کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5457786 | 1515952 | 2017 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Microstructure and properties of La2O3 doped W composites prepared by a wet chemical process
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
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 °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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Refractory Metals and Hard Materials - Volume 66, August 2017, Pages 226-233
Journal: International Journal of Refractory Metals and Hard Materials - Volume 66, August 2017, Pages 226-233
نویسندگان
Jianfeng Li, Jigui Cheng, Bangzheng Wei, Minglong Zhang, Laima Luo, Yucheng Wu,