کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1463561 | 989648 | 2012 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: A study of the oxidation of ZrB2 powders during high-energy ball-milling in air A study of the oxidation of ZrB2 powders during high-energy ball-milling in air](/preview/png/1463561.png)
Oxide impurities in ZrB2 powders promote coarsening, resulting in lower sinterability. Given its importance for sintering, we studied the oxidation of ZrB2 powders during high-energy ball-milling (the form of milling able to refine ZrB2 powders to the nanoscale) with the aid of various characterization techniques, namely fusion in inert gas, X-ray diffractometry, helium pycnometry, transmission electron microscopy, and Fourier-transform infrared, Raman, and X-ray photoemission spectroscopy. It was found that high-energy ball-milling in air introduces twice as much oxygen into the ZrB2 powders as the more conventional attrition milling. Also, this oxygen does not form solid-solutions with ZrB2, but amorphous oxides (i.e., ZrO2 and B2O3) that locate preferentially on the surface of the ultra-fine agglomerates resulting from cold-welding of the primary nano-particles that form during the ball-milling.
Journal: Ceramics International - Volume 38, Issue 4, May 2012, Pages 2857–2863