Microstructure and properties of La2O3 doped W composites prepared by a wet chemical process
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湿化学法制备La2O3掺杂W复合材料的微观结构与性能
DOI：
10.1016/j.ijrmhm.2017.04.004
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发表时间：
2017-08-01
影响因子：
3.6
通讯作者：
Wu, Yucheng
中科院分区：
文献类型：
--
作者：
Li, Jianfeng;Cheng, Jigui;Wu, Yucheng
La2O3/W composite powders were prepared by a wet chemical method,using ammonium metatungstate (AMT) and lanthanum oxides (La2O3) as raw materials. La2O3/W composite materials were obtained by sintering the powder compacts at 2200 degrees C. The La2O3/W composite powders were characterized by X-ray diffraction (XRD), Field emission scanning electron microscope (FESEM) coupled with energy dispersive spectrum (EDS) and microstructure of the La2O3/W composites was characterized by SEM and EDS. The results showed that the La2O3/W composite powders have polyhedral shape with particle size of 100-200 nm and some La2O3 particles were wrapped up by tungsten particles. The highest relative density of 96.93% was obtained for the composites containing 0.6 wt% La2O3. Maximum bending strength and Rockwell hardness reach 434 MPa and 70.3HRA, respectively, for the 0.6%La2O3/W composites. Scanning electron microscopy observations reveal that the La2O3-W core-shell structure still remains in the sintered La2O3/W composites.
